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.
2016 WK2 Overland 4x4 Granite Crystal 3.6 <1K
<sold> 2013 JK Sport S Billet
<sold> 2005 WK Limited Inferno Red 5.7 QDII
<sold> 2001 TJ Sport Flame Red
<sold> 2000 WJ Laredo Taupe Frost 4.7 QD
<sold> 1997 TJ Sport Flame Red