Synchronizer Ring

WARNING: This page is about a different car, the 2004 Mitsubishi Eclipse. However, it is still accessible from the selected car via links, so may be relevant.

Check the clutch gear teeth for damage and broken.
Check internal surface for damage, wear and broken threads.

Fig 1: Inspecting Synchronizer Ring
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
Force the synchronizer ring toward the clutch gear and check clearance "A". If "A" is less than the limit, replace.
Minimum limit: 0.5 mm (0.020 inch)

Fig 2: Checking Clearance
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.