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.