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Fig. 266: Measuring Ring Gear Backlash 5. Install the J 25025-1 and the J 8001 to the axle housing as shown. See Special Tools. 6. Place the indicator stem of the J 8001-3 at the heel end of a gear tooth. See Special Tools. 7. Set the J 8001-3 so that the stem is aligned with the gear rotation and perpendicular to the tooth angle. See Special Tools. 8. Preload the dial of the J 8001-3 . See Special Tools. Align the needle and the dial face of the J 8001-3 to ZERO. See Special Tools. 9. While holding the drive pinion stationary, move the ring gear back and forth. Measure and record the backlash. 10. Repeat the measuring procedure at eight points around the ring gear.
2008 Chevrolet Silverado 1500 2008 Driveline/Axle Rear Drive Axle - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
Specification: The difference between the backlash at all of the measuring points should 11. If the difference between the backlash at all of the measuring points varies by more than 0.05 mm (0.002 in), inspect for the following conditions: Burrs A distorted case flange Uneven bolting 12. If the difference between all the measuring points is within specifications, the backlash at the minimum lash point measured should be: Specification: The backlash between the ring gear and the drive pinion should be between
2008 Chevrolet Silverado 1500 2008 Driveline/Axle Rear Drive Axle - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
Fig. 267: Turning Adjusters Using J 24429 13. If the backlash is not within specifications, adjust the backlash by performing the following steps: 1. Remove the differential bearing adjuster nut retainers bolts. 2. Remove the differential bearing adjuster nut retainers. 3. Remove the bearing cap bolts. 4. Remove the bearing caps. Mark the bearing caps left and right. 5. If the backlash is too small, increase the backlash by turning the left differential bearing adjuster in one slot and the right differential bearing adjuster out one slot using 6. If the backlash is too large, decrease the backlash by turning the right differential bearing adjuster in one slot and the left differential bearing adjuster out one slot using 14. Install the bearing caps. 15. Install the bearing cap bolts. Tighten: Tighten the bearing cap bolts to 185 N.m (136 lb ft) (10.5 inch axle). Tighten the bearing cap bolts to 207 N.m (153 lb ft) (11.5 inch axle). 16. Recheck the backlash following the steps above to verify that the backlash is within specifications. 17. Install the differential bearing adjuster nut retainers. 18. Install the differential bearing adjuster nut retainer bolts. Tighten: Tighten the differential bearing adjuster nut retainer nut bolts to 27 N.m (20 lb ft). 19. Measure the drive pinion and differential case side bearing preload and adjust, if necessary following the steps above. 20. Once the backlash and bearing preload is correct, perform a gear tooth contact pattern check in order to ensure proper alignment between the ring and pinion gears. Refer to Gear NOTE: Refer to Fastener Notice .
2008 Chevrolet Silverado 1500 2008 Driveline/Axle Rear Drive Axle - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
BACKLASH ADJUSTMENT (9.5 LD AXLE) Special Tools J 8001 Dial Indicator Set J 24429 Side Bearing Backlash Spanner. See Special Tools. J 25025 Guide Pins. See Special Tools. Adjustment Fig. 268: Measuring Pinion Rotating Torque IMPORTANT: Ensure that the side bearing surfaces in the axle housing are The differential side bearings must be initially preloaded in
2008 Chevrolet Silverado 1500 2008 Driveline/Axle Rear Drive Axle - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
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