Maybe u guys could check into the gears on the pro hurricane or monsoon, the rears are tough in them. I bashed the crap out of the hurricane xtr and the rear went after 1 and a half gallons of fuel, the front one was still going strong. They sport the .28 engine and i believe they are steel. not sure if they will fit haven't had the earthquake rears apart yet. Or maybe the whole diff with a little cut or chop. just a thought!