Faulty sensor somewhere? Your seat belt buckled? All the lights in your cluster work? If a light is burnt out (or removed by a previous owner) you might not be seeing an indication to go along with a noise like that.
2000 Mustang GT Steeda build #48. Bolt ons, suspension, Novi 2000.
Just because I give you advice, doesn't mean I know more than you. Its just means I've done more stupid ****.