A901 Trans Capacity

OK so I fixed a pan leak by replacing my pan with a cast Aluminum pan from Summit that holds an additional 2 quarts. I thought the 904 capacity was 5 quarts. So I added 5 while the engine was at temp in neutral and kept adding ATF. It took 9 quarts and it just started to hit the dipstick indicating 1 quart low. I haven’t added it yet because I am so far past what I expected.

The engine is cold and not running it shows full. So what am I missing here?