duct tape & zip ties
Join Date: Jul 2006
Location: Willis, MI
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Could be a bad bearing. Could be the tension pulley. Instead of spraying belt dressing on there I would sprinkle babypowder on the belt. The baby powder will absorb any and all moisture on the belt that is causing the squealing. If the belt keeps squealing then you know it is something else and not the belt.
The pulley alignment maybe off from when you installed the new alternator. This will also cause the squeal.
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2005 6.0 Crew Cab Long Box Lariat, current truck
2004 6.0 destroyed by contaminated fuel
2002 7.3L burnt