You sure know your stuff. Being able to watch a trans broken down in ten minutes is incredible. It would take me a week to make sure i put everything in order.
Thanks Gary for sharing your knowledge with us. Very insightful and you prepared it such a way that made it easy for a rookie like me to understand. Guess that is why five years after you made the posting new people are still benefitting. Cheers!
Subscribed!!! Gary, your videos are very well done and educational! I am an auto tech, but have not rebuilt many automatic transmissions. I am currently rebuilding a 6l90e. I saw the tsb on this, but don't remember it mentioning the 1-4 apply piston, thanks for the tip. I did the air test, and yep, cracked drum! also watched your vids about tecm switches and valve body. You sir saved me and my customer time and money. Thank you for this great channel!
Wow, very informative for us 6l80e owners. I've blown a few of mine over time, along with engines and diffs. Drum cracking is interesting. Thanks for taking the time and posting. I had a full rebuild and new TECUM unit completed about 8 months ago and it's playing up berko already; and I feel its the pump or drum causing the problem as the shifts change a lot from one minute to another. This time around I'm inclined to go Circle D multi clutch billet converter too. I swear my Aussie made converter is problematic since day one. You have no idea of my frustration on this matter
turns out the transmission I have is a 6l90e , its out of a Dually 3500hd. Do you know if the 3/5 reverse upper drum that I got for a 6l80e will work on the 6l90e? its fully loaded with clutches.
I love this transmission I have a 13 Sierra 5.3 with the 6l80 60000 not a problem yet I've watched this video a dozen times thank you for all your skills I'll need them one day can't wait need a good reassembly video of one I can only find a bilingual video online alright but confusing can't wait
Great video. Our 2010 Tahoe w/ 6L80 lost all forward gears this morning. Reverse is strong. Did this one other time last week at a stop light but eventually kicked in enough to bark the tires. Does this sound like a stuck #1 check ball? What else should I replace while I have the valve body out? Gaskets & all balls? I didn't see where you disassembled the valve body to go over the separator plate. Thanks!
I have a 2012 GMC Sierra 4x4 and when its cold it will only shift from 1 to 2 nice then 2 to 3 there is a delay 3 to 4 is also nice then again 4 th 5 it has a big delay,after it reaches to like 110 it will work flawlessly thru all the gears till it reaches 160 or so 4th to 5th will have a little delay again also sometimes trans temp is around 50 cold start it won't have any reverse, drive or manual ,any ideas? And no codes are present
Does the 6L45 also experience this cracked 1-4/3,5,R drum? And if so, is it possible that the symptoms only occur at times and mostly when the transmission is cold?
My transmission acts like it is slipping if I kick it down or roll on the gas to hard or fast and it shifts hard sometimes from first to second sometimes from second to third I MEAN HARD LIKE TO THE POINT OF ME WORRYING ABOUT IT BREAKING SOMETHING. Anyone know if a shift cylinoid, a filter needing replaced, or the torque converter would cause this???? I hope I dont have to have the whole thing rebuilt. Fluid is full and looks and smells good. Any info would be greatly appreciated.
great video, I am a retired motor mechanic, not long ago I purchased Holden commodore ss which has a L77 and 6l80e trans fitted it is all working fine but I think in the future the trans. may need a rebuild, watching this video and others like it will be a great help. thank you.
Gary, I live in Australia on the east coast about 40k inland in a town named Abermain area code 2326 in the state of new south wales a great spot, like I said I am a retired mechanic I have a great workshop here at home I put in a to post hoist a while ago great piece of equipment I like to keep my hand in, as you know as you get older it gets harder to roll around on the cold concrete, I will be 68 this coming December, being 21 again would be good, I have really enjoyed my trade and would do it all over again, I did my apprenticeship at a shire council workshop when I was 15 years of age for 5 years, worked on everything from a push lawn mower to a d11 cat. it was a great place to start to learn my trade, I think you and I would make great neighbors and have a lot in common, what about you where did you start. regards mark.
This shop has been in my family for 51 years. My dad opened the shop in 1967. He passed 6 years ago. He taught me transfer cases, manual transmissions and differentials. Back in the 80's he was partners in a shop in florida, i went there for 2 years to learn tearing down and rebuilding. The shop in New York at the time was very high volume(10 cars within 30 minutes of opening each morning) so i really couldn't learn the way i wanted to, the shop in Florida was new and a much slower with business, so i was able to learn. When my dad could he would fly down and work with me about the operation of a transmission, i didnt want to just be a parts changer, i wanted to learn how they work so i could troubleshoot . I never been to Australia, have you ever visited New York?
Gary my dad was a underground coal miner all his life, he passed away at the age of 52 years he had a massive heart attack, I still miss him, dad was what you would call a jack of all trades but a master of none.I have never been to the u.s. as yet I just never seem to have the time after I finished my teck. training a mate of mine (a mechanic) and I leased a oil company service station for 5 years mainly for the workshop space that was all good we had a great business, but got sick of dealing with the public (some people you just can no please)so next stage of my working life I worked for cummins diesel (u.s. company) doing field service for 3 years I enjoyed doing that, and then into the trucking game and stayed doing that for most of my working life.I don't think it matters what trade any one gets into as long as you enjoy what you are doing, going to work every day is a pleasure.Gary I wanted to ask you what you would pay for a low mileage Gm.. 6l80e trans. in the u.s. I think I will buy a second hand one and rebuild it, give me some thing to do and stay out of my wife's way.regards mark.
what would cause a flare when it shifts from 2nd to 3rd? only does it very seldomly and only when you shift through the gears the first time and never does it again after its warmed up.
What brand rebuilt kit would you recommend for this transmission? Looking to do my transmission on my GMC Sierra long time technician getting into transmissions.
great video Gary. when replacing the tcm you have to take it to the dealer to reprogram it or you can do it with a scan tool? thanks in advance.. thumbs up!!!
+Josue Haro You cant program with a scan tool, only reset shift adapts. Either the dealer would program or if someone has the pass through device, they can program. Gary
Impressive video for sure. Gary I have an issue and maybe you can shed some light for me. Have a 6.2 sierra denali 2wd that is having issues with wot upshifts. Truck does perfect when driving normal, only it will hit rev limiter instead of shifting to next gear when wot. Fluid looks good and is proper level. Truck is also stock. No codes. Thanks
@@justinfears5869 It honestly may be programmed not to make WOT shifts, i believe police cars and corvettes may be the only vehicles that can make a wot shift. I had to research this a while back, had a customer thinking i messed up his jeep because it didnt make a wot shift and come to find out it;s not programmed to
For the 6l80 do I have to take out the valve to take off the bellhousing or is the bolts on front of it all we have to remove to take the bellhousing off
Gary awesome video. I'm quite a novice but I've a question. My Tahoe goes through all the gears but it's a bit harsh in down shifting, especially the low gears. Sometimes if I'm slowing down to a stop it even stars bucking. It's also jerky when taking off from a stop. I was thinking the pressure control solenoid could use replacing even though I'm not getting any check engine light. What do you think? Also can that solenoid be replaced by just dropping the pan? Thank so much. Zach
+UFZach35 Even though you have no check engine light, have you had it scanned? still may be a code causing an increase in line pressure. The solenoid is not serviced seperatly, you would have to buy the entire assembly which includes the solenoids, switches and computer, then it would have to be programmed once installed. Gary
+Gary Ferraro thanks for the info! Yes I've had it scanned at AutoZone and no codes come up, but however regarding the transmission I've heard that sometimes the dealers code reader can be more intricate and find other stuff? Not sure about this anyway thanks for the help
+UFZach35 Sometimes the "code reader" wont pick up certain codes, if you know someone with a snap on scanner that would be better, the tcm on this unit is inside the trans.
Hi Gary, I just put one of these in a 240z, no wiring is connected yet as im waiting for a gateway controller. Should R still work? or no signals from ecu means it just wont move?
I'm curious why just the #1 wears down and not the others? Sharp edges on just that part of the separator plate? On overhauls what do you recommend using? Will steel balls eventually wear down the plate like 4L60E's? Thanks for all the insightful videos!
The #1 ball gets the most abuse, i wouldn't do steel checkballs, the best ones to use are made from a torlon material, like the ones in a torque flight trans, or 42RE units
Gary Ferraro do you have to have the transmission removed to remove and fix the check balls in the valve body or can I drop the valve body with trans still in vehicle
Question Gary when is the best time to replace the full synthetic trans fluid in a 6L80 which is the same transmission the cadillac CTS V or even the new Chevy SS's out there and is it worth putting a external trans cooler with built in thermostat like the factory unit which comes out on the chevy ss's per say or even buying aftermarket unit with thermostat and only use for the car which is the L77 6lt is daily driven but due to the hi average temps in australia thinking its worth it due to they say the autos are not supposed to be serviced or fluid changed till around 120,000KM Please someone answer this question ?
Hi Gary, I do not think you edited it out but how is the valve body connected electrically? Thought I would see you unplug a harness or something but you just took it off?? DId I miss a step?
The valvebody contains the TCM(trans control module) when the trans is taken out of the car the eletrical harness is dissconnected then, on the bench, just pull off the valvebody, In the begining of the video i pull up that white tab to pull out a sleeve, thats where the harness plugs into. Gary
Oh yea I glimpsed the connector in there for a second in the vid, thanks for the reply. Great video, makes me nervous to watch I am like "he is going to forget how to put all those parts back together!!" LOL
Awesome video! Are there bulletproofing kits to fix all the weaknesses in these transmissions? Like the clutch drum? Didn’t Chevy upgrade the weak spots by the 2011 model year?
Gary Ferraro Thank you. Yeah, I keep my vehicles and build them back stronger. New trucks get old real fast and are way too expensive now a days. Keep up the great content!! :)
hey gary ferraro, i have a ve ssv 6l80e auto that doesn't go into any gear or even reverse like it will go in for a split second then back into neutral but on the dash still says its in gear, now i have pulled the techm out and noticed that 2 switch films are cracked and damaged would this be the cause? also seals on the valve body look abit messed up. also throws a generic check engine light "p0700" thank you
@@GaryFerraro burnt looking transmission fluid and the magnet has little bits of metal but not much, on jack stands i manage to get the car to spin the wheels when i quickly put it in second but not first
Hey Gary, thanks for the video...quick question: I have a 2012 esv rwd with a 6l80 its throwing p0796 and p0700 and not shifting past third.. Is it possible it's just the Solenoid being stuck per the code or do you think it's the 4-5-6 assembly?
I have a 2010 Tahoe with a 6180 that I'm having problems with. When put in drive it just revs up and won't shift into gear but if I put it on first gear manually it shifts good into second only if I let off the throttle after that I can put it back in drive. Might know what's causing this problem? Thank you
I would say either the checkball is the problem or there is a cracked piston in the 3-5/R,1-2-3-4 drum, What type of scanner are you using, this trans has its own TCM inside the unit, if your scanning the engine, it may not show codes.
No u can not. U have to remove the filter so the bell can come out. And you also have to remove the valve body so the drum has access to come out because it has 2 screws and 2seals that are on the way
Hey, very cool video. Got a little Question about the Ring which is above the 2,6 Clutch. Because it dont have teeth all around. How is it assembled? Has the section without a teeth to be at the location where the rabbets of the drum are?
May have a rough shift due to elevated line pressure, any codes present for the trans. This trans has the TCM inside so the trans needs to be scanned, if you scan just the ECM the codes may not show
@@GaryFerraro theres no codes but I'll try to scan the transmission directly somehow. It was a flood truck and I had to completely flush the transmission fluid out.
hey gary i have the EXACT same vehicle with the EXACT same problem. reverse works when cold and barely works when hot and also a delay on 2-3 shift when hot. transmission codes p0751 and p0700. do you think its the same problem as this one? where are you located?
Hi Gary, my transmission goes in reverse just fine, but then throws a p2723 code. When I clear the code it goes into a neutral state, but when the code comes in it will go forward but I have to floor it to get moving. Still goes in reverse fine but pops hard into gear.
Hi Gary I’ve read all the comments and think it’s great what your doing helping us backyard mechs out I’ve seen similar issues on posts but not exactly what I have. I have a 2009 6l80 4x4 truck that idk if this is what they call flare shifting but it revs up on the 5-6 shift but then engages great cold or hot, no other problems and no codes it does have a tune so I had my tuner reflash it and he said it seemed like the Trans learned something hanky but was working good again , that lasted about two weeks then started doing it again any ideas. hoping a valve body fix but my luck, cracked drum any input would help thank you
Yes reverse seem to be fine and it flares hot or cold or sometimes not at all. it flares worst the more power I let it shift with like if I get up to speed and let off the throttle it goes straight in and if I shift it manually it normally goes in fine but if I hold 1/4 throttle I get a little flare 1/2 throttle I get a big flare so it’s not consistent
i have a 2007 gmc sierra denali AWD and i scaned it it had a check engine light and the code it gives me is P0989 the tcm detects clutch or the 4-5-6 clutch is commanded on ,then the tcm sets DTC P0989 WHAT problem would you think it will have.?
+Gerardo Avelar That code has to do with a fluid pressure switch located on the Tehcm or tcm, what i would do is clear the code and see if it comes back, if it comes back you would have to monitor the pressure switch for proper operation, if its faulty, you would have to replace the tcm with a new one and have it programmed. Ive seen this code before and had to replace the tcm for this code in the past. Gary
If your check engine light is on also, sometimes they come on together, if your check engine light is not on, you would have to hook up a scan tool to get the code.
Thanks for the video sir ! Is this transmission harder than 4l60e and 545rfe and 68re ? That’s the main ones I’ve done and fixing to give it a try on this one . Is there way to do a relearn without a computer? thank you in advance!
I feel this trans is easier. As long as there are no codes present in the trans or engine, the trans will adapt when the transmission temp is above 140F, just do a lot of start and stops, make sure it shifts up through the gears. Gary
Gary Ferraro thank you for the fast reply! Was not expecting it so soon . 😀 I was reading the other day that transmissions and engine builders are a dying art . I’m a diesel mechanic for a living and build all sorts of different engines and build Eaton transmissions as well .every dealership has gotten so set on remans that you’re really not even a mechanic you’re a parts changer and as a father there’s nothing to be proud of and pass down to be a glorified parts changer . I first got interested in building small automatics owning all gm products and was tired of paying 12 ,1300 $ for something that I knew I could teach myself to do . So I hit up scrap yards and buy different styles of transmissions for scrap price weight and tear it down and diagnose and put it back together until I figure it out . I apologize for the life story but really appreciate guys that put videos out to show the d.i.y. and self starters
No problem for the fast reply, i happen to be sitting at my computer when the message came through. I 100% agree with what you wrote, i remember back in the day attending a seminar with about 500 people, i got one coming up in a few weeks now not even 200 people attending. Any questions just let me know.
Gary Ferraro have you got an email sir . That is bad ! It’s hard for me to be proud of saying yeah I swapped that part out I’d rather say yes sir I built that transmission oh bout 5 yrs ago lol. I hope half of what I typed made since lol my fingers and brain start getting out of sync . The 4l60 I built yesterday and installed in a 01 1500 the planetary set behind low reverse sprag stripped the gear on the gear for sun-shell. Before ever tearing it apart I already told myself well the sunshell broke or stripped. I’m glad I didn’t place a bet on it , cause I would have lost lol , but same symptoms.
Gary, since I have seen you reply to every comment, I thought I would try my luck with an online diagnosis. My 6l80e flares shifting into fourth, fifth and sixth, eventually shifting into neutral while I'm driving, displaying engine light and going into limp mode (second or third gear) I also noticed a grinding sound as I drove the car back home (and haven't used it since) It reports the following codes P0777 - Powertrain Pressure Control Solenoid "B" Stuck On P2724 - Powertrain Pressure Control Solenoid E Stuck On P0700 - Powertrain Tranmission Control System (MIL Request) Could this be the 4, 5, 6 clutch drum, or do i need to replace the (very expensive) pressure control solenoids
I have changed the 180,000km fluid last week and it is at the correct level now. There was no metal in the oil pan. Problem occurs immediately after driving and also when hot
Again, very good info. I've left comments on another video of yours.I have the 2006 STS V that started shifting funny. Reset the trans controller and it was fine for a while. Started shifting funny last sunday, got codes for the pressure switches which I will rebuild this weekend. Where did you get the snap ring pliers incase I have to pull it and rebuild?
Yes the large ones you used to remove the large snap ring in the case. Intention is to rebuild switches this weekend. Can I air test for a cracked 1-2-3-4 & 3-5 Drum when I pull the valve body?
The big pliers are from a company called adapt-a-case. You can air check the unit with the valvebody out, would be hard to see if the drum is cracked. When dealing with a cracked drum may have a very bad slip in reverse and a 2-3 slip, normally this happens hot.
Thank You, found them online. I deal with hydraulic systems for a living and we have some units that have large snap ring on them. Don't have any slipping issues cold or hot. I will set all the trans tables back to stock when I repair the pressure switches and will be replacing the check balls, separator plate, valve body seals plate and few other items. I'll let you know the results. Taking the time to answer my questions.
Just to follow up. I rebuilt the switches, but it didn't totally fix the issues. I was still getting random codes of different issues. Where I went from there was I got a rebuilt TECHUM from Dorman, my car called for a 609-004. I replaced the TECHUM and did a relearn with HPTuners which is the same as the GM relearn with a Tech 2, which I also have. Car shifted great on the test drive. I didn't shift as smooth as it does now since I bought it a year ago. Next issue was a pulsating of TCC when locked up most noticeable at highway speeds going up a hill. It would lock up and then slightly release and then lockup again. That is something in the GM code that others have had issues with. I fixed that in HPTuners, now all is good. Thanks for letting me bounce things off of you, you've been a big help. As is the case most of the time you never hear what fixed the issues so I thought I would share what worked for me. Thanks again.
hello, I have a 2009 Silverado with the 4l60e. I have 176k miles on the truck and I know sooner or later the trans is going to go out, I plan to run the trans until it does but once it does go out I would like to swap it for the 6 speed 6l80 in order to get better fuel mileage on the highway. how hard will this be to do, will I need a different TCM, etc?
I mean I would think something would be possible at least, I think worst case scenario you swap the computer, pull the old TCM and swap the transmission and hook everything up. I know they offered this transmission as an option back then so there has to be a computer out there for my truck that will run the TCM of this one won't.
Hi Gary! how do i change the paper gasket on the metal plate from the bodyvale?it looks like it has some glue or something on it.i bought new paper gaskets and i don t know how to remove the old paper gasket from the metal plate Thx!
+Gary Ferraro the paper from one side it s broken.i don t know this happened.it s more probably that somebody befor tried to remove it.now i have to change it.how can i do that?
Have 2007 GMC Yukon Denali with 6L80E with 182,000 miles and after trans flush/fill about 10,000 miles ago it's developed a delayed shift from 3-4. All other shifts seem fine. Sometimes it shifts fine but maybe after it's been warm. If I lift off throttle before shifting to 4th then it's a smooth shift. I haven't checked for codes (not sure where I'd get that done). Thoughts?
Sure would like to know if codes are present, do you have a check engine light on? If it gets better hot, im thinking lazy solenoid, but would like to know if codes are present, where are you located?
@@GaryFerraro thank you. I just watched your most recent video before work this morning. I have a very similar situation 2010 Chevy 2500 with a 4.8. Got it for really cheap because the transmission slipping. I plan on keeping it and I want to make sure the transmission is as bulletproof as I can make it.
@@Urbanight couple of updates you can do, the Pressure regulator in the pump always wears out, i replace that with a Transgo valve, drop in type. I also do an O-ringed end plug kit for the valvebody, the original bore plugs become loose
@@GaryFerraro I'll do that period thank you so much. Keep up the great videos alive us appreciate them a lot and have learned a lot and have learned a lot from you
Hello Gary I'm building my 6l80e that abruptly lost drive and reverse after some flareup in the 2-3 shift. I tore it down and found it had a cracked upper drum, the PR valve was stuck wide open, the 1234 and 3/5 reverse clutches were black and looked smoked and it had some steel and aluminum in the pan and magnet. I ordered a complete loaded drum with piston and 1234 3/5 reverse clutches and the 2011 upgraded pump cover, also I got the transgo shift kit with upgraded valves. My concern is my front bellhousing has some wear/grooves on the face of it where the ring rides that supports the pump vanes. I had some aluminum flakes in the trans and its coming from the bellhousing face under where the pump rides. How big of a problem is this? Can I still run that bellhousing and get good sealing or will it be a problem. I'm on a budget/hurry, but need it to be right and already ordered and almost received all my other parts and upgrades.
Okay thanks ill take a pic when I get back to the shop tomorrow. The sealing surface that the vanes ride on looks ok its just the face of the bell housing has some wear and light to moderate grooving. Thanks
Sorry I didn't get a chance to upload any pics of the bellhousing. I guess i'm just gonna run it. It doesn't seem to be damaged where the sealing surface is mostly grooved a little where the centering ring for the vanes rides. Can the gaskets to the valve body separator plate be reused?
The new 6l80e upper drum with clutches that I got has one less clutch plate in it then my 6l90e original drum but can I still use it if I get the fast relearn done?
Hi Gary I had a 1-4/3,5,R drum cracked in my 6l80, and replaced it. Now all symptoms have gone away all gears are normal, except there is a delay taking reverse. Once it takes reverse after 3-5 seconds it does not slip at all. Is this a valvebody problem?
Hello, First thing to try is a fast learn through the a scan tool, that may fix it. Also if there are any codes present in the system they must be cleared so the trans can adapt. The adaption process takes place when the trans is above 130F and no codes are present. Thanks for watching, please subscribe. Gary
I dunno why I always thought the 6L80E was a modified 4L80E. Its completely different. Is that bellhousing different than a standard old SBC? Do you think that transmission is heavier duty than a 4L80E?
Gary Ferraro I would love to have a 6 speed in my custom project but the 4l80e is the minimum strength I would want. I think PCS has a kit for the 4L80E to make it a 6 speed. Takes a gear change and a valve body change to do it right. Kinda spendy. Been waiting to see how others seem to like it and how it holds up for the long haul. Maybe next time I did into my project Ill do that. Cheaper than trying to get an Allison to fit. :)
I have a 2008 Yukon Denali the transmission started off with 1,2,3 would be delayed upon shifting I replaced the automatic trans fluid and the filter after I tried testing it out the vehicle would not go forward nor backwords what is the issue here
Thanks for the video, now i got the hot temp on my sierra 2500hd with 6l90 transmission from the first start the temp will increase until 105deg c but by traffic jam it will reach 120deg c where the car stop go stop go condition. After experienced the clutch stuck on 2nd gear, i bring the car to the garage for overhauling the transmission, change the clutch and still experience the same hot temp (reach 138deg c on the highway and cooling down when the car on and the gear on neutral) check the cooler line, pump everything is ok, now the mechanic ask to change the tehcm. i dont want to waste the money for some expensive part that not the main problem. Could it be crack from the gear as well? while i believe that the mechanic does not have enough experience as you and he will missed the drum test that you did with the air from below. Please suggest me while the car is still in garage until now
only when it reaches 138deg c it shows on the information center to idle the engine while the trans overheat, when i still keep running the line bar on the trans position gone on the information center so i dont know whether it is on D, M, N, when i keep running it stuck on 2nd gear and has an erratic sound when changing from 1st and 2nd then big sound coming from the tranny and it is disconnected from the engine, whenever i give throttle the gear was not giving any reaction. On that time the code shows that the torque converter lost or slip while i forgot the code number, i brought to the garage and the overhauling the tranny with changing all the clutch, filter, oil, check the cooler line, pump, torque converter and reinstall the tranny. During the test the mechanical issue was solved only the trans temp still remain the same (reaching 136deg c read from the information center) stop the car with idle engine and gear on neutral position, the temp slowly down, put the gear to drive and drive the car again the temp increase until 125deg c then stop and re open the tranny. check oil condition still good, no debris from the clutch and they decided to change the tehcm but i am not sure that the tehcm is the hot temp issue
@@MrSlim-nn7nh Do you know anyone with a snap-on or Autel scan tool. Live data will help, would like to make sure the range switch is reading corectly. Fluid level full?
+Robert Touchstone parts are more then 1000.00 for a proper rebuild on this six speed so you build shit that has problems for 200 no wonder you don't have even s tear down video 1200.00 rebuild on a 6l80
Question I have 2007 gmc yukon denali this Transmission is the same cause I want do some job selonoi pressure cltlutch issue thank you for any feedback is appreciated
I just got done rebuilding my 6l80e I wish i would of watched this video before putting it back in. Will be dropping it again tomorrow because my 3,5, reverse drum
Idk man im about to see. Its either cracked or i put the wrong seals in the pump. The master kit i bought had 3 diffrent sets. But i also didnt know they go in a certain way.
