I am not trrying to by a dick about what I am about to say, but ity seems like the 2wd-4wd-ZR2 axle swap is a common question on the forums. As far as I know (please correct me if I am wrong, but I am pretty sure I am right), the 2WD is the shortest, followed by the 4wd at about +2 in. and the longest of the bunch is the one found in the ZR2 equiped models at about +4in. over the 2WD and +2in. longer then the standard 4WD. that means that you can't swap from anything except what you have (2WD-4WD-ZR2) regardless of truck or sport ute. hopefully this helps someone.