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Belt squealing

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I put a supercharger on my boss about 6 months ago, i cannot get 200 miles out of a belt before that dreaded squealing comes back! as soon as i replace it with a new one it goes away.. I did notice that the belt does glaze over. Question for those that running supercharges, does that happen to you? I'm i driving it wrong ( shifting ).. I realize that the supercharger run twice the RPM's, should i be downshifting all the way, i do have a habit of putting it in to neutral coming to a stop. Any feedback would be appreciated..

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