Synchronizer Ring

1. Check the clutch gear teeth for damage and broken.
2. Check internal surface for damage, wear and broken threads.
   Fig 1: Locating Clutch Gear Teeth

   Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
3. Force the synchronizer ring toward the clutch gear and check clearance "A." If "A" is less than the limit, replace the synchronizer ring.

Minimum limit: 0.5 mm (0.020 inch) 

Fig 2: Identifying Clearance A

Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.