I have one of the original lx pro's. for the diff's I would go fr-rr 5-7-2. You should have the 13mm shocks on it. They are very easy to tune. I would start with 40 weight oil fr and 35 rear. set ride height with the axles even and you should have a good handling car. set camber -2 in front and run 1/16th-toe out in front. Granted this is not a high end race car but for beginning should be fine and durable as hell. I put fr-rr pivot ball suspension on my lx pro along with pcr towers and just changed the springs to the stiffest ones they make,am not sure of the color. Only because the car is heavy.