GMC chervolet camaro 1999 Service Manual page 467

4-52 Rear Drive Axle
7
5
6
375039
DrivelineJAxle
Adjustments Affecting Tooth Contact
The following two adjustments will affect the tooth
contact pattern:
• An adjustment to the backlash
• An adjustment to the position of the drive pinion
gear (7) in the rear axle housing
The effects of bearing preloads are not readily
apparent on hand-loaded tooth contact pattern tests.
Use differential bearing shims (6) in order to adjust the
backlash. The shims (6) move the entire differential (5)
closer to or farther from the drive pinion gear (7).
You can also use bearing shims (2) can in order to set
both the differential bearing preload and the pinion
depth (1).
• Make the following changes in order to increase
the backlash:
- Increase the thickness of the right bearings
shim (6)
- Decrease the thickness of the left bearing
.shim(3)
• Make the following changes in order to decrease
the backlash:
- Decrease the thickness of the right bearings
shim (6)
- Increase the thickness of the left bearing
shim (3)
You can adjust the position of the drive pinion gear (1)
by changing the thickness of the shims (2) between (
the following components:
• The drive pinion gear head (7)
• The race of the differential drive pinion gear inner
bearing
The drive pinion gear shim (2) is used in the rear axle
in order to compensate for manufacturing tolerances.
• Increasing the shim thickness moves the drive
pinion gear (7) closer to the centerline of the
differential ring gear (4).
• Decreasing shim thickness moves the drive pinion
gear (7) farther away from the centerline of the
differential ring gear (4).
(