Traction-Lok(R) Differential Operation Check - Vehicles with 8.8 Axle

WARNING: This page is about a different car, the 2002 Ford RV Cutaway, 2002 Ford Econoline, 2002 Ford E550 Super Duty, 2002 Ford E450 Super Duty, and 2002 Ford Cutaway. However, it is still accessible from the selected car via links, so may be relevant.

A Traction-Lok(R) differential can be checked for correct operation without removing it from the rear axle housing (4010).

WARNING: A vehicle equipped with a Traction-Lok(R) differential will always have both wheels driving. If only one wheel is raised off the floor and the rear axle is driven by the engine, the wheel on the floor could drive the vehicle off the stand or jack. Be sure both rear wheels are off the floor.

Raise only one rear wheel. Install the Differential Clutch Gauge on the wheel lugs.

Fig 1: Installing Differential Clutch Gauge On Wheel Lugs

Courtesy of FORD MOTOR CO.

Use a torque wrench with a capacity of at least 271 N.m (200 lb-ft) to rotate the axle shaft. Be sure that the transmission is in NEUTRAL, and that one rear wheel is on the floor while the other rear wheel is raised off the floor. The breakaway torque required to start rotation must be at least 27 N.m (20 lb-ft). The initial breakaway torque may be higher than the continuous turning torque.

Fig 2: Rotating Axle Shaft With Torque Wrench

Courtesy of FORD MOTOR CO.

The axle shaft must turn with even pressure throughout the check without slipping or binding. If the torque reading is less than specified, check the differential case. Refer to REAR DRIVE AXLE/DIFFERENTIAL - FORD 8.8- INCH .