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I have always had bad luck with my serpentine belts squealing. On a Blazer and My Jimmy. The other day I noticed the crank pulley had just a tiny wiggle in it as it was running. My buddy had just changed out an V6 engine just like mine and still had the old one in the back of his truck full of all things metal before the scrap yard run. So I swapped pulleys (didn't cost me a dime I had nothing to loose) and low and behold it made all the difference in the amount of noise coming from my belt.
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