Modern vehicles use helical gears and synchromesh units within the gearboxes, that synchronize the rotation of gears which are about to mesh. This eliminates clashing from the gears and helps make gear shifting much easier. Guide gearboxes include the constant purpose of the driving force all through the movement. https://spencerhugst.blog2news.com/34418142/the-2-minute-rule-for-gearbox