OK, I'm at a loss here-the hubcaps on my '96 F250 XLT 4x4 w/factory aluminum wheels (looks like the Budd wheels on a big rig) are really noisy, kindof like a cataa catta catta when traveling down the road. The caps, both front & rear seem to be loose but are not. No broken clips on them, either. There is nothing rattleing around inside of them, either. This is not speed related as it happen as soon as the wheel rotates. Short of laying a bead of silicone around them, which I really don't want to do, does anyone have any suggestions? Thanks! Jay