It's not terribly bad but I get a sound of either metal hitting metal or a "popping" noise when hitting fairly normal bumps and an almost popping sound when taking a turn with an elevation change. I thought at first the bed was hitting the cab but there is plenty of clearance. The noise does seem to come from right behind the drivers seat but it's difficult to tell exactly where since I can only recreate it while I am driving. Is there anything that needs some grease in that area? Perhaps something that a power washer might have removed? Or anything to check first? I've not taken the bed off before so I'm not sure of where the contact points are and I don't see anything that looks like it would be touching even in a turn.