Pinion Flange Runout Check - Circular

Driveline System

Component Tests


Pinion Flange Runout Check - Circular

1. Check the pinion flange for damage.

2. Position the Drive Pinion Flange Runout Gauge on the pinion flange.










3. Position the Driveshaft Clamp Plate onto the Drive Pinion Flange Runout Gauge.






4. Align the holes on the Driveshaft Clamp Plate with the holes in the pinion flange and install the bolts. Snug the bolts evenly.






5. 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 pinion flange with yellow paint.






6. If the flange runout exceeds 0.25 mm (0.010 in), remove the pinion flange, re-index the flange one-half turn on the pinion and reinstall it.

7. 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 in), install a new pinion flange.






8. 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.

Contact Pattern Location

In general, desirable ring gear tooth patterns must have the following characteristics:

- Drive pattern on the drive side ring gear well centered on the tooth
- Coast pattern on the coast side ring gear well centered on the tooth
- Clearance between the pattern and the top of the tooth
- No hard lines where the pressure is high

Acceptable ring gear tooth patterns for all axles.





Correct backlash with a thinner pinion position shim required.





Correct backlash with a thicker pinion position shim required.





Correct pinion position shim that requires a decrease in backlash.





Correct pinion position shim that requires an increase in backlash.