Joe, I'm thinking Jeremy is right. Your pcm on the truck probably won't work with the new ecm on Shad's Cummins, most likely different programming or some sort of thing. Taking his pcm, ecm, engine and harness might work but as Jeremy said other sensors on your truck may not work, i.e, wheel speed in the rear axle, tranny senors if any and then there is the abs. Depending on the year I'm thinking his could be a common rail, seems like they did that thing again with the half year model. 2004 with injection pump and injectors, 2004.5 with cp3 and common rail, not 100% sure about that though but thinking it's correct. You could probably get with some folks like Geno's garage or Sheid diesel and start the question asking. These folks are pretty deep into Cummins and Dodge and would most likely be able to give you a better answer.
http://www.scheiddiesel.com/user_pages/home_0.shtml?page=Homehttp://www.genosgarage.com/