I have a 2002 Wrangler, 6 cyl with auto trans, that recently started to make a high pitched noise when I push down on the gas. It is a bit hard to describe the noise. Not quite a whistle. Almost like metal parts rubbing together to make a high pitched noise. I believe it is coming from the front. It only appears when I lightly hit the gas. If I accelerate quickly, there is no noise. It is not always there, so I have a hard time pinning it down. The noise does change pitch depending on what gear I am in. I do not hear the noise when in neutral or driving in reverse. I brought it in to my local shop for a test drive but they did not hear anything. I'd appreciate any ideas on what the noise could be.