You will likely get better responses in the TJ forum, but I had 31's on my old TJ with no issues (before I lifted it and went to 33's.
2013 JK Sport S Billet. AT, 3.73, 430N, Truck-Lites, AEV CHMSL, Rubi Rails, Rear Cam. 23K
<sold> Inferno Red 2005 WK 5.7 Limited QDII
<sold> Flame Red 2001 TJ Sport
<sold> Taupe Frost 2000 WJ Laredo 4.7 QD
<sold> Flame Red 1997 TJ Sport