Since it has a Chrysler engine, it may have a 727, but since it is 4 wheel drive, I'm betting TH400. Take a picture of the tranny pan and match it up here:
http://www.teufert.net/trans/trannyid.pdf
Along with the other goodies, it has power steering, new battery, and the missing trim and other pieces are fairly easily sourced. How is the body? Have you run a magnet around the fenders, quarter panels, rockers, etc.? Great project!