It was first introduced in 1939 for automobiles. It is made up of the fluid coupling and a few planetary gears. They collectively make 3 ahead and a single reverse velocity. There isn't any clutch for engagement and disengagement through the motor. Most transmissions in fashionable automobiles use synchromesh https://gearbox61582.targetblogs.com/34274858/the-smart-trick-of-gearbox-that-nobody-is-discussing