These used synchronizers to match equipment speeds, enabling for smoother shifts and easier driving. The mid-twentieth century saw the introduction of automated transmissions.  Epicyclic geartrains are obtaining immensely well known nowadays since they are being used in almost every new car getting automated transmissions. Good examples would be Audi A8, https://automobile-gearbox17383.slypage.com/34725674/the-greatest-guide-to-automobile-gearbox