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2001 gmc 1500 P/U 4X4

Automatic - going forward a hgh pitch sound- goes away in between when in sceond- but i hear sound of a low growl when going faster

No grinding sound, no rumbles , rid is still smooth

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  • Duane Morse
    Duane Morse May 11, 2010

    it could be a vacuum leak check all you vacuum lines for cracks or missing maby off bend the hoses to ensure no cracks are allowing air to **** through them it possibly stuck in 4 wheel reach under the vehicle to grab onto the drive axle it should spin free on the front axle all in all look for any visible items that would be related to what i said



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