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Home >> Chevrolet >> 2020 >> Express 2500 LS, 6.0L Eng VIN G >> Repair and Diagnosis >> External Pages >> Different car >> Section 45 (Rear Drive Axle) >> Repair Instructions >> Locking Differential Adjustment (9.5 LD Inch Axles) >> Left Side Gear Backlash Adjustment

Left Side Gear Backlash Adjustment

WARNING: This page is about a different car, the 2019 GMC Savana 3500, 2019 GMC Savana 2500, 2019 Chevrolet Express 3500, and 2019 Chevrolet Express 2500. However, it is still accessible from the selected car via links, so may be relevant.
  1. GM790754

    Install the new locking differential clutch disc thrust washer.

  2. GM790759

    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. GM790348

    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 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)
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