Question about 1999 Chevrolet Silverado 1500

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2001 silverado thumps when going 40 to 50 mph

When i drive on the highway at 40 or 50 mph i feel a thumping noise coming from underneath as i take my foot of the accelerator it stops but if i slow down and try to go again at 40 or 50 mph it starts all over

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Maybe check for loose u-joints, transmission mount, or carrier bearing if you have a two piece driveshaft.

Posted on Dec 21, 2008

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There's thumping noise coming from the engine I can feel it periodically. It thumps whether I'm on the highway or letting it idle. I have a 2005 4x4 ranger


could be a loose engine mount but there are a few things it could be so some one would need to hear it for a better diagnosis

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Oct 22, 2012 | 2002 Toyota Corolla

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I need to know how to get to the blend door in the heater area of my '92 chevy c1500. I was told that is what makes a thumping noise when the key is on or off.


this is some what normal, as long as it just once that you hear the noise (ie. you turn the truck on and thump, turn the truck of and thump) the doors operate off of vacuum lines in the engine. When you shut the engine off the vacuum goes away and *thump* the blend door snaps back to its normal resting position. then when you turn the truck on the vacuum then comes back and *thump* the door snaps back to its adjusted place.

If you feel that this is not what is going on, this diagnostic technique can help eliminate this condition
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if you didn't get a thumping noise that is good it just means that the blend door is set to the hot side normally open.
.

Apr 18, 2011 | 1999 Chevrolet Silverado 1500

1 Answer

I have 2004 Ford Explorer with a thumping feel and sound. When I drive over 50 mph and let it coast, the thumping starts. I feels as if it's coming from the back but not sure. The check engine light is...


if your lucky, its just a u-joint going out.

try replacing the u-joint which connects the driveshaft to the rear end(differrential), and if that does not solve it, then have your differrential checked out (a bad differential usually wont get all the power to the wheels that its supposed to) or just have it replaced, possibly with a junked differrential form a wrecked vehicle with low miles.

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That's a hub bearing. Replace the one that's doing it. I'm assuming this 'roar' is coming from the front, NOT the rear.

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this noise sounds like your right cv axle. wou might want to have that checked out, they can do great damage if broken while

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