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Right Side Gear Backlash Adjustment

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    Fig 1: Right Side Locking Differential Clutch Disc Thrust Washer
    GM882850Courtesy of GENERAL MOTORS CORP.
  1. Install the locking differential clutch disc thrust washer.
    2. Fig 2: Right Side Cam Unit & Clutch Plate Assembly
    GM882834Courtesy of GENERAL MOTORS CORP.
  2. Install the locking differential cam unit.
    3. Fig 3: Installing Bolt And Washer Assembly Through Differential Case Half
    GM882845Courtesy of GENERAL MOTORS CORP.
    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.
  3. 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. Fig 4: Differential Case Components
    GM882827Courtesy of GENERAL MOTORS CORP.
    NOTE:

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

  6. Install the differential pinion gears, thrust washers and the locking differential spider into the case half.
    7. Fig 5: Measuring Differential Pinion Gear To Locking Differential Side Gear Backlash
    GM886762Courtesy of GENERAL MOTORS CORP.
  7. 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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