I think you should get a trans that is for 4x4 already , if you get it from a truck get it with the transfer case attached if your truck has the stock one its a np203 full time unless someone changed it or added a kit to make it part time in wich case the axles have some small lock outs.
if you get a trans from a truck with a np208-241-205 it will not work with a np203 because the tailshaft is np203 specific , if it is full time and you don't have a use for it I would go get a tf727-np208 or np241 and use that to keep it simple.
as for the axles I would use the one already in the truck and just change the parts from the knuckles out to make it 5x5.5 botl pattern to get rid of the unit bearings and don't use the CAD axle that would be probably in the parts truck you find for the knuckles-stubs-hubs etc.
you would get a lower range as np203 is 1.96:1 and the others are lower , except for the np205 wich is 2:1 wich is pretty much the same.
I installed the engine/trans attached but I think with the transfer attached it would be hard really tricky lol
if you get a trans from a truck with a np208-241-205 it will not work with a np203 because the tailshaft is np203 specific , if it is full time and you don't have a use for it I would go get a tf727-np208 or np241 and use that to keep it simple.
as for the axles I would use the one already in the truck and just change the parts from the knuckles out to make it 5x5.5 botl pattern to get rid of the unit bearings and don't use the CAD axle that would be probably in the parts truck you find for the knuckles-stubs-hubs etc.
you would get a lower range as np203 is 1.96:1 and the others are lower , except for the np205 wich is 2:1 wich is pretty much the same.
I installed the engine/trans attached but I think with the transfer attached it would be hard really tricky lol