I might be buying a V6 and had a question

I am looking at a mighty max V6 with 200,000 miles on it so I can only assume it will need a new motor soon. Coming from a DSM Backreound I would seriously consider dropping in a 4G63 turbo. From what I understand the 4G63 will bolt up to the 4G64 Mighty max trans but I assume the V6 trans is different. Is this true? If so how hard would it be to find a 4G64 4WD trans?

I would also like to know a little about the V6. What motor is it? How hard are they to find? How reliable are they? What should I expect out of one with 200k?

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