When you buy a Duratrax you have to be happy with it's stock form because there is not any aftermarket parts for it! Now if you are handy and have the machines to build stuff you can make your own parts? You may be able to use the 2 speed trans off the MT Pro but I would have to see a Evader up close to be sure! I like Duratrax's engines and the one that you got is made by O.S. so I know that has got to be a good one but, other then that your kind of stuck with what you bought!