The other problem you run into is the transmission. The cat that Ford uses in the F650/F750's are governed at lower rpm. You would need to use a much different transmission than the ones currently offered in the F350. This engine also weighs a lot more and takes up a lot more space. There's no way Ford would put the money into a joint venture with cat when they already have a contract with Navistar. It isn't a good economic choice to offer more than 1 diesel in pickups when they already offer the highest rated diesel in a pickup now.

Just because an engine is successful in commercial applications doesn't mean it's the best choice for a light duty truck. Although noone would argue that cat's are great diesel engines, they are not the best option for a pickup. In order to work successfully in a pickup they need to reach higher rpm to work well with the torqshift or 6 speed transmissions. The Power Stroke is the best option in this case because it develops torque early in the torque curve, increasing steadily to the peak at 2000 rpm, and MAINTAINING a high level of torque all the way up to 3300 rpm, unlike the commercial engines that peak in torque very early and drop off at much lower rpm. Sure, you could retune the engines, but does that really make sense?

bassdude, what on earth do you want to tow that you can't already tow with a Power Stroke?