Mopar use to put on drag seminars back in the day before they went BK the first time, they always advocated running one quart of gear lube in both the Dana 60 and the 8 3/4 for drag race only cars. The explantion was that the one quart was way more than adequate for lubrication at the track and the additional fluid in the rears was for noise containment and long, hard drives across country during the summer