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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 (10.5 Inch Axle) >> Left Side Gear Backlash Adjustment >> Notes

Left Side Gear Backlash Adjustment: Notes

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    Fig 1: View Of Left Side Gear Thrust Washer
    GM882831Courtesy of GENERAL MOTORS CORP.
  1. Install the differential side gear shim.
    2. Fig 2: View Of Left Side Clutch Disc Assembly
    GM882829Courtesy of GENERAL MOTORS CORP.
  2. Install the clutch pack assembly.
    3. Fig 3: View Of Locking Differential Side Gear
    GM882828Courtesy of GENERAL MOTORS CORP.
  3. Install the differential side gear.
    4. IMPORTANT: The washers must be large enough in order to fit over the differential side gear, but not too large to where they will cause an interference with the pinion gear and spider assembly.
  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: View of 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. Fig 5: View Of Locking Differential Spider, Differential Pinion Gears & Thrust Washers (Left Side)
    GM882827Courtesy of GENERAL MOTORS CORP.
  9. Install the differential pinion gears, the differential pinion gear thrust washers and the locking differential spider into the case half.
  10. Loosen the bolt in order to turn the differential side gear.
  11. Index the pinion gear so that one tooth is pointing downward, perpendicular to the case half face.
  12. Tighten the bolt until the clutch discs are compressed.
    13. Fig 6: Measuring Differential Pinion Gear To Locking Differential Side Gear Backlash
    GM886762Courtesy of GENERAL MOTORS CORP.
  13. Install the J 7872  onto the differential case. See Special Tools .
  14. Loosely clamp the J 8001-3  onto the stem of the J 7872  . See Special Tools .
  15. Place the contact pad of the J 8001-3  on the tooth that is perpendicular to the differential side gear.
  16. Preload the dial of the J 8001-3  approximately one turn clockwise.
  17. Tighten the lock nut on the J 7872  finger tight. See Special Tools .
  18. Turn the dial of the J 8001-3  until the needle and the dial face indicate ZERO.
    19. IMPORTANT: In the following procedure, DO NOT unseat the locking differential spider. This will make the backlash reading inaccurate.
  19. Measure the differential pinion gear to locking differential side gear backlash by performing the following steps:
    • Pull the pinion gear firmly into the seat.
    • Rotate the pinion gear back and forth while reading the dial indicator.
    • Record the measurement.
  20. Measure the differential pinion gear to locking differential side gear backlash on the other 2 pinion gears following the steps above.

    Specification:  The backlash between the differential pinon gear and locking differential side gear should be between 0.051-0.203 mm (0.002-0.008 in).

  21. If the backlash is too large, install a thicker differential side gear shim and recheck the backlash.
  22. If the backlash is too small, use a thinner differential side gear shim and recheck the backlash.

Differential side gear shims are available in the following sizes:

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