Rear road noise louder with speed? Not tires!

[woodsman]

As far as I know, those symptoms could be caused by either problem. I would think the differential repair would be in the $2-3000 range so to me it only makes sense to do the wheel bearing and hope for the best. A rear bearing at Suncoast or Sunset Porsche costs $60-65 and but it'll be far less in an industrial supply house which you could do if you're doing the job yourself; If so, it would be a good time to do the rear brakes, if needed.

[mountainman]

Wheel bearing would be my guess. Had the same symptoms on mine and wheel bearing did the trick