Last night I was @ a dead stop and I turn right and accelerate just a lil bit and SNAP something made a huge noise....there was construction so at first I thought I might just have ran something over but today I started to notice that when shifting gears the car seems to sway all over starting from the rear.....and when going at a constant rate of speed then accelerating more the sway motion happens again...

Any Idea what may have happened? Im gonna check under the car today later on.

 

Panhard bar,LCAs,Maybe endlink(swaybar),etc

 

check the torque arm mount also. its right where the torque arm is bolted to the tranny. Very possible you just ripped the cheap little GM mount there...that will feel like there is a wet noodle holding the rear end in square...

otherwise just jack that thing up and check all the mounting spots on all of the suspension components...not hard, takes a matter of a couple minutes...

 

hmm....the noodle portion sounds correct....when I lift the car tommorow I hope that thats the problem and not the rear end.