Chevy AV with Loud hum in 4WD


Asked by Jan 15, 2016 at 07:47 PM about the 2003 Chevrolet Avalanche 1500 4WD

Question type: Maintenance & Repair

Last winter my 03 Avalanche started making a loud
hum that increased as I accelerated. It only
happens when I have it in 4 Auto or 4WD. The
strange thing is when I let go of the gas and it drops
to about 1000 rpm the noise stops. Any Chevy
experts out there that can tell me what I'm dealing

1 Answer


I have the same problem on 2wheel drive mode on my 2003 Avalanche. I brought it to a mechanic for a different problem, engine shuts down while driving on a highway. After running diagnostics, he found that the fuel pump is bad. During removal of the fuel tank, he noticed the universal joint is worn and he also replaced it. He also checked the gearbox/ front differential and found that it was almost empty. I did not even tell him that I am experiencing some humming and vibration at a speed of 65 to 70 mph on the highway and when you let go of the accelerator it somewhat disappear. It's more pronounced between 65 to 70mph. Have your mechanic check the universal joint connections and oil level of front and rear differential. I feel very lucky to discover this honest mechanic who discovered my annoying problem even without asking for it. Try to get this done as soon as possible before it generates another costly repair. good luck..

Your Answer

Add photo

Related Questions

Search Chevrolet Avalanche Questions

Chevrolet Avalanche Experts

#1 Tom Demyan
Tom Demyan
Reputation 280
#2 David Scott
David Scott
Reputation 160
#3 Oscar Leon
Oscar Leon
Reputation 150
View All

Related Models For Sale

Used Chevrolet Silverado 1500"
2,470 Great Deals out of 144,754 listings starting at $1,995
Used Chevrolet Tahoe"
1,147 Great Deals out of 36,615 listings starting at $1,995
Used Ford F-150"
3,253 Great Deals out of 217,198 listings starting at $1,000
Used Cadillac Escalade EXT"
37 Great Deals out of 790 listings starting at $5,933
Used GMC Sierra 1500"
1,047 Great Deals out of 56,521 listings starting at $2,300
Used Dodge Ram 1500"
525 Great Deals out of 13,942 listings starting at $995
Used Cadillac Escalade"
384 Great Deals out of 11,287 listings starting at $2,999
Used Toyota Tundra"
629 Great Deals out of 26,721 listings starting at $2,500
Used Chevrolet Suburban"
674 Great Deals out of 24,303 listings starting at $1,985
Used Chevrolet Camaro"
826 Great Deals out of 39,074 listings starting at $2,650
Used Chevrolet Colorado"
329 Great Deals out of 17,759 listings starting at $2,495
Used Toyota Tacoma"
640 Great Deals out of 30,628 listings starting at $2,850
Used GMC Yukon"
559 Great Deals out of 14,733 listings starting at $1,500

Used Cars For Sale

2013 Chevrolet Avalanche For Sale
24 Great Deals out of 450 listings starting at $17,986
2012 Chevrolet Avalanche For Sale
20 Great Deals out of 356 listings starting at $15,999
2011 Chevrolet Avalanche For Sale
36 Great Deals out of 611 listings starting at $13,495
2010 Chevrolet Avalanche For Sale
17 Great Deals out of 383 listings starting at $11,995
2009 Chevrolet Avalanche For Sale
9 Great Deals out of 344 listings starting at $11,788