Most transmissions in fashionable cars and trucks use synchromesh to synchronise the speeds with the enter and output shafts. On the other hand, previous to the nineteen fifties, most cars and trucks utilised non-synchronous transmissions. Torque converter does a similar function that the clutch does during the manual gearbox https://jeffreyobjtd.ampedpages.com/not-known-factual-statements-about-gearbox-60774667