IIRC my13 cars (mine was built nov 12 and is a my13) use the older "GLX" spec front suspension which was firmer than the GLR /GLXR, but rears are all the same as previous GLR/GLXR (comfort/sport), also all MY13's have the 3.917 diff (manuals).
My GLX bottomed it's rears out with around 400kg and a trailer with around 150kg down weight numerous times accross the nullabor and between Port Augusta and Broken Hill, was absolutely shocking and unloaded the front quite badly, the ABS would kick in on even moderate braking on the fronts. I didn't go with a Ultimate suspension due to lack of dealers in w.a and a good relationship with another brand, but i only got around 1/2 inch lift on the front from standard (sits at 565mm atm) but a 2 inch on the rear easy (630mm atm). Of interest tho, is i did get the claimed 50mm increase from how the suspension was at time of fitting with the front ARB bar (was sitting just under 520mm) and the rear, when loaded was sitting around 530mm and unloaded but with rear protection bar, canopy, roof rack and awning around 560mm. The change to how it drives is amazing, a great additional feature is the rear bar no longer scrapes at places it used too
sS