I had the same thought.... talked to Matt over at Moe's and he said he could get me what I need to do this swap.... there's a catch tho.... an expensive one!
In order to swap gears in the front you have to swap the entire front axle. Something about the carrier being welded to the axle or something. Gears are a little beyond my knowledge but I was going to attempt the mod with the help of friends.
If you're serious about the swap, find a 13 or compatible truck in a junk yard with the rear end tore up and buy the front axle out of it. Matt also said that Mopar is our only current option for gears and LSD's.