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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1331 (Rear Drive Axle) >> Repair Instructions >> Differential Carrier Bearing Preload Adjustment (10.5/11.5 Inch Axles) >> Adjustment Procedure

Adjustment Procedure

WARNING: This page is about a different car, the 2009 GMC Sierra, 2009 GMC Cab & Chassis Sierra, 2009 Chevrolet Silverado, and 2009 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
  1. Install the pinion gear bearing retainer or the drive pinion, for the 10.5. Refer to Drive Pinion Housing and/or Seal Replacement .
  2. Install the differential drive pinion, for the 11.5 inch axle. Refer to Drive Pinion and Ring Gear Replacement (8.6, 9.5/9.5 LD, and 11.5 Inch Axles)  or Drive Pinion and Ring Gear Replacement (10.5 Inch Axle) .
  3. Install the differential side bearings, if necessary. Refer to Differential Side Bearings Replacement .
  4. Install the differential side bearing adjuster nuts.
    5. NOTE: Before installation of the differential case assembly, ensure that the side bearing surfaces in the carrier are clean and free of burrs. If the original bearings are to be reused, the original bearing cups must also be used.
    NOTE: If the differential case assembly cannot be installed, turn the differential side bearing adjuster nuts into the axle housing until the differential case assembly can be installed.
  5. Install the differential case assembly.
    6. NOTE: Tighten the bearing cap bolt finger-tight. DO NOT torque the bearing cap bolts at this time.
  6. Install the differential bearing caps and bolts.
    7. NOTE: Do not force the differential ring gear into contact with the drive pinion.
    NOTE: If the zero backlash cannot be obtained, turn the right side differential bearing adjuster nut in towards the rear axle housing until the differential ring gear fully contacts the drive pinion to obtain the zero backlash.
  7. To establish the zero backlash point, slide the differential case assembly towards the right side axle housing until the ring gear contact the pinion.
  8. Using the J 24429:  spanner and holding the holding the differential ring gear against the drive pinion, turn the left differential bearing adjuster nut out from the axle housing until it contacts the differential side bearing.
  9. Using the J 24429:  spanner, turn the right differential bearing adjuster nut out from the axle housing until it contacts the differential side bearing.
  10. Using the J 24429:  spanner, back off the left adjusting nut approximately 2 slots in order to obtain the initial backlash adjustment.
    11. NOTE: Do not torque the adjuster lack bolt at this time.
  11. Install the left adjuster nut lock and the adjuster nut lock bolt.
  12. Using the J 24429:  spanner, firmly tighten the right differential bearing adjuster nut in order to force the differential case assembly into solid contact with the left differential adjuster nut.
  13. Rotate the pinion several times in order to seat the bearings.
  14. Using the J 24429:  spanner, loosen the right differential bearing adjuster nut until the nut is free from the differential side bearing.
  15. Using the J 24429:  spanner, tighten the right differential bearing adjuster nut until the differential bearing adjuster nut contacts the bearing.
  16. Once the right differential bearing adjuster contacts the differential bearing, tighten the differential bearing adjuster nut. using the J 24429  the following additional amounts. See Special Tools .
  17. Using the J 24429:  spanner, tighten the differential bearing adjuster nut an additional 2 slots for used bearings or an additional 3 slots for new bearings.
  18. Install the right differential bearing adjuster nut lock.
    19. NOTE: Do not torque the bolt at this time.
  19. Install the right differential bearing adjuster nut lock bolt.
    20. CAUTION: Refer to Fastener Caution .
  20. Tighten the bearing cap bolts to 185 N.m (136 lb ft). for the 8.6 inch axle or 207 N.m (153 lb ft) for the 11.5 inch axle.
  21. Tighten differential bearing adjuster nut lock bolts to 27 N.m (20 lb ft).
  22. Measure the ring gear to pinion backlash and adjust, if necessary. Refer to Backlash Adjustment (8.6 Inch Axle)  or Backlash Adjustment (10.5/11.5 Inch Axle)  or Backlash Adjustment (9.5 LD Axle) .
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