Diff oil d8dz-19c547-a
Reply #1 –
I think most people run 75-140 in their traclok 8.8's, it might be less critical on an open diff 7.5 tho (which I assume you have). As far as the anchor attached to it, its suppose to dampen vibrations, I've always removed mine and felt no difference, but I'm sure Ford had their reasons.