I've got a Black Diamond 3" lift on my 4dr Rubicon and I like it. I've had no problems whatsoever. The only issue I can see is it uses a trackbar relocation bracket on the rear. I just had my buddy weld up some reinfocements to it and no problems at all. I used M-Force shocks and like them alot as well.
I see that. I doesn't make sense to me though. What could possibly be different? The axles are D44s but that sould have no bearing on the springs, trackbar mounts, control arms etc. The only other thing I can think of is the electronic swaybar dissconnect but on the Black Diamond kit I installed it came with longer Swaybar links for the rear and you moved the stock rear links to the front. Mine works flawlessly.