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Dana 60 from a Ford is what you will be looking for.
From I believe 86-97 F350. Get all the brackets that bolt to the cross member (under the oil pan) and the brackets between spring and axel and springs also. Do not use the F250 springs. They are way stiffer then the F350. I tried it and it was like riding a lumber wagon, you feel every pebble in the road. I used the F350 springs from the donor truck that I got everything else from. The truck was a 460, single cab truck and mine is a 7.3 diesel crew cab and the springs work good.