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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1585 (Rear Drive Axle) >> Repair Instructions >> Locking Differential Adjustment (10.5 Inch Axle) >> Thrust Block Clearance Adjustment

Thrust Block Clearance Adjustment

WARNING: This page is about a different car, the 2010 GMC Sierra, 2010 GMC Cab & Chassis Sierra, 2010 Chevrolet Silverado, and 2010 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: The left and right side gear backlash measurements must be done before the thrust block measurement can be completed.
    Fig 1: Left Side Gear Thrust Washer
    GM882831Courtesy of GENERAL MOTORS CORP.
  1. Install the differential side gear shim.
    2. Fig 2: Left Side Clutch Plates & Guide Clips
    GM882829Courtesy of GENERAL MOTORS CORP.
  2. Install the clutch pack assembly.
    3. Fig 3: Locking Differential Side Gear
    GM882828Courtesy of GENERAL MOTORS CORP.
  3. Install the differential side gear.
  4. Assemble a set of washers, a nut, and a bolt long enough in order to hold the side gear in place.
    5. Fig 4: Installing Bolt & Washer Assembly Through Differential Case Half
    GM882839Courtesy of GENERAL MOTORS CORP.
  5. Install the bolt and washer assembly through the differential case half.
  6. Install a second set of washers and the nut onto the bolt extending through the differential case half.
  7. Install the differential case half into a vise.
  8. Clamp on the nut on the bottom of the differential case.
  9. Tighten the bolt until the clutch plates are compressed.
    10. Fig 5: J 34672 & J 34673
    GM882843Courtesy of GENERAL MOTORS CORP.
    NOTE: You will need two of the J 34673 to perform the following service procedure.
  10. Install the J 34673:  bar, J 34672:  micrometer (2) and the J 34672:  micrometer (1) onto the differential case as shown.
  11. Install the J 34673:  bar onto the face of the differential case, not the ridge of the differential case, or an inaccurate measurement will result.
  12. Measure the depth from the face of the J 34673:  bar to the face of the differential side gear using the J 34672:  micrometer.

    Record the measurement.

  13. Measure the thickness of the J 34673:  bar.
  14. Subtract the thickness of the J 34673:  bar from the measurement obtained in step 10.
  15. Record the measurement. This measurement is equal to one-half of the thrust block thickness.
  16. Remove both of the J 34673:  bar from the differential case.
  17. Remove the differential case half from the vise.
    18. Fig 6: Right Side Locking Differential Clutch Disc Thrust Washer
    GM882850Courtesy of GENERAL MOTORS CORP.
  18. Install the locking differential clutch disc thrust washer.
    19. Fig 7: Right Side Cam Unit & Clutch Plate Assembly
    GM882834Courtesy of GENERAL MOTORS CORP.
  19. Install the differential side gear cam unit and clutch pack assembly.
  20. Assemble a set of washers, a nut, and a bolt long enough in order to hold the side gear in place.
    21. Fig 8: Installing bolt & Washer Assembly Through Differential Case Half
    GM882845Courtesy of GENERAL MOTORS CORP.
  21. Install the bolt and washer assembly through the differential case half.
  22. Install a second set of washers and the nut onto the bolt extending through the differential case half.
  23. Install the differential case half into a vise.
  24. Clamp on the nut on the bottom of the differential case.
  25. Tighten the bolt until the clutch plates are compressed.
    26. Fig 9: Installing J 34672 & J 34673 Onto Differential Case
    GM882847Courtesy of GENERAL MOTORS CORP.
  26. Install the J 34673:  bar (2) and the J 34672:  micrometer (1) onto the differential case.
  27. Measure the depth from the face of the J 34673:  bar to the face of the differential side gear using the J 34672:  micrometer. Record the measurement.
  28. Measure the thickness of the J 34673:  bar.
  29. Subtract the thickness of the J 34673:  bar from the measurement obtained in step 23.
  30. Record the measurement. This measurement is equal to one-half of the thrust block thickness.
  31. Add the measurements in step 12 and step 25 together. This is the thickness for the thrust block.
  32. Compare the measurement obtain in step 25 to the thrust block sizes available. If the measurement is equal to one of the thrust block sizes available, the select that thrust block.
  33. If the measurement obtained in step 25 is not equal to one of the thrust block sizes available, then select the thrust block that is smaller the measurement. For example, if the measurement is 40.919 mm (1.611 in), select the 40.894 mm (1.610 in) thrust block.
    34. NOTE: The backlash must be rechecked and adjusted to specification anytime the left and/or the right thrust washers are replaced.
  34. If the measurement obtained in step 25 is less then 40.488 mm (1.594 in), then reduce the left differential side gear shim or the right locking differential clutch disc thrust washer thickness in order to increase the thrust block opening.
  35. If the measurement obtained in step 25 is greater then 41.120 mm (1.622 in), then increase the left differential side gear shim or the right locking differential clutch disc thrust washer thickness in order to decrease the thrust block opening.
  36. Recheck the left and/or right side gear backlash and adjust as necessary.
  37. Recheck the thrust block clearance and adjust as necessary.
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