Ford 2003 Mustang Workshop Manual page 483

34. CAUTION: Do not damage the aluminum differential housing while carrying out
these procedures.
Place the differential case with the special tools in the differential housing.
35. Position the special tool on the outside mounting hole.
36. NOTE: Repeat this step until obtaining a consistent reading.
Measure the total end play.
1. Attach the special tool and position the indicator tip on the machined surface of the
differential case flange.
2. Move the differential case to the left and the right (as far as possible).
3. Record the reading on the differential bearing shim selection procedure line A.
Differential Bearing Shim Selection Chart
Line-A End play without ring gear
Line-B End play with ring gear (ring gear side)
Line-C Subtract Line-B from Line-A, also record on Line C, below
8.8-inch Aluminum Axle Example Actual
0.498
-0.245 Minus (-)
0.253