I don't deal in theory. I deal with reality. I have owned said GV setup and have worked countless hours with a good friend who owns a driveline build and balance shop dealing with this issue. biggest difference between the GV and a divorced transfer case is the ability to soak up harmonics. check out this youtube vid for better explaination. do bear in mind our trucks do not operatate in a labatory situation.I... don't think this is right. First off, you are talking about a divorced overdrive unit. They do sell them, so they ought to work fine. I believe people also have divorced transfer cases as well.
As far as vibrations go, I don't see why it would be nearly as big a problem as you think - Each driveshaft segment would need to have two U-joints, one on each end. As long as each shaft is balanced by itself, and the GV unit is offset correctly(so the angle of the input shaft on the GV unit matches the same angle of the output shaft on the transmission), the phasing will cancel itself out on /each/ shaft independently. Thus, them running at different speeds(or the same speed) would not make any difference.
Back to the OP, just putting a 3.55 rear end is a much better idea, because you are only a 2wd truck. Replacing the rear gears is easy, the front as well is double the cost, and harder as well.
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