Ford 2003 Mustang Workshop Manual page 2879

13. Inspect the output shaft for scoring or worn or damaged splines. Install a new output shaft as
necessary.
Assembly
1. Lubricate all components with the recommended transmission fluid when reassembling.
2. Using the special tools, press the output shaft front bearing on the output shaft.
3. Install the third gear bearing.
Apply petroleum jelly to the bearing.
4. Install third gear, the third gear synchronizer blocking ring and the third/fourth gear synchronizer
assembly. Position the output shaft with the output end facing upward. Using the special tool,
press the third/fourth gear synchronizer assembly into place.
Install the synchronizer body with the groove facing third gear.
Stop press operation before keys engage the blocking ring slots. Lift and rotate the third
gear and the blocking ring until the keys are seated in the blocking ring.