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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 >> Drive Pinion and Ring Gear Replacement (8.6, 9.5/9.5 LD, and 11.5 Inch Axles) >> Installation Procedure

Installation Procedure

WARNING: This page is about a different car, the 2010 GMC Sierra, 2010 GMC Cab & Chassis Sierra, 2010 Chevrolet Silverado, and 2010 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
    Fig 1: Ring Gear & Differential Case
    GM866505Courtesy of GENERAL MOTORS CORP.
    NOTE: The mating surface of the ring gear and the differential case must be clean and free of burrs before installing the ring gear.
  1. Install the differential ring gear to the differential case.
    2. Fig 2: Identifying Ring Gear Bolts
    GM866503Courtesy of GENERAL MOTORS CORP.
    CAUTION: Refer to Fastener Caution .
    NOTE:
    • The ring gear bolts on the 8.6 inch and the 9.5/9.5LD inch axles have left-hand threads. The ring gear bolts on the 11.5 inch axle have right-hand threads.
    • Hand start each bolt to ensure that the ring gear is properly installed to the differential case.
    • Tighten the differential ring gear bolts alternately and in stages, gradually pulling the ring gear onto the differential case.
  2. Install the NEW differential ring gear bolts and tighten in sequence to 120 N.m (89 lb ft). for the 8.6 inch axle, 140 N.m (103 lb ft) for the 9.5/9.5LD inch axles and 237 N.m (175 lb ft). for the 11.5 inch axle.
  3. Install the pinion bearing cups. Refer to Differential Drive Pinion Gear Bearing Replacement (8.6, 9.5, 11.5 Inch Axle)  or Differential Drive Pinion Gear Bearing Replacement (10.5 Inch Axle) .
  4. Determine and install the selective shim thickness for the pinion gear. Refer to Pinion Depth Adjustment (8.6, 9.5/9.5 LD and 11.5 Inch Axles)  or Pinion Depth Adjustment (10.5 Inch Axle) .
  5. Install the inner pinion bearing to the pinion. Refer to Differential Drive Pinion Gear Bearing Replacement (8.6, 9.5, 11.5 Inch Axle)  or Differential Drive Pinion Gear Bearing Replacement (10.5 Inch Axle) .
  6. Install a new collapsible spacer.
  7. Lubricate the pinion bearings with axle lubricant. Refer to Fluid and Lubricant Recommendations (USA and Canada) .
  8. Install the outer differential pinion bearing, the NEW differential pinion oil seal and the differential yoke into the axle housing. Refer to Drive Pinion Flange/Yoke and/or Oil Seal Replacement .
  9. Install the differential case assembly. Refer to Differential Replacement (8.6, 9.5/9.5 LD Inch Axles)  or Differential Replacement (10.5 Inch, 11.5 Inch Axle) .
  10. Fill the axle with lubricant. Use the proper fluid. Refer to Differential Oil Replacement (10.5 Inch Axle)  or Differential Oil Replacement (11.5 Inch Axle)  or Differential Oil Replacement (8.6 Inch Axle)  or Differential Oil Replacement (9.5LD Inch Axle) .
  11. Remove the support and lower the vehicle.
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