You'd have to do more than install a 2wd switch -the front-axle-disconnect is a bit more complex than that.

You're headed into uncharted territory. A 2hi VX would be great -maybe you have most of the parts to make that happen now?

In any case, take some pictures of each t-case and see if there are any differences to the case/connectors. I'll bet that they're the same, but who knows?