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whats the difference? The gears dont need break in, they are ran at the factory and are heat treated to 50+ rockwell, there is nothing that wears off of them. Perhaps minimal clutch dust from the posi if its even a clutch style and there is a magnet for metal debris on the stock cover, if you upgrade to a TA cover its worse for the rear because if there is any debris its nit being collected by teh magnet, its floating around the assy. Clutch and cone stuyle posis like eaton and auburn usualy require mineral oil with friction midifier, worm gear posis work well in synthetic or mineral. Either way no break in is necessary. There is nothing you can do to upset the gemotery of heat treated hypoid gears. The only possible factor is if you use new bearings the preload is a few inch lbs higher so that when the rollers seat in the races the preload drops. New bearings may give off a little more heat until they seat. Thats about it.
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