Well I guess I can start with the symptoms. Before I took the car to the shop to replace the rear wheel bearings. The car would make gringing,vibration, shuttering sound in moderate acceleration. If I eased in the acceleration It would not make noise, and I could get up to highway speeds.When I got the car back from the shop, the noise was much louder and even at light acceleration it still made noise.I even noticed it made a flapping sound for a while as if something was hanging loose on the drive shaft. Could it be the differential? As for the parts all he said the same thing. I talked to him to day.