2021 1500. When hitting bumps or uneven roads there is a rattle under what appears to be the drivers side floorboard. It is like a chatter where it lasts a couple of seconds and stops. Nothing glaring is obvious upon inspection. 15k miles ago the cab was taken off to replace the engine due to a failure. I am thinking it could be a body bolt. Anyone else have suggestions as to where to look or what it could be. I am hoping to have some sense of where to tell shop to look before bringing it in. The dealership needs to be very much directed to check certain areas.