Most likely, it's an aftermarket, and probly also has a Coleman T-case, too. Probly a model 22 part time, although there was also a model 42 full time case also. I do know that GM did use Coleman parts in the mid-'60s on heavy duty 4x4s, however I'm not too sure about any that were built factory before that using the Colman parts.
When you get her home, can you put up some pix? I'd really like to see it!
