Whenever im flexing ( going through a rut or even decent rock) i get this noise from the front coils. It sounds like a "doyingg" noise. Why would it be doing this? I checked for rubbing and all and nothing is close to them that would cause that. There iron rock offeoad 4.5inch front coils. I do have bumpstops also.. even when one of them is compressed you can hear it compressing. Any ideas? This is on a 96 cherokee