I've tried different motors including a longer one from ebay, it worked real good but the best beneffits have come from the latest motor Ive used, its from a tower pro mg946r servo, you will need 4x 2mm washers to mount it onto you existing gearbox, and you will need to transplant the pinion from yout motor to it, but once you do the sumo will turn into a beast! It will be faster and MUCH torquier! The best beneffit will be the lower running temperatures you will get on it since it hardly has to work at all because of its huge improvement in torque. My buddy has been doing the losi into sumo transplant which would also work if thats the way you want to go but I think the "big block" choice might be a bit easier and safer, but again, theres choices for you
tower pro mg946r servo >>> So is this motor still the best option for the sumo crawler? Is getting the motor out of the servo case and installing in the crawler easy enough?