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Home >> GMC >> 2003 >> Safari Van Cargo, AWD >> Repair and Diagnosis >> Drivelines & Axles >> Differentials & Drive Axles >> Rear Drive Axle >> Repair Instructions >> Gear Tooth Contact Pattern Inspection >> Testing Procedure

Testing Procedure

  1. Wipe clean the differential case, the ring gear and the axle 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.
    Fig 1: Applying Gear Marking Compound Or Equivalent By Using Medium Stiff Brush
    G01643154Courtesy of GENERAL MOTORS CORP.
  3. Torque the bearing caps bolts to specification.

    Important:  Performing a test without loading the gears will not produce a satisfactory pattern.

  4. Apply the park brake until a torque load of 14 N.m (10 lb ft) is required in order to turn the pinion.

    Important:  Avoid turning the ring gear excessively.

  5. Using a wrench, turn the drive pinion flange/yoke so that the ring gear rotates 3 full revolutions.
  6. Turn the drive pinion flange/yoke in the opposite direction so that the ring gear rotates 3 full revolutions in the opposite direction.
  7. Observe the pattern on the ring gear teeth. Compare the pattern with the following illustrations.
    Fig 2: Identifying Correct Contact Pattern
    G01643155Courtesy of GENERAL MOTORS CORP.
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