I used an earlier lock up from a late 80's diplomat with a 1 wire button activated OD & lower 1st & 2nd gears. These were also found in van's & trucks & didn't need a computer to work the OD
I could be wrong but I don't believe they ever used an OD trans. in Diplomats, or any V8 cars in the late 80's. Just trucks had OD trans. I believe all they ever had was a 904 lockup trans. in cars. A lockup trans. isn't the same as an OD trans. It just locks up the converter so it doesn't slip. It'll drop the RPM a couple hundred at most while an OD will drop it several hundred or more.
