Service Hints: Notes

How to inspect the pattern:

1. Brush gear marking compound on the ring gear teeth.
2. Rotate the pinion clockwise 10 times.
3. Rotate the pinion counterclockwise 10 times.
4. Observe the tooth contact pattern. Make any necessary corrections.

Fig 1: Loosening Bearing On Pinion

Courtesy of GENERAL MOTORS CORP.

Condition

• The backlash is correct.
• The pinion depth is correct (3) (4).

Loose bearings on the pinion or in the differential case may cause patterns that vary. Inspect the following preload settings:

• Total assembly
• Differential case
• Pinion

Fig 1: Correcting & Looking For Damage Or Incorrectly Assembled Parts

Courtesy of GENERAL MOTORS CORP.

If these settings are correct, look for damage or incorrectly assembled parts.

Condition

• The backlash is correct.
• The pinion depth is incorrect (3) (4).