2020 chev silverado 2500 hd growling noise during acceleration from somewhere in front

Bruce proko · January 19

i have a 2020 chev silverado 2500 hd with the 6.6 gas and 6 speed transmission, im getting a growling noise coming from which seems to be from the front during acceleration and if i take foot off accelerator the noise quits , does any one have any suggestions on what this could be . i took front drive shaft off and noise was still there , i had replaced rear u joints also .

gemarsh · January 19

Have you checked the gear oil in the front diff? Both my front diff's were low from new.

gemarsh · January 19

https://www.gm-trucks.com/forums/topic/262686-check-your-diffs/

Bruce proko · January 19

14 minutes ago, gemarsh said:

Have you checked the gear oil in the front diff? Both my front diff's were low from new.

yes all oils just changed

nocturnalmotors · October 11

2022 Chev 3500 Gas with AutoTrac 2-Speed Transfer Case 59k mi.

I have a similar noise. Has been to dealer 3 times now and so far they've removed each drive shaft, then test drove and it's still there. They connected both the pico scope and chassis ears and pico didn't show anything. Chassis ears point to transfer case. The transfer case and transmission fluids have no debris. They are reluctant to open the transfer case or transmission without knowing that's where the issues is. When monitoring the torque converter on the scan tool, it is within specs for slip.

Anyone have insight? The noise is at low RPM when you tip into the accelerator and a faint come and go drone when driving on highway. Is getting worse as I drive it.

@MTU Alum

@newdude

Edited October 11 by nocturnalmotors

newdude · October 11

2 hours ago, nocturnalmotors said:

2022 Chev 3500 Gas with AutoTrac 2-Speed Transfer Case 59k mi.

I have a similar noise. Has been to dealer 3 times now and so far they've removed each drive shaft, then test drove and it's still there. They connected both the pico scope and chassis ears and pico didn't show anything. Chassis ears point to transfer case. The transfer case and transmission fluids have no debris. They are reluctant to open the transfer case or transmission without knowing that's where the issues is. When monitoring the torque converter on the scan tool, it is within specs for slip.

Anyone have insight? The noise is at low RPM when you tip into the accelerator and a faint come and go drone when driving on highway. Is getting worse as I drive it.

@MTU Alum

@newdude

Are you hearing this noise in 2HI or AUTO?

nocturnalmotors · October 11

@newdude In 2wd. Thank you for responding.

Edited October 11 by nocturnalmotors

asilverblazer · October 16

On 10/11/2024 at 7:52 AM, nocturnalmotors said:

Is getting worse as I drive it.

Under warranty?

If so, the good news is if its getting worse, you eventually won't have to guess what is making the noise.

I know - not real helpful - but sometimes I have used the approach that if you are reluctant to TRY something and hope it fixes it, it doesn't hurt to wait for the problem to manifest itself in a manner you can more confidently diagnose.

Some might say this is opening yourself up to worse damage - so is tearing open a transmission to find nothing wrong $$$.

nocturnalmotors · October 28

Back at dealer. They are tearing into transfer case.

nocturnalmotors · October 30

Replacing transfer case. Told me they actually ordered one a couple weeks ago? Told me there was a bearing that went out but mentioned water? But still warranty... I have questions... Never drove through more water than puddles in the road.

GMCustomerService · October 30

2 hours ago, nocturnalmotors said:

Replacing transfer case. Told me they actually ordered one a couple weeks ago? Told me there was a bearing that went out but mentioned water? But still warranty... I have questions... Never drove through more water than puddles in the road.

We regret to hear of these concerns you are having with your vehicle and would like to take the time to investigate further. Please send us an email to [email protected]. Be sure to include your Username and Forum name in the subject line with additional details.

nocturnalmotors · November 7

On 10/30/2024 at 2:45 PM, GMCustomerService said:

We regret to hear of these concerns you are having with your vehicle and would like to take the time to investigate further. Please send us an email to [email protected]. Be sure to include your Username and Forum name in the subject line with additional details.

I have a case with GM Customer Service, would this help or same?

nocturnalmotors · November 7

On 10/30/2024 at 12:10 PM, nocturnalmotors said:

Replacing transfer case. Told me they actually ordered one a couple weeks ago? Told me there was a bearing that went out but mentioned water? But still warranty... I have questions... Never drove through more water than puddles in the road.

Replaced transfer case with reman. Leaking out put shaft seal now... Back at dealer.

Noise is same as this video at 1:20

Happens in 2wd, Auto, 4hi..