Try a Front End Alignment. I was convinced that my rag joint was going out in my 99' LS 4x4. Turns out that where I had an alignment done about 10 months ago when I had my old shocks on that it loosened up pretty good in that time. I have since replaced my shocks and it still felt loose. I probably had a good 20 degree's of arc before my steering would respond again. Not anymore. Everything is as tight as a frog's butt in a watermelon seed fight.

Moral of the story. Get your alignment done once a year. :)