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Home >> GMC >> 2003 >> Safari Van Cargo, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1122 (Vibration Symptoms Diagnosis And Correction) >> Diagnostic Information and Procedures >> Differential Pinion Input Shaft Runout Measurement >> Measurement Procedure

Measurement Procedure

WARNING: This page is about a different car, the 2004 Pontiac Aztek and 2004 Buick Rendezvous. However, it is still accessible from the selected car via links, so may be relevant.
  1. Raise and suitably support the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.
  2. Remove the torque tube assembly from the vehicle. Refer to Torque Tube Assembly Replacement in Rear Drive Axle.
  3. Clean the surface of the first 25 mm (1 in) of the differential pinion input shaft splines from the end of the shaft.
  4. Mount a dial indicator set, J 7872  , or equivalent, and position the dial indicator to contact the differential pinion input shaft splines approximately 13 mm (1/2 in) from the end of the shaft.
  5. Rotate the differential pinion input shaft by hand to locate the low spot.
  6. Set the dial indicator to zero on the low spot.
  7. Rotate the differential pinion input shaft by hand and record the amount of radial runout.
  8. Compare the runout of the differential pinion input shaft to the following specification:

    Specification:  Differential pinion input shaft maximum allowable runout 0.05 mm (0.002 in).

  9. If the differential pinion input shaft runout exceeds the specification, the differential pinion assembly requires replacement.
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