Hmmmm, my LD465-1C truck will run 55mph. Not sure what is holding you up. It takes mine a good while to get there, but it will do it. How many miles and hours are on yours? Does it smoke a good bit at WOT? If it's not smoking you may not be getting enough fuel to it. Mine puts out a decent amount of smoke, not coal train smoke, but pretty good clouds will follow it down the road<img src="emoticons/icon_smile_smokin.gif" alt="Smokin'"><img src="emoticons/icon_smile_smokin.gif" alt="Smokin'">