I had death wobble in 2 Jeeps that I owned, in addition to a friend of mine's TJ wrangler. Both times it was a missing bolt on the frame side of the track bar. We have no idea how it came out in the first place, but everybody I know with a TJ (or XJ for that matter) I show them where to look from time to time...
~2005 Disco 3 "Moneypenny"
~2008 GTI TSI
~If you can read this, thank a teacher. If you are reading this in English, thank a Veteran.