Ford 2003 Mustang Workshop Manual page 2862

21. Remove the reverse gear synchronizer snap ring.
22. Remove the reverse shift fork snap ring.
23. Remove the reverse shift fork, the reverse synchronizer and the thrust washer as an assembly.
24. Inspect the synchronizer for the following:
Check for worn, nicked or broken teeth. Install a new synchronizer as necessary.
Check keys for wear or distortion. Check the springs for distortion. Install a new
synchronizer as necessary.
25. Inspect the synchronizer blocking ring for the following:
Check for wear or damage. Install a new synchronizer blocking ring as necessary.
Check the clearance between the synchronizer blocking ring and the gear.
Position the blocking ring onto the gear. Make sure the correct blocking ring is
measured with the correct gear and that the blocking ring is fully seated on the
gear.
Insert a feeler gauge and measure the clearance, while applying pressure and
rotating the blocking ring. The measurement should be the same around the entire
circumference. If the clearance is less than 0.75 mm (0.030 in), install new