6T70, Gen2 Teardown
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- čas přidán 29. 01. 2022
- In this video, i tear down a Gen2 unit with slips reverse and runsaway in 3rd, kinda sounds like a common problem with the Gen1 units, at the end of the video, i show what the problem is, I find the problem by air check the 3-4/rev clutch, i disassemble the drum and find the problem, 2017 caddy with 190K
- Auta a dopravní prostředky
I’ve been waiting for this video for soo long lol. Best video about 6t70 gen 2s on the internet.
Thank you for the followers’ response. You are a very nice person and love to help. I watched your videos. Very nice. I work in the same field. I hope I am there with you.
I want to learn more from you please keep us motivated
Does this valve body with mechatronics of the 6T70 usually have an ovality in the gate valve housing?
Thank you Gary.
Hi Gary. I appreciate all of your videos. I have one of these we are stumped on. We have rebuilt many of these 6T70s, but this one is fighting hard. Transmission shifts great when cold, when warmed up it slips, like shakes the whole car in Reverse under a load, first, second, third and possibly 4th and 5th as well. If you are light on throttle it shifts ok. Have had it apart two times and cannot find anything sticking it's head out. Picked through valve body, checked bushings.. I appreciate any advice provided and thank you again for creating these videos.
Nick
Sounds like a valvebody problem, how many miles?
@@GaryFerraro 66k miles. Thought it was possible TC slip but doesn't make sense why it would do it in reverse too to me. I did notice a little slop in the afl/solenoid accumulators in the vb would that cause this? I don't think it's TECHM since it's good when cold. thank you for replying. We had one other like this a few months ago and I ended up buying a used unit because I was driving myself nuts and I believe we tried TECHM on that as well.
And it does have a new recon TC. Sorry didn't mention that
@@nickfisher8791 Hi. Did you manage to solve the problem of shaking on a hot gearbox, I have exactly the same problem. What does recon TC mean? I will be grateful for your response:)
@@rafarafal5468 we ended up buying a used valve body. The aluminum portion, not the TECHM. And that took care of it.
Brilliant Gary. Maybe the piston seal would have lasted longer if the oil was changed more frequently?
Lots of miles
Where do you find parts for this trans? I have one in my 16' Impala Limited LT with the LFX 3.6 v6 and it has been throwing code p0989, which seems like the solenoid switch seals but I cannot seem to find a kit of just the seals online. What's the best way for a person to find a reliable source of parts for these, especially considering you said there are 5 different TEHCMs.
I had my 6t70 working for a few weeks
I put the old TCM back in and it turned out it was actually the wiring harness going to the TCM that was causing the problem.
So I fixed all those 12+ wires and got it all working for a few weeks.
Then the other day I got out of the car with park engaged to pop the trunk.
Closed the trunk got back in the car put it in drive before I stepped on the gas I looked down at the PRNDL selector to make sure I was in D.
The thing indicated R instead. I pushed back on the gear shifter all the way thinking that if it was in R it would slip in to drive when is usually the case when pushing all the back on the shifter.
So in fact the shifter was in D but the indicator showed R.
I put the car back in to park leaving the engine running.
I shifted back in to drive but the indicator remained in R.
Did it a few more times but the shift indicator remained in R the whole time.
I turned the engine off, then tried to turn it back on but the car wouldnt start.
I had to have the car towed home.
The tranny thinks it is in R but when I bypass the shift interlock the car will shift although the shifter feels like it is a little limp, it seems as if something isnt energized or something.
Any ideas?
Hi Gary thanks again this video was very informative and I'm glad that you convincingly pin pointed the problem, well done.
I need some advice on my alfa romeo it's a 159 it has a 6 speed automatic transmission front wheel drive its transmission code is TF 80SC AF 40k
When I change from park to reverse to drive and from drive to park to reverse I feel a bang or a knock.
I notice that the gearing is not smooth like it used to be during up and down shifts. It engages all the gears.Thus far I haven't attempted anything as yet.
Can u please advise me thanks in advance
Question, Is this ok cold and not ok hot?
@@GaryFerraro Thanks for such a quick response. yes when it's cold it's fine when hot I feel the bang especially when I'm in traffic
Is it true that the best brands of automatic transmission repair kits are Transtec and Precision International?
I just had mine rebuilt on my 17 regal with awd. This is the Second time the transmission has seen a rebuild and the car only has 73k. Dealer mentioned a lot of these cars had bad TC's. My issue was a slipping 3rd gear and vibrations. Car feels way smoother now but has an occasional hard 6th gear shift.
Dump GM products I do teardown on these transmissions GM Transmission are Garbage.
Was doing a engine swap and forgot to push in the tc, swap the torque converter with a remain and new seal. Car driver great when I drove it. Customer took the car and lost engagement. Scan the vehicle and got a P0796. Changed the tehcm and valve body same exact issue no faults yet. I am hearing a whine at time. Especially when Erving the engine. Any idea? There was fine partial in the fluid. Fluid was good when I had the vehicle. Thanks
Good explanation all the time why and how
Thank You for the video
Hello I Want to thank you for making these videos They are very helpful... Got a question 2015 traverse 60k Clean fluid no codes hard shift to 4th any thing you have come across?
May be an issue with the 4-5-6 clutch, You scanned the TCM not the ECM correct?
@@GaryFerraro yes sir scanned the tcm no codes that is what I was thinking I'm going to tear it down and inspect it thanks you for taking you time to respond....
Question. I have a 07 cobalt, not shifting to over drive, when I first got the car it wouldn't move in drive, added fluid now it will move in drive but won't shift to od, I've ran a scanner an have no codes
Do you have a scanner that shows live data, would like to see if 4th is being commanded
Subbed!!
where do you get your dewalt gun rebuilt at mac or snap on i have a worn out 1/2 dewalt gun hat to just throw it out snap on never last for me and to exspensive.i have bin using dwalt 20v for many years.
Dewalt ha a site Toolservice.com i called them and thats what they told me to do, I still do not have this back yet
How is it going Gary? It's nice that you show the common problems with these later model transmissions. The parts situation keeps getting worse and some of the new electrical stuff seems to be of questionable quality. The combination makes for a hard job for your parts supplier also. I hope he is doing okay as well.
Probably much more trans work is in store for you now that the blizzard has past by.
Bill
yes, everyone i passed during the storm was stuck in the snow
FWD trans are so interesting to see torn down.
Hi Gary, I am replacing the range switch on a 6t70 (in vehicle), and the selector rod pulled out completely. Is it possible to get that back in without rebuilding the transmission? Thanks for your time.
you may be able to, i did one in the car but made sure the rod did not fall out, if it slid out easy it should go back in,
I appreciate your time.
Do you see many problems with the gen 2 Tehcm's? If so what kind of problem do you see? Thank you
Not really seeing to much because they eliminated the pressure switches, however, when i rebuild these i always install new
Do you generally always replace the TECUM in the 6spd? Just curious, no disrespect intended but I haven’t replaced one yet. I always reuse them and put either a ZipKit or TransGo shift correction kit in the valve body.
yes, i replace them, i have had a few come back on me when i didn't to try to save the client money, so for now on everyone gets a new one
I can understand that if they are coming back on you.
Finishing a 6T45 today. I am really impressed with the engineering on this compact little unit. Don’t like the filter situation so much but the rest is pretty cool. It does have the gen 1 TECHM and ended up being some extra work cleaning and resealing all that. A new one would have saved some time for sure.
Hi Gary
You are a true master..great listening to you. Question, got a 4t60 with 94k . Been hearing a faint shudder on 2nd to 3rd shift when vehicle is warm. Goes away completely past that..when temp is below 20f no sound at all.. Torque converter?
Regards
Gordy
what year is the car?
@@GaryFerraro
2014 Cadillac srx
@@gordoncampbell1563 very possible, does it feel like a wash board effect or like driving on rough road?
@@GaryFerraro very light feel, but sound for 2 seconds is audible
Tach moves a little when sound is heard
@@gordoncampbell1563 could be the start of a converter chatter, you can always do a drain and fill of fluid and add an Instant shudder fix (the one in the red tube)
Managed to get a rubber tube stuck in the dipstick canal of our 2008 Aura XR 6T70 so need to pull off the control module to try to get that tube out. I'm guessing some fluid will run out but how much not sure as I'm guessing you drained the trans prior?
You should just need to pull the side cover off
@@GaryFerraro Yes assuming I can access all 14 bolts and get it out while the trans is still attached to the engine. I wonder if I drive or even start the car with that rubber tube in there, will it get sucked into the trans and blow everything up? I can bring it to a mechanic who has a lift which should make accessing the bolts much easier...
will not get sucked in, no worries, side cover should come out we do that all the time, things may have to be moved to access it but it will come off@@SportsMusicCars
@@GaryFerraro Excellent!! Thanks so much!! I noticed a small screw at the bottom of the trans. Is that the drain plug by any chance??
yes, kinda close to the side cover@@SportsMusicCars
I have this Trans in my 2017 Impala premier. No problems at 125k but I always wondered why they enclosed the filter like that.
Not sure myself, honda Transmissions are the same
Such a stupid design. They want you to go into the dealership for sure with that design.
Hi. I have issue with my impala limited 2016 it is about 65k. Once I shift to D, car doesn't move with RPM. Or move but very shortly. shift to R and ok. I was in mountains when it start fail to move. But I manage to drive back home on manual mode , 3 gear noe stop, if i stop it wil not move again Problem is that I am in italy an here no one knows what to do. Please advice, what can be the root cost of this failure. It is ex PPV from Police
How much does a new 6T70 automatic transmission cost? And the mechatronics?
this one was over 4k
I have this transmission with 78,000 KMS on it....all highway,when should I change the fluid in it...I was planning on 100,000...it's a 2018 impala....I also feel the downshift at 45 KMS going into 2nd..not harsh but only does it in that downshift...told by dealer this is normal operation
Change the half now better the condition of fluid will tell alot when you check it
I rebuild a 2 gen 6t75 out of a gmc arcadia I put everything new and followed a video step by step and it doesn’t move forward and harsh reverse engagement what can it be can it be seal don’t know any help please
Are you sure you hooked up the manual valve. Did you scan for codes? Did you change the TCM
Hi, first of all let me say that I love your videos. I find them very helpful. I too have an issue with a gen 2 that runs away in 4th gear however the entire tranny has been built. New valve bodies, TECHM you name it. I was hoping you could point me in the right direction. Thanks in advance
have you air checked the 4-5-6 clutch pack?
@@GaryFerraro No sir, Not yet. I guess I’m to the point of removing the trans again, which is no small job,lol. I do know for a fact that it was doing exactly this before the rebuild. Didn’t see anything out of the ordinary when I tore it down. So I figured something was up with the valve body. I will get it out and air check it. Will let you know what I find. Thank you, your awesome
What vehicles are equipped with this transmission?
Just about any vehicle that has a 3.6 Buick GM Chevy Impala Buick enclave Cadillacs...
I believe the tcm on my 2012 Impala went bad.
I have a retail obd reader and it throws a 'no communication with tcm' error.
I'm probably going to put in a used tcm, if it needs to be reprogrammed what would be the symptoms?
Right now its stuck in limp mode, its stuck in 3rd or 4th gear or something.
I read from a few sources that if a new tcm is installed the car *must* be flatbedded to the dealer or a shop that can program the tcm.
But if its used how would I be able to tell if the tcm needs to be reprogrammed?
If needs programming it may be in limp mode still. I have seen it both ways, when a used one was put in, best bet is to go by your vin number when you get the exchange one
@@GaryFerraro I dont know how you keep your shirt clean throughout this disassembly process.
I’ve not seen the piston do that on a 6t70; I have seen it on a bunch of 6f35n.
same here, first time i seen this, also 190K on the clock
On. 2017 impala what are signs the techm is bad
And signs of a bad valve body?
well, bad TCM could be communication codes or speed sensor codes, Bad valvebody could be flared shifts erratic shifting, of course issue could be inside the unit too
Hi Gary regarding the Tf 80sc Af 40 transmission you ask if it was good when cold and bad when hot
Yes that is the case
Can you advise further please
Sorry, we had a blizzard and now we are packed at the shop. If good cold and not good hot then your valvebody is no good
@@GaryFerraro HI thanks anything in particular.
Can shift valves be the problem
@@rafiekahmed8568 I would say either Valve Bore Wear or solenoid issues
@@GaryFerraro HI thanks will look into it
Also, is there a magnet somewhere in there?
On the filter
Can anyone direct me to a Gen 2 6T75 rebuild kit. Every kit I find is gen 1. I'm rebuilding a 2017 Traverse
I purchase from a company called Transtar, they have an on line ordering system called Transend, you can enter the Year,make and model of the car and should come up with parts
I guess the owner doesn't believe in service the way the transmission fluid looks on the table 🤔
Service would consist of removing the entire transmission to just get to the filter lol 😂
6t70 fit where 6t45 is on my cruze
will not fit
Vittrans is the best auto service automatic transmission!!!
Where are they located
If installing a used one are they 'plug and play'? Or does the used one have to be reprogrammed to the installed car?
I have seen it both ways, the last one i diagnosed for another shop needed reprogramming. My lead tech figured out that certain numbers didn't match up so he told me needed reprogramming and worked ok, the shop put a used trans in