‘19 Sierra Denali suspension noise

[TomCorey]

Anybody experiencing clunking coming from the rear bed area or rear suspension? Sounds like the bed is clunking around when rocking back and forth taking slow turns or going over bumps at an angle. 

[SeTex]

I'm having the same issue with mine. 

[88junior]

My AT4 has the same issue. Not all the time but intermittently. I've looked around under the rear end but can't seem to find anything obvious. I've seen other posts about the same issue on here but no solution that I know of.

[GuyyuG]

My ‘19 SLT is doing the same, as another user on here described sounds like “ a bowling ball rolling around the bed”. Looks like this issue is more wide spread than I thought. 

[kpanza]

Yeah, this is a widespread issue.  I suspected it was due to my woefully under-torqued leaf spring u-bolts (lucky if they were at 40ft-lbs of torque!), but even after tightening them to the recommended 85ft lbs, didn't change the clunking noise.  Mine has been doing since Day 1, but my truck spent 65 days in service for a transmission problem, so I am leery about letting it sit there at dealership any longer.  I've checked shocks, u-bolts, spare tire, etc, nothing obvious at this point.  But every time leaves load and unload (backing out of driveway, pulling in, over speedbumps, etc, get the bowling ball in bed noise).  So embarassing when passengers ask what is that noise?  I just turn up the radio...

 

Guys have gotten the leaf springs replaced, new isolators in between leaves, etc, still not sure it solved it. 

 

Just so we can compare trims, etc, please state your exact truck specs:  Mine is a '20 SLT 6.2L 4x4 Crew, with Standard bed and NHT

Edited July 16, 2020 by kpanza

[Mikedfw]

Mine does this, but fairly rarely. It isnt frequent enough to really bother me, but wish I knew what it was.

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[ScX31]

Mine does it, dealer has ordered new shims, we’ll see if it goes away.  Mostly notice in reverse but sometimes going over bumps. 
 

19 Sierra x31 with 2” spacer. 

[silverado990]

My truck was doing same thing, something to do with passenger shock not tightened or something.

[robstitzer]

There's a good four page thread on this. If you search, it will show the bulletin that GM dealers have available to them.

[lapoolboy]

TSB # 19-NA-129

 

I can confirm it solves the noise issue and the truck is finally noise-free.

[TomCorey]

Yep. Just got mine done today too. Noise is gone. Hopefully it lasts 

Edited August 11, 2020 by TomCorey