My manual calls for "5 pints", IE 2 and a half quarts. If you have traction-loc then call it 2 quarts plus a tube of friction modifier. If the rearend is new/rebuilt or getting a replacement differential it will hold 5 pints. If it is just having it's oil changed then almost a pint will still be in there, so 2 quarts.
1967 and earlier rears had filler plugs on the rear housing, later ones had them on the differential. Many times over the years has someone mated a "late" housing to an "early" differential and discovered they had no fill hole. And then there were lucky folks who swapped the other way around and ended up with two fill holes.
The old racer's trick to fill one of these was to jack up one side of the car, pull the axle and just pour the lube down the axle tube. Put the axle back in, etc, and you're good to go.
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