Limited Slip Differential Operation Check

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A limited slip differential can be checked for correct operation without removing it from the rear axle housing.

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

Fig 1: Differential Clutch Gauge

Courtesy of FORD MOTOR CO.

Use a torque wrench with the 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: Checking Breakaway Torque

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 - DANA 60 AND 70 article.