Operation CHARM: Car repair manuals for everyone.

Trac-Lok/Power-Lok Differential Noise

The most common problem is a chatter noise when turning corners. Before removing a Trac-lok/Power-lok unit for repair, drain, flush and refill the axle with the specified lubricant.
A container of Mopar Trac-lok Lubricant (friction modifier) should be added after repair service or during a lubricant change.
After changing the lubricant, drive the vehicle and make 10 to 12 slow, figure-eight turns. This maneuver will pump lubricant through the clutches. This will correct the condition in most instances. If the chatter persists, clutch damage could have occurred.