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Home >> Buick >> 2007 >> Lucerne CX >> Repair and Diagnosis >> External Pages >> Different car >> Section 235 (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 2006 Pontiac Montana SV6, 2006 Chevrolet Uplander, and 2006 Buick Terraza. 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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