The only real issue that I've heard of is TJ related, not limited to the Rubicons and that is that the exhaust manifold tends to crack on them. The other thing is to make sure you put a rollover loop around your grille. If (or is that when) you go over, the radiator is the highest point and almost ensure that your vehicle will be disabled... quick way to make a bad day even worse. As you probably know, the dana 44s aren't true 44s... they are a dana 30/35/44 hybrid so there are some strength questions, but certainly much stronger than a standard 30/35. Other than that, I can't really think of anything to look for specific to the Rubicon. All in all... a great purpose built vehicle. I would seriously consider getting rid of the Ram and the Scrambler if they came out with a diesel in the Rubicon Unlimited.