There's an adjustment screw on the power steering box...you can tighten up the steering with that first, and see if it works.
If taking up the play with the adjustment screw does it for you...you can call it a day.
There are also rebuild kits you can use to refresh the box.
I have a write up somewhere if needed.

_________________________
- TJ
2001 Xterra '03 VG33, SE 5 spd, 305/70/16's, Revolvers, UBSkidderz, Doubled AAL's, 3"SL/2"BL, winch/bumpers, skids, sliders, OBA, Snorkel, pine stripes....
Friends don't let friends drive stock.
http://www.gifsoup.com/view/501230/tj-tackling-crawlers-ridge-o.gif