It had been to start with introduced in 1939 for vehicles. It is made of the fluid coupling and a few planetary gears. They collectively make 3 forward and a person reverse speed. There is not any clutch for engagement and disengagement through the engine. Torque converter does exactly https://gearbox91109.ttblogs.com/13451527/how-much-you-need-to-expect-you-ll-pay-for-a-good-gearbox