It had been to start with released in 1939 for automobiles. It includes the fluid coupling and three planetary gears. They collectively make 3 forward and a person reverse pace. There is no clutch for engagement and disengagement within the engine. Most transmissions in modern day automobiles use synchromesh https://spencernopmg.anchor-blog.com/14101272/a-simple-key-for-gearbox-unveiled