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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 214 (Rear Drive Axle) >> Repair Instructions >> Locking Differential Adjustment (8.6 Inch Axle) >> Thrust Block Clearance Adjustment

Thrust Block Clearance Adjustment

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    Fig 1: View Of Left Side Gear Thrust Washer
    GM790754Courtesy of GENERAL MOTORS CORP.
    IMPORTANT: The left and right side gear backlash measurements must be done before the thrust block measurement can be completed.
  1. Install the locking differential clutch disc thrust washer into the left side or flange-end of the differential case.
    2. Fig 2: View Of Left Side Gear Cam Unit & Clutch Disc Assembly
    GM790759Courtesy of GENERAL MOTORS CORP.
  2. Install the locking differential side gear cam unit and clutch disc assembly into the left side or flange-end of the differential case.
  3. Install the differential side gear shim into the right side or bell-end of the differential case.
  4. Install the locking differential side gear and clutch disc assembly into the right side or bell-end of 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: View Of Brass Drift Placed Between Locking Differential Side Gear & Pinion Shaft
    GM790751Courtesy of GENERAL MOTORS CORP.
  7. Install a brass drift between the left locking differential side gear cam unit 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 locking differential 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 33.833 mm (1.332 in), select the 33.782 mm (1.330 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 33.578 mm (1.322 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 34.290 mm (1.350 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.
  18. Assemble the differential. Refer to Locking Differential Assemble (10.5 Inch Axle)  or Locking Differential Assemble (8.6 Inch Axle) .
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