there is an option for the X that has 44s front and rear and 4:1.... they call it the Rubicon

 

Yes, you could in 2007, it was in the option packages. I almost bought a used 07 4 door JK with rear locker, 4:10's and sway bar disconnect, I got my Rubi instead though! That was the only one I ever saw like that. I am sure there are others though, but I am guessing it was a real rare package.

 

that's what I wanted to hear!! I think I found one too

 

My '07 JK X auto had factory D30 front, D44 rear, w/ 4:10 gears and locker in the rear. Only one I have seen in my area.

 

Forgive me if I'm wrong, but I don't think the X D44 w/ locker is the same D44 w/ locker as the Rubi. I think the Rubi has more splines on the axles, but I could be wrong.

 

I have no clue about the Rubi. Just know my D44 rear was a locker when we pulled it. Was replaced w/ Detroit Tru-trac 5:13

 

You need to get a build sheet for the jeep. Take last eight of vin to dealer. I got one again to show a guy that I work with that my X has 4.10's and heavy duty springs and shocks, and did not even have a hitch. If i get another JK, I will regear to 4.10 because ill never run more then a 33 and mine pulls alot. Mine to is an auto.