I have only heard good things about the early Cummins diesels. I don't know much about the autto tranny, I have heard it was not so hot. What do you want the truck for? Something to work hard for you? A DD? A toy? And are you one of these guys that sees the truck as sort of an extension of your personality? If so....don't settle for something you don't really want, if you just want a good truck however, you've found it, but with the understanding that auto tranny might not be so hot. Probably could easily build it up or swap in a getrag 360 or NV 4500 if that becomes an issue. If the price is right and you really have to have a Ford, buy a nice body F-series, maybe a C4C victim 3/4 or 1 ton and swap all the Cummins goodies over. That swap gets expensive only when you have to buy the Ford-Cummins or Destroked adapters and/or mounts. If you have a complete vehicle it is just an engine swap according to Midnight Rider who's actually done said swap, and what he says makes sense. In that case I would definitely get a better transmission though. Either a Dodge diesel manual or a Brian's E4OD if you wanted the auto, or a T18/19 backed by a brownie. Then again getting the Ford tranny to fit can get expensive. Ha, we can all spend YOUR money. In reality though it's simple, if you like that truck, buy it, you may be surprised how much you like the old Dodge and if not you have something you can easily sell or use in a Ford. Those 12V Cummins are popular and in high demand always. They are efficient, nothing to write home about in stock trim but can be easily and cheaply modd'ed to run rings around even a turbo IDI or even a PSD depending on how far you want to go.