6L80 "rebuilt" now nothing but problems

[Eric09LTZ]

Hello, I have an 09 Tahoe LTZ with TSP DOD delete and stage 2 high lift truck cam . I've put 75k miles on it since the engine rebuild. I got the transmission rebuilt with all new 6L90 heavy duty torque converter, forward drum , clutch packs new TECM , valve body ...etc.I told the guy that it was a custom tune and not to touch the ECM. The owner would rush me off the phone and wasn't communicating well . I went to the shop to talk to him and my truck wasn't there for 2 days , he said it was at the dealer to be flashed .They called me after a week and a half saying it was ready . I arrived to pick it up and the guy was trying to drive it for the test drive (which I declined and insisted to drive myself). after a hard acceleration to check shift points (which were back to stock 5200 , not 6000 where it was tuned ) the truck wouldn't go into first and would rev to 1700-2000 rpm before jerking forward in second. He begged me to let him fix it and stated it needed a shift kit. H claims to have put a Sonnax zip kit in . The trans was spray painted while in the truck , the dash has been torn apart ( vents and plastic wood panel loose) top of dash rattles by center speaker , driver door hangs now and rubs the jamb when closing, and my Y pipe was cut on the drivers side to drop the trans. since getting it back , I've had to replace the O2 sensor on drivers side , it hasn't driven right since . I took the valve cover off on the right side and my 7 and 5 rockers are broken with the snap rings broken and metal shavings throughout the top of the head. can the tune being deleted have this effect on my trunnions? They are Michigan motorsport caged trunnions . sorry for the long winded post .

 

[rdezs]

Sounds like somebody went way over red line in that engine.....

Cut the Y pipe? Mechanical malpractice that speaks volumes about the quality of the rest of their work. Time for your lawyer to send them a tort claim notice.

 

[mikez71]

It's possible the new TEHCM had no base tune in it, so he would have to get it flashed with the factory tune.
The transmission tune not being in the ECM, but in the TEHCM.
And there would be no way for him to keep your custom tune..
(Unless you re-use your old TEHCM, or have your new TEHCM programmed by whoever did it before)

I don't see how the tune being deleted would cause that type of damage..?
But it sounds like there was considerable collateral damage..

@NickTransmissions would know the most here..

 

[Eric09LTZ]

Sounds like somebody went way over red line in that engine.....

Cut the Y pipe? Mechanical malpractice that speaks volumes about the quality of the rest of their work. Time for your lawyer to send them a tort claim notice.

It's possible the new TEHCM had no base tune in it, so he would have to get it flashed with the factory tune.
The transmission tune not being in the ECM, but in the TEHCM.
And there would be no way for him to keep your custom tune..
(Unless you re-use your old TEHCM, or have your new TEHCM programmed by whoever did it before)

I don't see how the tune being deleted would cause that type of damage..?
But it sounds like there was considerable collateral damage..

@NickTransmissions would know the most here..

yeah , I didn't feel like it should interfere with the tune either . I had to change the O2 sensor on B1 S1 . also changed the plugs and wires as it was missing. and I noticed an error in my post . the rockers on the drivers side not the passenger side were the ones with the messed up trunnions. I haven't even bothered to take off the passenger side and look yet . the truck is down on power and feels like it's going to be taking its last ride soon . just bought another boroscope to investigate more . he said he had the chevy dealership flash the TEHCM . oh , I also found the 2 nuts for the transfer case mount were only finger tight . I was wondering why he would have had to tear into my dash too . PCM or BCM? I had 2 different associates recommend this shop for my trans . I really hope this guy hits his shin on something really hard tonight on his way to the bathroom or steps on a lego or something.

 

[jfoj]

Sounds like the shop was both sloppy and did not know what they were doing. Not sure why they would have torn into the dash unless someone at the shop wanted to swap something or the truck was broken into while at the shop and they tried to patch things up before you saw it??

They should not have played with the engine tuning, but if the shop had no idea what they were doing and sent it to a dealer, the dealer may not have been told about a tune.

Sounds like a bad situation all around.

You might check this video out for some ideas

 

[Eric09LTZ]

Sounds like the shop was both sloppy and did not know what they were doing. Not sure why they would have torn into the dash unless someone at the shop wanted to swap something or the truck was broken into while at the shop and they tried to patch things up before you saw it??

They should not have played with the engine tuning, but if the shop had no idea what they were doing and sent it to a dealer, the dealer may not have been told about a tune.

Sounds like a bad situation all around.

You might check this video out for some ideas

thank you , watching now

 

[Doubeleive]

this sounds like you got screwed, any moderately half way decent transmission shop would have the tools to learn the tcm to the vehicle.
especially being it is a GM vehicle 30% of the suv's out there are GM vehicles, so....wtf?
let alone cutting the exhaust pipe unless it was a rusty pos and not able to unbolt it, the stupid y pipe comes right out.
metal shavings and still driving it..... well that part is on you
and....they don't make shift kits for 6l80's (not in the traditional sense anyway) repair kits yes, which should have already been done with the rebuild

 

[swathdiver]

 

[Eric09LTZ]

this sounds like you got screwed, any moderately half way decent transmission shop would have the tools to learn the tcm to the vehicle.
especially being it is a GM vehicle 30% of the suv's out there are GM vehicles, so....wtf?
let alone cutting the exhaust pipe unless it was a rusty pos and not able to unbolt it, the stupid y pipe comes right out.
metal shavings and still driving it..... well that part is on you
and....they don't make shift kits for 6l80's (not in the traditional sense anyway) repair kits yes, which should have already been done with the rebuild

i havent driven it since finding the metal . I definitely got screwed. i also noticed i ave 3 permanent misfire codes for the afm cylinders. i figured if i had those codes i should have 4 and not 3 . i thought i was dealing with a decent shop , theyve been around for 30 something years

 

[jfoj]

How long did the shop have the truck?

Thinking about the AFM/DOD delete and different camshaft. Not sure what lifters are in the engine, but maybe if the dealer reflashed the ECM it caused problems with the AFM/DOD delete?

Maybe you just found the rocker problem after the ECM was possibly reflashed. Might not be related, but just happened to show up after the dealer played with programming?

Dealer probably had no idea what work was done to the engine, they should have only flashed the TCM. Some shops have people that can remotely flash the transmission modules in case a replacement solenoid section has been replaced.

 

[Eric09LTZ]

I had the whole delete package from Texas Speed . LS7 lifters and trays. the truck felt heavy after getting it back from the shop but about a month after started ticking . this was after changing plugs , wires, o2 etc... I was thinking the shop owner didn't relay the info about the HP tuners tune being on the truck to the dealership . he was always so brief on the phone .

 

[Eric09LTZ]

How long did the shop have the truck?

Thinking about the AFM/DOD delete and different camshaft. Not sure what lifters are in the engine, but maybe if the dealer reflashed the ECM it caused problems with the AFM/DOD delete?

Maybe you just found the rocker problem after the ECM was possibly reflashed. Might not be related, but just happened to show up after the dealer played with programming?

Dealer probably had no idea what work was done to the engine, they should have only flashed the TCM. Some shops have people that can remotely flash the transmission modules in case a replacement solenoid section has been replaced.

the shop had the truck for 2 weeks and I have LS7 lifters from TSP as part of the DOD delete bundle

 

[Dustin Jackson]

So you had a perfectly running Tahoe and went for a trans rebuild and they ruined everything about it?

This story sounds worse than most nightmares I have.

 

[Eric09LTZ]

So you had a perfectly running Tahoe and went for a trans rebuild and they ruined everything about it?

This story sounds worse than most nightmares I have.

the trans would not shift past 3rd . I would have to shut the truck off and back on to get it to even do that sometimes. no ticking , no rough running , just trans issues . I dated a girl once that was probably related to this shop owner

 

[alpha_omega]

the trans would not shift past 3rd . I would have to shut the truck off and back on to get it to even do that sometimes. no ticking , no rough running , just trans issues . I dated a girl once that was probably related to this shop owner

Did you try manually shifting?

It definitely sounds like the stealership may have also screwed the pooch with their reflash. I can’t say for sure, but honestly none of what was done to your vehicle makes any sense. Who cuts an exhaust pipe? Worst case blaze the bolts off.

What kind of shape is your body in? Where do you live?
Edit: Being in Chi-town - you may have a rusted underside, but even still.