Simple automatic/dynamic gearbox

Simple automatic/dynamic gearbox with 2 gear ratio options 4:1-1:1 and 2:1-1:2 To switch between two just sets corresponding differential slip to 5 and other to 0, red for low gear ratio (4:1-1:1) or blue for high gear ratio (2:1-1:2). Low gear ration is set as default !!! After switching, you need to change direction of motor because two gear ratio work in the opposite way !!! Input and output are marked on gearbox Its 8x5x8 To be honest I don't really know how it works xd Its just one of the designs I use in Lego that I found on YouTube :v Technically it should have ∞: 1 ratio for both low and high but after respectively 4:1 and 2:1 it just suck up too much torque for it to be useful :/