I have brought my car in for transmission work (third gear would pop out and grind everytime i put it in) and they took it apart and said all the gears were shot except for 5th. They also said that this could be a reason because of aftermarket parts (header, exhaust, intake, smaller tire size...wtf, engine mount, and a couple other small ones) and they assume because of the aftermarket parts, i beat the piss out of the car. They said they will warranty the transmission but after that, i lose the warranty. I remember reading about a document that is part of the law with warranties that unless the dealership can prove that the modification caused the problem, they have to warranty the part. Does anyone have any idea where that document is located?