Slowpar? Lol mine's strong and true with 220k. I had an 03 with 290k I just sold, and now have an 08 with 210k. Not 1 issue with the trans. The 06 and 08 are stock but the 03 was juiced. The only complaint I have with duramax is the lack of space to work on them.
I know plenty of mopar guys. They say that Cummings engine can't be beat, but I have yet to see a tranny paired with it that last. On that note a body, front end, or frame(couldn't resist). Most everyone that I know with diesels is 07 or older. Hate that emissions garbage.

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