Honda Accord Worn Synchronizer

Honestly, I have to agree with the technicians. From what you are telling me, it seems that one or more of the synchros on your transmission may need to be replaced.

Before synchronizers were invented, if you drove a standard transmission, you had to rev the engine before shifting to the next gear so that you matched the engine speed and transmission as closely as possible.

Otherwise the gears would grind and you ran the risk of a stall.

Synchros, on the other hand, allowed each gear to spool up automatically so that the gearshift and engine speeds were matched fairly well and you could shift gears pretty effortlessly. There was no more worrying about double-clutching and the like. By double-clutching and revving, you manually took care of what the synchronizers do automatically.

Synchyros are essentially sleeves that automatically spin so that each gear spins at the proper speed so that the engine and gear synchronize automatically. This is what makes today’s transmissions such a pleasure to shift.