Power steering fluid loss.

[WyattTX]

On my my '85 C10 Sliverado with a replacement 350 SBC engine, my power steering fluid is going somewhere. Removed my power steering pump, inspected it, and found no evidence of leaks. I also replaced both hoses. However, I am still losing fluid at a rapid rate. I have even popped the hood open, and watched the all the components, while a friend turned the wheel, and found nothing. The only thing I can think of, is the steering gear box. But I see no evidence of it leaking. Does anyone have an idea, what could be happening? Thanks.

PS: I know it has been a while since i have posted here, but I will try to be a little more regular. I cant believe how much time has passed.