Anything can be done with enough money. But whether it's worth it is the real question.
Are the floors of the ST171 and AT175 the same? ie: Is there a hump for the driveshaft to go to the back in your car?
I wouldn't think there's any correlation between the GT-Four bits and the ST17x bits. So I would say that it's highly unlikely that the GT-Four rear end would fit as a bolt on.
Having said that, I have no idea and I'm just giving you my opinion, not fact.
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