Suspension "creaks" can be harder to find because you can't look under the car while driving, and you can't replicate the problem in the shop. IF a component is creaking, it does not necessarily show any signs of wear. Typically people who are good at finding a particular creak in a particular car had to find it in the same make and model before (design flaw) and the repair becomes the same throughout.

that said, the creak is probably the sway bar bushings on the k frame.