help choosing a motor

[RUSTED]

i just got the Medusa 2300 kv 70m motor , and the difference between it and the feigao motors is amazijng , i dont know why was i wasting my money on feigao motors , anyways i went to the track today and stripped the rear diff , should buy another stock diff or get the hybrid bulk , i already have ofna titan diffs i think they'll fit , wat else do i need to buy?? bearing???shims???


heres a vid i made , only drove it for 5 mins at the track then the rear diff stripped

http://www.youtube.com/watch?v=eIMM3zRyZpo