I was rotating my tires today and noticed a plastic piece on the front axle that looks suspicious. It is the black piece in the center of the photo between the u-joint and the axle. It looks like it should be pressed in to seal the axle. It is the same on both sides of the jeep. Anyone know if this is normal? Only 6k miles. By the way, rotating 35" tires is a pain in the butt.