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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 >> Locking Differential Assemble (8.6, 9.5, 11.5 Inch Axles)

Locking Differential Assemble (8.6, 9.5, 11.5 Inch Axles)

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.
NOTE: The left and right side gear backlash and thrust block thickness measurement must be completed before the components of the locking differential can be assembled.
    Fig 1: View Of Left Side Gear Thrust Washer
    GM790754Courtesy of GENERAL MOTORS CORP.
  1. Install the left side gear thrust washer.
    2. Fig 2: View Of Left Side Gear Cam Unit & Clutch Disc Assembly
    GM790759Courtesy of GENERAL MOTORS CORP.
  2. Install the left side gear cam unit and clutch disc assembly.
  3. Install the right side gear thrust washer.
  4. Install the right side clutch disc assembly.
  5. Install the right side gear.
    6. NOTE:
    • If the original pinion gears and thrust washers are being re-used, install the pinion gears and thrust washers on the same side as when removed.
    • Place the pinion gears and the pinion thrust washers 180 degrees apart.
  6. Install the pinion gear and the pinion thrust washers.
  7. Rotate the pinion gears and the pinion thrust washers 90 degrees and align the pinion gears with the pinion shaft opening in the differential case.
    8. NOTE: The open side of the thrust block must face the window opening.
  8. Install the thrust block.
    9. NOTE: Tighten the pinion shaft lock bolt finger tight.
  9. Install the pinion shaft and the NEW lock bolt.
    10. Fig 3: Identifying Governor Bushing
    GM790767Courtesy of GENERAL MOTORS CORP.
  10. Install the governor assembly.
  11. Using a hammer and a brass drift, install the governor bushing until there is 0.25-1.27 mm (0.010-0.050 in) of shaft end play.
    12. Fig 4: Identifying Latching Bracket Bushing
    GM790769Courtesy of GENERAL MOTORS CORP.
    NOTE: The straight end of the latching bracket spring must be over and outside the governor assembly shaft.
  12. Install the latching bracket assembly.
  13. Using a hammer and a brass drift, install the latching bracket bushing until there is 0.000-0.051 mm (0.000-0.002 in) of shaft end play.
    14. CAUTION: Refer to Fastener Caution .
  14. Tighten the pinion shaft lock bolt to.
    • For the 8.6 inch axle, tighten the bolt to 36 N.m (27 lb ft).
    • For the 9.5LD axle, tighten the bolt to 50 N.m (37 lb ft).
  15. Install the ring gear, if necessary. 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) .
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