Duramax serpentine belt chirp

My truck had the chirp squeek. After checking out the forums, I learned about the Duramax Chirp from other members. I got new pulleys and Goodyear Gatorback as everyone suggested. Just as an experiment, I tried the new pulleys with old belt first. The squeel was the same. I put the Gatorback on, and the chirp is gone. I am no longer embarrassed to pull into a drive-thru.

This proves that it pays to listen to other's experiences. Thanks everyone.