These applied synchronizers to match gear speeds, allowing for smoother shifts and easier driving. The mid-twentieth century noticed the introduction of computerized transmissions.  Most transmissions in modern-day automobiles use synchromesh to synchronise the speeds from the enter and output shafts. However, previous to the fifties, most vehicles employed non-synchronous transmissions. https://automobilegearbox52838.boyblogguide.com/33155550/the-best-side-of-automobile-gearbox