Re: 93 Bravada
The transfer case is the same basic unit. There are slight variations between models and model years (flange diameter, rear slip yoke spline count, etc), but its the same piece.
The stock motor has too much compression for boost on anything resembling pump gas. Which means you're limited to like 3psi (why bother) or like 114 octane race gas to keep it from rattling apart. At that point, you're likely to uncover all kinds of other weaknesses in the V6 (rods come to mind). Add to that the differences in fuel system, computer and such and this is not a simple swap. There is alot of difference between the Sy/Ty installation and your average V6. The long-blocks are pretty close (except for the low compression pistons) but the entire fuel / induction system is different.
Surf on here some more. You'll learn that a turbocharged V6 isn't the most reliable piece of hardware GM ever produced. Many of these trucks run once every 6 months or so, because it takes that long to put them back together again! If you're looking for more power, think seriously about adding 2 more cylinders. Its likely to be a bunch cheaper.
'JustDreamin'