Ford 2003 Mustang Workshop Manual page 2716

28. Remove the pin.
29. Remove the reverse idler gear shaft (7140), the reverse idler gear and bushing (7141), and the
reverse gear overtravel stop (7E397).
30. Using the special tool, flatten the tabs on the countershaft rear bearing retainer (7195).
31. Remove the four bolts, the countershaft rear bearing retainer, and the shim (7L172).