Ford 2003 Mustang Workshop Manual page 2860

13. Remove and discard the OSS sensor tone wheel lower retaining ring.
14. Remove and discard the rear mainshaft roller bearing snap ring.
15. Remove the upper spacer, the rear mainshaft roller bearing and the lower spacer.
Inspect the rear mainshaft roller bearing for wear or damage. Install a new bearing as
necessary.
16. Remove and discard the reverse gear snap ring.