So, I shredded a serpentine belt over the weekend on my 01 DII and finally got it replaced today. I got a new belt on, fired up the truck and noticed a faint rattling noise that sounded like a chain running over a metal surface. Other than that, the truck ran fine. I shut it down and looked around the engine compartment and noticed that the new belt was straddling the power steering pump pulley by 1/8-1/4". I took the belt off again so I could look at the pulley alignment between all of the components and it looks like the power steering pump pulley is 1/8-1/4" more forward than the other pulleys/idlers and is out of alignment. I looked at the attachment bolts to the pulley and the pump bracket and it looks like everything is tight. I need some help here as to what would cause this.

 

two possibility one the bearing in the pump is bad allowing the pulley to move forward. the other would be the pump was replaced and the pulley was not installed all the way on the shaft.