Took my XK in this morning to take care of a couple of codes and to finally replace the factory struts and springs with Bilsteins and Old Man Emu springs due to the new addition of the bumper and winch. Not sure if I'm the first to try this combo now that I think about it, but it doesn't work. I talked to the tech (same guy who installed the lift almost a year ago) who said he barely got the passenger side together but even with the weight of the Jeep on the ground, could not get the knuckle to mate back to the upper control arm on the drivers side. Even if he could, the Superlift knuckle was almost contacting the spring with the Jeep on the ground. That translates into almost no downward travel without the knuckles contacing the springs/struts even in the most mild articulation. So he's now pulling it apart again and putting the factory springs back on to the Bilsteins. It never crossed my mind the OME springs wouldn't work with the Superlift knuckles. The whole thing may work with new upper control arms, but I elected to not spend that kind of money on something that may or may not work. Anyway, more and more guys are installing the 4" kit these days, so if anyone gets this combo to work, I'd love to hear about it! Dang.