13.5t is surely to small for a 4wd SC, it will be way to hard on that motor to get around the track especially up any jump faces. You will most likely burn the motor up with high temps. Just save the motor and try to find a used HV 6.5t or 5.5t they are usually pretty cheap. I ran one in my SCRT for a while and it was competitive.....Just my two cents worth