Ford 2003 Mustang Workshop Manual page 475

Rotate the special tool several half turns to seat the pinion bearings. Position the special tool as
shown.
6. Install the special tool.
1. Position the special tool on the differential housing differential bearing seat.
2. Install the differential bearing caps.
3. Install the bolts.
7. Use a drive pinion bearing adjustment shim as a gauge for shim selection. Check the drive
pinion bearing adjustment shim thickness between the Gauge Block and the Gauge Tube. A
slight drag indicates correct shim selection.
8. Remove all of the special tools.
9. CAUTION: Use the same pinion bearings and drive pinion bearing adjustment shim
from the drive pinion bearing adjustment shim selection procedure for final assembly.
Position the drive pinion bearing adjustment shim and the pinion bearing on the drive pinion
gear stem.
10. Using the special tools and a suitable press, firmly seat the drive pinion bearing adjustment
shim and pinion bearing on the drive pinion gear stem.