The RH does not require any any electronics to shift first through third gear. The gov assembley is in the extension housing and and shift by line pressure. To get it into OD or converter locked, there is 1 solenoid on the valve body. It has a 3 wire plug on it. You supply one wire with a 12v source. Then mount 2 switches inside the vehicle, run one of the other wires to the switch, then to ground. And same with the last (third) wire. One will control converter lockup one with control 4th gear. If you have a manual valve body, you will just zip tie the pressure lever back so its full line pressure at all times like dslhrdr's is. If you choose to do this, make sure you get a converter maybe 100rpm looser because the higher line pressure off idle will make it want to push through the brakes a litter sooner vs if the pressure cable was hooked up and functional.
In my old dodge, i converted it from a 5 speed to a 47RH so thats how I know all this. If you run a 48RE bottom half of the valve body, you will achieve lockup in 2nd without modifications. If you run a factory 47RH valve body, holes need to be plugged and some drilled in the valve ports to allow it. A small hint-you WILL want it to lock in 2nd, and if you setup the valve body for it...When your staging in 1st gear, go ahead and lock the converter switch so as soon as it shift into 2nd it will shift then immediatly lock as fast as possible. Hope this helps if you want anymore info just ask :thumb:
