I get creaking now and then. Finally figured it out, its the.... knuckle arm? I think thats what its called. The rotating joint thing right above the tire. Ive had it on both rears. Sometimes after it rains, or now that its winter with metal shrinking and all its started again. Jacked car up and sprayed wd-40 all over it, creaking goes away. Comes back eventually, but its not hard to spray more oil.