NE: Trust me... replace your Belt Tensioner Assembly... after 2 shreaded belts, within a yrs time... I finally chose to graduate from tard school... I replaced the Belt Tensioner... took about 20min... and replaced with a motorcraft belt... after 500 miles there has been no squeal.. and no more shreaded belts.. After 280K miles, I have chose to just be smart and replace all the small moving parts outside the 7.3L... I'm tired of having to worry about parts failing...due to I was to dam lazy to check them, or just being dam stupid... And plus I have a Family who keeps telling me... U Can't Fix Stupid! I'm trying hard to prove them wrong.