Output shaft: The gears to the output shaft meshes with the gears on lay shaft to obtain unique gear ratios. Higher gears provide much more speed as opposed to torque, that's perfect for easy  driving about the freeway.  This can be the traditional automatic gearbox that you'd probably have found https://miloeecyu.boyblogguide.com/33155820/5-simple-techniques-for-gearbox-auto