The S14-3 Series Center Gear Diff. Set is now available. It fits100% to your S14-3 without having to add any extra parts. This new center gear diff. system makes your buggy easier to drive on dirt and even on carpet. It comes standard with a 81T center spur, also available in optional parts for 78T(SW-2503134-02) and 72T(SW-2503134-01).