After searching and reading more I found the info below. Redesigned the controller again and deleted the previous posts so no one gets bad info.
Latest info:
White connector (10 pin connector) on the 4R70W harness mods – 1998 and up harnesses
•Brown/orange wire gets switched to ground for lockup of converter.
•Extend this wire and take it to a switch and then ground switch when closed.
•Orange/yellow and Violet/orange wires get connected together and combine them into 1 wire that goes to a switch. When the switch is closed it gets switched to ground to control overdrive.
•Solid red wire needs a 12 volt source because you’re using a different harness that wasn’t designed for this application. What I did was splice this wire into the solid orange wire on DTR sensor connector.
*Note the wiring for pre1998 harnesses is different as they have different pin outs.
Latest drawing: I think this one will actually work.
