Thanks for sharing. If I push the go pedal too much, it starts sounding like nuts and bolts in a blender. When going into reverse it makes no difference if I double clutch or not. After it warms up I have to revv the truck in reverse to get it to move. broke tranny mount again, so i planned to drive it very nice until i had a chance to replace it again. Could there be slop in something causing this? It does have the push button 4x4 which I believe is a special transfer case. Jun 12, 2018 · Applied brakes, pulled over, grinding stopped as soon as it was shifted through the gears, back to driving. Universals are good. Reverse works fine. The early design is cast aluminum and was installed in 1991-1995 models. It goes in to drive nice and soft, but reverse is another story. so as im going through a mud patch i start to get stuck so i let off the gas wait for the truck to stop to put it in reverse when i shift into reverse i hear a grinding noise and when i go to give it Oct 22, 2008 · The truck 6. What can this be? The fluid is clean, with no burn smell. When this happens, you’ll usually hear one big clunk as the starter tries to move. A new TH400 reaction carrier is shown in Figure. It has a very very, barely noticeable jump when shifted into first, but like i said, BARELY noticeable. Sep 25, 2022 · Your 4L80E Transmission Has Limp Mode. Try not to run or drive the car or further damage could result. Bought it 2 weeks ago. 48:1; Third Gear: 1. I have also changed the fluid. 5td 4x4 with 4L80E tranny to shift into neutral while driving it happened just for no reason this evening while in drive at about 55km/h it went into neutral and both drive and overdrive would not get me moving i came to a complete stop put it into reverse and it worked then i put it into drive and away i went to get back home with no other problems any ideas? Oct 14, 2018 · Truck was running and driving fine. 1992 GMC 2500, GVW 8600 2wd 4L80E auto tranny F engine 6. This valve body is available with and Dec 15, 2009 · 95' 4L80E only got 2nd & Reverse Jump to Latest 18K views 18 replies 6 participants last post by moviking Feb 15, 2010 Dec 3, 2007 · I have a 1994 6. It doesn’t have a tps. I will say, I just went out and checked it and it did fine a few times and then started the stalling Dec 12, 2010 · Probable faults associated with no reverse. I discovered that I installed the sprag counterclockwise. Oct 30, 2021 · On a mildly chilly morning, my 95 c2500 6. 7L v8 with 140k on it ive only had it for about a week. Reverse fails: on to the mechanical test! So far here is what we know in helping to find the "no reverse" issue. I only use it to plow, and it never leaves my property so it lives in 1st and Reverse almost all the time. If reverse is slow to engage, and line pressure does not come up to at least 130psi in reverse, replace the boost valve with a Transgo 0. Apr 16, 2010 · There are 3 different length reverse apply pin lengths. Rear band fault: • wrong band apply pin • Band worn 5. Most notably the PRNDL is not a 7 position like most older overdrive transmissions. Jun 14, 2022 · POR-15 is great stuff when used correctly. Nov 14, 2018 · I looked on rockauto and a new rear/reverse band is under fifty dollars. Transmission gears are typically robust, designed to withstand substantial friction. Jun 19, 2007 · pull in and out of the driveway 10 times great, on try 11 truck starts surging in reverse --kind of like the engine is responding to a load, and trying to accelreate, keep foot on brake engine sounds like it might die--shift to neutral and everything is a-ok back to reverse and surging starts again -switch to drive and it goes forward as it should. So, what causes the no 3rd gear or 4th gear problem? Below are some common things that fail in the 4L80E and cause this problem. Reinstalled it, started the engine again, still no pressure in reverse or forward on the gauge, but the tires would turn? I was told to change out the pressure control solenoid prior to removing the trans to see if that would fix it. C. Never been changed that I know of. If only measuring the #5 channel blocking the filter out it still reads 14. Apr 6, 2010 · Ive got about 3000 miles on my tko, and some days its just fine. Feb 3, 2013 · the noise you describe is quite common on these trucks especially with higher millage. . I corrected it. 48:1; Second, 1. I had some issues with the the truck when slowing down from 4th gear to 3rd gear (around 45-50 mph) the tranny was slipping and doing a grindding noise while exiting from the highway. May 7, 2009 · hard shifting 4l80e Hello, I had the same sypmtoms, with my diesel pickup, turned out my service trottle soon light was broken, pcm set default mode. And yes, he says it dies right away when shifted into reverse. however without hearing the noise its hard to say if its an abnormal noise or not. 4L80-E, 4L85-E Line Pressure Booster Kit 4L80E-LB1. Still, no reverse. See Figure. Best thing to do is take it to a reputable dealer/shop who has a Tech II or equivalent. Shift linkage is correct. This condition is worse when hot. It isnt just 400 4l80e. Did it one more time before getting home (this time in D in third gear) so I parked it. Transmission started grinding in 1st & Reverse. It is simply random, and more often than not that it grinds and doesn't go into gear. Sep 6, 2015 · The gauge still reads 0. When dealing with a 4L80E transmission with no reverse, consider a full rebuild process. Oct 24, 2023 · Picked up an 02 gmc 1500hd 6. May 27, 2018 · No reverse is normally a broken band or cracked apply piston in early units. Both when starting in OD, 3rd, 2nd and 1st. When I reached the top of the hill, I noticed I had no reverse. As this evolved it got to the point where shutting the engine off and on wouldn't correct the "No OD" At the moment I have No OD or lockup and now the trans is slipping in reverse. Since getting the truck back, when shifting into reverse, there is a delay before engagement of approx 2-3 seconds. Mar 11, 2017 · It hits hard enough that the front driveshaft makes a clang sound. I dropped the pan for inspection and found no metal laying or fragments on the magnet. Mar 7, 2018 · Shifted fine and held all gears just slow reverse engage holds fine. Took unit apart and everything looked perfect except the reverse band was burnt, which really hasn’t been a problem with these. 08:1. Red and not burnt at all. 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. Nov 10, 2014 · I am having an unusual problem, I have a 97 4l80e the gearbox is fine through all the gears and the tcc lockup is fine and works as it should in 4th gear. Case Material Jun 4, 2021 · 4L80e Saturday challange. I have driven it (on gravel) in all 4 positions for over a mile, driven in reverse for several hundred yards and still nothing seems to work. and it does the same thing. This is not a permanen Nov 28, 2012 · i bought a 97 trans am with the lt1 and 4sp auto with 107,000 miles. Dec 22, 2002 · If it is grinding when you are trying to shift into reverse, that tells me that the clutch is not completely disengaging. Problem: When reverse is selected, a horrible grinding noise occurs and doesn't stop until a different gear is selected. no grinding noises at all, just acts like its in neutral in all foward gears. Under moderate acceleration in reverse there is a shudder along with slipping. 48:1; Third, 1. It could be a sign of a serious issue, or it could be a minor issue that can be fixed easily. On the second test drive the trans would stall the engine at times but not every time when shifted into reverse or drive. We Aug 17, 2014 · 4l80E chatters & slips in reverse. If max pressure is low, check Electronic Pressure Control (EPC solenoid. The transgo -3 kit was intended to allow straight manual control. The only way to retrive trouble codes is with a scanner such as Tech 2 , snap-on, otc or equivelent. Grinding noise when the car is in reverse is a sign that something is wrong with the vehicle. May 27, 2019 · Vehicle with 4l80e transmission comes back after 5 months with no reverse and problem with forward gear. The same problem with or with out a load. This may be part of the reason why the TH400 drum surface wears at a much greater rate. replaced bulb, also take of battery poles for a minute, and everything works great again, When you startup your rig, and service trottle soon light don,t light up, you know Dec 22, 2022 · The truck is a plow truck and has been all its life. The manual valve directs oil to the reverse passages , not the shift solenoids. Not sure its even had a transmission fluid and filter change. Electrical issues can be eliminated easily with a simple test. The shifter is adjusted using the 1/4" dowel procedure. May 19, 2018 · 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. 00:1; Fourth, 0. Makes a winding up noise then engages reverse not loud just sounds different. 4l80e Transmission Specs . It will stay running if I give it a little gas while still having foot on the brake. Dec 8, 2009 · Some vehicles can lock out reverse if there is a speed signal from the VSS during reverse selection. No electronics. light duty trucks for 1991. R&R. I also transferred the rebuilt pump from my remanufactured 4L80E to it. Jun 5, 2023 · I just installed a new trans and filled it with fluid. #1 Worn low-reverse clutches which would need a rebuild. Simply plugging the Reverse Feed in the Case is a tried & true method & doesn't cause much more leakage than what was there from the factory. Features: Designed from clean sheet of paper Works Well on the Street and at the Track Direct replacement for 1991 to 2010 4L80E Full Manual Reverse Pattern No Shift Computer Required No Moving Parts No Electrical Parts for Shifting Retains Lockup Function (Optional) Engine Braking Backs up from Reverse Shifter Position Apr 19, 2020 · Fluid level is good and in good condition. The forward frictions are engaged in all 4L80-E transmission gears except reverse. Still no reverse. Hard shifts can break the forward apply piston and roller clutches as well as rip the band anchor loose. Dec 31, 2007 · Yes , you are wrong for reverse in this 4l60e trans. 75 :1; They determine how well the whole transmission works. If your apply is a little sluggish, then pulling it will make it quicker. You would not expect a GM unit but this is a charged 6 cylinder that needed the 4L80 over the ZF 4 speed boxes due to the 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. I added a gallon more and tried shifting through the gears. If it is slipping in all gears, it's either low fluid level, plugged filter, or pump failure. Installed today and It moves forward in all gears including park. everything worked great, tranny never slipped, never clunked, no weird noises then i broke a tranny mount. 5td 4l80e -95, but the truck slips on D, so i ordered a rebuild kit and replaced the frictions disc. The factory forward clutch hub is often found destroyed in many applications, resulting in a no forward condition. 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. Let’s now get into what counts: different gear ratios in the 4L80E transmission. Low fluid level. When energizing solenoid B air flows into direct case passage as well. No reverse now -not even a hint of reverse. 1 being the shortest. 4L80E D1 Transbrake Instructions Installation of the Jake's Performance 4L80E Transbrake will require some internal modifications. If you turn off the truck while costing turn off the engine you gain all forward gears untill you hit 2500 rpm. 5/4L80E combo. It never happens when I'm driving it regularly. Jun 12, 2022 · Reverse works fine, but it will not shift out of 1st gear. Jan 7, 2019 · If a 6L80E, reverse is achieved via the low reverse clutch pack and 3-5-R clutch while 2nd gear is achieved via the application of the 1-2-3-4 clutch and 2-6 clutch. Just rebuilt my transmission during winter and just had a testdrive. Buy Now! Jul 27, 2016 · Nice write up. 2 diesel from ,91 now ,tranny 4L80E. Jun 19, 2015 · I have a Stage 2 4L80E built for my 2002 Hummer H1 that worked perfectly for the first 1000 miles. Nov 22, 2020 · 2. But sinds twoo weeks it has no reverse anymore. I can feel it slip into engagement and if I try to stop I have to hit the brakes extremely hard. well my truck and tranny have been running great up until yesterday. Automatic Transmission - 4L80 Jaguar 1st and R noise/grind issue - Good day gentlemen, we are a shop in Europe and we occasionally get an American unit in. A stuck or frozen starter can cause a grinding noise when starting your Subaru Impreza. I recently lost reverse. Hard shifting is bad, so I'm going to guess you have a problem in the center support area. I will likely get a kit with the solenoids in it. Oct 26, 2014 · This can be from. It will make the same noise in reverse if you use too much throttle to start out. The4L80E gear ratiosare: First, 2. Jan 1, 2012 · Reverse works: follow electrical diagnosis and check for speed references to control module; Reverse fails: on to the mechanical test! So far, here is what we know in helping to find the no-reverse issue. Forgot to mention, I've got the drive shaft out, u-joints are fine, diff spins smoothly and hanger bearing is smooth. Purchased a 93 2500 that did not have 4th gear or was starting to lose reverse. It stays in the same gear and wants to go forward. ) the trans is slow to engage in gear if you drop it into gear after immediately start it. Probable Faults: 1. Sep 27, 2003 · What would cause my '93 chev 6. #4 A busted sunshell could also cause this,but,it is usually accompanied by noises Mar 24, 2009 · 4L80 2nd and reverse only, wont shift. 75:1; Reverse, 2. Buy Now! 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 Aug 5, 2023 · Understanding the Full Rebuild Process. If i put truck in neutral and let rpms come back down then back into reverse it will be fine. "Park" works as normal I have checked the linkage, all that looks fine. The 4L80E uses the forward and intermediate clutch in combination with the intermediate sprag on the direct drum holding while in 2nd gear. Anyone else had the same problem? Apr 3, 2012 · At the time 1st, 2nd, 3rd and reverse worked normally. This happened on the first test drive. No noise in reverse, doesn't matter 4x4 or not. it only does it in drive once the truck reaches 10kph and immidiatly in reverse and it wont move in reverse at all not even try. Mar 6, 2011 · Without sounding like a kolotripidtha (ie asshole) I have a Very Precise means of checking the band clearance. My transmission while driving hard up a hill got stuck in the forward position in every gear. Jan 3, 2008 · If I use a very light throttle, it won't make any noise. Get The Best Prices New & Used 4l80e Transmissions . 500" boost valve Easy fix by removing the pan. May 30, 2007 · Sudden grinding noise with no prior warning primarily in 2nd gear, behavior in reverse may be abnormal; sunshell is fractured. Thread starter hockeyman; Start date Jan 27, 2016; 2001 Z28 1SC - LQ4 l SRD Cam l S480 l 4L80E l Circle D l 9 Inch Jun 7, 2012 · When I shift into reverse it takes a couple seconds to engage. I guess brake rotors are not alway staying flat. It did the same thing in reverse. If the 4L80E is only working in second gear and reverse, then it has gone into limp mode. This truck has 60k miles on it. When things warm up a bit it only has 1st and 2nd. Fluid was full but smells burnt and it Jul 18, 2011 · Hello I am new to the site and to deisels. A new 4L80E reaction carrier is shown in Figure. 2004 chevy 2500hd with the 4l80e. #2 Worn boost valve. They can determine why you might have the problems you are explaining about. there were no trouble codes when I got it. Dec 1, 2008 · L65-4l80e-4:10 axle-HD everything,Fleet order-moved New pmd to rear of front bumper with a heat sink. Some frequent problems for overdrive and reverse can be addressed in the stickies. 100 PSI of converter charge pressure generates 89 pounds of rearward thrust on the overdrive planetary gearset, forward clutch housing, and mainshaft. odometer not working transmission won’t shift. The trans. After replying to your PM I decided to post some of it here. So if I put it in second gear and then reverse and it still grinds, then I should adjust the cable some more? Mar 27, 2010 · If base pressure is low, the pump is worn out. 48, third gear:1:0, fourth gear:0:75, and reverse gear:2. No reverse is very common in the 4L60E. One would imagine that this component would be robust due to the nature of its application, but unfortunately it is not. Feb 4, 2018 · The second Jasper trans will at times but not all of the time stall the engine when shifted into reverse. Harley Speed Sensor Symptoms; By Sensor Guides. Hey guys, I have a 4l80e with a 3600 stall converter with 373 gears and a 228r cam. Sep 11, 2023 · 4l80e output speed sensor. Aug 21, 2010 · I have a 1990 f350 7. When energizing solenoid A, nothing happens. Feb 17, 2015 · I'm going to look at it this weekend but according to the owner it always runs fine even when warm until it goes into reverse. Can be replaced from the pan. The truck grinds when it is put in park. Pin Extender Reverse Servo 400/4L80E Transtar Part Number: T34913. I have a series of other problems with that one. and then go over to reverse and just slightly push it in and it starts to grind, no matter how long you sit there the clutch never stops spinning. Then it will start right back up. All the gears work fine except for reverse. Member #766 3500 Dually Club 10-01-09 sold! bought a 97 -ord-460, boy does it pull! May 8, 2011 · I just recently bough a 97 gmc sierra 1500 5. It is also glide and others. Thoughts and suggestions please. I feel like you would think that the drum being metal like a braje rotor would survive some heat. Mar 15, 2024 · A review of various gear ratios in 4L80E Transmission. Mine wanted to grind shifting into reverse. 00:1; Fourth Gear: . As far as I can tell it shifts through all forward gears fine (as tested in the air on jackstands) but when engaged into reverse, I get nothing. May 12, 2014 · Reverse at 2000 rpms - 270psi idle in basically all gears - 40-60psi 2000 rpms in all forward gears - 150-160psi WOT- 150-160psi The pressure test made me feel a little better. Apr 13, 2015 · Recently had the 4L80E (220k miles) in my 96 K2500 4x4 Pickup rebuilt by a recommended local Transmission Shop. Low Reverse Clutch Pack- The most likely part of the 4L60E to have failed in reverse is the low reverse clutch pack Mar 9, 2012 · Here we go. However, many have used 4l80e transmissions from all years and have had plenty of success with longevity and reliability in extreme use cases. Used the Frost/PCM of NC (Relay) Harness. 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. 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. Apr 16, 2013 · My buddy's 1/2 ton Chevy pickup when starting off in reverse has a grinding kind of sound. Transmission removed for inspection. Jun 24, 2008 · +100 on a hair more preload. i use it for plowing and sanding also hauling my 20' trailer. If 4wd is engaged, the clang is greatly reduced when putting in reverse. If you put it gear selector in reverse and accelerate it wants to go forward. Jan 22, 2012 · Reverse works: follow electrical diagnosis and check for speed references to control module. I have about an inch or so of clutch free play. There are 3 issues that have me concerned. Took the truck back to them to be test-driven and they say it's a normal thing. When the check ball seats as commanded by the computer then the fluid does not exhaust through the exhaust ports. I was a little surprised to see this complaint on this late of tranny because I knew it had a bonded rubber piston, which don’t break. I drained the pan, replaced the filter, filled it back up. We have a Jaguar XJR6 with a 4L80 in. Fluid is not burnt and perfect Oct 21, 2016 · Typical 4L80E converter charge pressure during high load is usually around 100 PSI, with a maximum line pressure of 180 PSI. Line-pressure issues can be eliminated easily with a simple test. Occasionally it engages smooth but only 1/5th of the time. You can unplug the 4L60e main trans case connector and the trans will shift to reverse (If reverse functions) I've worked on passenger car automatics for 3 decades and still do 5 days a week Dec 8, 2013 · 4L80E/TH400 FORWARD CLUTCH PISTON IDENTIFICATION AND INTERCHANGE There are early and late design 4L80E forward and direct clutch pistons. if I disconnect the harnesses a bunch of errors come up but that is because May 10, 2007 · Driving without problems for 8 years a 3500 K dually 6. on my way out to camp all the sudden my truck starts making this awfull grinding noise. D, when both solenoids off, air flows thru forward and intermediate case channels. This usually causes reverse to be slow to engage vs slipping,but,it is possible. Feb 17, 2015 · 4l80e flakey rev and commanding 4th when in 3rd Views 2K. Trans never been touched. Started it up and put it in drive and it wouldnt move. 5l with a 4l80e. This is the only 4L80E Pro Transbrake available and is a direct replacement for the 1991 to 2010 4L80E valve body. Codes can be cleared by Dec 19, 2013 · Reverse worked with both reverse band pin moving and direct clutch air flowing into the case. Is it shot or anyone have any ideas? I hope I didn't miss anything searching on Jun 5, 2021 · 4L80e Saturday challenge. No noise while revving in park or neutral. Reverse servo fault: • misassembled • Piston or seal damage 4. No need for selective pins, use the extender and grind to size. 5TD, torque converter lock up mod. The trans fluid does not smell or look burnt. Now i dont have any line pressure when i took of the cooler lines, and it wont move. Jul 30, 2016 · Hello All I need some help!! I have a 1999 Suburban 6. Shifter will still move through all the gears but truck will not move. Once up to about 30 - 35 mph no more noise, unless I downshift then noise happens. Even in neutral the case is in low. For those searching for a used 4L80E keep in mind that GM made a few changes in 2004 you need to know about. i have a push button with a latching relay & some resistors to make the converter clutch work with the brake pedal switch to unlock the converter, but that is it, all the other electrical controls are gone. I have a 2004 Gmc Box truck and the trans will go into reverse and is fine at lite throttle, but if I were to try to accelerate more to say back up a slight incline it starts to chatter and slip. If its too long you'll have to grind it to make it shorter or find a shorter pin, they have ID grooves on the tip , either 1 -2 or 3 rings. Slowed down to make a turn and truck lost power to the wheels and acted like it was put into neutral. Now it won't even reverse at fast idle, it clunks around 850 RPM, only will move in reverse with no throttle at warm idle. 07. Disconnected the harness from the trans. others it seems I can hold the clutch in, while in gear, no movement, put it into neutral. Sep 11, 2023 · 3. Dec 21, 2013 · The drum surface hardness of a production 1995 and up 4L80E reaction carrier is 20 RC. reverse is perfect though. *TIP. Thanks Rod Feb 4, 2023 · On the drive home, I noticed 1st gear has a grinding noise that instantly ceases upon shift to 2nd gear. All forward gears work perfectly. Dec 20, 2011 · it's not worth it. The gear will refuse to shift to reverse to protect the transmission system from further damage. Then I decide to rebuild my original 4L80E as a back up. Aug 9, 2011 · 4l60e reverse only thanks guys for responding. I installed a 4L80E as part of my LS swap and cut off both ears with a sawz all to facilitate header clearance. But before you try to adjust the clutch, shift it into a forward gear, such as fourth, then quickly shift it over to reverse. 10, Stock, took it over at 190,000 mi. Anyway reverse it into the garage and check the fluid. It works works well on the Street and at the Track. The fluid was brown and low. Shifts are firm like they've always been, temps are normal, no other symptoms. Sep 26, 2009 · 4L60E grinding in reverse Jump to Latest 12K views 11 replies 5 participants last post by 95BRMW Oct 6, 2009 Aug 7, 2017 · Upon looking at this chart, I would suspect that I am correct in thinking the low/reverse band is going. Jul 16, 2009 · I own a 1996 GMC suburban, 185K miles. Jul 2, 2018 · Removing reverse checkball is only for quicker apply of reverse. my truck i'm driving had 166,000 miles. 1. The late design is stamped steel with bonded rubber seals and was installed in 1996 and up models. The trans is in a forward gear at all times. If feels like I'm hitting a wall when I go from drive to reverse and stalls . GM/Chevy 4L80E/Th400 Transmission Reverse Band Fits all years If you need anything else for your 4L80E Rebuild, Shift kit, Rebuild kit, electrical, sprags, etc please see our store!!! Write Your Own Review Jun 8, 2016 · 4L80E moved a little I started the truck and let it run for a while. I then have to feather the throttle to get it to move. Tranny seems strong. I still have forward movement in OD, D, 2nd, and 1st. Direct clutch fault: Jun 18, 2012 · The OD roller is used for reverse, and for forward with the shifter in OD, however if you pull it into D3, D2, or Low it is not needed, the overruns will hold. Dec 19, 2013 · 1,Lo/reverse checkball is at 14hg-in. Thoughts on a fix for the oil flow? May 30, 2020 · For the life of me I cannot get the truck out of low range. Leak should be by the 2-3 shift valve? How it that assessed? Could those be my reasons, seems fair according to the Sonnax instruction sheet? Sep 7, 2020 · Hi guy's, I have a 2003 GMC Sierra 2500 HD with a 4l80e transmission with 120000 miles on it. 3 Turbo Diesel, Auto Trans(E40D), 4WD, 4. 2,Reverse checkball at 12 3,Afl filter passage #20/5 at 14 hg-in. Jun 6, 2002 · The reason it grinds going into reverse is because reverse does not have a synchro. When put in drive after 25 MPH it smooths out and runs flawlessly. Jun 11, 2014 · The lockup in reverse gets worse as the fluid temp gets higher, no issues until at least 180-190, and now the trans is running 15-30 degrees warmer than it did before. Remove #9 to bypass the metering orifice for reverse apply of the direct clutches. so, something is dragging it down. Neutral, first, second, third or fourth. I even went back to the factory piston (without the seals as it was prior) and spring. Well here is the problem , the car stalls while going in reverse . 5T 4x4 1 ton with 4L80E Truck will shift into neutrial in 4 th gear at around 55 mph but always at 2500 rpm. parked the car over night, the next morning i started it up, put it in reverse and Extreme Automatic's 4L80E Billet Aluminum Reverse Manual with Transbrake was designed from clean sheet of paper. It is full of bright red fluid. 5L 280K with a 4l80E backed transmission. This leaves you driving around a car or truck that screams down the road. Jan 22, 2012 · A vehicle comes into a shop after being on the road for nearly one year following a previous repair. Extreme Automatics 4L80E Billet Aluminum Reverse Manual Valve Body. 4L60E No Reverse Causes. May 10, 2015 · Hi guys, its been a while since iv last been on here. This process includes splitting the circuits to identify issues, rebuilding the valve body to ensure proper fluid flow, and replacing worn clutches and bands for optimal performance. make sure all your fluids are at proper level (diff(s) and transfer-case), and if its a quiet clunk then i wouldnt worry too much about it. This occurrence happens when the transmission system is damaged, and no corrective measures have been taken immediately. Jan 7, 2014 · New to trans rebuilding. This thrust may be enough to destroy the thrust washer, especially in vehicles with low final drive ratios and tall tires. This was a late-model 4L80-E (smooth band) with the shift concern of "No Reverse. I have tried numerous tricks and have yet to find a way to prevent the grinding. Stays at 205-210 on the highway, empty, where it ran 180 ish before this, and 210 towing 8-10k. In neutual it wants to move forward too. Does fine putting it in drive. 1st doesn't slip, just grindy noises that are about the speed of the driveshaft it seems. Drove it for about 3 miles, pan was leaking. It was probably already weak before today. M. #3Fluid leak in the apply circuit. Solenoid A did not do any difference. The problem is the band lining. Oct 2, 2016 · For 1 months ago i bought a Chevrolet Suburban 6. sensor guides How to replace speed sensors on the 4L80 transmission? Replacing the speed sensors (Input Speed Sensor and Output Speed Sensor) on a 4L80E transmission is a relatively straightforward procedure. Feels like everything has lost Jul 15, 2018 · One of the mods was to remove the piston and spring from the reverse accumulator and replace it with a very heavy spring. On a flat road it go,s a litle bit reverse. When it is up to temperature the tcc is locking up when I am in 1st ( or any selected forward gear) and reverse, the warmer the box the problem becomes worse. Whether you sit in park and apply throttle. And it doesn't grind in all the other gears because they all have synchros? Oh, also I have the steeda kit with the adjustable cable and firewall adjuster. This was checked with both several new and used versions of both parts. " It's important to note that this vehicle was an extremely overloaded truck used by a utility company. It stays running in all other gears, just happens in reverse. When he bought it the tranny was bad so he replaced it with a rebuilt unit. When I first start the vehicle cold I have reverse with no problem. I also beleive this 91 4l80e may have been rebuilt at one point. I purchased it cheap from a friend because it doesn't shift. Hot or cold doesn't matter. The gold ball included in the SK-4L60E shift kit also works for plugging the reverse feed on the Center Support. It features a Pro Tree Solenoid and designed for lightning-fast reaction. Sep 11, 2012 · When transmission is at operating temp in 2 wheel drive it will make this grinding noise but only while driving. Lately, the torque converter has been locking up while in 1st and Reverse both. Mar 19, 2015 · I did my first trans rebuild this week on a 4l60e that doesn't seem to want to work in the reverse gear. when I take the harness off I only get third gear. CumminsFever; Nov 12 GM 4L80E technical information The 4L80E transmission is a four speed automatic with torque converter clutch. After it shifts to second gear, all is fine. The 4L80E usually came behind the higher horsepower 2500 HD Silverado and Sierra twins. If the truck is in 3 gear (out of over drive same problrm is at 3000 rpm). 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. The truck attempted to move forward in reverse. This is a 1993 diesel work truck. May 30, 2017 · Even though the front gearset is only active in first and reverse, the reaction carrier generates a tremendous amount of rearward thrust when active, which is met with an equal amount of forward thrust from the output carrier. got it fixed, everything was fine. specially if I drove it around. I purchased a 94 2500 light duty 6. Dec 23, 2019 · Low line rise in Reverse; Required. The noise seems to be coming from the t-case. Worse at a fast idle. Aug 9, 2009 · The 4L80E, an electronic, overdrive-equipped version of the venerable TH-400, is tough enough to handle just about whatever hell you put it through when built properly. 3. OD is good too. Then suddenly will not into overdrive and when reversing (when the engine is hot) it shudders like it struggles to go into reverse. Jul 5, 2015 · No Movement. 4L80-E, 4L85-E The Sure Cure® Kit SC The 4L80e uses four forward gears and one reverse gear in the following ratios! First gear:2. 228,500 on the clock. Thanks Oct 20, 2009 · it is possible to only grind when going into reverse (different set of dogs, they will grab differently than the forward set) 14 sounds a tad high, if you have a gen 1, there is a throttle adjustment in the cable (about a foot before it gets to the throttle body) that adjuster likes to come loose and tighten up from vibration. Jul 7, 2012 · This is a non-efi car. 0L 4l80e no reverse, thought i could put the pin extender on and call it a day, still no reverse. Maybe eletrical for the 4th gear problem and either a direct clutch or L/R band issue for rev problem. Feb 19, 2013 · The other morning i went out to move one of our plow trucks. I tore it back down but nothing is looking wrong. Apr 16, 2009 · Right after I bought my LJ I started to notice that going into reverse was somewhat difficult and it would occasionally grind a bit. 73 rear end, underdrive crank pulley, overdrive alternator pulley, 411 swap with a custum tune, electric fan conversion, hypertech power programmer, viper push button starter, caddy cluster, 6000k HID Nov 3, 2016 · The dent throws off the balance of the driveshaft, so it'll cause a vibration through the drivetrain, and it also makes for a weak spot on the driveshaft. 1st and 3rd only, no 2,4 or R; sunshell is fractured or splines are sheared off. Dec 11, 2007 · 97 F250 XLT HD Supercab, LB, 7. Moves and shifts but acts like a rubber band. The AX15 has performed excellently with one exception: it consistently grinds going into reverse. Below we will cover the most common problems that cause reverse to fail. I tried manually moving the shift lever from 1 to 2, etc and it had no effect. fluid was so low it didn't register on the dipstick. Reverse is really firm!! Dec 27, 2015 · When reverse is selected a loud grinding sound that makes me cringe occurs (sounds like trying to put a manual transmission into gear without using the clutch). May 28, 2014 · Reverse is not commanded by any shifting solenoids. Nov 2, 2013 · Forward all gears work perfectly with no slipping or issues at all, once out of about every ten times backing up it feels almost like it kicks out of reverse and makes a clicking/grinding noise, rpms raise, goes nowhere. 4l80e slipping in reverse, grinding in 1st. 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. May 4, 2018 · Having no reverse can be a tricky issue, especially if you happened to park against a wall. De converter is correctly installed and right fluid is in the gearbox, i also have the codes 73, 81, 82, 83. Recently the grinding has become almost constant while releasing the clutch with the tranny in reverse. They do not sell the Reaction Carreir drum thing though. 3 IDI with the zf 5 speed. Trans conditioner/seal restorer such as Lucas may provide a temporary fix. I pulled the gauge and checked it with air pressure and it seemed to be working correctly. Required. Shift linkage loose, misadjusted or damaged. 🍻 Just rebuilt my transmission during winter and just had a testdrive. A 4L80E unit has four forward gears (forward drive) with one reverse: First Gear: 2. The tranny was rebuilt not too long ago according to the owner. I was gonna have the filter and fluid changed when I get home. Nov 21, 2023. Unlike the TH400, lube pressure doesn’t raise rearward thrust. But while the 4L80E is a strong, heavy-duty transmission, during the first few years of production the 4L80E was not as durable as its design permitted due mainly to faulty parts. 48:1; Second Gear: 1. It worked great but he forgot to put the seal between the tranny and transfer case so it leaked. Did not pressure check had to come out anyways because converter was way off. Oct 13, 2013 · Its a gradual slip, starts at 4000 and gradually builds till 4600 at which point its a logged 400 rpm slip between input and output speed of the trans so the converter would be out of the equation. It would almost seem likely there is two seperate issues. Regardless of the position of the lever, 4L, N, 2H, 4H the transfer case refuses to shift out of low. This is a computer controlled transmission first introduced in G. if on overdrive it will drive on third gear and overdrive will not engage, it will also drive on manual third and no movement on L1 or L2. A faulty reverse gear often tops the list when deliberating the grinding noise produced when reversing. When I put it in reverse, the truck stalls. New GPR, T-stat, new Torque Converter, rebuilt steering column, front pads/rotors, new rims, outer 4WD u-joints, both GP wire harnesses, glow plugs, valve adjustment, rear shoes and drums, 3 engine pulleys, upper & lower ball joints, theft deterrent device. Quick (temp) fix is to shift to a forward gear (5th is easy to hit) then reverse. I have zero shifting problems in forward gears, but even at a fully warmed up slow idle it grinds a bit shifting into reverse. Also put a bottle of lucas in and it helped. I just like to reduce leakage as much as possible. The 4L80E Transmission system is equipped with a computer called the Transmission Control Module (TCM), located in the left/rear passenger seat compartment which interprets, ana-lyzes and records electronic signals from sensors and switches located on the engine, brake pedal, and transmission. These are relatively simple but are best done during a rebuild or by a professional transmission technician. Since I never hammer it in reverse(as I know the 4L80E's weakness is reverse) and I rarely use engine braking I can understand why it didn't happen till yesterday. Jan 9, 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. If I put it in reverse or neutral it goes forward, like it is in drive. I replaced all clutch packs,pressure plates,bands, and cleaned thoroughly. Sep 6, 2016 · All of this extra room allows for added durability while retaining four forward gears and reverse. To my big disappointment it is slipping in forward gears. I come to believe it could be a pump? Im gonna drop the pan on sunday cause warm weather is a comin . it's worth more as a parts truck to me then worth driving. 5 TD (4L80E) reversed 2 feet and all of a sudden, felt like a fuse popped. Sep 10, 2009 · The trans has started to slip most noticably in reverse. I used the "peak" seals on the center support, maybe I should put the teflon ones on? I replaced the direct drum because it was scored up around that area, maybe the remaned part was honed out to big and the seals are not sealing? Feb 20, 2014 · GM's Strongest Four-Speed. The 4L80E sometimes moves to the limp mode, a self-preservation mode. Stuck or Frozen Starter. Jun 27, 2023 · When it comes to grinding noise in reverse, it’s important to understand the outlook on the issue. Wont hurt anything. Faulty Reverse Gear. ok no forward movement with harness on. NickTransmissions. Once that can is opened it is subject to going bad, but generally from moisture contamination that causes it to cure, skinning over on the top, etc. Reverse is really firm!! 1992 case, red alto and kolene steels, Transgo HD2 kit and internally Nov 18, 2011 · The latest 4l80E I’ve worked on was a 2000 with no reverse. Tried manually shifting to 1st 2nd and 3rd and it would not move in any of those gears. The outlook on grinding noise in reverse ultimately Once this occurs, you’re left with metal upon metal contact each time you brake, leading to the characteristic grinding noise. theres about a million things it could be but im kinda Mar 25, 2018 · The junkyard 4L80E that I swapped into my red truck has had the no reverse issue you describe a few times, but it only happens to me if the truck has sat in storage for a week or more. 2. Limp Mode. 5" crossover, 3"downpipe, 4 Apr 14, 2014 · -1997 k1500 ,ECSB, 350, built 4l60e with 2000 stall, air raid CAI, ported MAF sensor, ported throttle body, magnaflow catback with moroso spiral flow mufflers, flowtech shorty headers, escalade 3. The engine feels a load when in reverse. In Drive, you can feel that it is goes into drive and wanted to move in the direction, but now movement. If it then goes into reverse, it's the clutch needing some adjustment to allow it to fully disengage. It is that the lining is collapsing ,we have proven this. Went to back it out of the garage and no go. Is has often been debated all over the internet that a newer (99+) 4l80e is more capable than an older unit. Sounds like it’s coming from the torque converter area. Trapping a piece of plastic wrap between the lid and can when closing it up helps a lot, as well as not painting directly from the can, you have to pour the stuff into a container to paint from, and don't Nov 11, 2009 · I rebuilt this 94 4L80E & now it only has reverse & 3rd gear. it was a little responsive in all gears, but would barely move. New lift pump and IP, boy it runs alot better! Everything else is stock for now. 1st, 2nd and 3rd work normal when cold. Jun 27, 2017 · When driving about 40 miles or so and the trans is hot, it will just grind when trying to shift into reverse. The overdrive is a very frequent problem. I did drive the car about 1/2 mile and it seemed to drive and shift properly other than no reverse. But I found by adding a bit more preload it works flawlessly, I can shift into reverse at a roll and it doesn't grind Apr 4, 2021 · I also replaced the internal slave with an external slave bellhousing. Mar 5, 2010 · it makes no foward movement at all. so I Nov 7, 2023 · You recently got the 4L60E automatic transmission for your new pickup truck but now your vehicle’s 4l60e transmission won’t move in any gear! Pin Extender Reverse Servo 400/4L80E Transtar Part Number: T34913. While driving in 4x4 hi or 4x4 lo there is no noise. 5 1ton with the 4L80. Recommended. 48, second gear:1. No other shifting problems. last night i was at my buddies house and we were messing around in his pasture gettin muddy. ; The 4L80E transmissions were Just finished a 4l80e swap. Help guys. 8. Feb 7, 2008 · Ive got a 96 suburban, (labeled 2500, VIN says its a 1500) with a 6. wplr yxi kexzfls dchjthw nkbm qlir mvofvyj aobwhn nzo mjbrhyjn