6.4l Serpentine belt chirp noise

[makuloco2000]

One of my best repair videos. Here is the most common concern I see and the REAL fix, there is a tsb from ford on changing idler pullies, I have never seen that work. New belt and tensioner fixes them everytime. The other thing that sounds like a belt chirp on these unfortunately is the roller lifters failing as the need bearings give out. Let's hope your truck doesn't have that issue and this is it.