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Rear Axel 80W-90 with friction modifier or something like Lucas Gear Oil 80w-90 and you don't need the friction modifier.

If the rear end is empty you'll need almost 2 quarts (3.75 pints) along with 4 oz of friction modifier.
 

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Owners Manual and Ford Service Manual call for 75W-90 and Friction Modifier, that being said, Ford put out a TSB a few years back calling for all 8.8s to use 75W-140.
 
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