Re: I have some ideas, could use your guys help...
Seriously, here's the parts you should be looking to score.
Transmission & transfercase from a '91 to '96 Olds Bravada. Plan on upgrading the trans if you've got any serious power, but the transfer case should be good to go. Tcase is the same as the ones in the Sy / Ty / and Astro / Safari. Various models & model years had slight differences (front flange diameter, rear spline count, vans use a different chain configuration for less noise, etc.)
Front axle assembly from any year Bravada. Later model years have a drain plug, so they'd be more desirable, but any year would work. Pickup all the parts, including axle shafts and spindles.
The fun part will be making all that stuff fit, including a front propshaft, integrating the two suspensions together, brake systems, making the front axle clear the engine, floorpan modifications, etc. This is not an easy project. Prepare to spend ALOT of time, money, and effort doing this (if you're serious).
'JustDreamin'