Modern-day cars and trucks use helical gears and synchromesh devices during the gearboxes, that synchronize the rotation of gears which have been about to mesh. This gets rid of clashing of your gears and would make gear shifting a lot easier. Samples of such transmissions are used in helicopters https://marioutuur.elbloglibre.com/33764461/indicators-on-gearbox-you-should-know