94 3500 4x4 gmc. Transfer case wont work?

[64swb]

Does the transfer case actually shift into 4hi/lo? I'm assuming the tcase actually shifts into either one of these ranges but the front doesn't engage. If this is the case its most likely the front differential actuator. It is electronic and they are notorious for failing. You can get a replacement stock type one, or like I did there is and aftermarket cable setup you can convert to so you have a pull cable under the dash to lock the front end in. I believe it is made by posi lock? Can't remember, I got mine through summit though.