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Section 6 (Differential - Positive Traction): Testing

WARNING: This page is about a different car, the 1991 Pontiac Firebird, 1991 Oldsmobile Custom Cruiser, 1991 Chevrolet Caprice, 1991 Chevrolet Camaro, and 1991 Buick Roadmaster. However, it is still accessible from the selected car via links, so may be relevant.
  1. Place transmission in Park. Raise rear of vehicle until both wheels are off ground. Remove rear wheel. Attach Adapter (J-2619-01) to axle shaft flange. Install 1/2" coarse-thread bolt into adapter. Attach torque wrench to adapter. See Fig 1 .
  2. Measure torque required to rotate opposite wheel assembly. The reading should be 125-225 ft. lbs. (169-305 N.m). Lower vehicle so that one wheel is on ground. Place transmission in Neutral.
  3. Check torque to rotate remaining wheel. Reading should be 45-110 ft. lbs. (61-149 N.m). Replace differential assembly if not within specifications.
    Fig 1: Testing Differential in Vehicle
    G95C13039Courtesy of GENERAL MOTORS CORP.
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