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I've spent some time looking at the Cummins, Duramax, and Powerstroke forums. First of all, I think most people are not having trouble and are happy with their respective purchase. When you get a few hundred or even a few thousand people complaining about a product where there are hundreds of thousands of satisfied customers~ atleast not posting complaints, that's pretty low wear numbers if you ask me.
Seems more people who post about complaints are coming from the Powerstroke sites, namely the 6.0 The 7.3 seems to have a very good reputation. On the Duramax sites I've seen, most people are happy with their truck, and especially the 3rd gen LBZ with the six speed Allison. Seems fuel milage is the biggest complaint with the Duramax guys. The Allison seems to be a great tranny, but the cost of repair is sky high. The Cummins guys are very happy ' usually ' with their straight six, but the rest of the truck falls short sometimes. The Cummins auto tranny is about as good as the Allison according to some tranny guru's, and a lot cheaper to fix when it breaks.
There is a loyal following with each of the big three diesels. It depends a lot I think how well matched the truck is to the guys needs. I personally prefer a non V-8 diesel such as the Cummins. If I needed a diesel truck, I would drive all three and make a decision based on each of their merits.