I haven't had any problems, but I've read on other forums about this problem. I read it here:
6.7L Engine and Transmissions (2007.5+) - TDR Roundtable
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2007 Ram 2500, 4X4, 6.7 CTD, 6 speed auto.....with a 6yr/100K Mile warranty.....yeah, just a little scared of all the new stuff!