I was in the same boat with my death wobble. I replaced my steering linkage and my track bar and it didn't change a thing. Then I went with some RE drop brackets and got my castor in factory specs and it was gone!

 

I know my caster is out, I might try that..either way i kind of want to upgrade my track bar for trailing

Edit: From looking up a little about drop brackets everyone says they're not really useful unless you have a higher lift like 5 inches. I know talking to my mechanic (He's my dad's best friend since high school) it's possible to grind out more of a cut out to fix the caster

 

I'm up around 6" of lift so I did them for ride comfort until I can afford long arms. I have upper and lower adjustable arms and that helped me dial my castor in to 5.5 degrees

 

So, I may put this on hold because, last night I got in the Jeep to drive home from work and felt my steering was abnormally loose. Like I could go to 11 o'clock position to 1 o'clock position with no change in steering and when I would hit a bump the tires would move around. So I did 40mph all the way home and even had an instance of dw from a bad bump at only 40. And I knew something was up because every time I hit a bump I would hear a clunk. So I got home and made the gf wiggle the wheel a bit and my track bar was completely loose. So I tightened that up to where the shop that did the lift had marked where it "should" be and it was still pretty loose. I tightened it all the way and got about another 1 to 2 turns in it. While I was down there I replaced the stock steering shock with a RC one. I was shocked to see the RC shock was almost double that of the standard one. It was also shock go see that I could literally push the steering shock all the way in without any force. So, all said and done I took it for a test ride on the expressway I take every day and made sure to go over some bumps at 70-80mph that have previously given me DW at only 50mph and nothing. So as of right now I think I'm set. I may wait a little bit so my wallet stops hurting before I upgrade the track bar

 

Awesome! Just make sure the track bar mounting holes didn't get wallowed out when it was loose.