Mounts are the 1st thing id check. Oped da hood. Get in da drivers seat. Do your best to see whats going on under da hood. Put it in gear. Movement? Put it in reverse. Movement? Brake torque it when in either gear. You will see whats up that way if its a mount issue. 2nd thing, could be a ton of stuff. Carrier bearing if applicable. U joints. Rear end slop. Check mounts 1st. Go from there. Keep posting.