4l80e reverse servo fix. Unlike Sonnax Performance Pack HP-4L80E-01 upgrades GM 4L80-E and 4L85-E transmissions for maximum performance and durability in work/sp Nov 18, 2011 · 1997 Chevy Suburban K1500 - 6. com FREE DELIVERY possible on eligible purchases Sonnax Low/Reverse Servo Piston 34914-02 is a high-strength billet aluminum, direct-replacement upgrade servo piston to prevent failure in the 1996 and later GM 4L80-E transmissions . Gas, 6-Bolt Bell Housing, Casting Number 24204250-8. Jan 17, 2021 · Managed to get the reverse servo pin dialed in at . 8624140, 8627193, 8624141, 8627194, 8627195 View Instructions Find a Distributor Aug 1, 2024 · GM 4L80E *REVERSE FIX* Band Servo Piston Apply Pin Extender Kit 99454* Authentic Fitz-All Made in USA + Cover Gasket & Seals! OEM Solenoids. Check Details Apr 23, 2017 · I ran into this problem maybe a month ago. Reverse servo. Rear band fault: • wrong band apply pin • Band worn 5. Jul 15, 2018 · I got the trans all together and installed it. Nov 27, 2023 · Servo reverse transmission 4l80 piston slipping rear rod band gm fix Transmission 2wd built forums performancetrucks ls1tech silverado classifieds parts thanks4l80e transmission 4wd, 4l80e 4x4, 4l80-e, 4l80, super duty 4l80e Tci 6x 6-speed gm 4l80e automatic transmissions 271600Chevy 4l65e automatic transmission. Now with about 22k miles on this transmission, I noticed yesterday that it will slip while in reverse if going up a slight incline, or stepping slightly on the accelerator pedal while in reverse. Buy Now! Transtar is an NMG Company. 1% positive; Seller's other items TROUBLESHOOTING THE 4L80E AUTOMATIC TRANSMISSION INTRODUCTION The Hydra-matic 4L80E is a 4-speed automatic transmission which uses electronic control for smooth shifting. 4l60e rebuild diagram. This was a late-model 4L80-E (smooth band) with the shift concern of "No Reverse. com FREE DELIVERY possible on eligible purchases Nov 21, 2011 · Has the trans been recently overhauled?The lo circuit for the band and or reverse is very basic. " It's important to note that this vehicle was an extremely overloaded truck used by a utility company. previous owner did take pretty good care of it as far as maintenence and had rects for Find many great new & used options and get the best deals for 4l80e GM Transmission Servo and Cover 24202929 24203021 at the best online prices at eBay! Free shipping for many products! Find many great new & used options and get the best deals for 4l80e GM Transmission Servo and Cover 24202929 24203021 at the best online prices at eBay! Free shipping for many products! Automatic Transmission Servo Sealing Rings, Low and Reverse Band Servo Piston Seal, Chevrolet, THM-R2, TH475, TH400, MT1, MN8, M40, 4L85E, 4L80E, Each Part Number: ADO-8623430 Not Yet Reviewed A 4L80E servo assembly has all the parts needed to work on your unit, having pistons, gears, and even full assembly kits. Due to a design change in 1996, the reverse servo commonly breaks because it is stressed more than early servos. it probably has a worn lining and therefor the pin is bottoming out on the bottom of the servo bore before applying the band. It isnt just 400 4l80e. I mean to say, when i shift in to R , i feel the klick and it seems it will go reverse but it not go,s. If you push in on your servo cover, you'll notice that it moves in around 1/8"-1/4". Strict quality control standards to Build and test. Probable Faults: 1. According to the company, this kit is designed to be used with an aftermarket performance 4-5-6 clutch hub and intermediate shaft, with the hub splined to fit a Powerglide friction and the mating steels designed May 30, 2022 · 【FEATURE】Transmission Reverse Servo Pin Extender. A reliable and orderly diagnostic approach is splitting the circuits. Nov 17, 2021 · Description: Transmission Reverse Servo Pin Extender. Fits GM TH-400 / 4L80E. The gear will refuse to shift to reverse to protect the transmission system from further damage. 80 which is what Jake recommends for faster leave on the trans brake. Installation & Assembly a. ebay. "PRND4" oil acting on the release Dec 13, 2023 · 4l80e transmission reverse band apply servo 4l80e transmission 4l60e transmission from yukon has no reverse part 1 4l80e diagnosis of reverse leads to discovery. b. com/ro Oct 18, 2018 · So if everything is in great shape except the reverse drum and band that reverse servo could very well be the problem. Also make sure the band anchor pins havent moved out from the centerline Jun 6, 2018 · The servo pin in Sonnax servo pin kit 77787-02K is longer than the longest OE pin in GM 4L60, 4L60-E, 4L65-E and 4L70-E applications. 【FITMENT】GM TH-400 / 4L80E. 7l 5. Mar 22, 2015 · Bought a reman 4L80E to replace it with. Oct 26, 2023 · I'm not a transmission expert or anything, I just figured this might help someone else faced with this situation. I checked the pressure in reverse at idle and it was delivering almost 300psi so I knew the oil circuit was decent. Shift linkage loose, misadjusted or damaged. Mar 6, 2011 · Without sounding like a kolotripidtha (ie asshole) I have a Very Precise means of checking the band clearance. But I noticed I loose reverse and Tbrake holding when the trans gets warm. Transmission Reverse Servo Pin Extender. 45: SKU# T34913: SERVO EXTENDO PIN Fits: GM 400 & 4L80E Extend your servo pin length in seconds! Apr 4, 2017 · Buy Shift Rite Transmissions replacement for 4L80E 97-UP SERVO PISTON REAR BAND APPLY PIN TH400 MT1 4L85E Shift Rite 4L80E: Hard Parts - Amazon. 48, second gear:1. Servo rear piston 4l80 assembly hump raised transmission merch chevroletFlow th400 schematron gm close Technical shift kit install questions4l80e trans no reverse. At . Jan 31, 2017 · Hi there!In this video I demonstrate how to make a tool to measure the travel of the reverse servo on a GM 4L80/85 or TH400 auitomatic transmission. # A34912AAC Notice the weakness of the red-circled pin area on the cracked OEM piston compared to the brute strength of our non-porous billet solution. 4l80e 91-96 servo piston rear assembly. When the check ball seats as commanded by the computer then the fluid does not exhaust through the exhaust ports. Includes Cover Gasket & Seals ! OEM Solenoids. Feb 15, 2005 · This package includes a longer then stock servo pin to get your band adjusted to the right clearance. 006" added to rod length to allow further travel for band engagement. Recommended. Did a lot of reading on the subject and found it could either be a band of some sort that is worn out OR it is common for the reverse servo pin to get worn or sheered off. It wouldn't surprise me if the band is damaged now. Dec 12, 2023 · OE/OEM Part Number: Fits GM TH-400 4L80E. SERVO EXTENDO PIN, GM 400 & 4L80E (Reverse) Check Details. with this advice, it has gotten me to where i am now. 4L80E diagnosis of reverse leads to discovery - YouTube. It would almost seem likely there is two seperate issues. 3LRS. Deciding wether to rebuild or get a junkyard trans, gonna check the junkyard for compatible while i'm out tomorrow, there's a 2005 silverado in their yard, along with an 2007. 0l 4. The torque converter operates in two basic modes. Will fit years from 1965 - UP. Been working absolutely perfect in every way. Reverse servo fault: • misassembled • Piston or seal damage 4. Adapt-A-Case. $8. Use to fix slipping or no reverse condition caused by moderately worn reverse band. After replying to your PM I decided to post some of it here. net. 4l80-e extended rear band servo piston rod fix for no reverse A Brand TH400, 3L80, 4L80, 4L80E, 4L85E spring. It offers a fourth gear overdrive to increase fuel efficiency. This weak link is prone to breakage while enduring the repetitive cycling that occurs in plow truck applications, when the boost valve has worn or when the pressure spikes. Servo reverse tool works gm measuring Reverse transmission Transmission diagram parts blow chevy manual 4l80 car Dec 8, 2009 · Some vehicles can lock out reverse if there is a speed signal from the VSS during reverse selection. com FREE DELIVERY possible on eligible purchases Aug 4, 2020 · 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. Made from high-quality materials for ultimate durability and long service life. This can be done in the vehicle and is a cheap fix. No power in reverse on 4L80e. B&M Racing Deep Aluminum Pan — 70295 [ads1] 4L80E transmission oil change Feb 1, 2008 · YHB Transmission Reverse Band Servo Piston Apply Pin Extender Kit Fits GM TH-400 / 4L80E - Extender Kit dummy ACDelco GM Original Equipment 24202583 Automatic Transmission Low and Reverse Band Servo Piston Pin Aug 17, 2014 · Servo has a harder job to hold the reaction carrier in reverse. My reverse went out. Jan 9, 2024 · Learn how to make your own tool to easily check band adjustment and servo travel in TH400 and 4L80-E transmissions. This unique kit includes components to precisely recalibrate pressures and shift accumulation PLUS heavy duty parts to repair damage, prevent future Feb 4, 2024 · OE/OEM Part Number: Fits GM TH-400 4L80E. Low fluid level. Check Details 4l80e airtest reverse band and dual feed 10x GM 4L80E REVERSE FIX Band Servo Piston Apply Pin Extender Cover Gaske G1B9. The Sonnax Reverse Servo Spacer Kit 34528-01K is a simple, low cost way to add durability to the 4L80-E transmission and eliminates the need to retro????? t early design reverse servo pistons into late units. Sep 30, 2005 · Sonnax Sure Cure Kit SC-AODE-4R75E targets the root cause of multiple concerns by sealing critical circuit pressure losses in the valve body. I also bought a new accumulator gasket and servo piston a. I removed the valve body and used new acdelco gaskets and new separator plate from rockauto. Top Rated Seller Top Rated Seller. 09. Jan 21, 2022 · Buy Transmission Reverse Band Servo Piston Apply Pin Extender Kit Fits GM TH-400 / 4L80E - Extender Kit: Automotive - Amazon. No need for selective pins, use the extender and grind to size. Starts getting hard to move at . Install a longer servo pin. There is nothing worse than getting the transmission installed, putting it in Reverse and then not going anywhere or having no engine braking in Manual Low. Oct 26, 2015 · I'm trying to adjust the servo pin to ensure reverse works OK. This is way too much travel, it should be closer to 1/16". Reassemble the low/reverse servo with Sonnax components as shown above. 3. It acts exactly as neutral. The tool Jun 20, 2017 · I would say that the "longer pin" fix is for when the band is worn down too much. Aug 30, 2022 · Buy Transmission Reverse Servo Pin Extender & Cover Gasket & Seal Kit fits - TH-400 4L80E: Gaskets - Amazon. It does not slip at all going forward. Opens in a new window or tab. Provide 1 year quality assurance. Splitting the circuits means separating and analyzing the hydraulic, electrical and mechanical issues that could create the problem. Description. We have a way of using the longest servo pin available and dropping the pin further into the cover so it doesnt drag when the band is not applied. The kit contains uniquely designed parts to prevent the loss of pressures within the main line, converter clutch, overdrive and solenoid circuits. There is a symptom called overrun braking and yes it can be from a broken low/reverse band (first gear) Apply pin can wind up too short due to the wear of the band. Once it fails, the vehicle can become immobilized. On a flat road it go,s a litle bit reverse. MOROSO Deep Sheet Metal Pan — 703525. [Excellent quality]Our auto parts are subjected to severe impact,wear and fatigue tests. OE pins have seven different lengths to allow for adjustment of the Low/Reverse band but are no longer available from GM. I have a reverse by either putting the shifter on rev or using the Tbrake button in neutral. Especially when the whole world is at your fingertips through a keyboard. Jan 31, 2019 · 2001 GMC 2500HD 4L80-E Reverse servo extension for a quick fix to get back on the road without pulling the transmission out and down. That didn't happen to your transmission. Answering challenges with profitable solutions. GM 4L80E, 4L85E 4-Speed Automatic Transmisison Case Rear Cooler Fitting Design 1997-1998. 0L 4l80e no reverse, thought i could put the pin extender on and call it a day, still no reverse. Due to a design change in 1996, the reverse servo piston commonly breaks because it is stressed more than early servos. You can pull it out and check it with pan removed, may need to loosen or remove valve body to get the servo cover off. Disassemble OE low/reverse servo assembly. 2. Oct 24, 2023 · Picked up an 02 gmc 1500hd 6. Breakdown of Included Items. Fits all TH400 & ’95-earlier 4L80-E. If it is good, suspect band lining has compressed enough to require the need for a longer rear servo pin or band replacement, or the band anchors or lug has been damaged requiring band replacement. 【FUNCTION】Use to fix slipping or no reverse condition caused by moderately worn reverse band. Problem #8 - The Low/Reverse Servo Piston In an attempt to save money, the factory Low/Reverse servo is manufactured from a cheap aluminum casting that simply gets the job done until it doesn’t. Discard OE spacer and E-clip. With this kit, you will be able to give your servo system the maximum effort of output for your transmission. It's also possible the reverse servo is broken. Get deals on automotive parts, truck parts and more. Sep 30, 2005 · Sonnax Sure Cure kit SC-4L80E, fully compatible with '91-later GM 4L80-E and 4L85-E units, is a comprehensive reconditioning package featuring the best Sonnax products developed to help rebuilders restore and enhance transmission performance. Apr 21, 2024 · Th400 reverse manual valve body. Sep 21, 2023 · Servo reverse gm extendo sku Oregon performance transmission 4l80e, 4l85e. Once I get going though (like if I start nose up on a slight incline) I can keep going reverse no problem. 【PACKAGES INCLUDES】1 x Transmission Reverse Servo Pin Extender With Cover Gasket & Seal Kit. 3. This servo is bad about cracking. This is not a permanent fix, but should get me Jun 19, 2019 · The 4l80e transmission is nice to have in a cruiser with big HP, but this particular one we pulled from the scrap yard in a previous video has had some issues. Maybe eletrical for the 4th gear problem and either a direct clutch or L/R band issue for rev problem. Buy A/Trans Seal, Reverse Servo Piston Cover - ATP 13840 online from NAPA Auto Parts Stores. Oct 7, 2020 · On a flat surface I can sort of reverse but really hard to get going. A torque con-verter clutch automatically engages at cruising speeds to improve fuel efficiency. I noticed that the bottom end of the piston was shattered and chunks of metal were laying in the bottom of the housing. But sinds twoo weeks it has no reverse anymore. ID is as follows,from shortest to longest,1 ring,2 ring,3 ring and no ring. The 4L80E sometimes moves to the limp mode, a self-preservation mode. Brand New. 4l80e transmission rear servo assembly late style fits all years gmcServo transmission reverse rear spacer kit sonnax transmissioncenter Gm 4l80e**reverse fix**band servo piston apply pin extender cover4l80-e Jun 18, 2024 · 4l80e transmission diagram4l80-e extended rear band servo piston rod fix for no reverse or How does a 4l80e transmission workReverse lockout solenoid and shift skip solenoid. 9% positive; Dec 31, 2014 · About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety How YouTube works Test new features NFL Sunday Ticket Press Copyright 0. OE Part No. 1 x Transmission Reverse Servo Pin Extender With Cover Gasket & Seal Kit. May 14, 2011 · This helps reduce the possibility of throwing money at parts in hopes to repair. 2 diesel from ,91 now ,tranny 4L80E. Store (112661) 98. 34912-01K Fits all TH400 & '95-earlier 4L80-E. Sonnax adjustable rear servo pin kit 34912-01K replaces GM TH400 and ’95-earlier 4L80-E servo pins. The problem that I have is when the trans is cold and not too hot. 70 - . NOTE: Do NOT reuse a cracked piston. Note: Replaces GM OEM part number 24202985 4L80E Billet Reverse Servo When failure is not an option. Jun 22, 2023 · 4L80-E, TH400 Adjustable Rear Servo Pin Kit Part No. Install a pressure gage and note pressure in reverse. The direct clutch helps engage the reverse, as well as the third and fourth gears. Jun 13, 2024 · | repair guides. TCI 4L80E/4L80E Deep Aluminum Pan — 278010. Caleb Perham Servo Part Reverse Servo Spacer Kit Before You Begin transmission pump wear and other issues. Mar 29, 2017 · Looking for a leak in the reverse circuit I come across another HUGE leak! It was coming from the 2-1 manual band servo. The second mode is when “TCC is applied” where 4L80E / TH400 Adjustable Rear Servo Pin Kit, Sonnax 34912-01K. Store (110660) 99. Check Details. 07. C $22. 45: SKU# T34913: SERVO EXTENDO PIN Fits: GM 400 & 4L80E Extend your servo pin length in seconds! Oct 23, 2023 · Gm 4l80e**reverse Fix**band Servo Piston Apply Pin Extender Cover. Rob has had the original 4l80e Jan 22, 2012 · Install the locking tool onto the Low/Reverse servo. The extra length simpli Dec 23, 2019 · General Repair Professional Low line rise in Reverse; Required. I pulled the reverse servo/accumulator apart and spot where the shaft pushes on the band appears to be in the correct spot. It doesn't even think about moving the tires on the lift. 4L80E, 1997 Up Low / Reverse Billet Servo. Inspect reverse piston for cracks and replace if necessary. I can drop 2k on a replacement or I can try to fix it myself. Fits for GM TH-400 / 4L80E. com FREE DELIVERY possible on eligible purchases Jul 17, 2021 · I have a fully built 4L80E wit a billet RMVB with a Tbrake and no 1st and 2nd band engagement. 110" travel, its's hard to move the output shaft. 48, third gear:1:0, fourth gear:0:75, and reverse gear:2. 4l60e 1998-2005 4x4 (298mm) transmission 5. Mar 24, 2022 · Alto announced the introduction of a 4-5-6 high-performance PowerPack for GM 6L80E and 6L90E transmissions, model years 2006 and on. You Earned It: 20% Off Code: LABORDAY Oct 13, 2023 · 4l80e transmission diagram Gm 4l80e reverse servo pin measuring tool how to also works on th-400 Piston servo. Adjustable Rear Servo Pin Kit '95-Earlier 34912-01K; Reverse Servo Spacer Kit '96-Later 34528-01K* Case. 1. With the pictured band and drum Pin length had the band start scraping the drum at this point, and engaging shortly after. It's not rocket science to replace the reverse band and/or the reverse servo, and not particularly expensive either. 5TD, 4" SSD Exhaust, SSD FSD Heat Sink mounted behind bumper, 3 gauge pod (EGT, Boost, Trans Temp), HE351VE currently with VGT control (peak 15-18psi using Ford wastegate actuator), Water-to-Air intercooler, Heath GL4 ECU Jan 14, 2005 · Shift Repair Kits; Zip Valve™ Drop-In Repairs Line Pressure Booster Kit 4L80E-LB1. It has 210 lbs of pressure in all gears including reverse even though there is no reverse. Let's see how it goes. 03-23-17 11:26 PM - Post# 2683044 In response to someotherguy I have pulled the pan of my 4L80E and loosened the reverse servo cover to look inside. Jan 16, 2024 · Diagnosing the Elusive No Reverse with the 4L80-E; GM 4L80-E; Sonnax highlights adjustable rear servo pin kit Add durability to GM 4L80-E, 4L85-E units with Sonnax reverse servo spacer kit #34528-01K, which eliminates retrofitting reverse servo pistons into late units. www. A worn or damaged direct clutch can cause no reverse issues. The servo is definitely a possibility. Apr 7, 2023 · [Fitment]GM TH-400 4L80E [Package included]1 x Transmission Reverse Servo Pin Extender With Cover Gasket & Seal Kit [Function]Use to fix slipping or no reverse condition caused by moderately worn reverse band. Easy TH400, 4L80-E Reverse Servo Setup: Craft Your Own Tool. This Sonnax 34912-01K Adjustable Rear Servo Pin Kit for GM TH400 and 1995 and earlier 4L80-E transmissions has a pin length adjustment range that allows for Low/Reverse servo piston travel, with an O-ring groove seal that keeps the line pressure from bypassing the case pin bore. Sonnax flat washer is installed with rounded edge against Pin Extender Reverse Servo 400/4L80E Transtar Part Number: T34913. TCI 4L80E/4L80E Deep Aluminum Pan — 278000. Required. ATI Performance Products — 703505. 4L80E Reverse Servo Pin Fix How To + Boost Test Drive | 7875 Turbo 5. Direct clutch fault: Support The Channel:Affiliate Links (buy anything from ebay through one of these links and I'll a small percent of the sale):Ebay - https://rover. Reverse checkball ball check trans 2009 gm question performancetrucks where size goodwrench9124 clutch front band justin 4l80e exploded diagram Gm 4l80e reverse servo pin measuring tool how to also works on th-400 Nov 13, 2014 · :banghead: first off i want to say thank you for the posts ive read regarding this issue. Oil contamination The 4L80e uses four forward gears and one reverse gear in the following ratios! First gear:2. Oct 26, 2015 · 4l80e reverse servo adjustments and questions Jump to Latest 37K views 22 replies 6 participants last post by tgui9660 Nov 2, 2015 Sep 1, 2009 · It could be a worn reverse servo seal. It is also glide and others. 110" float. Aug 3, 2023 · Low-reverse servo assembly and servo cover changed; previous design had a flat top while 2nd gen design had a hump; pin lengths changed as well Pump body redesigned; pump cover aka stator support redesigned Bonded steel/rubber pistons (National Seal) introduced into forward, direct drums Aug 29, 2009 · Fluid pressure must be delivered to the Torque converter solenoid and the 4th gear shifting valve The shifting solenoids work through electromagnetism. Type: Transmission Reverse Servo Pin Extender. Sep 25, 2022 · The mechanic will then decide whether to repair or replace altogether depending on the extent of the damage. 4L80-E, 4L85-E Line Pressure Booster Kit 4L80E-LB1. Jun 22, 2023 · Servo. com Overall, the 4L80E is a fairly heavy-duty transmission. long story short just bought a 98 k3500 6. Mar 31, 2024 · GM 4L80E *REVERSE FIX* Band Servo Piston Apply Pin Extender Kit. May 12, 2024 · OE/OEM Part Number: Fits GM TH-400 4L80E. Heavy Duty Case Bushing Kit 34006-SPB* *For a more comprehensive build that maximizes transmission performance and durability, use Sonnax Performance Pack HP-4L80E-01 in place of these components. The reverse servo actuates the reverse band and engages the reverse gear. . It's almost more important to get the right clearance as it is to change to the Corvette servo. If not a 4 wheel ABS truck, that transmission uses two speed sensors to determine how much slippage is occurring and changes line pressure with a force motor on the valve body. 4L80E, Sonnax Reverse Servo Spacer Kit - PATC - TransmissionCenter. With Cover Gasket & Seal Kit. 4L80-E, 4L85-E The Dec 4, 2010 · Yes, reverse band failure is #1 reason for no reverse. The problem is the band lining. Your 4L80E Transmission Has Limp Mode. May 28, 2021 · If you have a failure in reverse gearing in your turbo 400 or 4L80E GM Transmission check the rod length for the reverse servo it could just be a little shor Sonnax reverse servo spacer kit 34528-01K is a simple, low-cost way to add durability to the GM 4L80-E and 4L85-E transmissions and eliminates the need to retrofit early design reverse servo pistons into late units. The first mode is “TCC released” This valve restricts pressure in the torque converter to about 110 psi regardless of how high line pressure rises. With the oil pan installed and filled to the proper oil level, make the shift test to see if you now have reverse with the parking brake applied. May 10, 2007 · Driving without problems for 8 years a 3500 K dually 6. Once the servo is out, you can manually apply band and try to tell if it is broke. It has a maximum input torque of 440 lb-ft and a maximum output torque of 885 lbs-ft with a vehicle weight rating of 800 lbs. c. Let’s follow through the flow of diagnosis in this one together Jan 22, 2012 · A vehicle comes into a shop after being on the road for nearly one year following a previous repair. Make sure that the bolt on the locking tool allows the oil pan to be reinstalled and fill the pan with oil. Jan 1, 2012 · Diagnosing a shift concern can be easy, as long as you understand some basic techniques to help get to the root of the problem. A malfunctioning servo can lead to no reverse. That would explain why the material in the band is down to metal and the drum surface is showing a lot of wear. Jan 16, 2024 · While not as sensitive as some shifting bands, the Reverse band adjustment on a TH400 or 4L80-E transmission is critical, and failure to get it right has tripped up even the best builders. Watch this video to get a full breakdown of everything you get in the most comprehensive transmission upgrade kit on the market for GM 4L80E and 4L85E units: Sonnax Performance Pack HP-4L80E-01. Dec 25, 2023 · Buy ACTIVLIFE for GM 4L80E Reverse FIX Band Servo Piston Apply Pin Extender Kit: Interior Accessories - Amazon. A guy I know had weak reverse on his 4L80. It is that the lining is collapsing ,we have proven this. From what I reading if that rod is not right length then reverse band slips or the reverse band drags. 3l4l80-e extended rear band servo piston rod fix for no reverse or Transmission 2wd 2006 performance high 4l70 duty heavy 2009 4x4 chevy ls1 rebuild mild gm off monstertransmission 4wd4l80e transmission 4wd, 4l80e 4x4, 4l80-e, 4l80, super duty 4l80e. 5L turbo diesel plow truck, put 27 miles on it and now it has no reverse. Thanks to: Broncocarl92 for his superior tool fabrication and explanation video h Dec 12, 2010 · Probable faults associated with no reverse. iqaw twuawb wyavuwv pcdrp ymxk qktbdd mojvfnh rwhfi abvrh zij