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Is F-150 Still King?
 
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Old 04-27-2008, 10:07 PM
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Bill Joanitis is starting off with a positive reputation.
Noise

I pull a 31` 5th wheel, have plenty of power, at about 3000 rpm, on a 6% grade I get a high pitch whistle like noise.
Is that normal,? Thanks
   
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Old 04-27-2008, 10:17 PM
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duffman77 is starting off with a positive reputation.
Could be the fan kicking in since your description is its happening during high engine load.
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