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Locking Rear Axle Does Not Lock

WARNING: This page is about a different car, the 2007 GMC Sierra and 2007 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.
Locking Rear Axle Does Not Lock

Checks Action
Little or no preload on the latching bracket Replace the governor assembly and the latching bracket. Refer to Locking Differential Disassemble (8.6, 9.5LD Axles)  and Locking Differential Cam Unit Disassemble (9.5 Inch Axle) .
Flyweights in the governor assembly are stuck closed Replace the governor assembly and the latching bracket. Refer to Locking Differential Assemble (9.5 Inch Axle)  and Locking Differential Assemble (9.5 Inch Axle) .
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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