IIRC there is a such thing as a force overdrive u hit the button and u can lock overdrive in when u fill its necasary. The 350 motor i got did not come with a tranny so i am using my 4l80E can i put a tongue switch in the truck and flip it when the truck needs to hit overdrive. I beilve thats the only electronic thing on it other then torque converter. Which i beilve i can do that with the torque converter just didnt no about overdrive.