I would replace the idler pulley and tensioner pulley, maybe even the tensioner assembly. Check your belt well you're under there, it maybe time for one as well.
2001 WJ 60th anniversary edition 4.7 quadra-drive
5" hybrid lift, 265/70/17 Guard Dogs load E, bilsteins 5100's, addco sway bars, JKS front quick disco's, JKS adjustable track bar, KOR durometer track bar bushings, IRO crucial path front L.A.s, 1.25" Spidertrax spacers
Colorado Jeep Club Member #262