Take a close look at your steering box pitman shaft (the one poking out the bottom). A little play here and a little play there adds up. After a certain age, removing the play becomes a pretty much continious thing (every year I replace something). A few thousandths in the tie rod ends, a few thousandths in the track bar, even a little play in the steering knuckle joints. Try having a buddy turn the steering wheel a little left and right, while looking closely at the pitman shaft or the ball joints. The steering knuckle joints can be checked by lifting the front end, jack stands under the frame and having a buddy pry up (lightly/moderatly) with a peice of 2 X 4, you can often hear the knuckle joints (ball joints) click or see some movement at the joints.
Another thing worth a look, is the universal joint in the steering column shaft. I´ve never seen a Jeep have one fail (other than a wreck) but have seen a few Dodges with excessive wear.