35 REAR AXLE Caution: Gear teeth may have sharp edges. Paint right gear teeth with a marking compound on both the drive and coast side. Rotate ring one complete revolution in both direction while applying load with a large screwdriver between the carrier casting and differential case flange. Refer Fig. 71 A. Normal or desirable pattern. The drive pattern should be centered on the tooth.The coast pattern should also be centered on the tooth, but may be slightly toward the toe. There should be some clearance between the pattern and the top of the tooth. B. Backlash correct. Thinner pinion position shim required. C. Backlash correct. Thicker pinion position shim required. D. Pinion posi t ion shim correct Decrease backlash. E. Pinion posi t ion shim correct. Increase backlash. Pattern movements summary l Decreasing backlash moves the ring gear closer to the pinion. Drive pattern (convex side of gear) moves slightly lower and toward the toe. Coast pattern (concave side of gear) moves lower and toward the toe. l Increasing backlash moves the ring gear away from the pinion. Drive pattern moves slightly higher and toward the heel. Coast pattern moves higher and toward the heel. l Thicker pinion position shim with the backlash constant moves the pinion closer to the ring gear. Drive pattern moves deeper on the tooth and slightly toward the toe. Fig. 71 Coast pattern moves deeper on the tooth and slightly toward the heel. l Thinner pinion position shim with the backlash constant moves the pinion farther from the ring gear. Drive pattern moves toward the top of the tooth (face contact) and toward the heel. Coast pattern moves toward the top of the tooth and slightly toward the toe.
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