LEMON Manuals: Even more car manuals for everyone
Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 339 (Rear Drive Axle) >> Repair Instructions >> Locking Differential Adjustment (8.6, 9.5LD Inch Axles) >> Left Side Gear Backlash Adjustment

Left Side Gear Backlash Adjustment

WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2011 GMC Yukon XL, 2011 GMC Yukon, 2011 Chevrolet Tahoe, 2011 Chevrolet Suburban, and 2011 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.
    Fig 1: Left Side Gear Thrust Washer
    GM790754Courtesy of GENERAL MOTORS CORP.
  1. Install the new locking differential clutch disc thrust washer.
    2. Fig 2: Left Side Gear Cam Unit And Clutch Disc Assembly
    GM790759Courtesy of GENERAL MOTORS CORP.
  2. Install the locking differential side gear cam unit and clutch disc assembly.
    3. NOTE:

    Align the openings of the differential pinion gears and the differential pinion gear thrust washer to the pinion shaft opening in the differential case.

  3. Install the differential pinion gears with the differential pinion gear thrust washers into the differential case.
    4. NOTE:
    • It may be necessary to press down on the locking differential side gear cam unit in order to align the pinion gear shaft opening with the pinion shaft opening in the differential case.
    • If the pinion shaft cannot be installed after pressing on the locking differential side gear cam unit, replace the locking differential clutch disc gear thrust washer with a thinner washer.
    • Tighten the pinion shaft lock bolt finger tight.
  4. Install the pinion shaft and the bolt.
  5. Rotate the pinion gear closest to the lock bolt so that one of the teeth is pointing downward, square to the ring gear flange.
  6. Install a brass drift between the locking differential side gear cam unit and the pinion shaft.
  7. Press the brass drift in far enough in order to compress the clutch discs.
    8. Fig 3: Measuring Backlash Of Differential Pinion Gear & Side Gear
    GM790348Courtesy of GENERAL MOTORS CORP.
  8. Measure the backlash of the differential pinion gear and the locking differential side gear cam unit by doing the following:
    1. Install the J 7872  base (1) and the J 8001  indicator (2) to the ring gear flange.
    2. Place the contact pad of the J 8001  indicator (2) on one of the teeth of the pinion gear closest to the pinion shaft lock bolt and zero the gauge.
    3. Pull the pinion gear firmly into the differential case seat.
    4. Rotate the pinion gear back and forth.
      5. NOTE:
      • If the backlash is greater than, install a thicker locking differential clutch disc thrust washer and recheck the backlash.
      • If the backlash is less than, install a thinner locking differential clutch disc thrust washer and recheck the backlash
    5. The backlash between the differential pinion gear and the locking differential side gear cam unit should be:
      • For the 8.6 inch axle, 0.254-0.406 mm (0.010-0.016 in).
      • For the 9.5 LD axle, 0.279-0.432 mm (0.011-0.017 in).
  9. Locking differential clutch disc thrust washers are available in the following sizes:

    Washer Sizes 

    • 0.559 mm (0.022 in)
    • 0.686 mm (0.027 in)
    • 0.813 mm (0.032 in)
    • 0.914 mm (0.036 in)
    • 1.016 mm (0.040 in)
    • 1.118 mm (0.044 in)
    • 1.219 mm (0.048 in)
    • 1.321 mm (0.052 in)
scientia non olet · About LEMON Manuals