Most transmissions in fashionable cars use synchromesh to synchronise the speeds of the input and output shafts. Even so, ahead of the 1950s, most vehicles used non-synchronous transmissions. In simple terms, two various gears are attached to enter and output shafts and may also be engaged with one another. https://sergiovuuur.spintheblog.com/34188947/how-gearbox-can-save-you-time-stress-and-money