06' ECSB. 5.3, Nelson 93 tune, 28k miles. Factory 20in wheels, 3.73s

About a month ago I was merging into traffic. I stomped on it at 25mph, it kicked down into 1st, I was in a bit of a curve, so the tires broke loose, which caused the engine to rev up, and shift into 2nd. It bogged, kicked back down to 1st, but this time when it hit 2nd it barked the tires REAL hard.

For a few days after that, under full throttle, it would shift really aggressive into 2nd. After a few days, this stopped, and ever since, the 1-2 shift is taking a long time. Nearly 2 full seconds between actual gear changes, at the end of the shift, the truck lunges hard forward. It only does this under full throttle 1-2 shifts, and at anything but full throttle, the shifts are still nice and firm, and in a timely fashion.


I fear the tranny is on the way out. The truck only has 28k on the clock, and I NEVER have towed with it. I dont baby the truck, but its far from being abused. Every other gear change is great. Quick and firm, just like the day I got it back from Nelsons.

Im worried that the GM place will see my tune and void the warranty. I have tried to contact Nelson, maybe he could loan me a stock computer until I get the warranty taken care of, then, pop my old one back in with the tune.

Thoughts??

 

I'd definetly get it to the dealer, but your gonna want some way of gettin it back to stock tune. becasuse if they figure it out you may have some problems.

 

they will never know it unless you tell them. we dont go looking for that stuff when it comes to transmissions...

 

better safe than sorry... i would also set it back to stock and take it in to the dealer

 

+1 i work at a gm dealer... we just get the job done.. we dont look at any of that unless we have reason to... otherwise you just get a nice new tranny

 

haha can you request a Corvette servo to be installed when they do something like that?

I know the Stealerships around here will argue you down that it wont fit... Idiots..

 

the probably wouldnt know what to say... i had a few service writers think i was bsing them whenni was at work loading a tune... they said i was full of it and there is no way i could modify the gm computer... so i real quick loaded the stock tune... took them for a full throttle run... then loaded "my tune" they didnt argue much after that

 

You should see their faces when i pull up......

"You did what to your truck?!?!"

I think that big shiny thing where the air filter use to be throws them off.....
Then they always ask..."Where is your air filter?"
Um........

 

umm i moved it to the back.. its for um... better weight distribution.. yeah thats it... make the weight more even

 

when my first two trannys went out i new the guy that owned the dealership were i got my truck and he said just take it in there..had dual exhaust tune and 150 shot at the time..took it in there and the service bout had a **** fit sayin they cant do that..then steve came in and said just put the stock tune in and take the nitrous off and they replaced it then two weeks later it blew again and they changed it again