Hi Gribbs ... what is your diff ratio?
Mine is a Feb 2012 build and has a 3.45 final drive (DLKP), 230mm rear diff (DR1P), and 195mm front diff (DJCS / DS7S). Do you have the build sheet for yours to compare?
It might be that the early models had the 3.47 final drive 225mm iron diffs, and they later introduced the newer 3.45 230mm aluminium diffs.
The different diffs are here ... http://wk2jeeps.com/wk2_maintenance.htm#FAXLE