Ford 2003 Mustang Workshop Manual page 2713

18. Remove the reversing lamp switch (15520).
19. Remove the reverse gear shift rail.
1. Rotate the reverse gear shift rail clockwise to disengage the ball stud from the reverse
gearshift lever.
2. Pull the reverse gear shift rail rearward slightly.
3. Rotate the reverse gear shift rail counterclockwise to align the ball stud with the slot in
the case and remove the reverse gear shift rail.
20. Remove the snap ring and the output shaft speed wheel (7H150).