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..

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