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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1585 (Rear Drive Axle) >> Diagnostic Information and Procedures >> Locking Rear Axle Does Not Lock

Locking Rear Axle Does Not Lock

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.
Checks Action
Little or no preload on the latching bracket Replace the governor assembly and the latching bracket. Refer to Locking Differential Disassemble (10.5 Inch Axle)  or Locking Differential Disassemble (8.6/9.5LD /11.5 Inch Axles)  and Locking Differential Cam Unit Disassemble (8.6 Inch Axle)  or Locking Differential Cam Unit Disassemble (9.5 Inch Axle)  or Locking Differential Cam Unit Disassemble (10.5 Inch Axle)  or Locking Differential Cam Unit Disassemble (11.5 Inch Axle) .
Flyweights in the governor assembly are stuck closed Replace the governor assembly and the latching bracket. Refer to Locking Differential Assemble (10.5 Inch Axle)  or Locking Differential Assemble (8.6, 9.5, 11.5 Inch Axles)  and Locking Differential Assemble (10.5 Inch Axle)  or Locking Differential Assemble (8.6, 9.5, 11.5 Inch Axles) .
The drive teeth on the governor or cam gear assembly are broken Replace the cam plate, the governor assembly, and the latching bracket. Refer to the following:
Broken clutch plates Replace the clutch plates and the wave spring. Refer to the following:
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