The front suspension, brakes, and steering is all new on my 63 SF. However, the steering is so stiff that there is no caster return: the car stays in the turn unless I manually wind it back to straight ahead. Alignment is close to specs. The guys who rebuilt the box say to do a "pinch test"; pinch the return line, and if you can compress it, the pump is weak. We did, and I can compress it almost closed. (Brand new hose). So, what advice? Could this be the cause, new, stiff box with old weak pump? Is it worth rebuilding the steering pump? Thanks for advice!