I have 2 Crew Dually 2WDs, an '81 (the nicer one) and an '82.
I started to put the '82 together last spring, got as far as putting a Tommy Lift on it and yanking out the rear axle....and it sits.
Mainly because It was just a bit rustier than I care to mess with.
Right about now I'm not so sure either will ever see the road again, I just have ZERO ambition to even mess with them.
Mark.