2003 Chevy Avalanche 4 wheel drive whining

2003 CHEVROLET AVALANCHE
40,000 MILES • V8 • 4WD • AUTOMATIC
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MLULAY
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my 4wd has developed some sort of whining problem. ive changed out the gear oil and found no signs of wear or burning. as soon as the 4wd is turned off it disappears. all the driveline coponents are intact and in good working order.

please help!
Dec 10, 2009 at 6:50 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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