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My March 2014 C7 had a new torque tube put in around August 2014 with only 6k miles on it. The issue was due to worn bearings. At 9k the sound returned and I knew it was the torque tube again. GM instructed the dealer not to repair the car again (yet) because the sound did not seem severe enough and they were hesitant to do another tear down. At 12k (2 days ago) I stalled in the center lane of a major highway (quite dangerous), had the car towed to Chevy and the engine was pronounced dead the next day. The cause was metal shavings in the engine and oil filter and a damaged crankshaft sensor and thrust bearing, likely due to excessive crankshaft end play. All of this has been predicted on various forums so clearly there is a design or assembly flaw.
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