I have a nitro bullet St. I ha ve put a 3.3 traxxax motor on it. It is very fast about 60 MPH.it about as fast my jato . I made it two wheel drive and made lock blockt for for rear end so both wheels have power. I put two washer under motor mount.to lift the motor up were it would fit.and no problems with the drive train just fine. And you can put a bigger clutch bell on it. I know aleast a 15tooth but I'm using the stock. And running 33%nitro and no that want hjust watch tempurt it been using it for years."