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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1331 (Rear Drive Axle) >> Repair Instructions >> Locking Differential Adjustment (11.5 Inch Axle) >> Thrust Block Clearance Adjustment

Thrust Block Clearance Adjustment

WARNING: This page is about a different car, the 2009 GMC Sierra, 2009 GMC Cab & Chassis Sierra, 2009 Chevrolet Silverado, and 2009 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
    Fig 1: View Of Left Side Gear Thrust Washer
    GM790754Courtesy of GENERAL MOTORS CORP.
    NOTE: The left and right side gear backlash measurements must be done before the thrust block measurement can be completed.
  1. Install the left side gear thrust washer into the differential case.
    2. Fig 2: View Of Left Side Gear Cam Unit & Clutch Disc Assembly
    GM790759Courtesy of GENERAL MOTORS CORP.
  2. Install the left side gear cam unit and clutch disc assembly into the differential case.
  3. Install the right side shim into the differential case.
  4. Install the right side gear and clutch disc assembly into the differential case.
  5. Install the pinion shaft.
  6. Install a 7.0 mm (0.276 in) drill bit into the pinion shaft retaining pin opening to retain the pinion shaft.
    7. Fig 3: View Of Brass Drift Placed Between Locking Differential Side Gear & Pinion Shaft
    GM790751Courtesy of GENERAL MOTORS CORP.
    NOTE: Press the brass drift in far enough in order to compress the clutch disc assembly and hold the left side gear assembly in place.
  7. Install a brass drift between the left side gear and the pinion shaft.
    8. NOTE: Press the brass drift in far enough in order to hold the right side gear assembly in place.
  8. Install a brass drift between the right side gear and the pinion shaft.
    9. Fig 4: Measuring Distance Between Side Gear Faces
    GM790765Courtesy of GENERAL MOTORS CORP.
    NOTE: Do not measure the distance between the side gear teeth.
  9. Using a 25.4-50.8 mm (1-2 in) telescoping gage, measure the distance between the side gear faces.
  10. Remove the telescoping gage.
  11. Using micrometer, measure the telescoping gage and record the measurement.
    12. NOTE: If the measurement is equal to one of the thrust blocks sizes available, then select that thrust block.
  12. Compare the measurement obtained in Step 11 to the thrust block sizes available.
  13. If the measurement obtained in Step 11 is not equal to one of the thrust blocks sizes available, then select the thrust block that is smaller than the measurement.

    For example, if the measurement is 46.43 mm (1.827 in), select the 46.35 mm (1.825 in) thrust block.

    14. NOTE: The backlash must be rechecked and adjusted to specification anytime the left and/or the right thrust washers are replaced.
  14. If the measurement obtained in Step 11 is less than 46.055 mm (1.813 in), then reduce the left side gear thrust washer or the right side gear shim thickness in order to increase the thrust block opening.
  15. If the measurement obtained in Step 11 is greater than 46.755 mm (1.841 in), then increase the left side gear thrust washer or the right side gear shim thickness in order to decrease the thrust block opening.
  16. Recheck the left and/or right side gear backlash and adjust as necessary.
  17. Recheck the thrust block clearance and adjust as necessary.
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