It had been initial released in 1939 for cars. It contains the fluid coupling and 3 planetary gears. They collectively make a few forward and a single reverse velocity. There isn't any clutch for engagement and disengagement from the engine. Torque converter does exactly the same operate the clutch https://manuelgtdmt.goabroadblog.com/32898613/how-much-you-need-to-expect-you-ll-pay-for-a-good-gearbox