Ring Gear-to-Differential Drive Pinion Gear Backlash

^ Tool Required:
- J 8001 Dial Indicator Set

REMOVE OR DISCONNECT
- Rear axle housing cover.

Measure





1. Rotate differential case (33) several times to seat bearings. Mount J 8001.
a. Use a small button on indicator stem so that contact can be made near heel end of tooth.
b. Set J 8001 so that stem is in line with gear rotation and perpendicular to tooth angle for accurate backlash reading.
2. Check backlash at three or four points around ring gear (20).
a. Lash must not vary over 0.05 mm (0.002 inch) around ring gear (20).
b. Drive pinion gear must be held stationary when checking backlash.

Important:
- If variation is over 0.05 mm (0.002 inch), check for burrs, uneven bolting conditions or - distorted case flange and make corrections as necessary.

Adjust
1. Backlash at the point of minimum lash should be between 0.13 mm and 0.23 mm (0.005 inch and 0.009 inch) for all new gears.
2. Backlash by increasing thickness of one bearing shim and decreasing thickness of other bearing shim the same amount.
- For each 0.03 mm (0.001 inch) change in backlash desired, transfer 0.05 mm (0.002 inch) in bearing shim thickness.
- To decrease backlash 0.03 mm (0.001 inch), decrease thickness of right bearing shim 0.05 mm (0.002 inch) and increase thickness of left bearing shim 0.05 mm (0.002 inch). To increase backlash 0.05 mm (0.002 inch), increase thickness of right bearing shim 0.10 mm (0.004 inch) and decrease thickness of left bearing shim 0.10 mm (0.004 inch).
- Refer to "DIFFERENTIAL BEARING PRELOAD ADJUSTMENT," in the following procedure for further information.

INSTALL OR CONNECT
- Rear axle housing cover.