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Testing Procedure

WARNING: This page is about a different car, the 2003 GMC Safari, 2003 Chevrolet Astro, 2002 GMC Safari, and 2002 Chevrolet Astro. However, it is still accessible from the selected car via links, so may be relevant.
  1. Wipe clean the differential case, the ring gear and the differential carrier housing of lubricant. Carefully clean each tooth of the ring gear.
  2. Use a medium stiff brush in order to sparingly apply gear marking compound GM P/N 1052351 (Canadian P/N 10953497) to all of the ring gear teeth.

    Important:  Avoid turning the ring gear excessively.

  3. Using a wrench, turn the drive pinion flange/yoke so that the ring gear rotates at lest 3 full revolutions.
  4. Turn the drive pinion flange/yoke in the opposite direction so that the ring gear rotates at least 3 full revolutions in the opposite direction.
  5. Observe the pattern on the ring gear teeth. Compare the pattern with the following illustrations.
    Fig 1: Observing Pattern On Ring Gear Teeth
    G01643042Courtesy of GENERAL MOTORS CORP.
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