This might have already been covered...

How much pressure can the box take? What is ideal? What pressure did the factory boxes this came from run?

I ask because my factory box is now leaking. It's probably the original box with original seals. I'm using a 5.7/6.1 power steering pump now, which might have played a part in my new leak.

I'm thinking a number of guys have successfully run a factory 3G Hemi pump with a factory old school power steering box- anyone have firsthand experience?

If I'm not mistaken the Hemi pump runs up to about 1450 psi.