The noise from the differential may go away by having it serviced; however, it may stay the same. For now, make sure the differential is full.
The reason I say the noise may not go away is because you may have already done the damage to a bearing. If you fill the differential and the sound still doesn't go away, replacing the seal and refilling it won't change it. The mechanic will need to identify where the noise is coming from.
Monday, March 1st, 2010 AT 7:59 AM