Easy fix, 4WD front axle [with greasable u-joints], gear to gear NP20? transfer case, little driveshaft build, torch a hole for the 4WD shifter, boot it in nice and have fun, my granny had one of these, 1970 Chev/GMC, blue and white, 427 or 454, cant remember, dont these have dual fuel tanks too? grannys did.
Manual lock in/out hubs and Lockright Lockers front and rear.
