Most transmissions in modern day autos use synchromesh to synchronise the speeds of the enter and output shafts. Nevertheless, ahead of the fifties, most cars used non-synchronous transmissions. In easy terms, two various gears are connected to enter and output shafts and can also be engaged with one another. https://holdendsbir.blogoxo.com/33958359/helping-the-others-realize-the-advantages-of-gearbox