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Clunky sounds in the Chevy Silverado often signal suspension issues. Specifically, a Chevrolet TSB covering Silverado models from 2014-2018 mentions clunking or squeaking noises from the back of the truck due to debris in the leaf springs or loose U-bolts. The TSB also identifies a faulty spring shackle that may need replacement. To address loose U-bolts and worn leaf springs, dealerships are instructed to tighten the bolts and add new rear leaf spring inserts. To check if your Silverado is impacted by this, reach out to a nearby dealer with the vehicle's VIN.
In a 2017 Chevy Silverado, if you hear a clunky sound, it's likely due to a wheel bearing starting to go bad.