I converted the TT MT and ended up using a 12xl and a 16t pinion. To save me some typing you can read my post here:
http://www.rcuniverse.com/forum/m_43...tm.htm#5646087
I did not run it as a nitro and plan on selling the motor and radio as new in the near future. Here is a link to the truck I converted:
http://www2.towerhobbies.com/cgi-bin...I=LXMPT0**&P=K