I have a 400 in my '53 and when the engine is cold, the power steering works fairly well. When I take the truck for a drive, and the engine gets up to working temps, the steering gets really hard to turn when I am stopped. The power steering pump is really hot to the touch (seems fairly normal, however). I am thinking that I need a cooler for my power steering fluid as it is probably getting too hot and losing its viscosity and effectiveness. Does this sound logical, or is my pump on its way out? I have seen power steering coolers on alot of trucks... Thanks for the feedback