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Companion Flange Runout Check - Circular

WARNING: This page is about a different car, the 2002 Ford RV Cutaway, 2002 Ford Econoline, 2002 Ford E550 Super Duty, 2002 Ford E450 Super Duty, and 2002 Ford Cutaway. 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 installation.
  1. Raise the vehicle on a twin-post hoist that supports the rear axle.
  2. Remove the driveshaft. Refer to DRIVE SHAFTS .
  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
    G03404618Courtesy of FORD MOTOR CO.
  5. Position the Companion Flange Plate onto the Drive Pinion Flange Runout Gauge.
    Fig 2: Positioning Companion Flange Plate Onto Drive Pinion Flange Runout Gauge
    G03404619Courtesy of FORD MOTOR CO.
  6. Align the holes on the Driveshaft Clamp Plate with the holes in the pinion flange and install the bolts. Snug the bolts evenly.
    Fig 3: Aligning Holes On Driveshaft Clamp Plate With Holes In Pinion Flange
    G03404620Courtesy of FORD MOTOR CO.
  7. Position the Dial Indicator Gauge with Holding Fixture as shown. Turn the Drive Pinion Flange Runout Gauge, and locate and mark the high spot on the companion flange with yellow paint.
    Fig 4: Positioning Dial Indicator Gauge With Holding Fixture For Checking Companion Flange Runout
    G03404621Courtesy 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. Refer to REAR DRIVE AXLE/DIFFERENTIAL - DANA 60 & 70 , REAR DRIVE AXLE/DIFFERENTIAL - FORD 8.8- INCH or REAR DRIVE AXLE/DIFFERENTIAL - FORD 9.75 - INCH 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 Companion Flange Runout
    G03404622Courtesy of FORD MOTOR CO.
  9. If excessive runout is still evident after installation 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 DRIVE SHAFTS .
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