Holy crap, your gonna put a big block in a st. That seems pointless to me. Your never going to be able to keep the truck from flipping over. Even if you buy a os 18 cv-rx, you would still have a hard time keeping the front end down. I would like to see a vid tho with this sh28 lol. I would try to get all metal gears. Damn traxxas doesnt make metal spurs yet and I jsut completely stripped one yesterday.