Most transmissions in modern cars use synchromesh to synchronise the speeds of the enter and output shafts. Having said that, prior to the nineteen fifties, most autos applied non-synchronous transmissions. An automated transmission won't involve any enter from the motive force to vary ahead gears under usual driving conditions. https://knoxddaxx.digitollblog.com/33610729/helping-the-others-realize-the-advantages-of-gearbox