Ford 2003 Mustang Workshop Manual page 2442

Remove the bolts.
Remove the digital TR sensor.
5. Remove the manual control valve detent lever spring.
1. Remove the bolt.
2. Remove the manual control valve detent lever spring.
6. NOTE: Use a shop cloth to protect the transmission case surface.
Remove the manual lever shaft retaining pin.
7. Remove the nut and slide the manual control lever shaft out of the case.