Question about 2003 Chevrolet Avalanche

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Humming noise A humming noies that sound like a tire problem. Can be heard from inside no matter where one sits. Sounds like it is comming from the front tires. I have new tires and all new bearing front and rear includings rear-end..

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My 03' avalanche was making the same huming sound. After checking everything that could possibly be making this noise from tires to wheel bearings to brake shoes draging and four different pro garages giving me four different answers, I finally checked the rear differntial only to discover fluid slowly seaping out of it. I'm told more than once' that this is an ongoing problem with some rear ends on these model trucks but chevy or GM will not take any responsabilty or acknolage any problems exist. This little non responsible action finally ended up costing me over $2300.00 out of pocket... SO' have the rear axle bearings checked and serviced asap before this happens to you...

Posted on Nov 05, 2010

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Posted on Jan 02, 2017

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Front end humming


noise is a bad sign, best is to have mechanic find it
some noises can be very very dangerous to driver for sure
the testing person,
makes noise only moving, in all gears
does it make noise moving in Neutral, coasting,
does doing that, and carefully stalling engine coasting with noise stop the noise.... yes, find a safe place to do that.
i use a steelman electronic stethoscope to find most noises.
it has a clamp on microphone, its like a $35 tools, way less that taking the whole car apart.
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the FSM covers this test in 1 page.
as does alldata.com ,....

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