My LJ Rubicon also came with a transmission skid plate and gas tank skid plate. I don't know if it all Rubicons have them, but that could also help justify a higher price.
One thing on gearing, both my dana 30 in my XJ and my dana 44 in my LJ have 4.88's, and the sheer size difference is amazing. I would think that makes the dana 44 center section much stronger.
2005 Unlimited Rubicon, Sahara Edition #556, Colorado Jeep Club Member #556
Rusty, if you are reading this, I am still waiting for my $249 refund from 06/2010. Pm me for my address to send the check. Thanks!