Wow that's quiet a project you got for yourself there. Every article, letter, official opinion I've ever read/heard always says the same thing thing.....sell the two wheel drive and buy a four wheel drive. It is much easier to take a four wheel drive sub and lift it. Put some lifted(re-arched taller) leaf springs on it, some 3/4" or 1-ton full floater axles on it, new drive shafts and you're done ready for 40" tires. Even doing this you still have quiet a bit of work getting the sterring to work right, probably need to go with hydraulic assist. Here's a helpful web site of like minded manufacturer/shop ORU:
ORU (http://www.offroadunlimited.com)
If you're set on converting your two wheel drive to four wheel drive, try and see if you can find a donor/parts sub of similar year but four wheel drive. Decide which one has the best drive train and swap the goods parts to that one. This is just my .02 so take it for what's it's worth. Try PMing EVO22 his shop does some killer conversions and he could probably get you pointed in the right direction.
I've got a good friend with a similar year sub running 37's, on 1/2 ton axles and he has to be vary careful offroading as not to break something. We went bogging in a muddy feild a couple of weeks ago and he broke the rear pinion gear, so definately go with 3/4 ton or bigger axles. I'll see if I can find a pic of his truck for you.
Chris