2002 Chevy Avalanche Noise when all-wheel drive is engaged

2002 CHEVROLET AVALANCHE
44,510 MILES • V8 • 4WD • AUTOMATIC
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TRIWAY99
  • MEMBER
  • 1 POST
Developed noise problem when driving in 4-wheel drive, and driving above 18 mph. At highway speed the noise sound turns into a whining sound (e.g. table saw running), however, as soon as the 4wd is turned off and put into 2 wheel drive, it disappears. It just started happening, I tried parking it in the garage for the weekend, because it was extremely could in Anchorage the last 2 weeks while I was on vacation, but that didn't seem to help.

Samantha
Jan 11, 2010 at 6:06 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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SCOTTY DEE
  • CAR REPAIR CONTRIBUTOR
  • 592 POSTS
Try changing the fluid in the front differential first. Use Mobil One 90/120 synthetic gear lube. I have solved a lot of noise problems that could not be explained by bearings etc. by doing this.
Jan 26, 2010 at 12:15 PM
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