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Is there a difference between 2nd gen and 3rd gen blocks
3rd Gen Ram Tech2002-2008 Rams: This section is for TECHNICAL discussions only, that involve the 2002 through 2008 Rams Rams. For any non-tech discussions, please direct your attention to the "General discussion/NON-tech" sub sections.
I'm assuming when you say common rail, you are running a CTD. You will be way better off if you post this question in the Diesel forum, all by itself. Lot of guys there, you'll get an educated reply fairly fast.