I use a hardened T-50 for the rears with a serious soaking of PB Blaster, and use the Torx bit on my impact gun, set on 50%. I would HATE to try and remove that sucker without air tools. They are ALWAYS tight and rusted to crap on every tour I've come across, and Ford stuck it to us by making the damn bolt a Torx instead of a regular hex-head bolt.
