[1969 GMC]

The only thing I could think of would be to find an adapter from a Dodge or Ford that originally had a NP435 and a NP203, but that combo seems to be pretty hard to find. I am not even sure if the 4x4 tailhousing from the other makes would work. I wish I could help more but there arent many GM's that came with the NP435, and little is known about it. One thing though, if you were to find an adapter and transfer case that would work, the mainshaft of the 2wd NP435 is 35 spline, and NP203's are not 35 spline input. You would need to get the mainshaft from a Dodge or Ford tranny to match, but that would be a lot of work. You could even look for a divorced NP203, but they are like hens teeth. Good luck!