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The effects of bearing preloads are not readily apparent on hand-loaded tooth contact pattern Pinion Depth Adjustment Adjust the position of the pinion by increasing or decreasing the distance between the pinion head Backlash Adjustment Adjust the backlash by means of moving the side bearing adjuster sleeves which move the case If the left side adjuster sleeve is moved in, along with an equal outward movement of the If the left side adjuster sleeve is moved out, along with an equal inward movement of the Testing Procedure 1. Wipe clean the differential case, the ring gear and the differential carrier housing of lubricant. Carefully clean each tooth of the ring gear.
2008 Chevrolet Silverado 1500 2008 Driveline/Axle Front Drive Axle - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
Fig. 240: Ring Gear Teeth Pattern 2. Use a medium stiff brush in order to sparingly apply gear marking compound GM P/N 1052351 (Canadian P/N 10953497) or equivalent to all of the ring gear teeth. 3. Using a wrench, turn the drive pinion flange/yoke so that the ring gear rotates at least 3 full revolutions. 4. Turn the drive pinion flange/yoke in the opposite direction so that the ring gear rotates at least 3 full revolutions in the opposite direction. 5. Observe the pattern on the ring gear teeth. Compare the pattern with the following illustrations. 6. Once the proper pattern is obtained, continue the assembly of differential carrier. Refer to IMPORTANT: Avoid turning the ring gear excessively.
2008 Chevrolet Silverado 1500 2008 Driveline/Axle Front Drive Axle - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
Differential Carrier Assembly Assemble (8.25 Inch Axle Lock Ring Style) or Correct Contact Pattern Condition Fig. 241: Identifying Correct Gear Tooth Contact Pattern The backlash and pinion depth is correct. Correction None required. Service Hints Loose bearing on the drive pinion or in the differential case may cause patterns that vary. If the Total assembly Differential case Drive pinion
2008 Chevrolet Silverado 1500 2008 Driveline/Axle Front Drive Axle - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
If these settings are correct, inspect for damage or incorrectly assembled parts. Drive Side Heel - Coast Side Toe Contact Pattern Fig. 242: Identifying Drive Side Heel - Coast Side Toe Contact Pattern Condition The pinion depth is incorrect. The drive pinion is too far away from the ring gear. Correction Adjust the pinion depth of drive pinion. Refer to Pinion Depth Adjustment. Drive Side Toe - Coast Side Heel Contact Pattern
2008 Chevrolet Silverado 1500 2008 Driveline/Axle Front Drive Axle - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
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