Was just putting a teraflex leveling kit on my 13 JKU and noticed the rear passenger side spring had no isolator. I have 13k miles on the jeep and only noticed it was missing just now. I put in the teraflex leveling spacer in the back, which will serve as an isolator I suppose. So, other than the back end of my Jeep not sitting perfectly level, will there be any ill effects of not replacing the missing isolator? I really do not feel like dropping that axle again, and I doubt Jeep will replace it since I put in a leveling kit.