Looking for a little help about going from a 3/4 ton to a 1/2 ton

[toddinak]

In a couple months I am going to start tearing into my project. First thing on the list is to convert it from a 8 lug 3/4 ton into a 5 lug 1/2 ton. I was planning on buying a mid 70's 1/2 ton truck and using the suspension off that. Swapping out the rear end seems easy enough, but as far as the front goes, can I swap out the entire front crossmember? Any help would be appreciated. Thanks!!