Mine ended up being my wheel bearings. My track bar and ball joints were all fine. My u-joints were shot too. Had a long weekend getting all that rusted crap apart!

 

I fixed it I'm so happy lol. It ended up being several things. Track bar on frame side was slightly loose not bad at all. Re torqued my front pinion nut I had a small amount of play there. That took care of the death wobble. I had a slight shimmy at 40-50mph and it was a bad u-joint on the driver side axle. The u-joint that was bad was only 5 months old. Now after 3 hours in my garage it rides perfect

 

How do you know or test for u joints or wheel bearings are bad?

 

Put ur hand on the u joint while someone turn the wheel back and forth and feel for a catch / pop be careful not to smash ur hand. Bad wheel bearings make a grinding noise while the jeep is rolling