Traction-Lok Differential Operation Check

Differential Check - Traction-Lok Road Test (Ford)
1. Place one wheel on a dry surface and the other wheel on ice, mud or snow.
2. Gradually open the throttle to obtain maximum traction prior to break away. The ability to move the vehicle demonstrates correct operation of a Traction-Lok rear axle assembly.
3. When starting with one wheel on an excessively slippery surface, a slight application of the parking brake may be necessary to help energize the Traction-Lok feature of the differential. Release the brake when traction is established. Use light throttle on starting to provide maximum traction.
4. If, with unequal traction, both wheels slip, the limited slip rear axle has done all it can possibly do.
5. In extreme cases of differences in traction, the wheel with the least traction may spin after the Traction-Lok has transferred as much torque as possible to the non-slipping wheel.

Differential Check - Tractech Truetrac (Dana)
1. Shift the transmission into NEUTRAL.
2. Raise and support the vehicle.
3. Spin either rear wheel.
Both wheels must spin with a fluid motion. Any feeling of gripping and release/roughness indicates that additional inspection of the axle assembly is necessary.
4. Shift the transmission into gear.
5. Spin either rear wheel.
The other wheel must spin with a fluid motion in the opposite direction and at the same speed of the wheel being spun. Any feeling of gripping and release/roughness indicates that further inspection of the axle assembly is necessary.

Differential Check - Trac-Lok Road Test (Dana)
1. Drive the vehicle for at least ten miles to warm up the axle lubricant. More miles may be necessary depending on the outside temperature.
2. Drive the vehicle in a tight circle for five minutes and then in the opposite direction for another five minutes.
3. Make a minimum of ten figure-eight turns.
4. If chatter is still present, drain and refill the axle with the specified type and amount of lubricant and friction modifier.
5. Carry out the road test again.
There might be a slight chatter. If the chatter persists after 160 km (100 miles) of vehicle operation, install a new differential.