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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1014 (Rear Drive Axle) >> Repair Instructions >> Differential Replacement (8.6, 9.5/9.5LD Inch Axles) >> Installation Procedure

Installation Procedure

WARNING: This page is about a different car, the 2008 GMC Sierra, 2008 GMC Cab & Chassis Sierra, 2008 Chevrolet Silverado, and 2008 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
  1. Install the ring gear, if necessary. Refer to Drive Pinion and Ring Gear Replacement (8.6, 9.5/9.5LD, and 11.5 Inch Axles)  or Drive Pinion and Ring Gear Replacement (10.5 Inch Axle) .
  2. Install the differential side bearings, if necessary. Refer to Differential Side Bearings Replacement (All Except 9.75 Inch Axle) .
  3. Lubricate the differential side bearings with axle lubricant. Use the proper fluid. Refer to Fluid and Lubricant Recommendations .
    4. Fig 1: View Of Differential Case And Axle Housing
    GM667660Courtesy of GENERAL MOTORS CORP.
  4. Place the case, with the bearing cups installed, into the axle housing.

    Support the case in order to keep the case from falling out of the axle housing.

    5. Fig 2: Removing/Installing Bearing Cap Bolt
    GM667502Courtesy of GENERAL MOTORS CORP.
  5. Install the bearing caps and the bolts. Do not torque the bearing cap bolts at this time.
  6. Adjust the differential side bearing preload. Refer to Differential Carrier Bearing Preload Adjustment (10.5 Inch, 11.5 Inch Axles)  or Differential Carrier Bearing Preload Adjustment (8.6 Inch Axle)  or Differential Carrier Bearing Preload Adjustment (9.5, and 9.5LD Inch Axles) .
  7. Adjust the backlash. Refer to Backlash Adjustment (8.6 Inch Axle)  or Backlash Adjustment (10.5, 11.5 Inch Axles)  or Backlash Adjustment (9.5 LD Axle) .
  8. Perform a gear tooth contact pattern check. Refer to Gear Tooth Contact Pattern Inspection .
    9. NOTE: Refer to Fastener Notice .
  9. Tighten the bearing cap bolts.

    Tighten: 

    • For the 8.6 inch axle, tighten the bearing cap bolts to 75 N.m (55 lb ft)
    • For the 9.5/9.5LD inch axle, tighten the bearing cap bolts to 85 N.m (63 lb ft)

  10. Install the axle shafts. Refer to Rear Axle Shaft Replacement (8.6 Inch Axle w/Drum Brake w/VSES)  or Rear Axle Shaft Replacement (8.6 Inch Axle w/Drum Brakes w/o VSES)  or Rear Axle Shaft Replacement (8.6, 9.5 Inch Axles w/VSES) .
  11. Fill the axle with the proper lubricant. Refer to Rear Axle Lubricant Replacement (8.6 Inch Axle)  or Rear Axle Lubricant Replacement (9.5 Inch LD Axle)  or Rear Axle Lubricant Replacement (10.5 Inch Axle) .
  12. Lower the vehicle.
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