The previous owner of my jeep had only put 2" springs on for the lift. The tires he had on it were somewhat chopped up and mis matched. They were all BFG AT's but some had a lot more tread than others, not to mention one of them was an old school tire that had a different side wall.
After putting on a new lift and relocating the trac bar, The death wobble was gone. All I noticed after that was some vibes in that speed area where the death wobble had occourred. Then I replaced the tires and had an alignment and the vibes seemed to disappear.
I originally replaced the stearing stablizer since the guys at the 4wheelparts store said the stock one was only good for about 15k miles. It helped some and made the wobble not quite as violent, but it was still there. I also lowered the pressure in my tires which helped with the death wobble, but isn't real good on your tires
"97 TJ, 4.0, 3" Black Diamond Suspension, 2" body lift, JKS disconnects, Borla Exhaust, 35x12.50x15 BFG MT's, G2 Dana 44 Rear Axle Detroit Locker