Big-O, I suggest you contact Ted Mitchell in OK . Ted sells a total conversion for windows that completely removes the stock regulator, levers, motor/gearbox and replaces it with modern cable drive system. As installed in my '72-1/2, it removed something like 6 lbs of weight from each door, allows the glass to go completely down instead of letting 1/2" stick up, and the speed it rolls up is now so fast, it's close-to-dangerous! No wiring changes, same fuses & only a Crescent wrench & screwdriver needed to install; 30 minutes per door.