F 250 4WD HD Pickup V8-460 7.5L VIN G EFI (1997)
6. An individual gear set need not conform exactly to the ideal pattern to be acceptable. Any combination of drive and coast patterns shown is
acceptable.
NOTE: When making pinion position changes, drive pinion shims should be changed in the range of 0.05 mm (0.002 inch) to 0.10 mm (0.004
inch) until correct pattern has been obtained.
7. Since each gear set rolls a characteristic pattern, the patterns shown are considered acceptable and should be used as a guide. The drive pattern is
rolled on the convex side of the tooth, and the coast pattern is rolled on the concave side.
8. The movement of tooth contact patterns with changes in shimming can be summarized as follows:
a. Thinner drive pinion shim, with the backlash set to specification, moves the pinion farther from the ring gear.
b. Thicker drive pinion shim, with the backlash set to specification, moves the pinion closer to the ring gear.
9. If the drive pinion shims are correct, 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. Increasing backlash moves the ring gear
away from the pinion. Drive pattern moves slightly higher and toward the heel. Coast pattern moves higher and towards the heel.
NOTE: If the patterns are not correct, make the change as indicated. The differential case and drive pinion will have to be removed from the
carrier housing to change a drive pinion shim.
10. Check ring gear backlash by installing a dial indicator on the carrier housing. Check ring gear and pinion backlash at three equally spaced points
