GM Service Manual Online
For 1990-2009 cars only

Review the system and operation in order to familiarize yourself with the system functions. Refer to Locking Differential Description and Operation.

Visual/Physical Inspection

    â€¢ Inspect the system for the following:
       - Loose or missing fasteners
       - Obvious damage or conditions which may cause the symptom.
    â€¢ Check the system for proper operation. Refer to Locking Differential Diagnosis .

Symptom List

Refer to a system diagnostic procedure from the following list in order to diagnose the symptom:

    â€¢  Locking Rear Axle Does Not Lock
    â€¢  Locking Rear Axle Locks in Turns
    â€¢  Locking Rear Drive Axle Chatters in Turns
    â€¢  Noise in Addition to Normal Clutch Engagement