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...but for now I need to figure out if a used transfer case comes with the transfer case extension. If it does I will be stoked because I can unbolt it and pop a new one in and have the issue solved. If not I am kinda screwed

I just checked on car-part.com for Mitsu 89 D50 pickup transfer cases. There are plenty available ranging from $50-400. Try calling one of the parts pullers from there and ask them if it's included if you buy an xcase or if you can purchase it separately for cheaper.