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Home >> Chevrolet >> 2009 >> TrailBlazer 6.0 H, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 249 (Front Drive Axle) >> Repair Instructions >> Gear Tooth Contact Pattern Inspection >> Testing Procedure

Testing Procedure

WARNING: This page is about a different car, the 2008 Saab 9-7X. However, it is still accessible from the selected car via links, so may be relevant.
  1. Drain the differential carrier assembly of axle lubricant, if necessary. Refer to Front Axle Lubricant Replacement .
  2. Wipe clean the ring gear of axle lubricant. Carefully clean each tooth of the ring gear.
  3. Use a medium stiff brush in order to sparingly apply gear marking compound, GM P/N 1052351or equivalent, to all of the ring gear teeth.
    4. IMPORTANT: Performing the test without loading the gears will not produce a satisfactory pattern.
  4. Apply a turning torque load of 14 N.m (10 lb ft) to the differential case and the drive pinion.
    5. IMPORTANT: Avoid turning the ring gear excessively or a poor quality gear pattern impression will result.
  5. Using a wrench, turn the drive pinion flange/yoke so that the ring gear rotates at least 3 full revolutions.
  6. 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.
  7. Observe the pattern on the ring gear teeth. Compare the pattern with the following illustrations.

    Perform the recommended adjustments until the proper pattern is obtained.

  8. Once the proper pattern is obtained, continue the assembly of differential carrier. Refer to Differential Carrier Assembly Assemble .
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