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The existing tranny is probly an old Borg Warner or an NP435.
As far as switching it into a 4x4, I have never done it but I would imagine that you would just have to change the output shaft/housing. Someone please correct me if I am way off. But thats what came to my mind.
Would I have to disassemble the trans like a auto trans to change the tail shaft I know in the c6 their is a snap ring in the trans that you have to take out before the tail shaft will come out