These utilized synchronizers to match gear speeds, enabling for smoother shifts and less complicated driving. The mid-20th century observed the introduction of computerized transmissions.  Most transmissions in fashionable vehicles use synchromesh to synchronise the speeds of your input and output shafts. However, before the fifties, most cars applied non-synchronous transmissions. https://automobile-gearbox52738.rimmablog.com/33277872/automobile-gearbox-things-to-know-before-you-buy