1st I would like to say that this is a great source of info, I have learned a lot by ready many posts. I have a annoying issue with my 2006 silverado 1500 crew cab. The truck has the 5.3 engine and auto trans with 3.42 rear. The problem is that when I am accellerating under load at about 1500 rpm's I get a very high pitched whine. It happens in every gear and only occurs when accellerating no matter what gear i am in it occurs at the same rpm. It is not an intermitant sound it happens every time I drive the truck. I don't notice any effect on the performance. I dont believe it is wheel bearing or a belt. Anyone have any suggestions. The truck has 53000 miles on it and other than this noise everything else is great. Thanks for any help.