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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1585 (Rear Drive Axle) >> Repair Instructions >> Locking Differential Adjustment (10.5 Inch Axle) >> Right Side Gear Backlash Adjustment

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 differential side gear cam unit and clutch pack assembly.
    3. NOTE: 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.
  3. Assemble a set of washers, a nut, and a bolt long enough in order to hold the side gear in place.
    4. Fig 3: Installing bolt & Washer Assembly Through Differential Case Half
    GM882845Courtesy of GENERAL MOTORS CORP.
  4. Install the bolt and washer assembly through the differential case half.
  5. Install a second set of washers and the nut onto the bolt extending through the differential case half.
  6. Install the differential case half into a vise.
  7. Clamp on the nut on the bottom of the differential case.
    8. Fig 4: Installing Differential Pinion Gears
    GM882859Courtesy of GENERAL MOTORS CORP.
  8. Install the differential pinion gears, the differential pinion gear thrust washers and the locking differential spider into the case half.
  9. Loosen the bolt in order to turn the differential side gear.
  10. Index the pinion gear so that one tooth is pointing downward, perpendicular to the case half face.
  11. Tighten the bolt until the clutch plates are compressed.
    12. NOTE: In the following procedure, DO NOT unseat the locking differential spider. This will make the backlash reading inaccurate.
  12. 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.
  13. 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).
  14. If the backlash is too large, install a thicker locking differential side gear thrust washer and recheck the backlash.
  15. If the backlash is too small, use a thinner locking differential side gear thrust washer and recheck the backlash.
  16. Locking differential side gear 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)
    • 1.067 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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