I did a bit of reverse engineering on which clutches are active in each gear as I couldn't find any useful information online for the ZF8HP75. This is for a 2019 RAM 5.7L which I don't believe should matter as I doubt there are variants of the ZF8HP75.
1 2 3 4 5 6 7 8 A Yes Yes Yes Yes B Yes Yes Yes Yes Yes C Yes Yes Yes Yes Yes D Yes Yes Yes Yes Yes E Yes Yes Yes Yes Yes C E C D C E A E