Differential Case Service and Repair for F 150 2WD Pickup V8-54L SOHC VIN 3 (1999)
9. Using the special tool, measure ring gear backlash.
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If the backlash is within specification, go to Step 15. The specification shown in the illustration is the total allowable range.
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If a zero backlash condition occurs, go to Step 10.
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If the backlash is not within specification, go to Step 11.
10. If a zero backlash condition occurs, add a 0.50 mm (0.020 inch) shim to the RH side and subtract 0.50 min (0.020 inch) from the LH side to
allow backlash indication. Check backlash. Repeat Step 9.
11. To increase or decrease backlash, remove the bearing caps, and install a thicker shim and a thinner shim as shown.
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If backlash is not within specification, correct by increasing the thickness of one differential bearing shim and decreasing the thickness on the
other differential bearing shim by the same amount.
