Ford 2003 Mustang Workshop Manual page 2732

NOTE: Align the slot in the synchronizer blocking ring with the tab on the first and second
synchronizer.
Install the first speed synchronizer blocking ring and the inner and outer cones as an assembly.
10. Install the first and second speed synchronizer hub ball.
11. NOTE: Align the notch in the first gear bearing spacer with the first and second speed
synchronizer ball.
Install the first gear bearing spacer and the first gear bearing.
12. NOTE: Align the slots on the synchronizer blocking ring with the slots on the first gear.
Install the first gear.