Traction-Lok® Differential Operation Check

WARNING: This page is about a different car, the 2007 Ford Ranger. However, it is still accessible from the selected car via links, so may be relevant.

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

WARNING: Vehicle may have multiple drive wheels. Do not use engine to power the driveline unless all drive wheels are elevated off the ground. Drive wheels in contact with ground could cause unexpected vehicle movement. Failure to follow this instruction may result in serious personal injury.

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

Use a torque wrench with a capacity of at least 271 Nm (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 break away torque required to start rotation must be at least 27 Nm (20 lb-ft). The initial break away torque may be higher than the continuous turning torque.

Fig 1: Identifying Axle Shaft

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 7.5-INCH RING GEAR article or REAR DRIVE AXLE/DIFFERENTIAL - FORD 8.8-INCH RING GEAR article.

Fig 2: Rotating Axle Shaft Even Pressure

Courtesy of FORD MOTOR CO.