I have a 08' TSX and it's a automatic; I drive it in tiptronic all the time. In 2nd gear at 5000rpm the car shakes, 3rd gear at 4000rpm car shakes, 4th at 3000rpm car shakes; throughout all the shaking it goes away at higher speeds; I can't seem to figure out the problem. Can anybody give me a heads up what it might be or is?

Thanks

 

1st, does it behave normally using the automatic side ? if so, then your manual mode is messed uo.

when using the manual mode, pop it into neutral, if it still shakes, then its not your tranny or axles, it is most likely your tires or a bent rim. if it stops shaking in neutral, then its your tranny, drivetrain, axles.