For the last year or so i have had a creeking sound coming from the rear of my car, it only happens when i go over a bump. I cant find the problem. I thought one of my tools might have dropped under my spear tire, and was bouncing around. I took all my stuff out, and i still cant find it. Does anyone know if our springs with make a creek/pop when going over bumps? If anyone has any ideals as to what it could be, let me know. Thanks.