2002 Chevy Avalanche make a whining noise when in 4 wheel o

2002 CHEVROLET AVALANCHE
12,500 MILES • V8 • 4WD • AUTOMATIC
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PRAIRIEHOME
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Drives fine, but makes a whining humming noise
when in all wheel or four wheel drive. Sound
comes from front of the truck. Seems to be louder
when accelerating. What is it ? is it a problem ?
Feb 23, 2009 at 1:00 PM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.
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