In this sort of gearbox, many of the gears of the leading shaft are in continual mesh with the corresponding gears from the countershaft (layshaft). As the figure shows, two sliding Pet clutches are delivered on the leading shaft. A manual transmission needs the driver to manually choose the gears[6] by https://automobile-gearbox51738.activablog.com/33282120/a-secret-weapon-for-automobile-gearbox