Don't slam it. Nature of the beast I suppose. All I've had sounded like that but it is part of the cars character. I wouldn't spray anything on it but if is really bothering you, its your car.
A quarter century ago when I was buying any part that would fit a 70/71 Polara I had picked up an NOS set of guards similar to these or the same as these. When I was selling off my stockpile many guys wanted that set. They were not a Mopar part but had desirability (I guess) . I presume for...