The fact that you started with a trans that had lost all forward and reverse gears leads me to believe you had some real problems before you started, and the converter code you have reinforces that. It is common for these units to loose the converter clutch and this debris can easily restrict the filter causing your loss of pump prime and subsequent loss of gears. Even if you unplug the harness on a 46RE you will have forward and reverse provided the remainder of the system is OK. You won't need to add a resistor on this vehicle with that kit, no worry there.You will more than likely need to rebuild or replace this trans and when you do, replace the hose and one way valve in the cooler line and do a GOOD job of cleaning out the cooler and making sure it is unrestricted.