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4.7L with head gasket problems???? WOW, that's a new one. I put 40K on the dakota QC I had, and it was a solid engine. You maybe had a freak. I don't think anyone ever claimed the 3.7L was a power monster. It will also be interesting to see how they fair service wise in your fleet. The Dakota QC has to weigh 4400#, that's quite a bit of heft for the little six. Good luck.
NoJeffGordon, sorry to hear about your woes with the Truck. It sucks cuz youre committed to it now. Wish I had some better news. V6 pulling 4000lbs is not a good power to weight ratio.