I wish I could take credit for that but I can't, its on the link I posted to ROF. I'm currently on my third TJ and second rubicon and I have done every bit of suspension work on them since 1999. My current tj has 35's toyo mt's, Hutchinson Beadlocks, Rokmen upper and lower control arms with johnny joints and a clevit bushing on one end, heavy duty currie track bar, and the currie correctlync, and some other goodies. Throughout the years I have had to swap all the original oem parts out with new oem parts or aftermarket upgrades and then ensure that things are tight, aligned and balanced it solved my problems. My worn control arm bushings on the original lower control arms had an amazing amount of play in them that caused my initial wobbling that later evolved into death wobble as everything began to wear out from the constant wobble. Almost all of my jeep oem control arm bushings and tie rod ends (TRE's) were in my opinion severely worn at 80,000 miles. I'll add some info from Stu's website as well, as he explains things far better then I typically do.
Anyways I suggest setting the toe in alignment first as its easy enough to do yourself. Know that you can not adjust the entire alignment as not all of the original jeep suspension is adjustable. You can basically only set the toe in alignment with factory control arms along with some minor other adjustment. After you have done any suspension height adjustment (up or down in height), you need to take a look at your front axle's toe-in setting. The TJ runs toe-in.....which means the leading side of the tires point inward a bit. looks like this => top is the front of your tires, bottom is the rear
/-\ instead of
|-| or
\-/ If you were to create an imaginary line drawn around the center of a tire on its tread, you would find that the measurement at the front of the tire is slightly less than the measurement taken on the back side of the tire. 1/8 of an inch or 3.175mm is the difference you are aiming for, so the back of the tire would be slightly wider than the front. Properly adjusting your vehicle's toe-in setting will help improve handling (a TJ with zero toe-in will seem to wander a bit on the road) and it can certainly extend the life of your tires compared to a vehicle where the toe-in is out of spec. Proper toe in is critical in getting rid of death wobble and in some cases i have seen it eliminate death wobble just by adjusting the toe in.
Here is a photo explaining the basic front end setup.
The following are links to an easy way to set the toe in alignment.
http://www.4x4xplor.com/alignment.html
http://www.stu-offroad.com/steering/align/align-1.htm
after addressing the toe in then I would check for play in your tre's, ball joints, and bushings. A visual inspection of these parts is free for you to do with some elbow grease. Finally I would say tires..I had a bad set of BFG's and I could never get them to balance which constantly gave me a wobble at certain speeds (45-52mph). The only reason I put the tires as last is because of cost to replace brand new tires which may have a problem not visible to the naked eye with another set of tires. If your tires are visibly worn, cupped, or damaged then they will only make finding the problem worse as worn tires alone can and will cause death wobble. An easy way to decide where the main issue causing death wobble is when does it happen? *Over bumps then yes death wobble, and parts are worn out. If its more at certain speeds then the tires tend to be the culprit.
Jim Frens is the man! I cant wait until knowwhere2jeep re-re-releases the Nth suspension parts again! i've already emailed them asking them to take my money