I don't see where the 6.0 clutch is any better than the 7.3 clutch anyhow ? maybe I'm missing something, but mine works great, and I'm VERY pleased with it.
in the morning, after sitting all night, the fan will run for a bit, until the oil "Throws" out of the clutch, you can rev it up to about 1400 RPM and hear it,
(takes a bit longer if it's real cold, because the oil is also cold), but then it doesn't pull enough air to put in your hat. I can see where in the really cold country
it could be a problem, and if I lived in Michigan or someplace cold, I'd probably take the fan off for the winter if I wasn't going to tow anything.