Hey guys I’ve got a 85 T/A that was originally a 305 carb car. I’ve swapped in a 350 but am keeping the original 700r4. I have found out it has type 4 internal wiring.




I know pin A gets 12v from the brake switch. I will also need a vacuum switch. Pin D is the ground from the ECM. My question is what is pin B for and how should I hook this up without using the computer.