In this type of gearbox, the many gears of the main shaft are in frequent mesh Together with the corresponding gears on the countershaft (layshaft). Since the determine displays, two sliding dog clutches are delivered on the primary shaft. Computerized gearboxes appeared commercially in the forties, according to the International Journal https://automobile-gearbox97294.techionblog.com/34174683/everything-about-automobile-gearbox