The sheet metal is interchangeable between a '64-'66 Chevy C10, C20, C30, K10 K20, so swapping tin, is not an issue. The 2wd & 4x4 frames & suspension are entirely different, between the 2wd & 4x4, as well as, the frame cross-section on the 1/2 ton & 3/4 & the 2wd & 4x4. Anything is possible, but reverse-engineering a 2wd to a 4x4 or vice-versa, is rather involved, costly & time-consuming.
