I think a big reason chrysler didn't use a smaller diesel instead of the v6 gas is that chrysler is dropping their 5 or 6 current v6s for just the 3.6 which will make that engine very cheap per unit. Also, consider the programming needed for a new diesel where they could just borrow from the durango and jeep. Lastly, there is a HUGE following of big diesel trucks for "macho" guys, to them a smaller engine isn't macho, I doubt they would have sold enough to make it worth it.
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