The driving force takes advantage of the gear lever to change or shift the gear. The lever moves in a certain way according to design and style. The Doggy clutch slides on the main shaft to rotate with it. All the gears over the countershaft are fastened with it. https://gearbox42075.bloggip.com/33859815/how-much-you-need-to-expect-you-ll-pay-for-a-good-gearbox