Modern-day vehicles use helical gears and synchromesh units within the gearboxes, that synchronize the rotation of gears that happen to be about to mesh. This removes clashing with the gears and makes gear shifting easier. Handbook gearboxes contain the regular purpose of the motive force all over the motion. https://gearbox28123.gynoblog.com/32980457/the-basic-principles-of-gearbox