It was pretty cold on the garage floor yesterday, but I installed a new OEM rear upper control arm. Was getting that rear rattle just 6 months or so after installing an aftermarket rear upper control arm. The one I removed still seemed "tight", but the rattle is gone so hopefully that was the issue.
BTW I'm loving the studded Grabber AT2's. Really liked the looks and capabilities of the Cooper Discoverer STT PRO's, but they rode very hard and loud. Was planning to go with a set of Falken Wildpeak A/T3W's for my Summer tires, but seriously considering another set of Grabbers instead(non-studded).
Sold Grab AT2s for a while. Only issue, they have rather delicate sidewalls. They did fine on highway, even gravel roads, but guys who took em out on the farm tended to tear holes in the sidewalls.