4l80e Shifts Hard No Overdrive

I have an 2003 F-150 4. Replacement of all worn or damaged hubs; 100% new Friction Linings; 100% new Bearings; All Pistons machined to exceed factory trueness specs; Outer Diameter trimmed to assist with better balance and function; HD and HP. There is no engine braking in any gear if the transmission shift lever is in 4th, regardless of the shift solenoid operation. We are using the stock gear selector sensor which we adapted to work with the 4L80E (see the pics above on this). Simply find an original or reproduction-style adapter and everything bolts up. I have a 99 f250 PSD 4x4 and have recently got my transmission rebuilt. They have an unusual shift pattern. I have a weird feeling that my overdrive might have something to do with this. Wont hold in 2nd gear. 7 Crew Cab truck with 63,000 miles. I have both laying on the floor of my shop. 3 engine and a 4L60E trans, it has been rebuilt 1 month ago and still shifts hard from 1st to 2nd only, other gears shift. 56s and stock tires with your 4L60E). Lead plaintiffs, all GM owners, allege in their class action lawsuit that the 8L90 and 8L45 transmissions are defective, causing drivers to not only experience the “hard shift” but also engine damage. I use Art Carr's Super rebuild kit and Mike Kurtz/Art Carr shift kits. Page 2- 4l80e shifting ? LSx Swaps. Inconsistent shift feel, Shift solenoid filter blow-out, and Premature unit failure A complete pressure regulator valve train is supplied in the 4L80-E kit. A TH400 with Gear Vendor overdrive. Nothing changes with the tps plugged in or unplugged. Thanks for the help!. Nov 27, 2002 · the trans gear ratios are. Despite shifts in DOT policy, safety ratings for owner-ops still hard to come by in 2020. When i have the overdrive off it just allows it to stay in 3 and im fine just running at high rs at 70 mph. In 2001 GM introduced a 6. 6L with a 4R70W transmission, the speedometer goes crazy while I drive, the truck feels like it kicks in & out of overdrive, it shifts hard, the o/d light flashes while driving and I cannot use speed control. A cheap and easy fix if your 4L60E automatic trans is shifting hard or shifting late. It stalls and downshifts. I am at a loss. 265 75 16 tires about a 31 inch tire Just got the truck about two weeks ago, when first started up from cold as long as i dont get on the gas too much i can go forever without hard shifts as long as i dont stay in OD too long. Removed and refreshed motor and replaced engine cradle. The 4L80E has a lot more potential for power capacity as well as better … The transmission was redesigned internally and given a 5-pinion planetary set for both front. 73 REAR GEAR AT 126 MPH IN THE LIGHTS TO KEEP THE RPMS IN 3RD GEAR AT about MAX hp (6000rpm) and still have a 75mph 2490rpm cruise with the 700r4 trans in overdrive, when I swap to the 4L80E. It offers a fourth gear overdrive to increase fuel efficiency. Nothing so far. 7 liter gas engine or the 6. For a couple weeks it worked fine and then it felt like it was having trouble getting into overdrive and the overdrive button on the column stopped working but it would still shift into overdrive. The truck is a 1991 3500 6. The Turbo 400 is still regarded as one of the greatest transmissions ever developed, and even nearly half a century after its initial release, GM is still building the 4L85-E, a com­puter-controlled overdrive version of this transmission. >New crossmember, readily available from the parts stores >Drive shaft will need to be shortened and rebalanced. Since both mechanical and electrical components can be involved in the operation of shift solenoids, there are many different factors that can lead. When I bought it a week ago it would go into both when the trans got to 175 then it would go out. Ian, You should first look into the simple adjustment of the TV cable. When going from 3rd to overdrive, the tach would rev up to around 4500 rpms and then it would drop into overdrive. 5 with a 4L80E that has started having extremely hard shifts and won't shift into overdrive. I'm building one with a TCI manual shift trans brake, 5 pin planets, TCS and ALTO HD internal parts, and using a TCS 10" with lockup convertor in high gear. dieselbombers. For example, during the first gear, the 4l60e has a gear ratio of 3. This product has been designed, engineered and tested to meet the highest. Although some people like the B&M shift kit, I personally don't like using the spacers for the accumulators. It fits in the tunnel with no issues or modifications. They have an unusual shift pattern. Electrically controlled transmissions generally have a built-in safety program that prevents the transmission parts from breaking based on a rolling speed shift reference during the reverse engagement. Part throttle goes up & down through the gears with no issues, including OD & TCC lock and unlock. While in drive at 35mph or so, if you stomp it (not necessarily to the floor) it will shift into overdrive, however, if you lift off the accelerator or the truck levels out based on where you have the accelerator, it immediately drops back down into drive even if you are going 65mph. I had a code 22. The truck has enough grunt to pull just about anything, but I am worried about using 4th when towing my rig to Moab this year. my fluid is clean, no burn smell i drove home from the desert and the tranny was shifting perfectly fine ( this was on a saturday). Whether you need 4L80E wiring diagram information, 4L80E transmission rebuilders tips, 4L80E technical information, 4L80E diagnostics, 4L80E troubleshooting help, or just answers to your 4L80E transmission rebuilders question, the Transmission Rebuilders Network is the place to go!. If you'd prefer a manual, then the Jerico 4-speed is the best bet. 2) (same one as shown in Fig. The 4L80E transmission is 4 inches longer than the TH400. My dad's truck is a 1993 GMC 3500 non dually 4wd and is powered by a none ECU 6. The 4L80E transmission in my 1992 Chevy Suburban 2500, 4x4, 7. Nothing so far. Once I back off it will go ahead & shift. It is their Shock Wave system, air bag at all 4 corners. Vacuum testing is an efficient way to identify the root cause of transmission problems and evaluate the effectiveness of repairs. Circle D can do this no problem. This TransGo 4L80E SHIFT KIT® Valve Body Repair Kit fits 1991 to 2013 General Motors vehicles equipped with the 4L80E and 4L85E automatic transmission. ) 63B Overdrive Direct Drum Eliminates the possibility of 1-2 shift shutter. Some simply adjust to the ignominy of life without overdrive, while others bolt on a Gear Vendors assembly to the tailshaft. In some cases Pressure is increased to clamp down tighter to help eliminate a perceived slip. Opening the Hone Manufacturing Company in Santa Fe Springs, California, Fred designed and built this self-contained, fully lubricated, 2-speed synchromesh planetary transmission that is manually shifted from 1:1 Direct Drive to a 1. In 2001 GM introduced a 6. Column Shift Linkage Installation Instructions for GM TH350, TH400, 700-R4, TH200, 200-4R, 4L60, 4L60E, 4L80E, and 6L80E/6L90E 1/4"-20 x 7/8" Socket Head Bolt (same one as shown in Fig. Frequent, proper vacuum testing can put money in the bank, improve turnaround time in your bays, and prevent costly comebacks. 4L80E Hard Shifting Jan 25 2012, 5:52am Hi, I have a 1992 silverado with a 4L80E trans. i changed the fluid and filter and the electric solenoids that regulate the shifting. It shifts hard particularly between 2 & 3 and mainly when first starting cold. Dime a dozen in the states but rare as rocking horse shit here. When going from 3rd to overdrive, the tach would rev up to around 4500 rpms and then it would drop into overdrive. A problem with one or more of the solenoids can cause a lack of pressure, resulting in hard, soft or delayed shifts. there is also an unusual amount of free play in the steering at a neutral position. 4L80E 4L85E Shift Kits. It slipped at around 40k and at around 80K as I was getting up to speed and the gears needed to shift. This product has been designed, engineered and tested to meet the highest. All of a sudden it quit shifting into overdrive. THe other day my overdrive light started blinking,well I just kicked the truck in nutral while driving and shut it off and restarted it and the light quit. Install in 15 minutes. No code setting while 1-2 or 2-3, it only repeatedly did it once settled in and cruising along. While the 3. I already have a Novak adapter for a GM automatic, so a 4L60/65/70/80E swap would be an interesting choice. today the transmission made a loud pop. 1st-2nd shifts late, 2nd-3rd shifts early, WOT shifts right at 3000 rpm every time. Find many great new & used options and get the best deals for 5R110W Transmission Shift Solenoid BB Set TCC-Intermediate-Overdrive-Low/Reverse at the best online prices at eBay! Free shipping for many products!. 0 LQ9 2004 4L80E. The 4L80E and its 4L85E derivative (the 4L85E was designed for vehicles up to 16,500 lbs. A lowered stance is also in part to 2 inch drop spindles and the frame is dropped 3 inches in the center. 265 75 16 tires about a 31 inch tire Just got the truck about two weeks ago, when first started up from cold as long as i dont get on the gas too much i can go forever without hard shifts as long as i dont stay in OD too long. 4th gear on the forester -is- overdrive. thanks for any info. From a strength and performance perspective, the 4L80E is definitely a player. gm 4l80e gear ratios, Apr 17, 2015 · It fea­tured gear ratios of 2. It will not shift into overdrive until you get over 2500 rpm and you still have to let off the gas to make it go into overdrive. So the transmission pops it down a gear to increase torque while on the incline, then shifts back up when I level out. This transmission is basically a TH400 with overdrive. This is normal. Hey MI GREEN ,lock up is not overdrive, 4th is overdrive, the 4th clutch is the only element that is exclusively used in 4th on a 4L80E meaning no other range uses the 4th clutch other than OD. It comes with an awesome computer that you can modify every single aspect of the transmission, from shifting so hard it makes your teeth rattle to so soft your not sure it even shifted. This write-up is for OPERATION OF THE 4L80E TRANSMISSION. Some of the features are: Full manual shifts – the transmission will be in the gear you select and changes to any gear you choose when you move the selector, no computer or wiring needed, Red Eagle clutches, Carbon fiber ba nd, RedEagle PowerPacks for the forward. In 2001 GM introduced a 6. Comes with instructions. The shifts are all extremely hard (BANG) regardless of throttle opening, which means wet weather driving is extremely dangerous, backing off does nothing. The transmission, 4L80E, will not shift out of first, abs light is on, no speedometer, no heat or a/c, all at the same time, then all went back to normal with gerky trans shifting, then all went to ma. there is also an unusual amount of free play in the steering at a neutral position. 93 4L80E hard shifts/no overdrive. 1-What controls the shifts in a 4L60E 4L80E and can I replace the PCM with a vacuum modulator. This shifter assembly will control the up shifts and down shifts on the Pace Performance 6L80e or 6L90e transmission package. • Increased fuel economy through use of lock up torque converter. Here's the weird part. All of a sudden it quit shifting into overdrive. The Turbo 400 is still regarded as one of the greatest transmissions ever developed, and even nearly half a century after its initial release, GM is still building the 4L85-E, a com­puter-controlled overdrive version of this transmission. 5L- (F-code, HO) TD with a 4L80E auto and 4. 140,000 miles I bought this truck with the hard shifting present. And then the next time I had problems with it it was with it not wanting to shift to overdrive (i. SOLUTION: Tapered plug in SK® Kit prevents actuator pressure loss. TransGo even has kits for computer-controlled, 4-speed automatics. it shifts nice and hard. this is a computer. ) 63B Overdrive Direct Drum Eliminates the possibility of 1-2 shift shutter. Well last night,I was coming home,and the overdrive light. If the engine is pretty stout it will need some upgrades. 3-4 signal oil is supplied to the 3-4 shift valve. id have the dealer double check for hard codes. The easiest overdrive trans to swap in would be a 2004R. Splitting the circuits electrically is a very basic step in the "No Reverse" shift concern diagnosis. It is a common practice to block off or disable the accumulators to improve shift feel. It got pretty bad, almost choking, though it did keep on going. Dec 13, 2007 #1 I have a 93 GMC Sierra 6. The 4L80E is a much larger trans­mission with stronger internal com­ponents. 075 overdrive 4L80E matched with its 4. Your truck is not shifting into overdrive. Elsewhere in this story we’ve listed the ratios of both the TH350 and the 700R4/4L60E. GEO tracker transmission problems – Maybe your 4l80e has some of the same issues as a Geo. It was via the tenacity of serious racers we learned how to live with the AOD. com The most ridiculous Overdrive questions - Diesel Place : Chevrole. Whether you are trying to move a couple tons up a steep incline or moving just a couple thousand down the track — the fastest way is with the right gearing. Page 2- 4l80e shifting ? LSx Swaps. 73 REAR GEAR AT 126 MPH IN THE LIGHTS TO KEEP THE RPMS IN 3RD GEAR AT about MAX hp (6000rpm) and still have a 75mph 2490rpm cruise with the 700r4 trans in overdrive, when I swap to the 4L80E. 09/16/2007 1:26 PM: You’ve hit on a few good points here. - In order for the transmission to shift correctly, a conversion harness must be. To keep this from happening to your remanufactured 4L80E transmission, Street Smart Transmission recommends installing an auxiliary transmission cooler. 8 to advertisers enabling them to display relevant advertising. Call (775) 432-0545 for more information. It is a 4X4 4. No code setting while 1-2 or 2-3, it only repeatedly did it once settled in and cruising along. The accumulators are used to help control shift performance by increasing the amount of time required to completely apply the clutch packs, or servo, that applies the band. We are using the stock gear selector sensor which we adapted to work with the 4L80E (see the pics above on this). 06 lbz “shift range inhibited” won’t move foward, no codes. A Complete System Correction and Recalibration Kit improve pressure control and shift quality. Other than that the transmission shifts flawlessly when it does not happen to kick out of overdrive. Performance Built MT1 4L80E Automatic Transmission and Torque Converter. RE: Shifting problem IP: Logged Message: Well, I can only say that I had many of the problems listed above with my 98 auto 6 cyl. No it is completely gone. Well, I figured out that it wasn't shifting into overdrive. 0L LS engine and felt the 4L60E as designed could not withstand the torque & horsepower of that engine. I had an issue when I bought mine new with the goofy 1-2 shift, typically after it downshifts and the wants to go back to 2nd it would kind of lag and rev up and shift hard into 2nd. This shifter assembly will control the up shifts and down shifts on the Pace Performance 6L80e or 6L90e transmission package. 8 to advertisers enabling them to display relevant advertising. It drove very normally again for a few miles then drop out of overdrive again. I have a 2000 chevy crewcab 4x4 3/4 ton old body style. 265 75 16 tires about a 31 inch tire Just got the truck about two weeks ago, when first started up from cold as long as i dont get on the gas too much i can go forever without hard shifts as long as i dont stay in OD too long. 7L with a 4L80E RWD. The truck is a 1991 3500 6. I can set the shift points and the shift aggressiveness using the TCI hand held. See also: Troubleshooting Common Problems in the Yukon 4L80E Transmission. Nov 27, 2002 · the trans gear ratios are. Thanks for the help!. Dave from Ghetto Van Adventures gives you a cheap and easy solution to look at if your vehicle is shifting hard and you have no overdrive. 5 with a 4L80E that has started having extremely hard shifts and won't shift into overdrive. Correct me if I'm wrong, but imho the 4L60E would be plenty strong for a Z. So - it's had a long life, I use it for going to hardware, dump, nursery, etc. Plus you get that ever important extra gear. Nothing so far. I made another video. I was reading that if I install a trans go shift kit that it would probably take care of the problem. The 4L80E has a lot more potential for power capacity as well as better … The transmission was redesigned internally and given a 5-pinion planetary set for both front. Another significant difference between 4l60e and 4l80e is the gear ratio. 3 engine and a 4L60E trans, it has been rebuilt 1 month ago and still shifts hard from 1st to 2nd only, other gears shift. For instance, if the shift lever is in third gear, it feeds a circuit that prevents overdrive from engaging. Re: 4L80e drops out of overdrive. Install this lower piece and the starter if you’ve already installed the converter bolts. I have found. That is to say when they are moving at a. Drivetrain warehouse supplying quality professional automotive and truck automatic transmission hard parts front pumps, drums planetarys discounted for both foreign and domestic vehicles. This shifter assembly will control the up shifts and down shifts on the Pace Performance 6L80e or 6L90e transmission package. It's all held by the pump bushings and the tailshaft bushings. Because land one is. For the car crowd, a quality transmission needs to shift hard, hold big power, and take a beating run after run. 70 so max performance shows I NEED A 3. Truck info: 2000 Sierra 2500 4X4 4l80E and 4. We can still ratchet shift from manual 1st to 3rd, but no higher. I had a code 22. Just with these numbers, you can probably calculate that there is a big difference in size and weight between these transmissions. The 4L80E transmission has some quirks and over the years has had several updates, the reason your 4L80E started shifting hard was because it was sensing slippage. It provides Park, Reverse, Neutral, and four forward speeds with 4th gear being overdrive. A Complete System Correction and Recalibration Kit improve pressure control and shift quality. 1 L Avalanche, the Tahoe, and the Hummer. It acts like it's one gear off from what the shift indicator says it is. It may be (but is less likely) that the sun shell went bad as well. As the 4L60E ages, one of the most common problems that it develops is that it won’t shift into overdrive anymore. OPTIONS CONTROL SERVICE SHIFT EATON FULLER TRANSMISSIONS L H D N R Go to Step B. GVWR and with engines up to 460 ft. Ive read that the VSS in the rear diff sometimes goes out so I replaced that and nothing (its the same). When any one of these two shift solenoids fail, the PCM commands the transmission to operate in LIMP IN MODE and this means that the transmission will run in 2nd gear only (no 1st and no 3rd or 4th). Performance Built MT1 4L80E Automatic Transmission and Torque Converter. When I turn off the overdrive and start off it still shifts hard but it seems to go a little bit better. When I did shift down to 3 you could feel it downshift. Home; About Us; Services; Blog; Contact Us; FAQ; Portfolio; Gallery. In 2001 GM introduced a 6. I'm hoping to get some help with problem #1 I put. Accelerating slowly from a stop it shifts fine. The answer is the PCM is in complete control of every aspect of when and how the 4L60E shifts, Line Pressure and Lockup. 73 REAR GEAR AT 126 MPH IN THE LIGHTS TO KEEP THE RPMS IN 3RD GEAR AT about MAX hp (6000rpm) and still have a 75mph 2490rpm cruise with the 700r4 trans in overdrive, when I swap to the 4L80E. 70 so max performance shows I NEED A 3. Common complaints on this transmission soft 2-3, no upshifts, burnt direct clutch, broken hard parts due to high pressure, low pressure due to solenoid filter breakup as well as gear ratio and. We have the most complete inventory of performance transmission parts for Ford, GM and Dodge than you'll find anywhere else. K3500 sierra. I've read that some of the numbers in the tables have to be changed or "zero'd" when running a shift kitso I'll have to look in to that morebut right now I need to find someone that can do a tune, or someone that knows whats going on more that what I do(which isn't much) to fix my problemsfirst gear shifts way too early, overdrive shifts late. It will not shift into overdrive until you get over 2500 rpm and you still have to let off the gas to make it go into overdrive. 1 L Avalanche, the Tahoe, and the Hummer. 3 engine and a 4L60E trans, it has been rebuilt 1 month ago and still shifts hard from 1st to 2nd only, other gears shift. 47:1, depending on which. Average failure mileage is 128,900 miles. Very hard to find 1991 GMC 1 ton, crew-cab dually 4x4, with Top-of-the-line SLE trim. With a few improvements in hard parts and friction materials, and the 4L70E can easily stand up to the type of power that today’s engines are capable of producing along with maintaining the benefits of overdrive and electronic shift control. 70 so max performance shows I NEED A 3. A cheap and easy fix if your 4L60E automatic trans is shifting hard or shifting late. Everything seems to run and shift ok except it doesn't shift into overdrive after being driven for a while. gm 4l80e gear ratios, Apr 17, 2015 · It fea­tured gear ratios of 2. 73 REAR GEAR AT 126 MPH IN THE LIGHTS TO KEEP THE RPMS IN 3RD GEAR AT about MAX hp (6000rpm) and still have a 75mph 2490rpm cruise with the 700r4 trans in overdrive, when I swap to the 4L80E. 75:1 overdrive. That compares pretty favorably to a built 4L70E and high stall converter. A problem with one or more of the solenoids can cause a lack of pressure, resulting in hard, soft or delayed shifts. Today, you can find the crew hard at work building over 300 performance C4 transmissions each year. Buy It Now +C $30. I just purchased the vehicle a couple months ago. Codes can be cleared by. 4l80e fluid capacity. As the 4L60E ages, one of the most common problems that it develops is that it won’t shift into overdrive anymore. For this "No Reverse" shift issue we are going to mechanically split the circuits by blocking the Low/Reverse band. A 4L80E is essentially a TH400 with overdrive, so in 1st through 3rd gears you have the same strength and function with either setup. FYI - 4L60E & 4L80E transmissions are NOT directly interchangeable. With a few improvements in hard parts and friction materials, and the 4L70E can easily stand up to the type of power that today’s engines are capable of producing along with maintaining the benefits of overdrive and electronic shift control. Shop restoration car parts and accessories at Classic Chevy. The shift valve determines when to shift from one gear to the next. Driving without problems for 8 years a 3500 K dually 6. While its not in overdrive, it only has 3 transmission gear shifts, no matter how fast it stays in 3rd (I went all the way to 60mph and stopped there). Nothing so far. Since both mechanical and electrical components can be involved in the operation of shift solenoids, there are many different factors that can lead. Imbalance of torque converter clutch apply oil through the front stator support bushing contributes to this complaint. I changed the transmission filter and fluid and seemed to have fixed the stalling problem. 5″, while the 4L80e has a weight of 236 lbs and a length of 26. Also we have a full line of new, rebuilt and good used quality hard parts available. This product has been designed, engineered and tested to meet the highest. There's a whole article on this site dedicated to diagnosing no reverse in the 4L60E. Transmission Not Locking in Overdrive– The 4L60E and 4L80E both have torque converters that lock. Well last night,I was coming home,and the overdrive light. Overdrive editors and ATBS present the industry’s best manual for prospective and committed owner. TSB 08-07-30-016 – Slipping, refusal to shift, overheating Chevrolet Silverado 2500 HD 4L80E. TCI trans 4L80E. I just drove it for about 50 miles and the hard shifting (like a jump) has gon … read more. While driving down the road at a speed of 70 to 75, I can shift it into drive and let off the accelerator, put back into od and it will shift into od, but as soon as I. This product has been designed, engineered and tested to meet the highest. Phone: 0800 658 899 (64) 9 636 7832 Fax: (64) 9 634 5631. Installation is a matter of connecting a power, ground, ignition on, and a handful of other wires and connectors. is the tranny fried or could it be a linkage of some sort. Fluid is clean, no metal shavings, no burnt appearance or smell. The ultimate set-up is already well known. 70 so max performance shows I NEED A 3. My 4l80e hauls, hauls ass! :lol: It was easy and cheaper than the 60e. in a 3/4ton truck i have seen them shift from 1st to 2nd in the 60mph range with 4. • Increased fuel economy through optimized shift points. Codes can be cleared by. Shifting solenoids do pertain to issues with no engagement in Overdrive. So far, I've determined that its not a major internal hard part failure. I made another video. I'm hoping to get some help with problem #1 I put. With a few improvements in hard parts and friction materials, and the 4L70E can easily stand up to the type of power that today’s engines are capable of producing along with maintaining the benefits of overdrive and electronic shift control. Home; Health ; Education ; For Pets ; Videos ; About. No engine lights or anything though. It shifts hard particularly between 2 & 3 and mainly when first starting cold. Rebuild kits/Shift kits. THe other day my overdrive light started blinking,well I just kicked the truck in nutral while driving and shut it off and restarted it and the light quit. Once I back off it will go ahead & shift. In 2001 GM introduced a 6. The Turbo 400 is still regarded as one of the greatest transmissions ever developed, and even nearly half a century after its initial release, GM is still building the 4L85-E, a com­puter-controlled overdrive version of this transmission. You can make your HP tuners work by setting the 1-2 shifts to 0 mph. THe 4L60E is the electronic version of the 700R4. 0L LS engine and felt the 4L60E as designed could not withstand the torque & horsepower of that engine. Auckland: 275A Neilson Street, Onehunga P. History has proven that the swap in question is an endeavor that’s very common, yet rarely executed. the trans only has around 35k miles on it but lately it seems like it shifts as though it has a shift kit. I think it was a replacement of the main connector and attaching wires. It provides Park, Reverse, Neutral, and four forward speeds with 4th gear being overdrive. If anyone can help let me know, thanks. The strength argument doesn't make sense. Although not the most common it is very well worth mentioning. 4L80E Hard Shifting Jan 25 2012, 5:52am Hi, I have a 1992 silverado with a 4L80E trans. Imbalance of torque converter clutch apply oil through the front stator support bushing contributes to this complaint. 7L with a 4L80E RWD. This item: 4L80E 1-2 A Shift Solenoid and 2-3 B Shift Solenoid Set 1991 and up GM $24. The truck is a 1991 3500 6. When going from 3rd to overdrive, the tach would rev up to around 4500 rpms and then it would drop into overdrive. 70 so max performance shows I NEED A 3. Transmission Not Locking in Overdrive– The 4L60E and 4L80E both have torque converters that lock. 4L80E 4L85E Shift Kits. It shifts hard particularly between 2 & 3 and mainly when first starting cold. Truck has 190k miles on it w/o any rebuilds. There's a whole article on this site dedicated to diagnosing no reverse in the 4L60E. Had the same issue with my wrecker several years ago and the tranny shop got a fix (after a lot of tinkering/troubleshooting) by repairing/replacing wiring in the main harness to the tranny. 490" wide) image #037, 040 Item #34037 $2. Everything is working perfectly and shifts just like it should. Also, the way these components are designed, when certain clutches are applied they impart a spreading force between the front and rear of the transmission. In 2001 GM introduced a 6. The car shows that it's shifting from 1 to 2 to 3 to 4th, but it isn't, it just stays in 1st. The 700 has a bad reputation but many problems are the result of bad TV cable adjustments. 3 engine and a 4L60E trans, it has been rebuilt 1 month ago and still shifts hard from 1st to 2nd only, other gears shift. If I'm at 55mph it stays locked. 7 liter gas engine or the 6. I am considering changing my transmission and. I'm having shifting problems during hard acceleration from a start and when tring to accelerate when already at a speed when the transmission downshifts. 0L LS engine and felt the 4L60E as designed could not withstand the torque & horsepower of that engine. I had an issue when I bought mine new with the goofy 1-2 shift, typically after it downshifts and the wants to go back to 2nd it would kind of lag and rev up and shift hard into 2nd. It is their Shock Wave system, air bag at all 4 corners. They claimed. Thinking a 350/400 hp V8 with the. I had a local shop do the install along with a MSD delete. drove to my buddys, everything fine, left and truck ran up to about 3k, shifted finally very hard, my speedo aint working, abs lights on, and overdrive button is flashing, hooked code reader up, no codes, tried hooking to when truck was running, it killed it the first time, almost killed it the. I have a cuple problems My 1993 Chevy k2500, 6. The easiest overdrive trans to swap in would be a 2004R. See full list on chevroletforum. Known as delayed engagement, it is one of the most common symptoms of problems with any automatic transmission. Everything seems to run and shift ok except it doesn't shift into overdrive after being driven for a while. 646 gauge ). Install in 15 minutes. Without overdrive, your vehicle turns into a time machine and takes you back to an era where it was the norm for a vehicle to scream down the highway at 3000 RPM. Overdrive Planetary Assembly. K3500 sierra. There are two steel governor fluid tubes out the rear of the main valve body. I was wondering about the codes as well. In OD, truck shifts smooth through First, second and third, just wont shift to overdrive. Shifting is NOT erratic. GM Truck / Car / Van / Motorhome2 Wheel Drive 4 / 5/ 6 Speed Automatics There are two basic GM 4-Speed automatics: The light duty 700R4/4L60E found mainly in half ton and car applications, and the heavy duty 4L80E in the heavier applications. The 6L80E’s gear rations are as follows: Bolted to the LS2 is a GM 4L80E transmission with a billet torque converter that sends power to a Currie 9-inch rear axle with a 3. Fluid is clean, no metal shavings, no burnt appearance or smell. It slipped at around 40k and at around 80K as I was getting up to speed and the gears needed to shift. So - it's had a long life, I use it for going to hardware, dump, nursery, etc. Cheap and Easy to do!. It shifts hard particularly between 2 & 3 and mainly when first starting cold. I adjusted it according to the manual. As a comparison of cost, our PT4L80ESS transmission and 3000 stall converter sells to forum members for just $3535, no core required. alot of people i know dont like the 4l80e because of the high first gear ratio and they are longer than the 60e or 700r4. I build 4L80E's electronically or manually controlled and I can set them up with a full manual VB that has mild shifts at light throttle and hard shifts at WOT with or without lockup. 4l80e straight cut gears, ATF Stage 4 HD 4L80E Race Transmission (Rated up to 1500+ WHP) • Comes with ATF Reid Bell Adapter & Reid Chevy/BOP Bellhousing machined by ATF for more clearance in small Transmission Tunnels • Comes Standard with a 2. Attached page is from the 4L80E Technician's Guide. This product has been designed, engineered and tested to meet the highest. Erratic Shifting, Slipping, or No Gear/Overdrive Engagement. As the subject says. It has run great and shifted perfect since I bought it, 1000 miles and suddenly it shifts hard from 1st to 2cd and has no overdrive and no passing gear. COMPLAINT: No up shifts. There have been some trouble with the tranny since I've bought it 6 months ago. 0L LS engine and felt the 4L60E as designed could not withstand the torque & horsepower of that engine. To get engine braking, the lever must be in 3rd or lower. In this Suncoast Gm 4L80E transmission rebuild kit we include an upgraded Sonnax stator support busing. this will. 3/8-16 tap and set screws work. The truck is a 2002 chevy silverado 2500HD with a 6L and 4l80e. My guess is the front seal. Its a 4l80e modified by them to be a 6 speed. Sporadically shifts a little hard first to second, second - Answered by a verified Chevy Mechanic. A plus over the 4L80E is that you can split shift it and make a 5 speed out of it, and I actually do that. 10s help it move from a stoplight and I prefer the 1-2 shifts in the 400 versus the huge RPM drop you get with a 700/4L60e from 1st-2nd gear. CAUSE: Bottom broken out of actuator filter Or, O'ring not installed on filter. However, and please don’t take this wrong, but when someone gets a transmission out of dump truck or full-size 3/4-ton / 1-ton truck, it’s kind of expected. A torque con- verter clutch automatically engages at cruising speeds to improve fuel efficiency. The accumulators are used to help control shift performance by increasing the amount of time required to completely apply the clutch packs, or servo, that applies the band. The Turbo 400 is still regarded as one of the greatest transmissions ever developed, and even nearly half a century after its initial release, GM is still building the 4L85-E, a com­puter-controlled overdrive version of this transmission. 95 4L80E YEAR PART NO. 70 overdrive. For example, during the first gear, the 4l60e has a gear ratio of 3. In the late 1960's, Fred Hone marketed and sold the Hone-O-Drive, an overdrive unit he had been developing for four years. In 2001 GM introduced a 6. All I had to do is flick the key and get it back. Shift Kit 4L80E TRANSGO Part # K34908E Reference # 34165 Extra information Fits General Motors 4L80E, 4L85E, 1991-2009 Includes New Boost Valve assembly, High Pressure Relief assembly, Stronger better design Solenoid filter, Case to Center Support seals, 4th clutch strong bolt and other items which improve overall drivability and durability. I'm sure it's the original trans. 98 ECSB 1500 4x4, 555 CID, 4L80E, 411, N/A for now. 4L80E 4L85E Shift Kits. FYI - 4L60E & 4L80E transmissions are NOT directly interchangeable. Try driving aboud 45 and letting up on the gas and watch for it to shift(rpm drop). Transmission Shifting Hard from 1 st to 2 nd: The Reasons. FYI - 4L60E & 4L80E transmissions are NOT directly interchangeable. We complimented the install with a TCI Outlaw shifter that contains two buttons for manually up shifting and down shifting the 4L80E. As the 4L60E ages, one of the most common problems that it develops is that it won't shift into overdrive anymore. Then the light came back but no overdrive problems. Here's the weird part. While in drive at 35mph or so, if you stomp it (not necessarily to the floor) it will shift into overdrive, however, if you lift off the accelerator or the truck levels out based on where you have the accelerator, it immediately drops back down into drive even if you are going 65mph. But if I had to back off the pedal, it would downshift back into 3rd, then later repeat the whole 4500 rpm over-rev maneuver to go back into OD. It acts like it's one gear off from what the shift indicator says it is. Don't just compare our kit prices by the bottom. If i have the overdrive enabled then it wont shift from 3 to 4. it shifts nice and hard. Whether you need 4L80E wiring diagram information, 4L80E transmission rebuilders tips, 4L80E technical information, 4L80E diagnostics, 4L80E troubleshooting help, or just answers to your 4L80E transmission rebuilders question, the Transmission Rebuilders Network is the place to go!. 7 liter gas engine or the 6. For instance, if the shift lever is in third gear, it feeds a circuit that prevents overdrive from engaging. Thanks for the help!. Searching for a HP Tuners 4x4 4L80E file to fix a 4 low range problem I'm having with a 6. Hughes Performance has a 4L80E transmission available for practically any engine combination and power level. 0 liter gas engines after model year 2000 trucks. You will need a flexplate and spacer from ¾ ton GM truck that originally came with a 4L80E. >Shift mechanism. The transmission, 4L80E, will not shift out of first, abs light is on, no speedometer, no heat or a/c, all at the same time, then all went back to normal with gerky trans shifting, then all went to ma. An engine management harness is pretty much what you will find from most wiring harness companies. Nov 27, 2002 · the trans gear ratios are. Also, part of the plan from the beginning was to get a Gear Vendors unit with the 4L80E for double overdrive. The truck is a 1991 3500 6. You hop into your car, turn the ignition key, shift to ‘Drive’ or ‘Reverse’, and there is a seemingly long delay before the transmission engages. 140,000 miles I bought this truck with the hard shifting present. If anyone can help let me know, thanks. However, that only indicates 3 forward gear positons while the 4L80E has 4. We are using the stock gear selector sensor which we adapted to work with the 4L80E (see the pics above on this). I also recently turned on the torque converter clutch to activate in overdrive. When the overdrive function is activated, the truck should shift at around 3,000 to 4,000 RPMs. The vehicle is a 1998 Chevy Express 3500. 70 so max performance shows I NEED A 3. I have both laying on the floor of my shop. 1999-2000 Chevrolet K2500 5. 4L80E Hard Shifting Jan 25 2012, 5:52am Hi, I have a 1992 silverado with a 4L80E trans. This product has been designed, engineered and tested to meet the highest. America's leading site for discount B&M Shift Plus 2 Electronic Overdrive Transmission Controller 120001 prices. Simple Shift is the latest breakthrough in electronic overdrive transmission control. I use Art Carr's Super rebuild kit and Mike Kurtz/Art Carr shift kits. 73 REAR GEAR AT 126 MPH IN THE LIGHTS TO KEEP THE RPMS IN 3RD GEAR AT about MAX hp (6000rpm) and still have a 75mph 2490rpm cruise with the 700r4 trans in overdrive, when I swap to the 4L80E. First, make up a special tool that will allow you to manually lock the servo down. This product has been designed, engineered and tested to meet the highest. You just shift when you're good and ready. From my research, it appears the physical dimensions and ratios for both are the same but the 4L85E can handle more power and torque. Common complaints on this transmission are no upshifts, soft 2-3 shift, burnt direct frictions, broken hard. 2nd the overdrive shift coil is bad. The whole swap took about 6 months. Dave from Ghetto Van Adventures gives you a cheap and easy solution to look at if your vehicle is shifting hard and you have no overdrive. The cruise control and overdrive dont seem to be working. I have both laying on the floor of my shop. The vehicle is a 1998 Chevy Express 3500. Here's the weird part. Introduced alongside the original 4L60 in the early 1990's the 4L80E was designed for large trucks and is designed as a heavy duty unit, rather than a transmission for smaller cars or even some pickups. The car shows that it's shifting from 1 to 2 to 3 to 4th, but it isn't, it just stays in 1st. 4th gear on the forester -is- overdrive. Overdrive Planetary Assembly. So far, I've determined that its not a major internal hard part failure. I think it was a replacement of the main connector and attaching wires. It shifts hard particularly between 2 & 3 and mainly when first starting cold. In 2001 GM introduced a 6. 3 shifts normal 4 yes at the beginning of a trip, until I hit a hill or a bit longer miles so it might be heat related 5 no light on 6 n/a 7 2000 8 after going up hills and have a decent load it will to shift into overdrive so I am stuck going pretty slow to keep the RPM's down 9 I believe so 10only service work done was trying to fix this issue. Nov 27, 2002 · the trans gear ratios are. To address this problem, every remanufactured 4L80E transmission by Street Smart Transmission receives 8 brand new solenoids that are pressure tested to ensure that they function properly. 3 engine and a 4L60E trans, it has been rebuilt 1 month ago and still shifts hard from 1st to 2nd only, other gears shift. 4L80E 4L85E Shift Kits. 93 4L80E hard shifts/no overdrive. 73 REAR GEAR AT 126 MPH IN THE LIGHTS TO KEEP THE RPMS IN 3RD GEAR AT about MAX hp (6000rpm) and still have a 75mph 2490rpm cruise with the 700r4 trans in overdrive, when I swap to the 4L80E. Some of the features are: Full manual shifts – the transmission will be in the gear you select and changes to any gear you choose when you move the selector, no computer or wiring needed, Red Eagle clutches, Carbon fiber ba nd, RedEagle PowerPacks for the forward. alot of people i know dont like the 4l80e because of the high first gear ratio and they are longer than the 60e or 700r4. My car didn't slow down at all. I'm building one with a TCI manual shift trans brake, 5 pin planets, TCS and ALTO HD internal parts, and using a TCS 10" with lockup convertor in high gear. The 6L80E’s gear rations are as follows: Bolted to the LS2 is a GM 4L80E transmission with a billet torque converter that sends power to a Currie 9-inch rear axle with a 3. That is to say when they are moving at a. THe 4L60E is the electronic version of the 700R4. I had the 4L80E in my truck rebuilt after a major planetary failure. PA’s Matt Jewell tells us that their GM offerings make up more than half of their total sales. Tires would be a good driver for anything i want to do with it. com; Toggle navigation. Just purchased a 1993 Dodge 2wd automatic truck. You'll need an auxiliary overdrive transmission capable of gear splitting behind your 700R4, 4l60E and 4L80E. If however you have allowed the transmission to engage the OD in second (backing of the gas) then depressing the clutch is necessary to shift from 2nd to 3rd. Then she called and it was stuck in 3rd with no overdrive on the highway. electronic overdrive automatic transmission. I had a local shop do the install along with a MSD delete. Clearing the code PO894 makes it shift normally, but in a couple of miles of stop-n-go driving it starts again with the firm shifting. From my research, it appears the physical dimensions and ratios for both are the same but the 4L85E can handle more power and torque. 93 12 valve. 34004E- GM 4L80E Overdrive Transmission Rebuild Less Steel Kit 1990-96 4L80E Transmission Transgo Reprogramming Shift kit 4L80E-3 Stick Shift: Hard Parts. 73 REAR GEAR AT 126 MPH IN THE LIGHTS TO KEEP THE RPMS IN 3RD GEAR AT about MAX hp (6000rpm) and still have a 75mph 2490rpm cruise with the 700r4 trans in overdrive, when I swap to the 4L80E. Besides the transmission will shift out of overdrive in a few seconds anyway! And I always let off the gas a little bit when shifting if I can, because a low HP shift is better for the transmission than a full throttle high horsepower shift. 1999-2000 Chevrolet K2500 5. It is a 4X4 4. thanks for any info. The 4L80E is a much larger trans­mission with stronger internal com­ponents. I took it to a local shop that is small but has a top-notch Toyota trained mechanic running it and had him check. this is a computer. Simple Shift is the latest breakthrough in electronic overdrive transmission control. Introduced alongside the original 4L60 in the early 1990's the 4L80E was designed for large trucks and is designed as a heavy duty unit, rather than a transmission for smaller cars or even some pickups. 5 turbo with the 4L80E transmission. • Increased driving safety by reducing fatigue. Right now all the gears are lit up. However, that only indicates 3 forward gear positons while the 4L80E has 4. I would rather use a stiffer spring, but all three work well. 4L80E 4L85E Shift Kits. The adjustable ride is provided by Air Ride Technologies. No other codes where found. 3-4 signal oil is supplied to the 3-4 shift valve. 4L80E Hard Shifting Jan 25 2012, 5:52am Hi, I have a 1992 silverado with a 4L80E trans. The accumulators are used to help control shift performance by increasing the amount of time required to completely apply the clutch packs, or servo, that applies the band. 140,000 miles I bought this truck with the hard shifting present. I build 4L80E's electronically or manually controlled and I can set them up with a full manual VB that has mild shifts at light throttle and hard shifts at WOT with or without lockup. GM/Chevy 4L80E Alto Deluxe Transmission Rebuild Kit 1997-On. 4L80E Problems: No 3rd or 4th gear | Drivetrain Resource. >New crossmember, readily available from the parts stores >Drive shaft will need to be shortened and rebalanced. Nov 27, 2002 · the trans gear ratios are. The 4L80E has a lot more potential for power capacity as well as better … The transmission was redesigned internally and given a 5-pinion planetary set for both front. 1 L Avalanche, the Tahoe, and the Hummer. I assumed it was just toast but then read about the many. We complimented the install with a TCI Outlaw shifter that contains two buttons for manually up shifting and down shifting the 4L80E. From my research, it appears the physical dimensions and ratios for both are the same but the 4L85E can handle more power and torque. The Gm 4l80E transmission is found in Chevrolet and GMC pick ups, G vans and commercial chassis with GVW of 8600 or greater from 1991 and up thru 2006, Isuzu NPR and NQR trucks as well as GMC/Chevrolet W3500 and W4500 trucks with either the 5. I checked the TV cable, it was fine (at the same adjustment it has always been at), tried different adjustments just to rule that out and no change at all. How do I get it out of limp? I saw you can reset the tcm but did not see how. This shifter assembly will control the up shifts and down shifts on the Pace Performance 6L80e or 6L90e transmission package. The Quick 4 controller makes your 4L60E, 4L80E, 4R70W, E4OD, or 4R100 transmission work in a wide variety of vehicles, including ones not originally equipped with electronic control. Codes can be cleared by. Our PerfectFit™ Conversion Kits come with all the parts necessary to convert your Chrysler, DeSoto, Dodge, Imperial, Plymouth or other Mopar car, truck and street rod into a modern overdrive 5 or 6-speed or 4-speed automatic. March 18, 2019. I already have a Novak adapter for a GM automatic, so a 4L60/65/70/80E swap would be an interesting choice. 5l, with mechanical pump and a 4l80e tranny. It does not have a direct 1:1 ratio like the 4L80E and 4L60E, which is worth noting. Decided will pull the original 235 and granny low 4 speed out of my series 1 55 3/4 ton. I'm hoping to get some help with problem #1 I put. When the temperature sensor reports 30 degrees F or colder, there will be no overdrive, and below 50 degrees F, there will be no torque converter clutch. The transmission, 4L80E, will not shift out of first, abs light is on, no speedometer, no heat or a/c, all at the same time, then all went back to normal with gerky trans shifting, then all went to ma. Buy It Now +C $30. >Parking Brake cables and mechanism need some rework to avoid the transmission yoke, which is now further back. nunya bizz; Aug 10, 2018; 4 2K Apr 5, 2019. 93 4L80E hard shifts/no overdrive. Just got done with the 4L80E swap myself. It offers a fourth gear overdrive to increase fuel efficiency. The Turbo 400 is still regarded as one of the greatest transmissions ever developed, and even nearly half a century after its initial release, GM is still building the 4L85-E, a com­puter-controlled overdrive version of this transmission. It is a 4X4 4. 4L80E OVERDRIVE PLANETARY ASSEMBLY. Built with upgraded internals and mild shift kit can handle 600+hp with ease. I would rather use a stiffer spring, but all three work well. This transmission has been built at our state of the art facility using the latest advancements in remanufacturing technology. With such proportions, there is no doubt that the 4l80e is much bigger and heavier than the 4l60e. After cycling ignition switch again it drove normal then dropped out again. When going from 3rd to overdrive, the tach would rev up to around 4500 rpms and then it would drop into overdrive. Same Bell housing issue with the starter, and same issue with the shift indicator lights. gm 4l80e gear ratios, Apr 17, 2015 · It fea­tured gear ratios of 2. Its a 4l80e modified by them to be a 6 speed. It comes with an awesome computer that you can modify every single aspect of the transmission, from shifting so hard it makes your teeth rattle to so soft your not sure it even shifted. The converter is totally different for a 4L80E, it won't even slip into place on a TH400 or vice versa. All of a sudden it quit shifting into overdrive. This means that with a 3. I think Four Wheeler did a suburban with this setup but I cant find any info about it. Whether you are trying to move a couple tons up a steep incline or moving just a couple thousand down the track — the fastest way is with the right gearing. I had a code 22. First, make up a special tool that will allow you to manually lock the servo down. I did go to AAMCO transmissions in town today and they told me I need a complete rebuild and they found a code P1870, "Transmission Component Slipping". However, and please don’t take this wrong, but when someone gets a transmission out of dump truck or full-size 3/4-ton / 1-ton truck, it’s kind of expected. Sporadically shifts a little hard first to second, second - Answered by a verified Chevy Mechanic. Frequent, proper vacuum testing can put money in the bank, improve turnaround time in your bays, and prevent costly comebacks. So the "Rule" is that if the transmission will stay in overdrive, then keep it in overdrive. 1 L Avalanche, the Tahoe, and the Hummer. 06 first gear which is good for initial take off but this makes the transmission have the widest ratio … Continue reading GM 4-Speed Auto →. Although some people like the B&M shift kit, I personally don't like using the spacers for the accumulators. 4L80E 4L85E Shift Kits. What you think is simply a hard shift can require a complete rebuild to correct. Without overdrive, your vehicle turns into a time machine and takes you back to an era where it was the norm for a vehicle to scream down the highway at 3000 RPM. The Turbo 400 is still regarded as one of the greatest transmissions ever developed, and even nearly half a century after its initial release, GM is still building the 4L85-E, a com­puter-controlled overdrive version of this transmission. For all practical purposes all 4L80E transmissions for sale are the same except for the super duty model that came in the heavy duty series trucks. Then later on in the day it was shifting way later and very hard (like barking the tires at part throttle) and it got worse the warmer the trans got. 5 with a 4L80E that has started having extremely hard shifts and won't shift into overdrive. March 18, 2019. Hi On my 2009 Corolla LE, when I step on it to pass and it downshifts, I frequently get a hard upshift back into overdrive. It currently shifts a little hard going from 1 to 2nd. This shifter assembly will control the up shifts and down shifts on the Pace Performance 6L80e or 6L90e transmission package. Part throttle goes up & down through the gears with no issues, including OD & TCC lock and unlock. 5 with a 4L80E that has started having extremely hard shifts and won't shift into overdrive. >New crossmember, readily available from the parts stores >Drive shaft will need to be shortened and rebalanced. That way you don't even need the computer if you don't mind shifting and hardly drive it (trans brakes and manual shifts are hard on parts and can be dangerous if not used properly). Built with upgraded internals and mild shift kit can handle 600+hp with ease. While driving down the road at a speed of 70 to 75, I can shift it into drive and let off the accelerator, put back into od and it will shift into od, but as soon as I. 99 in our huge selection of parts. If I'm at 55mph it stays locked. For the car crowd, a quality transmission needs to shift hard, hold big power, and take a beating run after run. Elsewhere in this story we’ve listed the ratios of both the TH350 and the 700R4/4L60E. Cruise control and speedometer STILL work. Rebuild kits/Shift kits. 70 so max performance shows I NEED A 3. with a lot of hard, honesty, and quality parts used suv = towing = 4x4 =z71 =big tires = big hp = hard use 700r4 4l60e - $795 >>>>> also complete overdrive conversions for any hp level vehicle <<<<< heavy duty 700r4 4l60e 4l65e 4l70 suv towing big tires big hp truck track car 4x4 mud z71. Add in Ford’s newer crop of electronic automatic transmissions and GM’s 4L60E, 4L70E, and 4L80E, and you can see that the numbers are staggering. This is an example of the 2-3 shifting solenoid. If you’re moving to a modern overdrive transmission, like we were with a 4L80E, things become a little more. In 2001 GM introduced a 6. Made from 1991 to 2006, it was even used by Rolls Royce from 1992 to 2002. 0L LS engine and felt the 4L60E as designed could not withstand the torque & horsepower of that engine. A Complete System Correction and Recalibration Kit improve pressure control and shift quality. Overdrive Planetary Assembly. My 4l80e hauls, hauls ass! :lol: It was easy and cheaper than the 60e. - Reinstall the y-pipe and all O2 sensors. What you think is simply a hard shift can require a complete rebuild to correct. I did some research on here and found the transmission is in limp mode. There is no engine braking in any gear if the transmission shift lever is in 4th, regardless of the shift solenoid operation. 5 Star's HP Tuner calibration plays around with the fueling and timing a bit, and produces a You guys here on SVTP are probably familiar with just how. GM Truck / Car / Van / Motorhome2 Wheel Drive 4 / 5/ 6 Speed Automatics There are two basic GM 4-Speed automatics: The light duty 700R4/4L60E found mainly in half ton and car applications, and the heavy duty 4L80E in the heavier applications. It either would not shift from second to third or third to o/d. It will not shift into overdrive until you get over 2500 rpm and you still have to let off the gas to make it go into overdrive. Shifting is NOT erratic. 06 first gear which is good for … Continue reading GM 4/5/6-Spd Auto →. Our compact shifters provide the best fit and shift quality available. 010" ID RACE. Use a liquid thread locker like Loctite. But if I had to back off the pedal, it would downshift back into 3rd, then later repeat the whole 4500 rpm over-rev maneuver to go back into OD. The ultimate set-up is already well known. Ultimately, GM owners and lessees face mounting repair costs because of the alleged defect, the complaint says. 1-What controls the shifts in a 4L60E 4L80E and can I replace the PCM with a vacuum modulator. 55:1 rear gear, the overdrive drops the effective rear gear ratio to 2. 5 with a 4L80E that has started having extremely hard shifts and won't shift into overdrive. It offers a fourth gear overdrive to increase fuel efficiency. That's a good point.