Thanks very much for the reply!
I didn't even notice that forum that you linked. Thanks! Looks like there's some good info there. I've got plenty of experience with Axial transmissions so I'll probably just go that route since it'll also get me the gear reduction I'd like. Unfortunately, TLT axles are getting harder to come by these days, but those are the ones closest to my budget. I love those Integy axles, but $300-450 for a set of 3 is more than I'd prefer to spend!
I wish I knew of more people in central Texas who ran these trucks. If so, I'd be inclined to leave it rear wheel drive. But otherwise, I'm really going to need it to be AWD because most of my friends are crawlers.
Tommy