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Posted (edited)

Anyone know what this noise is? It's very intermittent. Seems to do it most often between 40 and 50 MPH cruising with maybe a slight up hill. Never does it on coast or heavy acceleration. Very hard to tell where it's coming from. 

20190521_191545_001.mp4

 

2014 Sierra Denali 1500

Crewcab, 5'8" bed

6.2 Litter

3.42 axle ratio

about 118,000 miles

Edited by Chuck B.
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I cant hear what you are describing. Do your rpm's normally jump around like that?

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On 5/24/2019 at 7:07 AM, silveradosid said:

info on what type of truck and year

Should have started with that.

It's a 2014 Sierra Denali 1500 with the 6.2. Crew cab, 5'8" bed, about 118,000 miles. 

 

On 5/23/2019 at 7:16 PM, 508gm1 said:

I cant hear what you are describing. Do your rpm's normally jump around like that?

The noise I'm hearing can be heard at 2 and 14 seconds in the video. 

 

I noticed the tach bouncing but was sure if that was normal for this truck or not. I'm climbing a slight hill in the video and the bouncing doesn't seem to be tied to the noise but it could be related. 

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I also put chassis ears on the truck and you can definitely hear the noise in the T-case and rear axle. It sounds different but the intensity is about even.

I did not hear the noise in the frame, exhaust, or front axle and it was hard to tell if I heard it in the transmission. 

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