DIFFERENTIAL - TRAC-LOK
OPERATION
The differentials clutches (6) (8) are engaged by two
concurrent forces. The first being the preload force
exerted through Belleville spring washers within the
clutch packs. The second is the separating forces gen-
erated by the side gears (7) as torque is applied
through the ring gear.
This design provides the differential action needed for
turning corners and for driving straight ahead during
periods of unequal traction. When one wheel looses
traction, the clutch packs transfer additional torque to
the wheel having the most traction. This differential
resist wheel spin on bumpy roads and provide more
pulling power when one wheel looses traction. Pulling
power is provided continuously until both wheels loose
traction. If both wheels slip due to unequal traction,
Trac-lok
T
operation is normal. In extreme cases of dif-
ferences of traction, the wheel with the least traction
may spin.
DIAGNOSIS AND TESTING
DIFFERENTIAL-TRAC-LOK
The most common problem is a chatter noise when
turning corners. Before removing the unit for repair,
drain, flush and refill the axle with the specified lubri-
cant. Add a container of Mopar Limited Slip Additive
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 cor-
rect the condition in most instances. If the chatter per-
sists, clutch damage could have occurred.
The differential can be tested without removing the dif-
ferential 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 (1) or equivalent tool to studs.
5. Use torque wrench (2) on special tool to rotate wheel and read rotating torque.
3 - 136
REAR AXLE - 9 1/4
ND