ORIGINAL: mxdragon

i have a mt 2 rtr...i have had it for about 5 months and i have a os 18 tz motor in it....it is wicked fast but my rear diff keeps stripping....i have the hardened one and i put a new one in today and it stripped in 3 tanks its kinda angering. would aluminum diff cases prevent this because i think the torque fromt he motor pushe the case apart a little giving it a bad gear mesh?