Opened the diff to see how to fix the rear axle in-play (over 3mm) and vibration.

Could not get the pinion shaft locking bolt loose and rounded off the head (in the middle of the picture). Had to weld on a piece of metal to break it loose.

This proves that my rear end gears have 2.73 ratio.

Had to replace a bent axleshaft because the car was hopping/vibrating at 50+mph.