In this type of gearbox, all the gears of the key shaft are in frequent mesh While using the corresponding gears with the countershaft (layshaft). As being the figure displays, two sliding Pet dog clutches are supplied on the leading shaft. You may check out a visual demonstration of handbook gear https://daltondnrro.thezenweb.com/indicators-on-automobile-gearbox-you-should-know-72169298