I've never filled a 7.5, took it out instead. But according to Ford (owners manual), it takes 2.5 quarts for a 7.5, and 2.75 quarts for the 8.8. My 8.8 took 3 quarts, and it wasn't quite topped off, but the fill spec is to .25" below the fill hole.
I'd say, get 3 quarts, and put them in. If it isn't running out the hole, you're good.
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I got my Jesus on the dashboard, but the Devil's under my hood!
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