I recently swapped in a Dana 60 in my 75 K5. It has ORD high steer and crossover steering. I used a 73 C10 steering box to fit the cross over steering. When the box was off it seemed to turn very smoothly, was tight, and it seemed like a good box. I put it on, bleed the system a number of times, and it seemed to move very smoothly back and forth with the wheels in the air. When I try to drive the truck, it is basically impossible to turn to the left... feels like I do not have power steering to the left, but works great to the right. I have bleed the system numerous times.... the last couple times no air showed in the pump while we were cycling the steering so I don't think air in the system is an issue. So I have been told that the problem is the pump, and someone else told me the issue was the box. Before the new steering box went on I could drive down the road with one finger so I have a hard time believing the pump could just go bad. Anyone had any experiences with something like this? Hate to run down and spend the money on a new box if I don't have to. Thanks guys.