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Pinion Flange Runout Check -Circular

WARNING: This page is about a different car, the 2003 Ford Ranger. However, it is still accessible from the selected car via links, so may be relevant.
CAUTION: Pinion bearing preload must be reset if the pinion nut has been loosened or removed for pinion flange reindexing or replacement.
  1. Raise the vehicle on a twin-post hoist that supports the rear axle.
  2. Remove the driveshaft. For additional information, refer to DRIVESHAFT .
  3. Check the pinion flange for damage.
  4. Position the Drive Pinion Flange Runout Gauge on the pinion flange.
    Fig 1: Positioning Drive Pinion Flange Runout Gauge On Pinion Flange
    G01291186Courtesy of FORD MOTOR CO.
  5. Position the Driveshaft Clamp Plate onto the Drive Pinion Flange Runout Gauge.
    Fig 2: Positioning Driveshaft Clamp Plate Onto Drive Pinion Flange Runout Gauge
    G01291187Courtesy of FORD MOTOR CO.
  6. Align the holes on the Companion Flange Plate with the holes in the pinion flange and install the bolts. Snug the bolts evenly.
    Fig 3: Aligning Holes On Companion Flange Plate With Holes In Pinion Flange
    G01291188Courtesy of FORD MOTOR CO.
  7. Position the Dial Indicator Gauge Holding Fixture as shown. Turn the Drive Pinion Flange Runout Gauge, and locate and mark the high spot on the pinion flange with yellow paint.
    Fig 4: Positioning Dial Indicator Gauge Holding Fixture
    G01291189Courtesy of FORD MOTOR CO.

    If the flange runout exceeds 0.25 mm (0.010 inch), remove the pinion flange, reindex the flange one-half turn on the pinion, and reinstall it. For additional information, refer to REAR DRIVE AXLE/DIFFERENTIAL - FORD 7.5-INCH RING GEAR article, REAR DRIVE AXLE/DIFFERENTIAL - FORD 8.8-INCH RING GEAR article, or FRONT DRIVE AXLE/DIFFERENTIAL - DANA 35 article for the flange removal and installation procedures.

  8. Check the runout again. If necessary, rotate the flange until an acceptable runout is obtained. If the flange runout is still more than 0.25 mm (0.010 inch), install a new pinion flange.
    Fig 5: Checking Drive Pinion Flange Runout
    G01291190Courtesy of FORD MOTOR CO.
  9. If excessive runout is still evident after replacement of the pinion flange, install a new ring and pinion. Repeat the above checks until the runout is within specifications.
  10. Install the driveshaft. For additional information, refer to DRIVESHAFT .
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