Question about 1999 GMC Safari

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1999 GMC SAFARI VAN REAR END HUMMING

THE REAR END OF MY VAN IS MAKING A LOUD HUMMING NOISE. AT FIRST I THOUGHT IT WAS THE TIRES..BUT WE CHANGED THE TIRES. WE TOPPED UP THE DIFFERENTIAL FLUID, BUT THE NOISE IS STILL THERE.

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  • Anonymous Feb 13, 2009

    2001 gmc 1500 put new unit in a have a roar when letting off of gas

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This rear end needs to be replace or re-built


































This rear end needs to be replaced or re-built. The gears and or bearings are worn/shot. May be able to get a complete rear end from a Junk yard for much less, one in good condition. Good Luck






Posted on Dec 10, 2008

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Posted on Jan 02, 2017

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Humming


Chances are it's the tires rather than the engine.
Does the hum diminish if you back off the accelerator? If yes, then look at rear axle pinion bearing. If no, then feel across the tires. They should be smooth across. If they're rough, they will make a loud howling noise.


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The humming noise and the battery light being on is probably due to a worn out alternator. You can get the alternator checked for free at most Advance or Auto Zone parts Stores.

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