the problem resulted from soft plastic spring seats that allowed bits of gravel to become embedded between the seat and the spring. The bits pierced the spring coating, and salt corroded the spring, causing a fatigue initiation site. The "cure" was to replace the plastic spring seats with heavily galvanized steel ones. This both reduces the chance of debris burrowing through the coating and provides some galvanic protection to the spring in case the coating is breached.
I have no idea if this works, but the 8 year, 100,000 mile spring warranty by GM does not cover MY 2007 and beyond.
posted by 24.165.160...
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