Synchronizer Ring

Check if the clutch gear teeth are damaged or broken.

Fig 1: Checking Synchronizer Ring
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
Check internal surface for damage, wear and broken threads.
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: Checking Clearance Between Synchronizer Ring & Clutch Gear
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.