Tru,
About the only thing that I understand about cars is the electrical systems. And since Warren's is already not working I could try a couple of things I would like to do but don't want to do it on a working system. Mine had the wiring so messed up when I bough it that I spent a month tracing and trying to find leads that were wrong and in some cases I just cut the whole loom and went to NAPA and bought colored wires and ran a whole new set. Mine are all white with the little numbers on them every so often and of course when the guy painted the motor compartment, he painted the wires. And with my eye site, I can't hardly make out those small numbers anyway. I actually traced one ground lead to a screw that was screwed into the fiberglass. I finally got my toner from my old Lab days out and used it to trace wires from front to back.
What year is your 3:89s? My Ford gear ratio book only shows them for the 9" until 1967. Also do you have the complete pumpkin or just the ring and pinion gears?
Ron