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Hey everyone. Had the truck in the shop for a misfire #8 as well as 2 tranny codes that repeat every so often. The last few days (when the misfire code showed) I noticed an odd whistling sound coming from the truck. The GM tech today indicated that he heard the sound as well and mentioned that this is related to imminent camshaft failure. I've never heard such a thing before. So, has anyone else had a cam replaced on these trucks yet. I have 230,000km/140,000 miles on my 6.2. Thanks.

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