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smaller crank pulley?

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Old Oct 9, 2009 | 08:56 PM
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tonyevans69's Avatar
tonyevans69
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From: mckenna washington
smaller crank pulley?

i bought a 2003 f250 with the 5.4l, and the belt started squeeling about a month later so i bought one. when i went to put it on, it was too big. the guy at napa said that the belt he sold me was the right one. i had to get on that was about 2 inches shorter. well i looked at a company truck at work the other day that is the same as mine and noticed that the crank pully was a little bit larger and has what looks like a vibration dampner on it. also, my pully has 2 extra grooves on it for the belt.. so my question is why would someone put a smaller pulley on it? thanks
 
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Old Oct 10, 2009 | 10:36 PM
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LxMan1
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From: Louisville,Ky.
It is probably an underdrive pulley that slows down the belt driven accessories with will give about 5 hp up around 5000rpm.
 
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