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Chevrolet Silverado / GMC Sierra. Manual - part 1493
Fig. 289: View Of Left Side Gear Cam Unit & Clutch Disc Assembly
Courtesy of GENERAL MOTORS CORP.
2. Install the locking differential side gear cam unit and clutch disc assembly into the left side
or flange-end of the differential case.
3. Install the differential side gear shim into the right side or bell-end of the differential case.
4. Install the locking differential side gear and clutch disc assembly into the right side or bell-
end of the differential case.
5. Install the pinion shaft.
6. Install the pinion shaft bolt.
Tighten: Tighten the pinion shaft bolt finger tight.
2008 Chevrolet Silverado 1500
2008 Driveline/Axle Rear Drive Axle - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
Fig. 290: Installing Brass Drift Between Locking Differential Side Gear & Pinion
Shaft
Courtesy of GENERAL MOTORS CORP.
7. Install a brass drift between the left locking differential side gear cam unit and the pinion
shaft.
Press the brass drift in far enough in order to compress the clutch disc assembly and hold the
left side gear assembly in place.
8. Install a brass drift between the right side locking differential side gear and the pinion shaft.
Press the brass drift in far enough in order to hold the right side gear assembly in place.
2008 Chevrolet Silverado 1500
2008 Driveline/Axle Rear Drive Axle - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
Fig. 291: Measuring Distance Between Side Gear Faces
Courtesy of GENERAL MOTORS CORP.
9. Measure the distance between the side gear faces using a 25.4-50.8 mm (1-2 in) telescoping
gage.
10. Remove the telescoping gage.
11. Measure the telescoping gage with a micrometer.
Record the measurement.
IMPORTANT: Do not measure the distance between the side gear teeth.
2008 Chevrolet Silverado 1500
2008 Driveline/Axle Rear Drive Axle - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
12. Compare the measurement obtained in step 11 to the thrust block sizes available. If the
measurement is equal to one of the thrust blocks sizes available, then select that thrust block.
13. If the measurement obtained in step 11 is not equal to one of the thrust blocks sizes
available, then select the thrust block that is smaller than the measurement.
For example, if the measurement is 33.833 mm (1.332 in), select the 33.782 mm (1.330 in)
thrust block.
14. If the measurement obtained in step 11 is less than 33.578 mm (1.322 in), then reduce the
left side gear thrust washer or the right side gear shim thickness in order to increase the
thrust block opening.
15. If the measurement obtained in step 11 is greater than 34.290 mm (1.350 in), then increase
the left side gear thrust washer or the right side gear shim thickness in order to decrease the
thrust block opening.
16. Recheck the left and/or right side gear backlash and adjust as necessary.
17. Recheck the thrust block clearance and adjust as necessary.
18. Assemble the differential. Refer to Locking Differential Assemble (9.5 Inch Axle).
LOCKING DIFFERENTIAL ADJUSTMENT (9.5 INCH AXLE)
Tools Required
J 7872 Magnetic Base Dial Indicator. See Special Tools.
J 8001 Dial Indicator Set
Adjustment of the Differential
When adjusting the differential, note the following:
IMPORTANT: The backlash must be rechecked and adjusted to
specification anytime the left and/or the right thrust washers
are replaced.
IMPORTANT: If it is necessary to replace the left side gear cam unit and disc
assembly, the right side gear and disc assembly, or the thrust
block, the entire differential must be adjusted. The differential is
adjusted using selective thickness thrust washers between the
clutch disc assemblies and the case and/or different selective
thickness thrust blocks.
2008 Chevrolet Silverado 1500
2008 Driveline/Axle Rear Drive Axle - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
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