"Death" wobble?

[XJ Wheeler]

That's a Rubicon Express kit, 4.5" with 2" spacers and blocks most likely. And 6.5" on short arms is quite a steep angle on the control arms. Plus, at 6.5" that steering really needs to be upgraded, 4.3LXJ is has extensive knowledge on the subject. Does the transfer case have a slip yoke eliminator? If you don't know just post a pic if the rear of the transfer case and we can tell ya. If it were mine i'd rip the spacers and blocks out, the rest of the components should all be built to compliment each other. The upper arms aren't adjustable, meaning if you want to keep the spacers in the front you will need adjustable arms (a couple hundreds dollars unless you get some used ones). Hope this helps.

[Dredwolf]

This is why I LOVE this forum....everyone is trying to help solve this problem.

There is far more expertise already in this thread than I can offer, but it looks like this XJ had sway bar disconnects at some point. Once the other issues are sorted out, adding a front sway bar back may "stabilize" the pavement experience.