Half-Round Companion Flange

CAUTION: Pinion bearing preload must be reset if the pinion nut has been loosened or removed for companion flange reindexing or replacement.

1. Raise the vehicle on a twin-post hoist that supports the rear axle.
2. Remove the driveshaft.
3. Check the companion flange for damage.
4. Insert the correct size Gauge Pin.





5. Position the Companion Flange Runout Gauge on the companion flange.





6. Align the holes on the gauge with the holes in the companion flange and install the bolts and nuts.





7. NOTE: Accurate tool setup will result in accurate final readings.

Position the Dial Indicator/Magnetic Base as shown. Adjust and lightly tighten the mounting bolts and nuts so the gauge runout is 0.254 mm (0.010 inch) or less.





8. Position the Dial Indicator on the edge of the gauge. Turn the Companion Flange Runout Gauge, and locate and mark the high spot on the companion flange with yellow paint.





If the flange runout exceeds 0.25 mm (0.010 inch), remove the companion flange, reindex the flange one-half turn on the pinion, and reinstall it.
9. Check the runout again. If necessary, reindex the flange until an acceptable runout is obtained. If the flange runout is still more than 0.25 mm (0.010 inch), replace the companion flange.





10. If excessive runout is still evident after replacement of the companion flange, replace the ring and pinion. Repeat the above checks until the runout is within specifications.
11. Install the driveshaft.