Backlash & Final Assembly
- Check backlash at 4 locations around ring gear, using a dial indicator mounted to axle housing. Variation should not exceed 0.001" (.025 mm). If backlash is not within specifications, adjust side bearing shims as necessary.
CAUTION:
Total shim pack thickness must not be changed. If a shim is removed from 1 side, the same thickness shim must be added to the other side.
- After adjustment is completed, make a tooth contact pattern test, and make any necessary corrections. Install axle shafts and housing cover.
Courtesy of GENERAL MOTORS COMPANY
TIGHTENING SPECIFICATIONS
| Application |
Ft. Lbs. (N.m) |
| Ring Gear-to-Differential Case |
| |
7 1/2 Ring Gear |
90 (120) |
| |
8 1/2" Ring Gear |
80 (109) |
| |
8 7/8" Ring Gear |
60 (82) |
| |
9 1/2" Ring Gear |
110 (150) |
| Side Bearing Cap |
| |
7 1/2", 8 1/2" & 8 7/8" |
55 (75) |
| |
9 1/2" Ring Gear |
65 (88) |
| Pinion Shaft Lock Bolt |
20 (27) |
AXLE ASSEMBLY SPECIFICATIONS
| Application |
In. (mm) |
| Ring Gear Backlash |
.005-.008 (.13-.20) |
| Side Bearing Preload |
008 (.20) |
| Application |
INCH Lbs. (N.m) |
| Pinion Bearing Preload |
| |
7 1/2" Ring Gear |
| |
|
Used Bearings |
8-12 (1.0-1.4) |
| |
|
New Bearings |
24-32 (2.7-3.6) |
| |
8 1/2" & 8 7/8" Ring Gear |
| |
|
Used Bearings |
5-10 (.6-1.13) |
| |
|
New Bearings |
15-30 (1.7-3.4) |
| |
9 1/2" Ring Gear |
| |
|
Used Bearings |
5-15 (.6-1.7) |
| |
|
New Bearings |
20-25 (2.3-2.8) |