Ford 2003 Mustang Workshop Manual page 2752

35. CAUTION: Install the thickest shim closest to the front bearing cup to provide
support for the cup.
CAUTION: Although zero end play is the ideal, end play up to mm (0.002 in) is an
acceptable tolerance. Do not overload the bearings with a shim that is too thick as
damage may occur.
NOTE: Select a shim with a thickness equal to the dial indicator reading. This will provide zero
end play.
Rotate the transmission to the horizontal position and remove the input shaft bearing retainer.
Remove the bearing race and install the necessary shim(s).
36. CAUTION: Do not cover the notch in the input shaft bearing retainer with sealer.
Apply a 3.2-mm (1/8-inch) bead of silicone rubber to the sealing surface on the input shaft
bearing retainer.
37. Install the input shaft bearing retainer and the four bolts.