help finding the reason for death wobble

My friend is telling me to post this(he doesn't have good access to the internet) so response time might be a little slow. He has an 05 Jeep TJ X with 4spd It's not really modded, but it has is a 1" body mount lift. He was experiencing steering wheel wobble from 40+ for a little over a month so...

I'm new to the forum and to jeep. Ive bought my 2000 tj about a month ago and it had death wobble since i tested it. All ball joints and tie rods were bad so i replaced and that was a mission since they were rusted like no other. I replaced the hubs in the process since i had to cut them out...