Knocking/bouncing noise from the rear? 98 ws6 trans-am, knocking/bouncing only turning left and under load ( getting on it) have not heard any grinding from axel, these are things been done to it, stage 3 clutch,poly-bushings, replaced trailing arms, sway bar, torque arm, welded in subframe, pinion bearing replaced one time, (leaking a little now ) 93000 miles on it, at one time had twin-turbos on it, taken off before noise, 2000 corvette motor ( org blown-up, 23000 on this motor ) drag raced some but not with slicks, mostly setting now, anyone want to hazard a guess ? would be much appreciated ( 93000 miles on car total) thanks