Just recently the truck started to squeak while idleing/low rpm. It doesn't get louder or faster with rpms. It does it cold or hot, in park and in drive. And some days it doesn't do it at all. I don't get it, it almost sounds like an alt. bearing going bad. The truck has 3,500miles on it so I can take it in to the dealer. I just wanted to see if anyone has had a noise like this and what the outcome was.

Yep a few people have had the same problems. It could be a bearing or it could be the belt tensioner. It could be other things too. I'd have it looked at.