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 in Rear Drive Axle.

The clutch plates are deteriorated

Replace the clutch plates. Refer to Limited Slip Differential Disassemble and Limited Slip Differential Assemble .