The driving force uses the gear lever to change or shift the gear. The lever moves in a certain way according to design. It was initial launched in 1939 for automobiles. It contains the fluid coupling and three planetary gears. They collectively make 3 ahead and one particular reverse https://gearbox30516.myparisblog.com/34345445/how-much-you-need-to-expect-you-ll-pay-for-a-good-gearbox