I'd recommend the saturn 27t personally the 35 is INSANELY slow (it does have a buttload of torque though).
I got a saturn 27t in my elec converted nitro MT1 52t spur 14t pinion with dirt hawgs on it and the motor gets a little warm after running it on full throttle for 5 mins straight. Will be honest used the 35t originally in the setup and it didn't even get warm.
stock in the wheely king
http://www3.towerhobbies.com/cgi-bin...?&I=LXPZV0&P=7