Hey Ice I'm running a manual steering box but got a 24:1 box if I remember right and I don't have a problem. I like it better than power and much better than a stock 16:1 if I got the numbers right.
I'm running a brand new 20:1 from PST( ithink) it's just super tight even at speed.i might try to loosen the adjuster on it a little, it was so tight when i put it in that i couldn't turn it by hand... they told me that's intentional