It had been 1st launched in 1939 for automobiles. It includes the fluid coupling and three planetary gears. They collectively make a few forward and 1 reverse velocity. There is not any clutch for engagement and disengagement from the engine. The copyright which unites many of the planetary gears https://kylercrcnx.wizzardsblog.com/33742087/5-tips-about-gearbox-you-can-use-today