Glad the OP got his issue fixed. Just to contribute another cause for anyone reading this thread, several years ago I chased a "chirping" belt on a Tahoe with a 5.3. Replaced several belts and idler pullies before I noticed the PS pulley (which I had never removed or worked on) was out on the shaft about 1/4", making it not line up with the water pump pulley. The belt was slipping forward as it rolled across the water pump pulley, causing the chirp. (My clue should have been the letters wearing off the back side of the belt in just a few weeks after installing it.)
I used a pulley installation tool to run the pulley all the way in on the shaft and the chirp went away for good.
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Mike
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