6T70, Gen2 Teardown 

I’ve been waiting for this video for soo long lol. Best video about 6t70 gen 2s on the internet.

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?

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 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.

Thank you Gary.

I want to learn more from you please keep us motivated

Thank You for the video

Does this valve body with mechatronics of the 6T70 usually have an ovality in the gate valve housing?

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

FWD trans are so interesting to see torn down.

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

Subbed!!

Brilliant Gary. Maybe the piston seal would have lasted longer if the oil was changed more frequently?

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

Is it true that the best brands of automatic transmission repair kits are Transtec and Precision International?

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.

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

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

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?

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

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

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.

On. 2017 impala what are signs the techm is bad And signs of a bad valve body?

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.

How much does a new 6T70 automatic transmission cost? And the mechatronics?

Do you see many problems with the gen 2 Tehcm's? If so what kind of problem do you see? Thank you

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

What vehicles are equipped with this transmission?

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.

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

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?

I have this Trans in my 2017 Impala premier. No problems at 125k but I always wondered why they enclosed the filter like that.

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?

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

I’ve not seen the piston do that on a 6t70; I have seen it on a bunch of 6f35n.

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

Also, is there a magnet somewhere in there?

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 guess the owner doesn't believe in service the way the transmission fluid looks on the table 🤔

Vittrans is the best auto service automatic transmission!!!

If installing a used one are they 'plug and play'? Or does the used one have to be reprogrammed to the installed car?