I am swapping my 60 into my 97 f250 and have a couple of questions about what all you guys recommend I do while it's apart. First of all, I think my bearings are ok, but is there a rule of thumb to tell? Also, I want to clean out all of the grease, and re-pack my bearings. after that, how much grease should be in the hub? As much as it will hold? And is the grease seal in the back of the hub the only other thing I should worry about replacing when I put it back together? Thanks fellas.