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Fig. 218: Removing Left Side Differential Bearing Adjuster 32. Turn the left side differential adjuster nut clockwise using the J 36615 in order to preload the differential side bearings against the differential side bearing cups. See Special Tools. Tighten: Tighten the differential adjuster nut to 75 N.m (55 lb ft). 33. Rotate the pinion several times in order to seat the pinion and differential side bearings. 34. Measure the rotating torque of the drive pinion and differential assembly using an inch- pound torque wrench.
2008 Chevrolet Silverado 1500 2008 Driveline/Axle Front Drive Axle - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
Specification: The rotating torque of the pinion and differential assembly should be 3.4-6.2 Fig. 219: Alignment Mark Between Differential Adjuster Nut Sleeve & Differential 35. If the rotating torque measurement is below 2.8 N.m (25 lb in) for used bearings, or 3.4 N.m (30 lb in) for new bearings, adjust the differential side bearing preload using the following 1. Place an alignment mark between the differential adjuster nut sleeve and the differential carrier case, left and right sides. 2. Using the J 36599-A or the J 36615 , turn the left and the right side differential adjuster nut sleeves in or clockwise one notch. See Special Tools. 3. Measure the rotating torque of the pinion and differential assembly using an inch-
2008 Chevrolet Silverado 1500 2008 Driveline/Axle Front Drive Axle - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
pound torque wrench. 4. Compare the new measurement to the specification listed in step 34. If the rotating torque of the pinion and differential assembly is not within specifications, continue to 36. If the rotating torque measurement is above 5.1 N.m (45 lb in) for used bearings, or 6.2 N.m (55 lb in) for new bearings, adjust the differential side bearing preload using the following 1. Place an alignment mark between the differential adjuster nut sleeve and the differential carrier case, left and right sides. 2. Using the J 36599-A or the J 36615 , turn the left and the right side differential adjuster nut sleeves out or counterclockwise one notch. See Special Tools. 3. Measure the rotating torque of the pinion and differential assembly using an inch- pound torque wrench. 4. Compare the new measurement to the specification listed in step 34. If the rotating torque of the pinion and differential assembly is not within specifications, continue to 37. Once the specified rotating torque is obtained, rotate the pinion several times to ensure the bearings have seated. Recheck the rotating torque and adjust if necessary. 38. Measure the drive pinion to ring gear backlash and adjust, if necessary. Refer to Backlash Inspection and Adjustment. 39. Once the bearing preload and drive pinion to ring gear backlash is within specifications, perform a gear tooth contact pattern check to ensure proper contact between the pinion and 40. Complete the assembly of the differential carrier. Refer to Differential Carrier Assembly Final Assembly (8.25 F4WD Axle) or Differential Carrier Assembly Final Assembly BACKLASH INSPECTION AND ADJUSTMENT Tools Required
2008 Chevrolet Silverado 1500 2008 Driveline/Axle Front Drive Axle - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
J 8001 Dial Indicator Set J 36599-A Side Bearing Nut Wrench. See Special Tools. J 36615 Side Bearing Nut Wrench. See Special Tools. Inspection and Adjustment 1. Remove all alignment marks made previously and re-mark the location of the differential adjuster nut sleeves in relation to the differential carrier assembly case halves. Ensure that the notches can be counted when turned.
2008 Chevrolet Silverado 1500 2008 Driveline/Axle Front Drive Axle - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
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