We have two 2008 impala ss's. one was fixed, the other is still wearing the tires on the inside and we no longer have warranty. one dealership refused to fix the problem and another only aligned the rear wheels, but didn't actually fix the problem. this has been an ongoing problem since we purchased the vehicles. there is a Technical Service Bulletin on the 2008 Chevrolet Impala ss for this problem, but only on police cars. i don't understand why only on police cars if many others are having this issue. it appears to be the rear wheel spindle rods. i don't even know what that is!
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i would susppect a Alignment problem or even a worn out suspension part, i would start with new tires as you need them regardless and get an alignment, most of the tire wear is due to LACK of tire rotations and alignment checks. Start with that 1st , get new tires and an alignment check.
When ever front end work is done, front end needs to be realign, the wear your getting is call toe wear, mean tire's are pointing out, and will wear tire's on inside edge, have it realign and that will take care of your tire wear problem.
I have gone thru 3 sets of good tires now. Tires lasting from 10-12k miles before they hit cords. This is after the dealer does an alignment to spec. Funny thing is I have never seen the alignment specs from the dealer, I only get "aligned to spec". My wear is on the inside of the tires just as described in the police bulletin. I have tried different brands each time and get the same result (wear to the cords in 6 months or less). The bulletin only applies to the police version becasue GM doesn't want the bill for the thousands of ordinary customers repairs. There are enough complaints of this exact thing on any Chevy site that you can find. We aren't all nimrods.
You may be a guru, but I think you don't know what you are talking about.
this is a wheel camber (in and out tilt of wheel and tire) problem, u may have to have a Camber adjustment kit put in, most new cars have no adjustment provided for this. the bottom line here is you need to see a really good front end shop to get this taken care of, also the tires will continue to wear this way even if problem is corrected, so may want to replace them or rotate them.