I am new to this forum. I have installed a 4BT into a 97 H1 Hummer with the existing 4L80E tranny. I have installed a TPS sensor on the rotary pump, removed the electronic throttle pedal and installed a manual one, installed a crank position sensor and a grooved balancer pulley off of a 6BT. I was told that I could run the existing computer controlled transmission without an aftermarket controller if I wired these components into the system. Problem is I don't know for sure what imputs the computer needs from the engine to operate the tranny, or how to wire them. Has anyone done this, or attempted to do this? Thanks, Ron