Synchronizer Hub: Testing and Inspection

1. Inspect the synchro ring and gear.
A: Inspect the inside of the synchro ring for wear.





B: Inspect the synchro sleeve teeth and matching teeth on the synchro ring for wear (rounded off).





C: Inspect the synchro sleeve teeth and matching teeth on the gear for wear (rounded off).
D: Inspect the gear hub thrust surface for wear.
E: Inspect the cone surface for wear and roughness.
F: Inspect the teeth on all gears for uneven wear, scoring, galling, and cracks.





G: Install each synchro hub in its mating synchro sleeve, and check for freedom of movement.

NOTE: If replacement is required, always replace the synchro sleeve and synchro hub as a set.