I was helping to do some work on another jeep last night.
and I needed to pull a part off my Jeep blown motor to fix his.
As you know the grill and fenders are off mine so as I was wrenching
I dropped a socket and went down to get it as I got up I grabbed the drivers side tire and pulled on it.
The tire moved to the rear about 1/4 to 1/2 inch. I then grabbed the tire and attempted to rotate it. It moved again. Not the Jeep but just the axle on the drivers side.
Looks like the axle U bolts are loose and it is allowing the axle to jump around.
This explains the broken degree shim and the bad tire ware I have been having on only this tire.