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Testing Procedure

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  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) or equivalent to all of the ring gear teeth.
    3. IMPORTANT: Avoid turning the ring gear excessively.
  3. Using a wrench, turn the drive pinion flange/yoke so that the ring gear rotates at least 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: Identifying Pattern On Ring Gear Teeth
    G01455980Courtesy of GENERAL MOTORS CORP.
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