Backlash Adjustment - GMC chervolet camaro 1999 Service Manual

4-42 Rear Drive Axle
J 8001
J39446
164245
Backlash Adjustment
Tools Required
J 8001 Dial Indicator Set
Drive line/Axle
1. Remove the rear axle housing cover. Refer to
Rear Cover and Gasket Replacement.
2. Rotate the differential case (1) several times in
order to seat the bearings.
3. Mount the J 8001.
4. Use a small button on the indicator stem in order
to make contact with the near heel end of
the tooth.
5. Set the J 8001 so that the following conditions
are met:
• The stem is in line with the gear rotation
• The stem is perpendicular to the tooth angle
6. Measure the backlash at three or four points
around the ring gear (3). Hold the drive pinion
gear stationary when checking backlash.
7. The lash must not vary over 0.05 mm (0.002 in)
around the ring gear (3). If the variation is over
0.05 mm (0.002 in), inspect for the following
conditions and correct as necessary:
• Burrs
• Uneven bolting conditions
• A distorted case flange
8. The backlash at the point of minimum lash should
I
be 0.13--0.23 mm (0.005--0.009 in) for all new \
gears. Adjust the backlash as necessary by
increasing the thickness of one bearing shim and
decreasing the thickness of the other bearing
shim by the same amount.
Transfer 0.05 mm (0.002 in) in bearing shim
thickness for each 0.03-mm (0.001-in) change in
backlash desired.
For example, use the following steps in order to
decrease the backlash by 0.03 mm (0.001 in):
8.1. Decrease the thickness of the right bearing
shim by 0.05 mm (0.002 in).
8.2. Increase the thickness of the left bearing
shim by 0.05 mm (0.002 in). Refer to Side
Bearing Preload Adjustment for further
information.
9. Install the rear axle housing cover. Refer to Rear
Cover and Gasket Replacement.
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