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Locking Rear Axle Does Not Lock

WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2007 GMC Yukon XL, 2007 GMC Yukon, 2007 Chevrolet Tahoe, 2007 Chevrolet Suburban, and 2007 Chevrolet Avalanche. 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, 9.5 Inch Axles)  and Locking Differential Assemble (9.5 Inch Axle) .
Flyweights in the governor assembly are stuck closed Replace the governor assembly and the latching bracket. Refer to Locking Differential Disassemble (8.6, 9.5 Inch Axles)  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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