The hubs on a 2nd Gen are not known for their reliability, and the 3rd gens, while not being that great, seem to have less problems. As far as swapping them, I haven't heard of anyone that has done it, or attempted it. The one issue I can see right off the bat is if you did that you'd end up with 8 lugs up front and only 5 in the rear. I would check over on Pavementsucks.com and ask those guys over there, they are pretty knowledgeable with that kind of stuff.