Trac-Lok Differential

DIAGNOSIS AND TESTING - TRAC-LOK
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. A container of Mopar Trac-Lok(R) 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.

DIFFERENTIAL TEST
The differential can be tested without removing the differential case by measuring rotating torque. Make sure brakes are not dragging during this measurement.
1. Place blocks in front and rear of both front wheels.
2. Raise one rear wheel until it is completely off the ground.
3. Engine off, transmission in neutral, and parking brake off.
4. Remove wheel and bolt Special Tool 6790 or equivalent tool to studs.





5. Use torque wrench on special tool to rotate wheel and read rotating torque (Fig. 31).
6. If rotating torque is less than 22 Nm (30 ft. lbs.) or more than 271 Nm (200 ft. lbs.) on either wheel the unit should be serviced.