Chevrolet Silverado / GMC Sierra. Service manual — part 1497

Fig. 300: 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 40.869 mm (1.609 in), select the 40.792 mm (1.606 in)
thrust block.

14. If the measurement obtained in step 11 is less than 40.488 mm (1.594 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 41.120 mm (1.622 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.

LOCKING DIFFERENTIAL ASSEMBLE (9.5 INCH AXLE)

IMPORTANT: The backlash must be rechecked and adjusted to

specification anytime the left and/or the right thrust washers
are replaced.

IMPORTANT: The left and right side gear backlash and thrust block thickness

measurement must be completed before the components of the
locking differential can be assembled.

2008 Chevrolet Silverado 1500

2008 Driveline/Axle Rear Drive Axle - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado

Fig. 301: View Of Left Side Gear Thrust Washer
Courtesy of GENERAL MOTORS CORP.

1. Install the left side gear thrust washer.

2008 Chevrolet Silverado 1500

2008 Driveline/Axle Rear Drive Axle - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado

Fig. 302: View Of Left Side Gear Cam Unit & Clutch Disc Assembly
Courtesy of GENERAL MOTORS CORP.

2. Install the left side gear cam unit and clutch disc assembly.

3. Install the right side gear thrust washer.

4. Install the right side clutch disc assembly.

5. Install the right side gear.

IMPORTANT: If the original pinion gears and thrust washers are being re-

used, install the pinion gears and thrust washers on the
same side as when removed.

2008 Chevrolet Silverado 1500

2008 Driveline/Axle Rear Drive Axle - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado