i would try to go with the original e-zilla parts as well, i got one, and the first time i ran it i backed it into a car tire at half throttle and snapped the RR shaft just in front of the hole that the set screw for the axle goes into, ordered a new one, and have been romping on it ever since with no breakage. it was my first hobby grade r/c vehicle and i wasnt ready for the raw power of the zilla! have broken many other parts like shock ends, c-hubs, and the body mounts, but no diff shafts!