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Mine just started doing it after 13000 miles. Reminds me exactly of my 04 F150 5.4 3V. It started squealing on cold startup. After replacing the belt, a time or two, they discovered that they needed to shim the water pump if I am recalling correctly. In any event, whatever they shimmed fixed the problem which wasn't a belt or pulley.
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2008 SD 250 PSD King Ranch 4X4, SWB, CC, Auto 3.73
Viper 791 XV alarm with remote start. FS2500 bypass filter. Edge Insight multi gauge. Line-X. Retrax.
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