Is there a tech article for rebuilding a power steering box?

The OP asked about a power box. A power box is a bit more involved. I think you'll need a press for some bearings, special tools. The big thing with Mopar power box, is the seal between the high pressure side ( 700- 900 psi or more) and the return is a twin O ring. If it leaks, the return side gets pressure leaking through and can push out the shaft seal for the input shaft. The FSM is the best book for this.