The fluid capacity, of your Allison transmission, is 28 quarts. The filter will take and additional pint. The manufacturer recommends that you do not over fill the transmission.
For a oil change including spin on filter between 16 and 20 quarts.
more then 4 quarts
Engine oil with filter change 4.0 quarts to 4.5 quarts
It should hold 10 quarts.
10 quarts
9 and a half
10 quarts
10 quarts.
Oil capacity is 10 US quarts + .5 quart for the filter.
9.5
10.1 quarts