The '85 CA models do have a computer. It monitors engine/tranny parameters and emmissions. The EGR is controlled by throttle position and tempurature.

They are right about the TCC, But it is also controlled internally by the tranny's speed governor on the hydraulic circuit. They work well if the electrics are bypassed, including the brake circuit, and you install a manual switch to control it. When engaged, it will lock with 10% throttle input and stay locked until you disengage it or you slow to the minimum lock up speed, which will be between 30 and 35. The speed is controlled by the tranny governor. Mine has worked this way for over 500K without a rebuild on a 700r4. I attribute the long tranny life to more lockup time, which translates to less heat.

I have a good wiring diagram scanned for the '85. If you don't have one, get one. You will need it at some time during your project. If you would like me to send it to you, drop me a line to dmaxmaverick@yahoo.com

Your project sounds like a lot of fun. Welcome aboard!