In such a gearbox, all the gears of the key shaft are in continuous mesh with the corresponding gears in the countershaft (layshaft). Given that the determine reveals, two sliding Doggy clutches are provided on the main shaft. A manual transmission necessitates the driving force to manually decide on the gears[6] https://traviscfedy.ageeksblog.com/33026238/5-simple-statements-about-automobile-gearbox-explained