Most transmissions in modern day autos use synchromesh to synchronise the speeds of your enter and output shafts. Nevertheless, before the 1950s, most vehicles employed non-synchronous transmissions. It was 1st introduced in 1939 for vehicles. It includes the fluid coupling and three planetary gears. They collectively make 3 ahead https://danterzdhk.blogoxo.com/33954187/getting-my-gearbox-to-work