power steerinb box replacement

First: I did search for this, quite a bit, but for some reason I can't find it.

1. Any good writeups on replacing the power steering box?
2. I've seen mention of using a YJ box - how does that work, and are there any writeups on it?
3. Is "power steering box" the same as "power steering pump"?
thanks!

the 'steering box' is mounted to the 'frame' and actually moves the steering, the pump is attached to the engine and spins with the belt, it has hoses going to the box. I dunno if a YJ box will work, probably depends on if the hoses fit, I used a 93 XJ box on my 87 XJ, and needed to use the newer hoses to hook up to it.