I have a 2003 ranger with a 3.0. It has the squealing noise of what is usually the idler pulley or a bad belt.I have replaced both of those and it wont stop. Ive tried to spray each pulley with wd40 that didnt help. Also the long metal rod trick didnt work for me either. Im out of ideas any help would be greatly appreciated

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2003 ford ranger 3.0 31/10.5 bfg allterains