Contemporary vehicles use helical gears and synchromesh gadgets within the gearboxes, that synchronize the rotation of gears which can be about to mesh. This eliminates clashing of the gears and tends to make equipment shifting simpler. Spur and helical gears are Employed in the sliding mesh gearbox to act. https://gearbox44196.blazingblog.com/33826245/the-basic-principles-of-gearbox