1970 C10 broken 4x4 shifter

[berghandler]

I have a chance to purchase a well used non running C20 4x4 truck that has a broken 4x4 shifter. Could not test dry shifting because of broken 4x4 shifter so can’t tell if transfer case shifting is operational or not. Standard 4 speed shifter did shift ok. Wondering if these np205 transfer cases have a history of becoming tight or what might cause shifter to become broken at connection at transfer case?