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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1465 (Drive Axle - Limited-Slip Differential) >> Repair Instructions >> Locking Differential Adjustment >> Thrust Block Clearance Adjustment

Thrust Block Clearance Adjustment

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IMPORTANT: The left and right side gear backlash measurements must be done before the thrust block measurement can be completed.
    Fig 1: View Of Left Side Gear Thrust Washer
    GM790754Courtesy of GENERAL MOTORS CORP.
  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 the pinion shaft bolt.

    Tighten:  Tighten the pinion shaft bolt finger tight.

    7. Fig 3: Installing Brass Drift Between Locking Differential Side Gear & Pinion Shaft
    GM790751Courtesy of GENERAL MOTORS CORP.
  7. Install a brass drift between the left side gear and the pinion shaft.

    Press the brass drift in far enough in order to compress the clutch disc assembly and hold the left side gear assembly in place.

  8. Install a brass drift between the right side gear and the pinion shaft.

    Press the brass drift in far enough, in order to hold the right side gear assembly in place.

    9. Fig 4: Measuring Distance Between Side Gear Faces
    GM790765Courtesy of GENERAL MOTORS CORP.
    IMPORTANT: Do not measure the distance between the side gear teeth.
  9. Measure the distance between the side gear faces using a 25.4-50.8 mm (1-2 in) telescoping gage.
  10. Remove the telescoping gage.
  11. Measure the telescoping gage with a micrometer. Record the measurement.
  12. Compare the measurement obtained in Step 11 to the thrust block sizes available. If the measurement is equal to one of the thrust blocks sizes available, then select that thrust block.
  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 32.13 mm (1.265 in), select the 32.05 mm (1.262 in) thrust block.

    14. IMPORTANT: 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 31.75 mm (1.250 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 32.52 mm (1.280 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. Inspect the left and/or right side gear backlash and adjust as necessary.
  17. Inspect the thrust block clearance and adjust as necessary.
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