Ford 2003 Mustang Workshop Manual page 2507

11. Remove the reverse clutch piston spring retaining ring.
12. Remove the reverse clutch piston spring pressure ring.
1. Remove the reverse clutch piston spring.
2. Remove the reverse clutch piston spring pressure ring.
13. NOTE: To ease reverse clutch piston removal, it may be necessary to apply air pressure to the
reverse clutch drum. Block the opposite hole.
Remove the reverse clutch piston.