4l80e Lost Reverse

4l80e Lost Reverse17 bolt pan and cooling line locations as well as what came in my 1991 tells me it is indeed a early 4L80e transmission My plan of attack so far is listed below 1. May 19, 2018 by Jason One of the most common (and most frustrating) problems that happens to the 4L80E is when it loses 3rd and 4th gear at the same time. The Hydra-matic 4L80E is a 4-speed automatic transmission which uses electronic control for smooth shifting. How to fix No Reverse in GM 4L80-E GM Automatic Transmission Loss of R for FREE WHAT THE FIX 9. 4L80E stuck with only 2nd gear and reverse. Satisfied Customers Related Chevy Questions … satisfied customers … satisfied customers. I gradually lose reverse (it slips) when it heats up. 93 Chevy 3500 4L80E swap/ interchangeability?. This is not a permanent fix, but should get me through the. It may be (but is less likely) that the sun shell went bad as well. the "A" solenoid can cause a loss of 4th gear or a 4th gear that comes and goes solenoids can fail electrically or hydraulically. 4th will only work if the 2-3 solenoid gets enough pressure. Fluid was full but smells burnt and it. 4L V8 4WD AUTOMATIC 186,000 MILES Hi, so I pulled up to a stop yesterday afternoon and when I tried to pull away I had no forward gears only reverse. Got 3rd and reverse back. Anyway reverse it into the garage and check the fluid. Anyway reverse it into the garage and check the fluid. If there is an issue it may lay in the pump or solenoids. I checked the pressure in reverse at idle and it was delivering almost 300psi so I knew the oil circuit was decent. I backed it the half mile back home, had no issues with reverse. This time check filter to make sure wasn't clogged up. 2001 GMC 2500HD 4L80-E Reverse servo extension for a quick fix to get. Art4med. They tear the center out of the shell, which will cause it to spin on the shaft and lose reverse gear. We have absolutely identified the problem as defective band lining. 4L80E lost Reverse & Overdrive 4L8OE. It would almost seem likely there is two seperate issues. two problems with the 4l80e one could be line pressure, the other the 80e has a fail safe that wont let the trans shift to reverse if it senses a speed of greater than 8mph. I have heard issues with the relief valve in the pump on the 4L80E that can cause over pressure or under pressure problems. It would almost seem likely there is two seperate issues. Yes, reverse band failure is #1 reason for no reverse. 4L80E Reverse Servo Pin Fix How To + Boost Test Drive | 7875 Turbo 5. Note: if you happen to start in park and shift to reverse, it will squirt oil (big mess). It is pretty applicable to the 4L80E as well. to learn how to rebuild a 4L80e. did a partial fluid change after changing the filter. my 98 3500 lost overdrive and reverse would only work at full throttle (barely still yet). I have installed a good used 4l80e transmission in my 93 Chevy 3500 & have no forward gears, like the forward clutch is not engaging in the transmission. Current transmission from salvage yard ran fine for 2000 light duty miles. FIXED 4L80-E No Reverse or Slipping Reverse in GM Transmission. It weighs 146 lbs before transmission fluid is added and 162 lbs with it. But then again what was actually replaced on the rebuild? Has it been rebuilt? You could have a bad seperator plate on the VB that could be screwing with you. Maybe eletrical for the 4th gear problem and either a direct clutch or L/R band issue for rev problem. Helps cure: Direct clutch failure Delayed 3rd Delayed Reverse Code 87, 730, 756, 1811 No 3rd No Reverse Maximum line presssure No 4th 2nd Gear starts w/MIL on TCC slip codes Extreme Duty Forward Clutch Hub Kit 34322-02K Extreme Duty Input Shaft 34670-02 Shaft Material: Aermet. 17 bolt pan and cooling line locations as well as what came in my 1991 tells me it is indeed a early 4L80e transmission My plan of attack so far is listed below 1. 494 Posts Discussion Starter · #1 · Jun 5, 2019 (Edited) My 4L80E lost reverse after the turbos didn't spool due to a tuning issue & tight converter. How to fix No Reverse in GM 4L80-E GM Automatic Transmission Loss of R for FREE. 10-20-2020 04:28 PM by strutaeng. i would first unplug the main plug for the trans, it can leak fuild into the plug and short the pins and cause all sorts of problems. 4L80e "early design" into GMT800 1500. 4L80E Rebuild questions (that have not been covered)!">4L80E Rebuild questions (that have not been covered)!. 4L80 lost reverse and 3rd partially. FIXED 4L80-E No Reverse or Slipping Reverse in GM Transmission. So I am working with what I believe is a stock 4l80e 2002 transmission with approx 130,000 miles. 4L80E NO REVERSE EASY FIX?. 4L80E lost Reverse & Overdrive 4L8OE M motor posted 17 years ago Hello, the vehicle is a 1993 Chevy 1 ton diesel 6. Forward gears are more or less ok but when it comes in 3. 4L80E no reverse no overdrive 7743 Views 5 Replies 3 Participants Last post by sean1k7 , Aug 24, 2014 C crockettbomber Discussion Starter · May 28, 2014 I lost reverse backing out of my flat driveway no clunk or any grinding noises, it just slipped into neutral. 4l80e 454, 1993 silverado,">Lost reverse and overdrive. The transmission has a pressure port located on the driver's side above the pan. Fluid is red with no abnormal smells. It will shift from 1-3 because second is forced and 1 and 3rd are done by solenoids. Satisfied Customers Related Chevy Questions … satisfied customers … satisfied customers 1998 chevy truck: gears. Diagnosing the Elusive No Reverse with the 4L80-E. 2 (non turbo) with 4L80E electronic overdrive transmission. It is known to snap where the splines meet the shell itself. So about 3 months ago, lost reverse and 3rd. I got it out on the road and I also lost overdrive. 4L80E Problems: No 3rd or 4th gear. In the case of "No Reverse," the players inside the transmission are: Direct Clutch (also used in 3rd and 4th gear) Low/Reverse Band (also used for engine braking in manual 1st gear) Knowing this, we want to test the line pressure while in Reverse, 3rd gear, 4th gear and in manual 1st. Could the problem be in the valve body - Answered by a verified Chevy Mechanic We use cookies to give you the best possible experience on our website. there is no oversized solenoid for the 4l80 trans. Your 4L80E Transmission Has Faulty Valves Diagnosis of the 4L80E system shows that failure of valves is yet another cause of the no reverse malfunction. Get a pressure gauge and hook it up. 400/4l80e loss of reverse after rebuild. Rebuilt 1996 4l80e - No reverse Davester, Thanks for the replyin response to your questions: I had a shop rebuild it but they are 100 miles away, so before I yank this pig back out I want to make sure I'm covering any issues I can resolve without pulling it. 5TD) did when, while it was in "Limp" mode from a bad ECM and thus running at maximum line pressure because of that, it blew out the face of the Reverse Apply Piston and lost R, OD & 3. I have a 1994 Suburban 2500 with a 454 engine and a 4l80e. The 4l80e transmission is nice to. All forward gears work ok, although seem weak … read more Tim's Auto Repair Mechanic High School or GED 626 satisfied customers Stuck in first gear in speedometer isn't working, Well see I. All gears/shifting works great in both forward and reverse when vehicle is cold. I removed the valve body and used new acdelco gaskets and new separator plate from rockauto. A guy I know had weak reverse on his 4L80. It is assembler responsibility to check the servo travel/band. But sinds twoo weeks it has no reverse anymore. Good chance the converter in the 4l80e has problems at that mileage. If the valve is damaged, it becomes loose. Electrical malfunction of throttle position sensor or pressure switch manifold. Discussion Starter · #1 · Jun 5, 2019 (Edited) My 4L80E lost reverse after the turbos didn't spool due to a tuning issue & tight converter. So if you’re watching this video, chances are you have a 4L80E transmission and lost reverse. I let it cool, went to back up, it lurched about a foot and then no reverse at all. Tried manually shifting to 1st 2nd and 3rd and it would not move in any of those gears. I heard a bang when mine went out. You could do a low range drop, at about 20 MPH, to see if the L/R band can hold and provide engine braking. -Will manually shift into 1st, but in 2nd, D, and OD starts and stays in 2nd. 1 Location Huntington Beach, CA I have a 1045A2 with a 4L80E transmission. The bigger problem is that when I manually shift the trans from under the truck I cannot get any reverse. A torque con- verter clutch automatically engages at cruising speeds to improve fuel efficiency. 4L80E transmission, very weak reverse, accessive rpm to get Second opinion] 4L80E transmission, very weak reverse, accessive rpm to get it to move at all. 4L80E electronic. Reverse selects perfect but that is a mechanic… read more GM Tech (Cam) GMC Mechanic Vocational, Technical or Trade Scho. Common 4L60E Transmission Problems: Diagnosis & How To …. Brake switch malfunctioning due to poor connection, no signal to PCM or pinched wire. 4l80E has reverse no forward gears. 2004 chevy 2500hd with the 4l80e. Hate to say it, but it sounds like you either cracked the reverse piston or broke the reverse band anchor off. Just though I would pass this along. The vehicle will only operate in reverse. 4l80E no reverse when vehicle heats up. Driving without problems for 8 years a 3500 K dually 6. Both of which are fairly common problems on early 4L80E's due to pressure spike problems that were corrected in later units. This leaves you driving around a car or truck that screams down the road. My 4L80E lost reverse after the turbos didn't spool due to a tuning issue & tight converter. It's pretty obvious that no reverse and no engine braking in low is caused by the band not grabbing the reaction carrier. 4L80E Transmission Problems. GM claims that the factory transmission fluid should last the entire working life of the product. 4l80e that lost reverse all forward gears are fine the band ">4l80e that lost reverse all forward gears are fine the band. I gradually lose reverse (it slips) when it heats up. 9 times out of 10 when a 4L60E loses reverse it's due to the failure of the reaction sun shell. Make sure the pressure gauge is rated for at least 350 psi. Lost reverse 4L80E 3500 dually Nov 18, 2011 3500 dually Member Messages 79 Reaction score 3 Location Peculiar, Missouri Nov 18, 2011 #1 Ok, I need. Sometimes it’s an issue inside the valve body,. 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. Deeper still is the direct clutch or overdrive roller clutch failure. Started it up and put it in drive and it wouldnt move. The Computer commands this clutch through the torque. It offers a fourth gear overdrive to increase fuel efficiency. No reverse now -not even a hint of reverse. If there is an issue it may lay in the pump or solenoids. All forward gears work perfectly. So its throwing the 2-3 solenoid and tcc codes because when the fluid is hot it can't create enough pressure and thus can't stay in torque or 4th. The pump was a reman unit they said already has a sonnax boost valve, which I believe (good rep seller from Ebay) The Trans failure was clutch slipping - not enough shift pressure. 4L80E Rebuild questions (that have not been covered)!. 10656 Views 17 Replies 10 Participants Last post by screamingchief , Aug 31, 2011 C chris718 Discussion Starter · Mar 6, 2011. 4l80e 454, 1993 silverado,. All forward gears work ok, although seem weak … read more Tim's Auto Repair Mechanic High School or GED 626 satisfied customers. On a flat road it go,s a litle bit reverse. Rebuilt 1996 4l80e - No reverse Davester, Thanks for the replyin response to your questions: I had a shop rebuild it but they are 100 miles away, so before I yank this pig back out I want to make sure I'm covering any issues I can resolve without pulling it. The problem is not in the direct clutch when you have 3rd. Ok, the Vehicle is a 1999 Chevy 3500 HD. There's an aftermarket heavy duty sun shell available for them. You could try a replacement lockup solenoid. This found in YT video noted upper right in photo: If your 4L80E was built before 02/14/96, there’s a correction needed in the VCM for a “bad/weak internal ground” affecting 1-2 upshift and/or 3-4, or no 3rd or no 4th; launching shudder, possibly with a code P1820. A reliable and orderly diagnostic approach is splitting the circuits. 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. NO chunks of gear teeth or any other material and just a little fine metal shavings on the magnet. 2004 chevy 2500hd with the 4l80e. 4L80E no reverse no overdrive. It does have tranny hold back when put in first and letting off the gas at 25mph. Lost all forward gears but still have reverse. 3 LS powered S-10, aka: The Blue Ghost. 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. Pullled pan off and good clean fluid in it. Been fine up until a bout a week ago. 4L80E no reverse no overdrive 7743 Views 5 Replies 3 Participants Last post by sean1k7 , Aug 24, 2014 C crockettbomber Discussion Starter · May 28, 2014 I lost reverse backing out of my flat driveway no clunk or any grinding noises, it just slipped into neutral. Driving without problems for 8 years a 3500 K dually 6. Diagnosing the Elusive No Reverse with the 4L80. I've read that this is known as fail safe mode. 03' 4l80e Lost Reverse and sluggish shifting suddenly. Yes, reverse band failure is #1 reason for no reverse. I drained the pan, replaced the filter, filled it back up. Once the servo is out, you can manually apply band and try to tell if it is broke. Other web sources tell me that either the reverse gear servo piston or the third gear /reverse clutch drum assembly or the reverse band are most likely to be the guilty culprits. On a mildly chilly morning, my 95 c2500 6. The 4L80E usually came behind the higher horsepower 2500 HD Silverado and Sierra twins. If I let it cool, all is good again. No reverse is normally a broken band or cracked apply piston in early units. 12-10-2020 10:33 AM by kingtal0n. Anywho, lost reverse, all the forward gears are fine, fluid is normal, not foamed or burned. 4l80e losing overdrive after transmission warms up. I can handle getting these assemblies out. Just though I would pass this along. Sep 28, 2014 Messages 48 Reaction score 24 Manually shift '93 4L80. 1made it to Australia and has lost reverse. Loss of All Forward Gears, but Still Has Reverse. Studying all week I've come to the conclusion the forward clutch is the center of the failure. When certain hard codes are set, the PCM will delete the use of over drive. Several units I built and in car tested here at the shop lost reverse in out test car. The dealer told me I could replace just the band for about $700 or rebuild the whole tranny for about $1500. It does this to protect itself from further damage when it believes that there is a potentially fatal error. In 4L80-E units, part can be used in either early or late-model drums. Lost reverse and overdrive. i sent the diesel trans out to get rebuilt because I had already brought the stage 2 rebuild kit …. 2 diesel from ,91 now ,tranny 4L80E. Proof of 4L80-E Extended reverse servo piston rod allows band to fully grip again. I have 4l80e that lost reverse all forward gears are fine the band is good. 4L80E transmission, very weak reverse, accessive rpm to get Second opinion] 4L80E transmission, very weak reverse, accessive rpm to get it to move at all. 5 TD (4L80E) reversed 2 feet and all of a sudden, felt like a fuse popped. The 4L80E usually came behind the higher horsepower 2500 HD Silverado and Sierra twins. It's pretty obvious that no reverse and no engine braking in low is caused by the band not grabbing the reaction carrier. 0L Iron Block, i recently swapped my original 4L80E for a diesel because my the old trans a lot of the hard parts had serious overheating on the surface with just surface cracking and i lost reverse gear. 1996 4l80e, fresh rebuild, no reverse. Limp Mode If the 4L80E is only working in second gear and reverse, then it has gone into limp mode. So I’m told I can only use one from a 2wd. But sinds twoo weeks it has no reverse anymore. 12K subscribers Subscribe 242K views 4 years ago 2001 GMC 2500HD 4L80-E Reverse servo extension. Automatic Transmission Diagnosing the Elusive No Reverse with the 4L80-E Diagnosing a shift concern can be easy, as long as you understand some basic techniques to help get to the root of the problem. The function of the booster valve is to propel the gear when in reverse. Drivetrain Transmission Reverse Loss of all forward gears, but still has reverse K. If it does then you just ruled out the rear band application. The 4l80e transmission is nice to have in This time on SPPTV Rob works some more on his 7875 turbocharged junkyard 5. I have a 2000 van with the 4l80e, no forward gears but reverse works. That band actuates in reverse and first gear. Lost reverse and overdrive. All gears/shifting works great in both forward and reverse when vehicle is cold. I ran into this problem maybe a month ago. The apply chart tells me that the only likely problems are 1) forward clutch and 2) low roller clutch. Trans temp was 205 degrees when I got back to the pits. 4l80e that lost reverse all forward gears are fine the band is good. Automatic Transmission Diagnosing the Elusive No Reverse with the 4L80-E Diagnosing a shift concern can be easy, as long as you understand some basic techniques to help get to the root of the problem. So about 3 months ago, lost reverse and 3rd. Let off the gas pedal to see if the transmission feels like it is attempting. -Checked continuity with wires -Hooked up scan tool, no codes present ideas? Apr 20, 2010 #2 jakeshoe. The other morning i went out to move one of our plow trucks. com/_ylt=AwrEqsy46WZkUtsG0L5XNyoA;_ylu=Y29sbwNiZjEEcG9zAzMEdnRpZAMEc2VjA3Ny/RV=2/RE=1684494905/RO=10/RU=https%3a%2f%2fcararac. 2006 Chevy Silverado Transmission Problems. The PCM sends the proper signals to the transmission. I have a 2001 Silverado 1500HD with the LQ4 6. It is this clutch that provides the mechanical coupling from the engine to the transmission. Vehicle with 4l80e transmission comes back after 5 months with no reverse and problem with forward gear. Diagnosing a shift concern can be easy, as long as you understand. It didn't feel like it but it was 12 plus seconds on the brake. My 4L80E lost reverse after the turbos didn't spool due to a tuning issue & tight converter. The other morning i went out to move one of our plow trucks. 2 (non turbo) with 4L80E electronic overdrive transmission. No reverse now -not even a hint of reverse. Huntington Beach, CA I have a 1045A2 with a 4L80E transmission. Second opinion] 4L80E transmission, very weak reverse, accessive rpm to get it to move at all. Could the problem be in the valve body Ask an Expert Car Questions Chevrolet Repair 4l80e that lost reverse all forward gears are fine the band is good. 24 Manually shift '93 4L80. 4L80E – Jake’s Performance">4L80E – Jake’s Performance. at first it will start out going into reverse slow but will go into it and dont slip, but after a while i have nothing at all in. 5 TD (4L80E) reversed 2 feet and all of a sudden, felt like a fuse popped. 4L80E no codes, no reverse, all forward gears great!. 4L80E No 4th and No Reverse. I ran into this problem maybe a month ago. Electrical malfunction or damaged rotor teeth of output speed sensor. The Stage 4 4L80E adds the billet intermediate shaft. -Swapped ECM as I had a spare laying around and it didn't fix it. Drove it for about 3 miles, pan was leaking. The servo is definitely a possibility. Vehicle with 4l80e transmission comes back after 5 months with no reverse and problem with forward gear. 4l80e that lost reverse all forward gears are fine the band. No drive and no reverse 1st. Re: 4L80E lost forward gears. 2 diesel from ,91 now ,tranny 4L80E. Incorrect or non original axle ratio or tire size. How to fix No Reverse in GM 4L80-E GM Automatic Transmission Loss of R for FREE WHAT THE FIX 9. The 4l80e transmission is nice to have in This time on SPPTV Rob works some more on his 7875 turbocharged junkyard 5. Start the vehicle in Neutral with the parking brake applied (this helps in preventing the mess) and quickly shift to reverse to verify whether the band is holding with engine load. Hello, the vehicle is a 1993 Chevy 1 ton diesel 6. if it is not the rear band then place the shift selector into first gear manual and see if it will go forward. I backed it the half mile back home, had no issues with reverse. Proof of 4L80-E Extended reverse servo piston rod allows band to fully grip again. Reverse has a gear ratio of 2. In 4L80-E units, part can be used in either early or late-model drums. The 4l80e transmission is nice to have in This time on SPPTV Rob works some more on his 7875 turbocharged junkyard 5. Hate to say it, but it sounds like you either cracked the reverse piston or broke the reverse band anchor off. No reverse? 4L80E? 15493 Views 4 Replies 4 Participants Last post by SJ OFFROAD , Nov 30, 2006 M Matty Discussion Starter · Nov 5, 2006 Ok, the Vehicle is a. Lost reverse and overdrive. I also bought a new accumulator gasket and servo piston …. New to the forum but thanks in advance for any help. com%2fblog%2f4l80e-no-reverse-problem-solutions. 4l80e 454, 1993 silverado, thinking of replacing the tranny with rebuilt, no - Answered by a verified Chevy Mechanic We use cookies to give you the best possible experience on our website. Manually shift '93 4L80. Hard shifts can break the forward apply piston and roller clutches as. So if you're watching this video, chances are you have a 4L80E transmission and lost reverse. Ok, the Vehicle is a 1999 Chevy 3500 HD. 3 LS Bagged S10 Wrenching 29,721 views Jun 19, 2019 This time on SPPTV Rob works some more on his 7875 turbocharged junkyard. I have 4l80e that lost reverse all forward gears are fine the band is good. So I am working with what I believe is a stock 4l80e 2002 transmission with approx 130,000 miles. 4L80E Reverse Servo Pin Fix How To + Boost Test Drive | 7875 Turbo 5. Discussion Starter · #1 · Jun 5, 2019 (Edited) My 4L80E lost reverse after the turbos didn't spool due to a tuning issue & tight converter. Time to learn how to rebuild a 4L80e. So, what causes the no 3rd gear or 4th gear problem?. Having no reverse can be a tricky issue, especially if you happened to park against a wall. Yes, reverse band failure is #1 reason for no reverse. The torque converter has a torque converter clutch. Read more about the 4L60E from Novak Conversions. Reverse Loss of all forward gears, but still has reverse K. 4L80E stuck with only 2nd gear and reverse. 4L80E Transmission Troubleshooting Guide. 4l80e no forth or overdrive. Both of which are fairly common problems on early 4L80E's due to pressure spike problems that were corrected in later units. The problem is not in the direct clutch when you have 3rd. Just put a new reman 4L80E in and found out that the shifter shaft isnt long enough for my MLPS. There’s a whole article on this site dedicated to diagnosing no reverse in the 4L60E. Hard shifting is bad, so I'm going to guess you have a problem in the center support area. No Reverse Issue my 4L80E 27128 Views 14 Replies 6 Participants Last post by Madspeed , Jul 19, 2011 O old377guy Discussion Starter · May 14, 2011 Hi Guys, I just lost reverse suddenly and quietly in my 1994 K3500 Dually 454. The 4L80E in my '92 GMC 2500HD pickup has suddenly lost reverse gear. This makes it reliable to approximately 1000 HP/TQ. if you see no fluid try to drive it with …. Like Irish said, the low/reverse band is applied in manual low. 4L60E Problems: No Reverse. Reverse works fine. Automotive service technol 3,066 satisfied customers 4L80E transmission, very weak reverse, accessive rpm to get Second opinion] 4L80E transmission, very weak reverse, accessive rpm to get it to move at all. Results 1 to 10 of 42 Thread: 4L80E No Reverse! Thread Tools Display 08-22-2009 09:51 PM #1 Kros383SS The Neverending Project! Join Date Aug 2007. It will work at higher power levels if the RPM is less than 7000 RPM. 4L80e no reverse when hot Hi guys, i have a 4l80e that I built two months ago, when everything is cold all grears work great however when things warm up ( like driving for 20 miles or so ) I start loosing reverse. It is assembler responsibility to check the servo travel/band clearance. I have a 1045A2 with a 4L80E transmission. 4l80e that lost reverse all forward gears are fine the band is good. Just put a new reman 4L80E in and found out that the shifter shaft isnt long enough for my MLPS. 3,066 satisfied customers. If the valve body ends up warped, or if the gasket fails, it's entirely possible that the gear won't engage. lost reverse and 3rd partially. I've checked all the electrical connections and harness's. 4L80E lost Reverse & Overdrive 4L8OE. Initially I thought the splines on the input shaft had stripped but as I have reverse I think it would be the external splines. Before you rebuild, check for the price on brand new, I found there wasn't much difference and the new one had a 3 year/60 000 km warranty. Fluid was full but smells burnt. com">4L80E NO REVERSE EASY FIX?. Ok so I need to swap the shafts. My 4L80E in my 93 Chevy 3500 2wd lost reverse and I need to replace it or swap it. Question to be answered: Does it now have reverse? This is the messy test!. 4L80E transmission, very weak reverse, accessive rpm to get. 95' 4L80E only got 2nd & Reverse. html/RK=2/RS=KxIjx2Jo_ZiSVDHxHRzogMTPHoI-" referrerpolicy="origin" target="_blank">See full list on cararac. 4l80e 454, 1993 silverado, thinking of replacing the tranny with rebuilt, no - Answered by a verified Chevy Mechanic. 4L80E Torque Converter Mounting Pad Spacing?. I let it cool, went to back up, it lurched about a foot and then no reverse at all. They've been a weak link in the 700R4/4L60E's for years. Automatic Transmission Diagnosing the Elusive No Reverse with the 4L80-E Diagnosing a shift concern can be easy, as long as you understand some basic techniques to help get to the root of the problem. 4L80E Reverse Servo Pin Fix How To + Boost Test Drive. One of the most common problems with the 4L60E is that the reverse gear will go out. That tranny was burnt smooth up. GM Drivetrain & Suspension. Got 3rd and reverse back. Booster Valve- A bad booster valve can leave you without reverse in a hurry. No Reverse Issue my 4L80E. My 4L80E lost reverse after the turbos didn't spool due to a tuning issue & tight converter. This action makes it impossible to facilitate the reverse gear and cannot engage. The big round plug is plugged in and everything Ive read seems to me the MLPS not being present wont effect this. 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. the reverse gear may be the band as mentioned it may have been marginal set with a short pin or the servo cracked. This is COMMON on 4L80Es due to servo pin length and/or band diameter. If the problem is electrical then chances are you can troubleshoot the problem yourself. How to fix No Reverse in GM 4L80. -Checked for power at the ECM and checked grounds. After several applications at max line pressure the lining compresses and you lose reverse. What years of the 4L80E are compatible? Is there a different trans that can be swapped?. The servo is definitely a possibility. the "A" solenoid can cause a loss of 4th gear or a 4th gear that comes and goes solenoids can fail electrically or hydraulically. That band actuates in reverse and first gear. Once the servo is out, you can manually apply band and try to tell if it is broke. I'm pretty sure it's the 4L80E but not positive. Most 4L80E's I have had rebuilt cost around $1100 in and out at a local shop and need things like sprag clutches and OD gearsets that add to that cost number. by Steve Smith » Sat Apr 17, 2010 2:53 pm. I know the shifter is going to the reverse position correctly as the reverse lights come on. 4L80E lost Reverse & Overdrive 4L8OE M motor posted 17 years ago Hello, the vehicle is a 1993 Chevy 1 ton diesel 6. Question: 4L80e no reverse when hot. Once that was gone, the piston overextended and lost the seal, but not before a couple of the pieces of the washer wedged the clutch engaged, and I fried the entire front clutch pack! Overall the tranny disassembly was cake!. Sounds very similar to what my 1994 4L80E (behind a 6. How much stronger is the 4L80e Vs a 4l65e (1 2) Yukon04 on 09-13-2011. When the reverse band busts, you usually feel it, almost like sledge hammer hitting your rear bumper, very common for the reverse band to fail on the 4L80E. LOST REVERSE IN MY 99 CHEVY K2500 4L80E. the reverse gear may be the band. 4L80E no reverse after transbrake. 4l80e Transmission (No Reverse and Problem in Forward Gear). It could be a worn reverse servo seal. Cracked servo does happen more often than the ol t-400. Yes, reverse band failure is #1 reason for no reverse. There is no short in the wiring. 400/4l80e loss of reverse after rebuild. Lost the bellville washer return spring in the forward clutch packs - cracked it into 10 pieces. Sun Shell- A broken sun shell will cause the 4L60E to lose reverse. Now if I disconnect the wire harness to the transmission the vehicle will operate now in third gear and reverse. If you shift into first gear and experience no slippage and it runs fine then you have to redirect your energy elsewhere. The last few weeks I heard a grinding noise each time I started the truck but I thought it was the starter. All forward gears work ok, although seem weak … read more. 4l80e 454, 1993 silverado, thinking of replacing the tranny with rebuilt, no - Answered by a verified Chevy Mechanic We use cookies to give you the best possible experience on our website. I’m having a really hard time finding a Transmission and every shop I talk to tells me something different. 4L80E TRANSMISSION (NO REVERSE AND PROBLEM IN …. It was a metal band that broke that runs reverse and overdrive. I had the exact same problem with my 4L80E in my last truck. Under a mild load in the -30 degree and snowbank. No Reverse – Most of the time reverse won’t engage when the clutches are worn out. You can pull it out and check it with pan removed, may need to loosen or. The 4l80e transmission is nice to. Diagnosing the Elusive NO REVERSE with the 4L80-E Step 1: Split the Circuits "Hydraulically" When dealing with slipping, chatter and/or individual shift failures, it is Step 2: Split the Circuits "Electrically" Splitting the circuits electrically is a very basic step in the "No Reverse" Step. Fluid was full but smells burnt and it is …. 494 Posts Discussion Starter · #1 · Jun 5, 2019 (Edited) My 4L80E lost reverse after the turbos didn't spool due to a tuning issue & tight converter. wiebe1 Discussion Starter · May 10, 2007 Hay there,please help me out. 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. Try putting the shifter in manual low then drive forward to about 5mph.