get this setup, it will be perfect for it, i have it on one of my tornado xp's, it comes with clutch bell too. http://www.clermontmotorsports.com/s...iff-kit/Detail

if you want to keep it a 2 speed, you will need this to lower the gearing for bigger tires:
http://www2.towerhobbies.com/cgi-bin/WTI0001P?&I=LXM730
http://www2.towerhobbies.com/cgi-bin/WTI0001P?&I=LXM861
http://www2.towerhobbies.com/cgi-bin/WTI0001P?&I=LXM766


make sure you have the same size tires and rims or you will have a problem, they have to be the same diameter.