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Popping leaf springs

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Hey all, so I had my 2020 Denali HD for a year when I heard noise in the undercarriage. Took it to the dealer, they told me my leaf springs were popping and they did not know why. They replaced them under warranty and I had no noise for about a year. Recently I took the truck back in because the noise was back, they told me the shackles on the axel hadn’t been torqued. They replaced the shackles but the truck was still making noise. If anything it’s worse since they replaced the shackles. The dealer has passed the problem onto GM who currently has no solution for the problem. They told me I was not the only one with the issue and it was a problem with the HD models. Is there anyone out there that is having this problem? Have you been told anything different or have more information? My 80k truck should not sound like it’s falling apart!!!!!!

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New Inserts Address Rear Leaf Spring Sounds

August 31, 2021

A squeak or clunk sound from the rear leaf springs may be heard on some 2015-2021 Silverado 2500HD/3500HD and Sierra 2500HD/3500HD models. The sound may be caused by the spring insert interacting with the leaf spring. Keep in mind that some noise is a normal characteristic of leaf spring suspensions when travelling over rough roads or bumps.

To help reduce excessive leaf spring noise, a new insert with a graining pattern is available. (Fig. 23) Replace the rear leaf spring inserts using a plastic trim tool or plastic wedge in between the leaf springs.


F23-spring-1.pngFig. 23


TIP: New spring tip inserts have a break-in period of up to 1,000 miles (1,610 km), so some noise can be expected after the new inserts are installed. Also, these inserts are designed to work without any lubricant.

Follow the service procedure in the appropropriate Service Information to install the new inserts. The bolt that secures the clip to the spring alignment bracket must be removed to relieve spring tension.

Do not chip the painted coating on the springs when performing the repair. A rag should be placed in the area where contact with the spring may occur. (Fig. 24, #2)

Use a plastic trim tool, plastic wedge or equivalent to separate the rear springs. (Fig. 24, #3)


F24-spring-2.pngFig. 24


Clean any dirt or grease from between the leaf spring using a rag and degreaser before replacing the inserts for the left and right side springs. (Fig. 25)


F25-spring-3.pngFig. 25


There is no need to adhere or modify the inserts as removal of the spring clip allows for proper access.

For additional information and part numbers, refer to Bulletin #21-NA-138.


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