Operation CHARM: Car repair manuals for everyone.

Trac-Lok Differential Noise

The most common problem is a chatter noise when turning corners. Before removing a TRAC-LOK'!R unit for repair, drain, flush and refill the axle with the specified lubricant. Refer to Lubricant change.
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.