Nope the real axle is also a D44 in all Jk's the difference you may be thinking about is that you could get 4.10 gears on 07's with the tow package, and some of the others had 3.23 gears I think. As far as no armrest, do you mean there is no center console whatsoever? or is it just a bit lower than what you would want for an armrest? There are a few aftermarket consoles out there, with the Tuff Security console coming to mind. Its a little pricey by some standards but it gives you great security. The lack of TPMS can be resolved with a superchips tuner.
Fortis cadere, cedere non potest
Poison Spyder BFH w/ trail stinger, custom rear BFH, crusher flares, rocker knockers, evap skid, hood louver. Rock Krawler 2.5 Max Travel, Teraflex rear tire carrier, River Raider cowl snorkel,Warn VR 10,000 lbs winch, sPod, Rigid 50"SR.