Chevrolet Silverado / GMC Sierra. Manual — part 1493

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