Robert Davies: What did you do to fit that? What kind of gearbox did you use? What pinion for the 480? Was there any other modification done so the RX18 won't burn as Captain B warned? Max-U52: That sounds impressive. What exactly did you do to give it scale speed? Did you use metal upgrades for your ZTZ-99A? I've been looking all over eBay but couldn't find these 400 and 480 motors. I'm not sure if I'm searching right. Where do you get these motors? My tank is on the heavy side because of the metal tracks and sprockets, and I never knew when I started that the stock motors would/could be inadequate when using those upgrades.