ten years under a tarp... no water pump .... that's not running, for a buyer that means a discount in the price equal to a complete overhaul. Maybe an engine replacement... And, the trans mission will need going through, too. The wisest would expect a complete rebuild . The Hydraulic system includes the power top and power windows. It will need complete rebuild of lines, fittings, valves, cylinders and motor/pump. These are all negotiating points that lower the value. Don't listen to people that disparage Dynaflow. A Dynaflow in good working order is as reliable or more so as all other automatics of that day. But, any auto trans mission from 1950 sitting for ten years will need a rebuild.