Manual Transmission

Synchro Sleeve and Hub Inspection and Reassembly

 13-37

Synchro Ring and Gear Inspection

  1. Inspect gear teeth on all synchro hubs and synchro sleeves for rounded off corners, which indicate wear.
  1. Install each synchro hub (A) in its mating synchro sleeve (B) and check for freedom of movement. Be sure to match the 3 sets of longer teeth (C) (120 degrees apart) on the synchro sleeve with the 3 sets of deeper grooves (D) in the synchro hub. Do not install the synchro sleeve with its longer teeth in the 1st/2nd synchro hub slots (E) because it will damage the spring ring.

NOTE: If replacement is required, always replace the synchro sleeve and synchro hub as a set.
  1. Inspect the inside of each synchro ring (A) for wear.M

Inspect the teeth (B) on each synchro ring for wear (rounded off).

Example of synchro ring teeth

  1. GOOD
  2. WORN
  1. Inspect the teeth (C) on each synchro sleeve and matching teeth on each gear for wear (rounded off).

Example of synchro sleeve teeth and gear teeth

  1. GOOD
  2. WORN