GM Service Manual Online
For 1990-2009 cars only

Checks

Action

Lubricant is contaminated

Drain and flush the axle housing thoroughly. Refill with the correct lubricant. Refer to Rear Axle Lubricant Replacement .

The clutch plates are deteriorated

Replace the clutch plates. Refer to Locking Differential Cam Unit Disassemble and Symptoms - Locking/Limited Slip Rear Axle .