Just a guess, but, I would think the bushings are dried out. Not enough miles on them for the shock to have an internal problem. Could just replace the bushings and see if that fixes the noise. That would be a cheap thing to try first. Next question will be what kind of bushings. If you ask you will get 5000 answers. Almost any kind would be a good try to find out if that is the problem. Or you could just squirt some lube on the pivot points to see if that stops the noise.
