Axle Question...

Duallys had the Dana 80 like the Dodge or the old F450 (Superdutys).
I think you might just be better off swapping the axles. It's harder for us around here just due to the amount of rust we get on everything. Look for a tag on the the diff cover & look for 3.73 or 4.10 somewhere on it. If you can't find the tag just drive it, what are the RPMs in 4th gear (OD) going 55mph? A set of 3.73 will usually run 1600rpm or so. A set of 4.10s will run about 1900rpm or so.

that diff isnt a dropout pumpkin,it would take a guy that knows rearends about 4-5 hrs to pull the old one and install and set tollerences,thats if you understand what you are doing....

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Only tools needed for that are 1-2 extra guys, torches, impact wrench, 6 pack, jack, jack stands, spare axle & a few hours.

can swap the 2wd for free...

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Go for it, it will help out over the one wheel wonder.