One of the guide transmissions could be the Wilson pre-selector, released in 1930 applied to be a planetary gear method to preselect equipment ratios by running a small lever about the steering part.  The motor is linked to the transmission from the torque converter, which transfers electricity into the gears https://gearboxauto75308.blogolize.com/new-step-by-step-map-for-gearbox-auto-72854645