I have just had my trans. mounts and flex disk replaced, but I am still hearing a bad rattle/ grinding from my undercarriage. It is inconsistent while driving stright, but awful when in a right-hand turn. left turn is not noticeable. I am assuming it is the centerbearing or u-joint...Rear wheels feel tight so I dont think its the wheel bearings. No noticable effect on performance, just a bad noise and vibration. Is there anything else that may be causing this??!!