yeah...if you ever figure out that mess, please let us all know.
A LS with the gears would be a great addition in my eyes when you consider that these vehicles are marketed as Family Tow vehicles.
we've discussed the no LS against RSC before, but never reached any conclusions. I personally don't think they matter to each other. The 2009 F-150 has the RSC crap and it comes with a Locker or a LS axle.
I'm more inclined to think that with the independant rear axle, that Ford left the LS out to prevent breaking a half-shaft. I know the Cobra guys have issues with that and their LS...maybe the Expy + the weight + 300 HP makes things go pop?