EJL1970

Gentlemen,

I am interested in increasing the performance of my Impala but not at the expense of destroying my transmission and 5 year/100K powertrain warranty simultaneously. By the sound of things on this forum, the transmission I have is already pretty much being stressed to the max with a 303 hp powerplant. Is this a fair assumption to make, and, if not, where should I start with non-warranty threatening performance modifications???????The transmission?

Thanks in advance for any input!

EJL1970:

neilownz

air intake and exhaust...

Nacho SS

iTrader: (4)

CAI, exhaust, shift kit.

EJL1970

So, a CAI, exhaust and shift kit won't adversely affect my warranty? Whose shift kit is the best for my tranny?

StealthV8

iTrader: (1)

a shift kit will probably void the warrenty. the rest wont

Brian396

iTrader: (3)

dont forget a tune, but you'll want to put it back to stock before warranty work

20SS07

Depending on the tune they can still tell if it's been tuned even if it's put back to stock so be careful there too.

EJL1970

Ok. So, if I put on a CAI and exhaust without the shift kit, can I expect a long and happy life from my transmission??????........minus a large number of burnouts of course?

EmersonHart13

iTrader: (3)

I think a stock car could ruin the transmission... Its really a crap shoot some are better than others...

JoshG20

I havent had a tranny problems with my 2008 and the only people I've heard of that have are on this forum. It's the spirited driving that brings the tranny issues.

cherrygxp

when i picked up my car it had 14k on it. At 15 the tranny **** out. the guy i bought it from was 62 so i dont think he was beating the snot outta it. The trannys are just crappy anyways. They have been a problem in all the previous years anyways. They just dont make a strong enough tranny for the power they are supposed to handle.

lovemyls4

No tranny issues here in my 07 . . . . i agree with joshG20

WE TODD DID

iTrader: (2)

Those transmissions have a hard enough time staying behind 6 cylinders, much less v8's. I don't know why gm didn't put the 4T80's in them instead.

bigalnash

is there a good tranny swap we can do for these cars?> or possible a manual ^^?

johnrogeri12

haha manual would be pretty badass

Tap Dat SS

FYI... The dealership can check the ECM/TCM for any re-programs. When a program is uploaded to a module there is an authorization code supplied by GM when new software is downloaded. If there is history of a programming update using the same auth code it automatically voids the warranty. Also, you can go back and look at previous data and if torque/HP numbers are higher than possible on a stock vehicle they can detect there were performance upgrades done. Best way around it is to buy a new ECM/TCM when you buy the vehicle, program it and save the original for when it has to go back to the dealer.

Nacho SS

iTrader: (4)

Thats the way to go, but the dealer doesn't usually check the ECM TCM over repairs and such. There was just a thread a little while ago which quoted a GM Tech saying this.

Tap Dat SS

I'm just saying if you had a major repair, such as engine or trans, they will most likely check and you will be stuck with the large bill.

radorider03

They have to prove that it was a direct result of the tune.

LS4SPEED

iTrader: (3)

Tap Dat, are you saying that if you use a Preditor tuner with performance tune, and when you take your car in to the dealer even with the stock tune reinstalled, the dealer will be able to tell if you had a custom tune installed, and then can yank your warranty?