I have a clunk that sounds like it's coming from either the post between the left side doors or the left side passenger door. It only happens when you hit a bump a certain way. When I get in the back seat and have my wife drive, it doesn't clunk. I've even tried leaning between the front seats from the passenger front, but it won't make the sound then either. I've had it to the local dealer three times and they can't find it either. They even replaced the front seat belt/shoulder strap assembly and the lower post trim, but it didn't make any difference. They said that they isolated it from the fenders that can move around. I just changed from my 35" tires/Rugged Ridge wheels to the stock setup for the winter, but it didn't make any difference. I have a 2-1/2" RC lift, OME HD front springs, ACE rock sliders, F911 hardware that is properly torqued, RR XHD front and rear bumpers, tire carrier, winch, and HID lights on a bull bar, so I do carry several hundred more pounds than stock. The dealer said it is from body flexing because of the lift. I find this hard to believe. I've never taken it off-road....yet. Does anyone else have this issue?