Present day cars and trucks use helical gears and synchromesh equipment during the gearboxes, that synchronize the rotation of gears that are about to mesh. This eliminates clashing on the gears and tends to make equipment shifting much easier. Spur and helical gears are used in the sliding mesh https://marcottspo.bloguetechno.com/the-2-minute-rule-for-gearbox-68911708