GM Service Manual Online
For 1990-2009 cars only
    • Check the pinion gear shaft for unusual wear.
    • Check the pinion and the side gear teeth for wear, cracks, scoring and spalling.
    • Check the thrust washers for wear.
    • Check the fit of the side gears in the differential case and on the axle shafts.
    • Check the differential case for cracks and scoring and replace all of the worn parts as necessary.