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Chevrolet Silverado / GMC Sierra. Manual - part 1473
Check the sealing surface of the pinion flange/yoke for nicks, burrs or rough tool marks that
could damage the seal and cause an oil leak.
Check for worn or broken parts and replace as necessary.
REAR AXLE HOUSING INSPECTION
Carefully and thoroughly inspect all drive unit parts before assembly. Thorough inspection of the
drive parts for wear or stress with subsequent replacement of worn parts eliminates costly drive
component repair after assembly.
Inspect for nicks or burrs that could prevent the outer diameter of the pinion seal from
sealing. Remove any burrs.
Inspect the bearing cup bores for nicks or burrs. Remove any burrs that are found.
Inspect the housing for cracks. Replace the housing if any cracks are found.
Inspect the housing for foreign material such as metal chips, dirt, or rust.
SHIMS INSPECTION
Inspect the shims for cracks and chips. Replace the damaged shims.
PINION DEPTH ADJUSTMENT (10.5 INCH AXLE)
1. Install the differential, if necessary. Refer to Differential Replacement (8.6, 9.5/9.5LD
Inch Axles) or Differential Replacement (10.5 Inch, 11.5 Inch Axle).
2. Install the original shim to the pinion bearing retainer. If the original shim is not available,
install a 0.41 mm (0.016 in) shim to build pinion depth.
IMPORTANT:
Do not reinstall the original cast iron production shims, if
removed. Once the cast iron shims are removed from the
axle housing, they must be replaced with service shims and
spacers.
If service shims were previously installed, the shims can be
reused.
IMPORTANT: Measure and record the thickness of the pinion gear bearing
retainer shim before any service procedures are performed
to the pinion gear bearing retainer assembly.
2008 Chevrolet Silverado 1500
2008 Driveline/Axle Rear Drive Axle - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
3. Install the pinion gear bearing retainer.
4. Install the pinion gear bearing retainer bolts.
Tighten: Tighten the pinion gear bearing retainer bolts to 88 N.m (65 lb ft).
5. Adjust the backlash. Refer to Backlash Adjustment (8.6 Inch Axle) or Backlash
Adjustment (10.5, 11.5 Inch Axles) or Backlash Adjustment (9.5 LD Axle).
6. Perform a gear tooth pattern check on the pinion and the ring gear. Refer to Gear Tooth
Contact Pattern Inspection.
7. If the gear tooth contact pattern indicates a high or a low flank contact pattern, adjust the
pinion depth by doing the following:
1. Remove the pinion gear bearing retainer bolts.
2. Remove the pinion gear bearing retainer.
3. Remove the shim.
If the gear tooth contact pattern shows a high flank contact pattern, install a shim
one size larger.
If the gear tooth contact pattern shows a low flank contact pattern, install a shim
one size smaller.
4. Install the new shim to the pinion gear bearing retainer.
5. Install pinion gear bearing retainer.
6. Install pinion gear bearing retainer bolts.
Tighten: Tighten the pinion gear bearing retainer bolts to 88 N.m (65 lb ft).
7. Inspect the gear tooth contact pattern of the pinion and the ring gear. Refer to Gear
Tooth Contact Pattern Inspection .
8. If the gear tooth pattern is still incorrect, adjust the shim thickness as necessary and
recheck the gear tooth pattern of the pinion and the ring gear.
8. Inspect the backlash between the pinion and the ring gear and adjust, if necessary. Refer to
Backlash Adjustment (8.6 Inch Axle) or Backlash Adjustment (10.5, 11.5 Inch Axles)
or Backlash Adjustment (9.5 LD Axle).
IMPORTANT: Do not apply sealant to the pinion gear bearing retainer at
this time.
NOTE:
Refer to Fastener Notice .
2008 Chevrolet Silverado 1500
2008 Driveline/Axle Rear Drive Axle - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
The pinion shims are available in the following sizes:
Shim Sizes
0.15 mm (0.006 in)
0.18 mm (0.007 in)
0.20 mm (0.008 in)
0.23 mm (0.009 in)
0.25 mm (0.010 in)
0.28 mm (0.011 in)
0.30 mm (0.012 in)
0.33 mm (0.013 in)
0.36 mm (0.014 in)
0.38 mm (0.015 in)
0.41 mm (0.016 in)
0.43 mm (0.017 in)
0.46 mm (0.018 in)
0.48 mm (0.019 in)
0.51 mm (0.020 in)
0.53 mm (0.021 in)
0.56 mm (0.022 in)
0.58 mm (0.023 in)
0.61 mm (0.024 in)
PINION DEPTH ADJUSTMENT (8.6, 9.5/9.5LD, AND 11.5 INCH AXLES)
Tools Required
J 45108 Pinion Setting Gage Block (9. See Special Tools.5/9.5LD inch Axle)
J 21777-86 Side Bearing Disc (9. See Special Tools.5/9.5LD inch Axle, 2 Required)
J 34925 Pinion Setting Gage Kit. See Special Tools.
J 44416 Pinion Setting Adapter Kit (11. See Special Tools.5 inch axle)
J 8001 Dial Indicator Set
Adjustment
2008 Chevrolet Silverado 1500
2008 Driveline/Axle Rear Drive Axle - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
1. Lubricate the pinion bearings with axle lubricant. Refer to Fluid and Lubricant
Recommendations .
2. Install the pinion bearings into the axle housing.
Fig. 253: Assembling Special Tools In Axle Housing
Courtesy of GENERAL MOTORS CORP.
3. Assemble the following components into the axle housing:
IMPORTANT: Make sure all of the tools, the differential side bearing bores,
and the pinion bearing cups are clean before proceeding.
2008 Chevrolet Silverado 1500
2008 Driveline/Axle Rear Drive Axle - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
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