I cant see why anyone would opt for those over a toybox, those gears are ridiculously expensive. Even after you do the driveshafts your still well ahead of the game.
It's a smaller 10-spline shaft, instead of the large 19-spline that is stock. It's not necessarily weak, but it is weaker than stock.So why is the input of the toybox a weak link? I was under the impression that it was a pretty stout unit.