Yodace,
How old is your TC3? There was problem with one of the rear carriers in early production. The complaint from people was that one side had more toe than the other. Associated had to re-tool the mold for that part. I know that this was discovered early in the TC3's production, so if your car was purchased rather recently, that wouldn't be the problem; on the other hand, if you bought it used, or don't know how old the car is, you might want to try buying new rear carriers.