An automated transmission won't need any input from the driving force to vary forward gears less than regular driving circumstances. The sliding mesh gearboxes had been mostly used in the olden days. In this kind of gearbox the gears of principal shaft and lay shaft are usually not in mesh. https://automobile-gearbox63849.blogunteer.com/32728123/automobile-gearbox-things-to-know-before-you-buy