1. Measure the thickness of the shift fork fingers.
   - If the thickness is not within the standard, replace the shift fork.
   - If the thickness is within the standard, replace the synchro sleeve.
   - If one arm of the shift fork shows more wear than others, the fork may be bent and needs to be replaced.
   Standard:

   1st/2nd, 3rd/4th, 5th/6th: | 7.4−7.6 mm (0.29−0.30 in.)
   Reverse: | 6.2−6.4 mm (0.24−0.25 in.)