I'm interested in doing the exact same thing! but unsure if it can be done; I'll be matching a JK rear to a waggy front; thinking I'll probably have to change the rear to 5.5x5 also; probably only because jk wheels wont clear a manual front hub.
1992 YJ 1"Body Lift, Slip Yoke Eliminator & CV Driveshaft,
2.5" TJ exhaust, WJ valve cover, XJ Computer, External Slave Cyl AX15,
Durango Steeringbox, No track or sway bars, CJ tailgate, on 31's :)