The Jeep Wrangler death wobble refers to a vibration that can be caused by your track bar bushings, collars, or brackets which makes the axle want to free itself from your Wrangler. Check out the track bar bushings. If they are in poor condition, replace them. If your bracket is loose, tighten it to the suggested specs. Now if both are in perfect condition, check out your lug nuts and studs. It’s a possibility that the lugs have come loose and have given you a similar concern.
Always follow installation instructions that come with your track bar, but as a summary, adjusting and installing a track bar is pretty easy. Adjustable bars will have a sleeve, so you don't have to remove the track bar ends. You'll want the adjustable end at the axle side.
As far as adjusting your new track bar is concerned, does one tire stick out of the wheel well/fender more than the other (usually driver’s side)? If you're unsure, measure the distance from the tub or suspension, something solid and equal on both sides to the outside edge of the tire. If one side is longer than the other, split the difference. This number is the approximate amount you need to add to the track bar.
When measuring the track bar, front or rear, measure the distance between the eyes or holes of the track bar while ignoring the curves and bends. Record this number and set your new track bar to this amount plus the amount that you measured before. This should be almost, if not, perfect.