Ford 2003 Mustang Workshop Manual page 488

50. CAUTION: Overspreading may damage the differential housing.
NOTE: Tighten and loosen the Differential Carrier Spreader screw to normalize the Housing
Spreader Adapters prior to taking the final Dial Indicator reading.
Spread the differential housing to the specification.
1. Adjust the special tool to zero.
2. Tighten the screw until spreading the differential housing to the specification.
3. Remove the special tools.
51. NOTE: Select the correct size differential bearing shims by completing the differential bearing
shim selection chart.
NOTE: Apply a light coating of Premium Long-Life Grease XG-1-C, or equivalent meeting Ford
specification ESA-M1C75-B to the differential bearing shim to help hold in place.
Place the differential bearing shims in the differential housing.
52. Install the differential case.
1. Position the differential bearing cups on the differential bearings.
2. Lower the differential case in place between the differential bearing shims.