Most transmissions in modern vehicles use synchromesh to synchronise the speeds on the enter and output shafts. Having said that, before the 1950s, most vehicles employed non-synchronous transmissions. In uncomplicated phrases, two diverse gears are attached to enter and output shafts and will also be engaged with each other. https://gearbox08530.pages10.com/the-gearbox-diaries-69153060