65 Dart GT with older 8.25" posi rear. Gear oil / Limited Slip additive

69FBCuda said

You need to pop the cover to see if it has clutches or cones to determine a requirement for Sure-Grip additive. Fluid should just start running out the fill hole wit the car on level ground.

Knock knock.....
Who's there? ....
Who!..
Who who?

Great there's a bird in the house.

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Ok, It's a clutch type so I got the additive. I put in 2 quarts of 80-90 oil, 4 ounces of additive and it wasn't full. So I've now added another 1/2 quart and it's still not full. I thought these held just over 2 quarts? Am I missing something or just keep adding fluid until it starts dripping out of the fill port?