OK, just tossing this out there for anyone that just can't find the catalyst for their death wobble. I had taken my 2007 Wrangler to 3 shops, the last one being a 4WD place that specializes in 4WD with lift kits, oh, mine is lifted 4 inches. The 5th time to the 4WD shop after checking all of the stabilizer bars, tie rods, alignments etc. on the front end. The mechanic finally checked in the back, it turned out to be a loose shock in the rear, it would always act "nervous"(shaky) on cement highways or even on cement at all, but being my first Jeep I figured it was normal. After the mechanic tightened the rear shock, that "nervous" feel is gone and the death wobble is gone.
Now if I could get the weatherman to be right more often I'd be in good shape! (left my top down reading it wouldn't rain until afternoon today, it was storming at 5am, oops!) Anyway, I hope this helps one of you out there, that wobble is annoying and sometimes scary. Keep on Jeepin!