I'm having some problems with my 95 Exploder. After my last off-road trip, I came home with a new rattle. Something is rattling when the explorer rolls over larger bumps. It is a sound like when the brakes are walking. I replaced the brakes(all 4), the u-joints, the 4-wheel driveline and tightened the nerf bars. The rattle is still very noticeable. Does anyone else have this problem and if so, do you know what I need to look at next?