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Knocking sound from rear end 21 sierra 1500


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Just purchased a 2021 sierra 1500 Duramax. I've owned it about 5 weeks now and it was smooth and silent up until a few days ago. I'm now getting a knock/clunk coming from the rear end. It happens when I'm driving slowly going over bumps or when turning. I did some research on this forum and narrowed it down to defective leaf springs or it's the DEF sloshing around and making noise. I jumped up and down in the bed like a crazy person. The leaf springs were silent but I did hear the DEF tank although it wasn't the same sound. Could it be anything else? I'm taking it to the dealer next week but as we all know, more often than not they are absolutely horrible at diagnosing strange noises so I'd like to make some suggestions for them.

 

 

IMG_20220513_065351_1.jpg

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Posted (edited)

Leaf springs and common. Shake the rear of the bed hard side to side and you'll hear it. Many have went to the dealer and ranges from spraying lube, greasing between leafs and even changing spring packs with only temporary fixes. Truck will sit at the dealer for days and most dealers say "it's normal". BS. That's a bad GM design. I had the same on my '19 RST and '22 LTZ. The only thing that works and the fix is called spring things. I just installed them on my '22. Thousands of GM truck owners use them and is the only product the company makes and for GM leaf springs. Easy install and works amazing and quiet as can be. I didn't even remove the wheels. Spring-things.com

Edited by mafd2
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1 hour ago, mafd2 said:

Leaf springs and common. Shake the rear of the bed hard side to side and you'll hear it. Many have went to the dealer and ranges from spraying lube, greasing between leafs and even changing spring packs with only temporary fixes. Truck will sit at the dealer for days and most dealers say "it's normal". BS. That's a bad GM design. I had the same on my '19 RST and '22 LTZ. The only thing that works and the fix is called spring things. I just installed them on my '22. Thousands of GM truck owners use them and is the only product the company makes and for GM leaf springs. Easy install and works amazing and quiet as can be. I didn't even remove the wheels. Spring-things.com

Thank you! I won't bother with the dealer then. I'll order the spring things 

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  • 2 weeks later...
On 5/24/2022 at 6:38 AM, Digger87 said:

Just purchased a 2021 sierra 1500 Duramax. I've owned it about 5 weeks now and it was smooth and silent up until a few days ago. I'm now getting a knock/clunk coming from the rear end. It happens when I'm driving slowly going over bumps or when turning. I did some research on this forum and narrowed it down to defective leaf springs or it's the DEF sloshing around and making noise. I jumped up and down in the bed like a crazy person. The leaf springs were silent but I did hear the DEF tank although it wasn't the same sound. Could it be anything else? I'm taking it to the dealer next week but as we all know, more often than not they are absolutely horrible at diagnosing strange noises so I'd like to make some suggestions for them.

 

 

IMG_20220513_065351_1.jpg

Hello.  I went through this with my 2021 Trail boss.  It is the rancho shocks.  Get them replaced under warranty and the problem will be gone.  A way to confirm this is to stand in the rear bumper step at each corner and bunce.  You will hear it loud and clear.   In fact I started to hear it in the front as well, and just had the passenger side shock replaced.  Solid and quiet now.  

 

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On 6/1/2022 at 11:49 AM, mdviva718 said:

Hello.  I went through this with my 2021 Trail boss.  It is the rancho shocks.  Get them replaced under warranty and the problem will be gone.  A way to confirm this is to stand in the rear bumper step at each corner and bunce.  You will hear it loud and clear.   In fact I started to hear it in the front as well, and just had the passenger side shock replaced.  Solid and quiet now.  

 

Thank you for the suggestion but I believe the trail boss and x31 have different shocks (I could be wrong). I installed the spring things and the noise is gone so it was the leaf springs

 

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  • 3 weeks later...

I have the same noise problem with my 2020 1500 Duramax 4WD. Took it to the dealer they said they can't find anything wrong. Took it back and had the service manager drive it. He said it is "bed shift". They tightened the four bolts

holding the bed to the frame. He said there is no fix for it. Problem is still there. Truck is still under warranty. Has anyone heard of Bed Shift?  I think it's BS.

 

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3 minutes ago, Jack Thaxton said:

I have the same noise problem with my 2020 1500 Duramax 4WD. Took it to the dealer they said they can't find anything wrong. Took it back and had the service manager drive it. He said it is "bed shift". They tightened the four bolts

holding the bed to the frame. He said there is no fix for it. Problem is still there. Truck is still under warranty. Has anyone heard of Bed Shift?  I think it's BS.

 

Spring Things man. Quit wasting time at the dealer.

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