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Discussion Starter · #1 · (Edited)
2 month old 2021 3500HD diesel, 2,700 miles. High Country, Z71 package, camper package, snow plow package (and all the other non-powertrain packages). I have a loud squeak coming from the left rear of the truck when driven over bumpy streets. If I drive over a speed bump with both rear tires on the bump at the same time it doesn’t happen, if I angle the truck to the right and let the left tire go over first the left will squeak every time. Any thoughts on this? Dealer re-torqued the U-Bolts per a TSB with no positive results, I was skeptical when they thought it would correct this.
Also, today I had around 1,500 lbs. on and noticed while I was unloading and kneeling on the tailgate that the rear leaf springs have a groan noise coming from one or both. Maybe bushings or shocks? I have a 2006 2500HD Duramax crew cab that I bought new, has 220,000 on it now, I am familiar with the rear spring squeaks that can occur when the trucks age but this noise is different and not expected on a new truck.
Replacement intermediate steering shaft on order as well. This is strictly an on-road truck.
Recently I backed the truck out of a driveway onto a street, as soon as the wheels were straight the engine died. Started right up but..... Only did it that one time was not low on fuel.
I’m happy with the truck overall but even with low miles we seem to be headed towards more time in the shop.
Thank you for any thoughts you have on these issues!
 

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Based on the symptoms that you have described, I would look toward the left rear shock?
 

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Try wetting your rear springs well with water and drive it to see if the noise goes away. Inhave this noise often on the 4500 and actually spray them with a product called Woolwax. Makes the leaves move easier.
 

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Discussion Starter · #4 ·
Update. 3 days after my original post both rear leaf springs are squeaking loudly. Nothing has changed on how I use the truck and haven't hauled anything really heavy in the bed. For sure the truck didn't make this noise until this week. I've owned this $80K truck for 57 days..............
 

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Where do you live? Im curious if maybe the ambient air temps are effecting your bushings. I would personally try to lube them up - maybe blast WD40 between every leaf pack as best you can and then again on the bushings. Soak it up and see if it helps at all
 

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Discussion Starter · #6 ·
So, with respect to the creaking noise from the rear springs it seems that a TSB was issued on Aug. 5 pertaining to this. Title is "Squeak, Grind or Clunking Noise from Rear Leaf Springs"
Our truck was built on May 19 and this TSB was out on Aug. 5 so I'm not the only owner with this issue. They aren't going to replace the spring pack but authorize new spring pads. Good thought but the pads are on back order.
The steering shaft replacement went well.
My original concern about the "chirp-squeak" from the left rear is as bad as ever. I can hear it over the creaking noise of the springs.
I will keep you posted.
 

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TechLink just posted the info on the new spring pads for the '15 to '21 trucks
 

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Update. 3 days after my original post both rear leaf springs are squeaking loudly. Nothing has changed on how I use the truck and haven't hauled anything really heavy in the bed. For sure the truck didn't make this noise until this week. I've owned this $80K truck for 57 days..............
Good Morning, This is my first post and I'm new to owning a diesel pickup. I also have a 2021 2500HD Crew. I have roughly 9800 miles and about 1,000 miles ago I started to experience the same under bed sounds. A trip to the dealer and they informed me of the TSB on this squeaking problem. Each time the truck is going in or out of a driveway and flexing, tit sounds like the spare tire was going to fall out . ( I actually checked that first) Dealer told me they ordered these spring "pads" but they are on back order. This problem only started after I pulled a 11,000 lb boat / trailer from NH to Fl. We did hit some very bad joints in the road at bridges meeting road surface with everything bouncing up and down heavily.
Can anyone else help with comments on this 2021 truck problem?
Thanks,
 

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2 month old 2021 3500HD diesel, 2,700 miles. High Country, Z71 package, camper package, snow plow package (and all the other non-powertrain packages). I have a loud squeak coming from the left rear of the truck when driven over bumpy streets. If I drive over a speed bump with both rear tires on the bump at the same time it doesn’t happen, if I angle the truck to the right and let the left tire go over first the left will squeak every time. Any thoughts on this? Dealer re-torqued the U-Bolts per a TSB with no positive results, I was skeptical when they thought it would correct this.
Also, today I had around 1,500 lbs. on and noticed while I was unloading and kneeling on the tailgate that the rear leaf springs have a groan noise coming from one or both. Maybe bushings or shocks? I have a 2006 2500HD Duramax crew cab that I bought new, has 220,000 on it now, I am familiar with the rear spring squeaks that can occur when the trucks age but this noise is different and not expected on a new truck.
Replacement intermediate steering shaft on order as well. This is strictly an on-road truck.
Recently I backed the truck out of a driveway onto a street, as soon as the wheels were straight the engine died. Started right up but..... Only did it that one time was not low on fuel.
I’m happy with the truck overall but even with low miles we seem to be headed towards more time in the shop.
Thank you for any thoughts you have on these issues!
I had the same problem on my 2021 K3500. After doing all the BS the dealership recommended (shocks, spring pads, drive shaft yoke lubrication), at my cost of course. I found an article that addressed the issue. At the factory, the rear suspension was torqued while the suspension was relaxed. Therefore, the suspension needed to be relaxed and re-torqued loaded. A mechanic friend of mine was able to hang the truck on a lift loosen everything. While the suspension was relaxed, he used fluid film (wool wax) to lubricate the springs and suspension parts. Afterwards, we lowered the truck to “ride height” and re-torqued everything. Since the “fix” I’ve driven 20,000 miles and everything has remained quiet. I speculate eventually I may have to lubricate everything again. Hope this helps.
 
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