I installed a 4 inch skyjacker lift early in the summer but kept stock wheels and 265/70 R17 BFG AT's. Had no issues (other than rear track bar bracket breaking)
Anyway, Friday I installed XD series 795 Boss wheels wearing 315/70 R17 BFG AT and on my first test run, hit a small bump with right front and wobble almost yanked the wheel out of my hands.
Since then I've played with air pressure, rotated tires all around, and checked for defective tire/wheel issues, all to no avail, though issue is somewhat minimized at lower tire pressure.
Reading through the forums last night, it appears the "Death Wobble" is a relatively common occurence when upgrading tire size on a solid axle vehicle. Sometimes solvable by balance, stabilizers, adjustments to track bar, camber, alignment, ball joints; and sometimes not, leading some owners to go all the way back to stock to eliminate the issue.
I'm going in to get Road Force Balanced again, and to check alignment. Then start spending money.
Good luck. I'll update if I have any.