http://www.amazon.com/Savage-X-SS-4-6-Kit/dp/B000FS5UKM, youll probly never have a problem with it, savage xss 4.6, its a kit so you can put it together your self and learn everything about it, there not hard to pu together but rather fun. i have one and there almost indistructable and go around 45 2speed. probly one of the best monster trucks out there, great for the price