I've got a 97 xj on 33s. I have a slight wobble in the front end around 55-60 it'll vibrate for a second or two but will correct it self if I speed up or sometimes slow down. I have just recently (past 2 months) replaced both tie rod ends, Durango steering box swap, iron rock track bar with new bracket, drag link and end, lower IRO control arms, had tires balanced. I've had the upper control arm bushings and ball joints replaced in the last 8 months. I've check multiple times to make sure everything is tight and nothinf broken. The only thing that Looks bad is the steering stabilizer is leaking a little bit of fluid but to terribly. If any one has any ideas. That would be great.

 

Sounds like it's just a vibration, not Death Wobble.....yet. Make sure everything is tightened down properly first (seriously, check and check and check). Even if you've checked before, check again.

A leaking steering dampener should be replaced; I'd do that asap.

Mine has a slight steering vibe at 50mph +/- and always has. just for a second, annoying...

 

How are your tires? Worn?

Go get them balanced