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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 (10.5 Inch Axle) >> Right Side Gear Backlash Adjustment

Right 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. GM882850

    Install the locking differential clutch disc thrust washer.

  2. GM882834

    Install the locking differential cam unit.

  3. GM882845
    NOTE:
    • The bolt must be long enough to hold the differential side gear in place and to allow the use of washers and nut.
    • The washers must be the proper size in order to fit over the differential side gear, but without causing interference with the with the differential pinion gear and differential spider assembly.
    • Tighten the nut and bolt just enough compress the clutch disc but will allow locking differential side gear to rotate.

    Install the long bolt, washers and nut

  4. Install the differential case half into a vise.
  5. Clamp on the nut on the bottom of the differential case.
  6. GM882827
    NOTE:

    Index the pinion gear so that one tooth is pointing downward, square to the case half face.

    Install the differential pinion gears, thrust washers and the locking differential spider into the case half.

  7. GM886762

    Install the J-7872  base and the J-8001  indicator on the differential case.

    8. NOTE:

    Preload the dial of the J-8001  indicator approximately one turn clockwise.

  8. Adjust the J-8001  indicator on the tooth that is square to the differential side gear and set the J-8001  indicator to zero
    9. NOTE:

    In the following procedure, DO NOT unseat the locking differential spider. This will make the backlash reading inaccurate.

  9. 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.
    • Record the measurement.
    10. NOTE:

    Measure the differential pinion gear to locking differential side gear backlash on the remaining differential pinion gears following the steps above.

  10. The backlash between the differential pinon gear and locking differential side gear should be between 0.279 - 0.432 mm (0.011 - 0.017 in).
    11. NOTE:
    • If the backlash is greater than, install a thicker differential side gear shim and recheck the backlash.
    • If the backlash is less than, use a thinner differential side gear shim and recheck the backlash.
  11. Differential side gear shims 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)
    • 1.067 mm (0.042 in)
    • 1.118 mm (0.044 in)
    • 1.219 mm (0.048 in)
    • 1.321 mm (0.052 in)
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