xbladex00

Ohh so its just like uneven wear pretty much?

ibidu1

iTrader: (1)

Uneven, wavy, from the inside rear tire. Almost looks like toe wear!

From the waviness the rear tires get noisey and bouncy

ez12a

How often do you rotate tires? I stick by every 5k as a rule of thumb.

Also some tread designs are more prone to cupping than others. I had Conti DWS on my old TL and it was quiet for 15k miles.

xbladex00

gotcha ibidu1! For Sound deadening in the car I seem to hear road noise its not that loud if I put on music at about 05 - 10 I can't hear the noise haha... then again that has to do with tires right?

350AWD

I also rotate ever 5k. I didn't rotate this time because I didn't want to destroy the front tires.

350AWD

Latest update: problem was shocks.
Took the car to the dealer for the fuel sensor recall. I told them about the tire problem they told me shocks are all good. They did alignment and they were surprised about the camber bars. Service manager guy told me that was a great idea. I told them, "yea of course and People on the forum are a lot smarter than your techs". He didn't like that lol

Anyway, I decided to take one rear shock out and test it. Of course they were stuck at open (out position), I was not able to push them back in. I Ordered two new kyb shocks.

Lessons learned here is that I guess even if the car is bouncing when you push on the panels specially in the rear doesn't mean that shocks are. After you have checked all bushings and suspension components and you have cupping like I did most likely shocks are bad.

Thanks all for you response I hope this helps someone else in the future.

ibidu1

iTrader: (1)

Like I mentioned I thought my shocks were bad aswell, until I went and removed the old shocks the were the almost exact same compression and rebound as the new.

After I had the tech straighten the rear chamber to about -.55 (it was at -1.5) negative chamber the car handles a lot better and is not chewing up the inside of the tires. I also replaced the front rear large control arm bushing just because it was cheap and easy to swap out, and I heard they go bad.

350AWD

Ah I see, on mine, the shocks were bad but all pushing were good. Dealer correct my camber. What was interesting to me was the were extremely difficult to compress.
I do agree, the corrected camber and shocks the car feels very smooth and handles better.

ibidu1

iTrader: (1)

Do you have the report of the old alignment vs the new one? Curious to see what it was at

350AWD

I do I will try to post it here

350AWD

xbladex00

Thanks for the specs 350AWD... how much would it cost to do alignment at the dealership?... granted they would know about the rear tires being murdered on one side...

350AWD

They charged me 140 and were able to adjust the camber because of the SPC cambers bars I put in but Firestone can do it too way cheaper.

energie8

I'm confused, can someone clarify, so -.55 would make the wheel straight and not cause cupping/uneven wear? wouldn't 0 be straight? all 4 of my tires are cupping, but I'll consider the PSc adjustable camber.

isfdude

iTrader: (11)

Some camber arms and a set of tokico shocks and you are good to go. Shocks start going weak at an average of 50k, I know company's claim that they last longer but facts are facts.