Advice Needed: What to do with my '96 B3500?

Having owned and driven quite a few the mileage will drop plenty from the 10-12 to 7 to 8 doing so.

Did your van have the single big back door like this one has or did you have the two smaller doors. I had a 97 3/4 ton that was a 5.2 and a 727 transmission. Not an Overdrive from the factory.