It absolutely was initially launched in 1939 for automobiles. It consists of the fluid coupling and a few planetary gears. They collectively make 3 forward and one reverse velocity. There is not any clutch for engagement and disengagement through the engine. Bevel gearboxes have spiral and straight enamel designs. https://gearbox31963.loginblogin.com/41106344/the-best-side-of-gearbox