Yeah, it's about two quarts, but you will also need the special friction modifier from Ford.
The fill plug is at the front of the rear end "pumpkin" on the driver's side, but on my car (at least) the dogbone damper gets in the way, so I find it is easier to remove the passenger side axle vent (15mm wrench), hook up a gear oil pump from Wally World, and done ! You may like the smell of gear oil in the morning, but I really doubt it ! good luck.