Contemporary cars and trucks use helical gears and synchromesh devices within the gearboxes, that synchronize the rotation of gears which are about to mesh. This removes clashing in the gears and will make equipment shifting less difficult. The output through the engine is distributed for the gearbox using a clutch https://simonjsvwv.oblogation.com/33318702/5-simple-techniques-for-automobile-gearbox