the stock traxxas 2055 servo can steer the rustler just fine, its only a 2wd stadium truck. rustlers generally push when cornering, especially under acceleration because the power makes the front end lighter and the front tires cant grip as well then. you can fix this by putting some weight up front. and a good way to get weight up front is to zip tie your batts to the front shock tower, but this can take rear traction away. another solution would be to get some good front tires, not dirt hawgs or gladiators, im talking about real front tires that have sidebite tread patterns. Pro-Line Edges bite really well, you should try using them too.