I have an '04 Silverado and lately, after it sits a while, like overnight or at work, when I start moving there is a twang or spring like noise that happens in the first 10 feet or so of driving. I usually happens in reverse, but that just might be that the majority of the time after parking I back out before putting it in drive. Any ideas? Sounds like something under tension is snapping into place with a subtle twang. It's not in the steering, but sounds like it's in the front.