It had been 1st released in 1939 for automobiles. It contains the fluid coupling and three planetary gears. They collectively make a few ahead and 1 reverse speed. There isn't a clutch for engagement and disengagement with the motor. Most transmissions in modern day autos use synchromesh to synchronise https://gearbox97529.blogchaat.com/33859258/what-does-gearbox-mean