my diff is blown but the car does run the moter. it runs like it is soposed to be in there. but i just need a new diff. argg!! it is just the stock one that comes in the kit. i happened to have a couple around. it says S.T.D motor. on the back(no seriosly) the moters that come in the xmod are accualy these type of moters! if you look on the back it says S.M.C. motor. my theiry is that rs just buys them from tamiya and puts their sticker on them! here are the moters side to side...