LS4 Performance Grand Prix GXP | Monte Carlo SS | Impala SS | LaCrosse Super

New to the ls4's and looking for some tips

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Old Mar 5, 2016 | 08:51 PM
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Default New to the ls4's and looking for some tips

Hey guys, I've been around the lt1 and ls1 platform for around 10 years with the f-bodys and absolutely love them. Well now I have a family, and need to get something with 4 doors. I've just started looking at the gxp's and impala ss'. They seem like pretty nice vehicles and I'm thinking I may pick 1 up.

My questions to u guys are, what are the problems and or issues to look for with the ls4 platform when I'm looking at them. Are there any particular years that are preferred, or certain years that I should avoid? Is 1 model preferred over the other?

to those of you who own them, how do u like them for daily drivers?

Thanks alot for any help fellas.
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Old Mar 5, 2016 | 09:17 PM
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transmissions, transmissions transmissions, cannot say this enough, almost every GXP out there has had their trans replaced at LEAST once. Honestly if the budget permits it, G8 GT might be the way to go.
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Old Mar 5, 2016 | 09:29 PM
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Originally Posted by spawne32
transmissions, transmissions transmissions, cannot say this enough, almost every GXP out there has had their trans replaced at LEAST once. Honestly if the budget permits it, G8 GT might be the way to go.
That was my first choice but the g8's are much harder to find and Seem to be out of my price range. Thanks for the tip on the trannys tho, that's the kinda info I'm looking for about these cars. Any other tips like that would be great.
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Old Mar 5, 2016 | 10:02 PM
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They are good daily drivers, but the aftermarket is very slim. Dont expect to be able to modify like the Fbodys without a good amount of fab work as aftermarket performance parts are few. The cars are reasonable now, too reasonable. As it has been said, transmission will probably need to be addressed if it has not already, and for some reason they are much more expensive than most. Good luck

Last edited by rottonj; Mar 5, 2016 at 10:15 PM.
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Old Mar 5, 2016 | 10:07 PM
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Awesome car comfortable ride just leave it alone or only slight mods and a tune don't get carried away or it will carry your pocket away ask me how I know lol.. Good luck
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Old Mar 8, 2016 | 07:33 AM
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there are a few things you can do to help the transmission life tho. get a big tranny cooler for it, throw in a trans go shift kit, and get a tune. most guys run the diablo sport intune. they have a good tune in there to firm up the shifts. firmer shifts means less slipping, which means less heat, which means longer transmission life. I have a 06 monte ss. which is the same as the gp gxp and impala ss. I threw in the shift kit, big cooler, dropped and replaced fluid, and did the tune. and it performs great.
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Old Mar 8, 2016 | 08:56 AM
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GOT HPTUNERS NOW,my diablo with lew tune and overkill ls7 tune about to hit market
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Old Mar 8, 2016 | 09:27 AM
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other issue i have with mine is my front tire dont last long. they tend to wear uneven. also gxp is hard to find matching front/rear tires. guess they are odd sizes.

dash is crack(you are probably use to that since you owned fbodys), heads up display stopped working, abs module stopped working... yeah mine needs some tlc lol
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Old Mar 8, 2016 | 09:51 AM
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yep no rotating tires on these cars but never a problem i get alignment evey6 months or so and i got michelin pilot sport as/3 with no problem from walmart lol 2 sets of them no issues
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Old Mar 9, 2016 | 02:55 PM
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Originally Posted by superglide9375
GOT HPTUNERS NOW,my diablo with lew tune and overkill ls7 tune about to hit market
well, your intune will work for someone else, as long as you restored the original backup stock tune to your car to unlock/reset it..

but your tunes will not work for anyone else.. tunes are tied to a vehicle by VIN number and engine calibration ID's and will only work for/install on the specific vehicle they were made for...

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Old Mar 9, 2016 | 05:36 PM
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Ok yea I wasn't sure about that but found out today that u can't haven't had time to get on here and update
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Old Mar 9, 2016 | 08:55 PM
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Originally Posted by superglide9375
GOT HPTUNERS NOW,my diablo with lew tune and overkill ls7 tune about to hit market
Wow my in tune is making it around lol
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Old Mar 9, 2016 | 10:23 PM
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Good friend of mine who's a mechanic recommends changing oil for sure every 3,000 miles
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Old Mar 9, 2016 | 11:32 PM
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yup pimpala it was awesome when u gave it to me for that price and charging same to next guy
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Old Mar 10, 2016 | 08:42 AM
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Originally Posted by GXPHelo
Good friend of mine who's a mechanic recommends changing oil for sure every 3,000 miles
that reminds me, they tend to eat through oil too. mines not as bad now that i disabled dod but still a quart or two per oil change.
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Old Mar 10, 2016 | 09:24 AM
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aint forgot about u blkchevyz,car is getting re re inspected,tint gotta come off,234 k and thats what they get me on
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