Has anyone here ever done that swap? My 94 Ram is in rough shape (body, front end, brakes, etc. all need attention). I'm considering picking up an older D series truck and swapping the drivetrain into it. My truck has fairly low mileage and runs like a top still. An earlier truck weighs roughly 600lbs or so less, so I should see some mileage improvement as well. Also pre-1988 vehicles don't need to be smogged in my area, so that's another plus. So I ask, is it worthwhile? Wiring nightmare? Please share your experiences.