Ford 2003 Mustang Workshop Manual page 486

42. NOTE: The bolts retaining the differential ring gear to the differential case may interfere while
carrying out this procedure. If so, remove three to five bolts to provide clearance.
Measure the end play.
1. Attach the special tool and position the indicator tip on the machined surface of the
differential case flange.
2. Rock the differential ring gear to allow full mesh with the drive pinion gear.
3. With the gears in full mesh, set the special tool to zero.
4. Move the differential case as far as possible to the left and note the reading.
5. Record the reading on the differential bearing shim selection procedure line B.
Remove the special tool.
43. Remove the differential case from the differential housing.
44. Remove the bolts. Apply Stud and Bearing Mount EOAZ-19554-BA or equivalent meeting Ford
specification WSK-M2G349-A1 to the bolt threads, and reinstall the bolts.
45. NOTE: Measure the stand height of both differential bearings prior to installation.
NOTE: Mark the differential bearings left and right before measuring them.
Install the special tool.