Another unloading auger swing valve can be added on top of the original to power the fore_aft. Hopefully SD Man will step in here but I think he said a new valve through Case in around $1000 and used ones are hard to find. Some guys are adding the electric spitter valves for tractors after the unloading auger valve to that valve can run the unloading auger swing or the fore_aft, this might be the route we go as it would only cost $350.