Synchronizer Rings

Do not interchange them. When reusing synchronizer rings, always install on the same gear wheel.
Check for wear and replace if necessary.
Check the grooves -arrow 1- on the synchronizer ring -A- and the inner race for flat areas (grooves are worn).

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The coating on the synchronizer rings must not be damaged.
If an intermediate ring -B- is installed, check the outer friction surface -arrow 2- and the inner friction surface -arrow 3- for >>grooves<< and >>scoring<<.
Check taper of drive gear for >>grooves<< and >>scoring<<.
Coat the synchronizing with transmission fluid and then install.