Replace the steering pump. They aren't made for big tires.
quoted from CJ Forum:
The Ross steering box on the old CJ's are notorious for excessive play. There is an adjustment for it on the side of the box, but in my experience it won't "fix" what your describing. Also, don't rule out that part of the play (no tire movement) can come from worn ball joints; many moving parts in an old CJ's steering linkage... In my case when the wheel was centered, it would move about 5" to either side of center before any tire movement took place!! Definitely unsat, but I lived with it for many years (also unsat!)... My solution was a Saginaw P/S conversion; and I haven't regretted it since completion in '98. I'm sure there are resources for rebuilding the box; but unless looking to restore the CJ, it's just not worth it. JMHO!!
Read more: http://www.jeep-cj.com/forums/f19/is...#ixzz1ntyUX8g7
2004 Jeep Rubicon Yellow, 35" KM2, 4.5" Lift
1991 Jeep Cherokee Limited 33" KM1/2, 4" lift
Founder of Georgia Crawlers 4x4 Club