Picked up a 99 on a whim. Fix death wobble or replace with new lift?

That movement of the track bar is really bad. It looks like a stock track bar but maybe the frame mount hole was drilled out previously for a different track bar so the conical bolt no longer fits properly? Why else would it be loose like that? At any rate, you’ve got to take care of that for sure. There also seems to be some movement in that other rod end. I wouldn’t be surprised if all the rod ends, bearings, etc. are worn out.