It had been 1st 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 within the engine. I’m Discovering Mech and considerably enjoy your information. https://gearbox08539.bloggerchest.com/33714147/gearbox-can-be-fun-for-anyone