I was thinking the same thing as SSR.
Your 2011 with 311,000 miles is just getting broken in! Both of mine ('02 3500 & '03 2500HD) have more than twice that much each on the original engines & trans. The '03 did get a rear end rebuild & a set of trick Fleece Patriot cupless heads though. After the first 100K each all those miles are pulling the car trailers to boot.
God Bless
Bill
https://www.jalopyjournal.com/forum/...closed.614419/
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