Most transmissions in present day cars and trucks use synchromesh to synchronise the speeds from the input and output shafts. Even so, ahead of the fifties, most cars and trucks made use of non-synchronous transmissions. Torque converter does precisely the same functionality which the clutch does within the handbook https://gearbox53185.blogsuperapp.com/34355624/an-unbiased-view-of-gearbox