A sound my truck makes...

I am boggled. Usually I can pin point any problem going on with my truck, but this one I just can't figure out.
Neither can several mechanics I've talked to. (They've all given me completely different answers)
Google doesn't help much either. Anyone out there been a mechanic for years?

The problem is ONLY when I am at a stop, and release my brake pedal to switch to gas, there is a "DING" or "GONG" sound that occurs.
It doesn't happen when I have just started the truck, only once it's been running.

Also it only happens when I release the brake pedal from a complete stop. (as opposed to slowing down without a stopping)

Any suggestions would be great.
Thanks.

Don't come to a complete stop. Sorry, that is all I have to offer.

I have a couple of idea's but it depends on which side or which end of the vehicle the noise is coming from.

What year/make/model? Is it a mechanical or electronic noise?

U Joint Or Transmission Mount Or Motor Mount

so the vehicle shuts off at a stop or just makes the noise?

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Originally Posted by matt018

so the vehicle shuts off at a stop or just makes the noise?

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Just makes the noise.

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Originally Posted by Kris Kringle

U Joint Or Transmission Mount Or Motor Mount

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U joint is the only thing you said that another mechanic also said.

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Originally Posted by Mechanic688

I have a couple of idea's but it depends on which side or which end of the vehicle the noise is coming from.

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I have crank windows so my driver side is usually the only one down. Hard to say which side it's from. It is a very clear sound though.

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Originally Posted by IdahoScrapper

What year/make/model? Is it a mechanical or electronic noise?

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2007 Chevy silverado 1/2 ton
110k miles

Ya, but a u joint has a pretty distinct clicking sound starting out. My other guesses were motor mount, or one of the front end components. That's why I asked about which end the noise is coming from,,

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Originally Posted by Kris Kringle

U Joint Or Transmission Mount Or Motor Mount

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These would be my guess too^

I would say motor mount

*cough* Shoulda bought a Ford *cough*

Kidding, kidding :)

My scrappin buddy has the same sound on his Chevy. Only when he lets off his brake from a complete stop. Mechanics say it could be either the u-joint, or a motor mount. We've got our money on a u-joint.

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Mechanics say it could be either the u-joint,

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Once you have heard a u joint clicking, they have a sound like nothing else. When you take your foot off the brake and start to accelerate you are shifting the truck weight from the front to the rear, so it might be a front end part getting some slop. I'm thinking maybe a control arm?? Can't think; too much sun today(shhhh don't scare it away). lol

So many questions to ask.

2wd or 4wd? If 4wd does it happen when the 4wd is engaged? Does the sound happen when you let off the brake, or when you step on the foot fuel, or in the transition time from one pedal to the next? Mechanic has a good question on which end it is coming from, and like he said the u-joint would make a distinctive sound.

Now if it is more of the "gong" sound I would opinion that it is a u-joint or other problem putting slack on the drive line, worn splines, t-case chain if 4wd, so on. Pretty easy check is to crawl under and twist the drive line with your hands and see if there is slop in it. Of course do this while the vehicle is parked! :D

If the sound is a "ding" I would opinion that it is a front end part that is loose and "dinging" when weight transfer occurs. That would be happening when you step on the fuel just like the slack in the driveshaft would.

If it happens when you let off the brake pedal, I would say "Pull them front wheels and take a look at the calipers, rotors and wheel bearings." While your in the wheel well, shake some of the front end parts and see if something is loose.

The wifey just got home so now I have to go work on a '96 chevy. How fun!

Fairly new Chevy with only 110 thousand on it, should not be making noises already, Strange,,,