I can't find any ALDL file for van with turbo 400 and 1227747?

When you saw the TCC light come on that should be your Kickdown working. That is what the wiring diagram is showing and what the changes are in bin between 3 speed and 700R4. You can just edit that to change name. You do not have high gear because it's not 700R4 overdrive so it should never go high gear?