I have a 01 sport 4.5 lift, 33's, sye. Just started today getting this clunk from under the center consule, had wife put it in drive and roll forward and back. It clunks going both ways. It don't do it when shifting back and forth, it's when it's just idling and moving. If you put it in drive or reverse and hold the brakes, no clunking. I can't hear the noise from outside the jeep but it pretty loud on the inside. Im gonna pull the inspection cover on tranny tommorow and make sure flex plate bolts are tight, all 6 u joints on drive shafts have less then 500 miles on them and feel tight. Tranny mount is in good shape as well. Any other possible causes?