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1. Install the drive pinion, if necessary. Refer to Drive Pinion and Ring Gear Replacement (8.6, 9.5/9.5LD, and 11.5 Inch Axles) or Drive Pinion and Ring Gear Replacement 2. Measure the rotating torque of the drive pinion using an inch-pound torque wrench. Record the measurement. Specification: The rotating torque for the drive pinion bearings should be 1.7-3.4 N.m (15- 3. If the rotating torque for the drive pinion bearings is not within specifications, adjust as necessary. Refer to Drive Pinion and Ring Gear Replacement (8.6, 9.5/9.5LD, and 11.5 4. Install the differential assembly with the differential side bearings and bearing cups into the axle housing. 5. Insert one BENT 1.016 mm (0.040 in) thick service shim into the right side axle housing. Side the differential assembly towards the bent service shim in order to hold the shim in 6. While holding the differential assembly against the bent service shim, install one 4.318 mm (0.170 in) thick service spacer into the left side axle housing. 7. Move the differential assembly to the right until the ring gear contacts the drive pinion. Once the ring gear contacts the drive pinion, continue to move the ring gear towards the 8. While holding the ring gear against the drive pinion, insert progressively larger service In order to maintain the original backlash, adjust the Measure the service shims and the service spacers one at a Do not use or reuse the original cast iron production shims. IMPORTANT: Before installation of the case assembly, ensure that the side bearing surfaces in the axle housing are clean and free of
2008 Chevrolet Silverado 1500 2008 Driveline/Axle Rear Drive Axle - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
shims between the service spacer and the differential side bearing cup until a moderate 9. Once the largest service shim has been determined, measure the thickness of the shim using a micrometer. Measure the service shim in 3 locations. Calculate the average of the 3 10. Install the service shim that was just measured back into the left side of the axle housing. The service shim must be installed between the service spacer and the differential side 11. Remove the BENT shim from the right side of the axle housing. 12. Insert one 4.318 mm (0.170 in) thick service spacer into the right side axle housing. 13. Move the differential assembly towards the left side of the axle housing. While holding the differential assembly against the left side shim pack, insert progressively larger service shims 14. Once the largest service shim has been determined, measure the thickness of the shim using a micrometer. Verify the thickness of the service shim. Measure the service shim in 3 15. In order to preload the differential side bearing and set the initial backlash to approximately 0.127 mm (0.005 in), adjust the thickness of left and right side shims by doing the following: 1. Subtract 0.152 mm (0.006 in) from the measurement recorded for the left side shim in step 9. Record the measurement. 2. Add 0.356 mm (0.014 in) to the measurement recorded for the right side shim in step 14. 16. Select the correct service shim thickness for each side corresponding to the measurements determined above. Using a micrometer, verify the thickness of the service shim. Measure the 17. Install the left side service shim into the axle housing. The service shim must be installed between the service spacer and the differential side bearing cup. 18. Move the differential assembly towards the left side of the axle housing. 19. Install the right side service shim into the axle housing using the J 25588 , if necessary. See Special Tools. The service shim must be installed between the service spacer and the NOTE: Refer to Fastener Notice .
2008 Chevrolet Silverado 1500 2008 Driveline/Axle Rear Drive Axle - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
20. Install the differential bearing caps and bolts. Tighten: Tighten the differential bearing cap bolts to 75 N.m (55 lb ft). 21. Rotate the pinion several times to ensure the bearings have seated. 22. Measure the rotating torque of drive pinion and differential case side bearings using an inch- pound torque wrench. Specification: 0.57-1.13 N.m (5-10 lb in) greater than the rotating torque of the drive 23. Calculate the differential side bearing preload by subtracting the drive pinion preload, measured in Step 2, from the drive pinion and the differential case bearing preload, Specification: The differential side bearing preload should be 1.7-4.0 N.m (15-35 lb in). 24. If the differential side bearing preload is not within specifications, add or subtract shim thickness equally from each shim pack as necessary in order to increase/decrease the side 25. Once the differential side bearing preload is within specifications, measure the backlash between the ring gear and the drive pinion and adjust, if necessary. Refer to Backlash 26. Once backlash and differential side bearing preload is within specifications, perform a gear tooth contact pattern check in order to ensure proper alignment between the ring and pinion DIFFERENTIAL CARRIER BEARING PRELOAD ADJUSTMENT (9.5, AND 9.5LD INCH AXLES Tools Required J 22779 Side Bearing Backlash Gage. See Special Tools. J 24429 Side Bearing Backlash Spanner. See Special Tools. Adjustment IMPORTANT: Ensure that the side bearing surfaces in the axle housing are
2008 Chevrolet Silverado 1500 2008 Driveline/Axle Rear Drive Axle - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
1. Remove the differential assembly, if necessary. 2. Measure the rotating torque of the drive pinion bearing using an inch-pound torque wrench. Specification: The rotating torque of the drive pinion should be 1.7-3.4 N.m (15-30 lb in) 3. If the rotating torque of the drive pinion is less than 1.7 N.m (15 lb in) for new bearings or 1.1 N.m (10 lb in) for used bearings, tighten the pinion in small increments until the 4. If the rotating torque of the drive pinion is greater than 3.4 N.m (30 lb in) for new bearings or 2.3 N.m (20 lb in) for used bearings, remove the drive pinion and replace the collapsible 5. Install the differential assembly, if necessary. 6. Support the differential assembly in order to prevent the differential assembly from falling out of the axle housing. 7. Slide the differential case assembly towards the right side axle housing until the ring gear contacts the drive pinion. This is the ZERO backlash point. reused, the original bearing cups must also be used. The drive pinion bearing preload must be within The differential side bearings must be initially preloaded in CAUTION: To prevent personal injury and/or component damage, support the differential case when removing the case IMPORTANT: Do not force the ring gear into contact with the drive pinion.
2008 Chevrolet Silverado 1500 2008 Driveline/Axle Rear Drive Axle - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
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