I might have had the same problem. Mine would click only under 10 mph, and only for the first 1/4 mile or so of any given trip. If I lightly applied the parking brake it would go away. I never could finger out exactly what it was, and I since don't have to worry about it because I've swapped in an entirely different rear, subframe and all. One thing to add, and I'm not sure if this even matters, but in my clicky rear I had pulled the abs sensor out of the side that was clicking. It never got put back in. I have wondered for awhile if that allowed water into the void between the two wheel bearings. What if those bearings took in some of that water? I know that they are sealed bearings, but stranger things have happened.