no, the field is blank on the X model, it wasnt.
it is under differential for limited slip. says its an option when ordered with the full six spare, disk brakes w/dana44 rear
but back on subject...if i did it again, i would get a sport with the d44 rear or a used rubicon. 3.5 inch superflex lift and 33's and be done.
with the rubicon, the lockers are there, transfer case is setup already...for a daily driver/weekend wheeler it is a decent setup.