As far as I can see this should be a bolt together deal.
The front Dana 60 should bolt right up to your stock front springs (or you can swap in the 1 ton springs).
As far as the rear axle, you will need to change the front/rear spring hangers. This is a bolt in deal. Just grind off the rivets on the old spring hangers (if you don't have torches) and bolt the 1 ton hangers on using Grade 8 hardware.
Just keep in mind when this project is done as far as the DOT is concerned you still have a 1/2 ton truck.