Front band damage

Broke the Trans down today, noticed it has steel gears in the front and aluminum gears in the rear. Is this normal? Both are 4 pin. Also noticed a missing washer from behind the rear gears and the shaft is missing 2 seals. FML. The Trans part number is PK4505162. I think it's a 998 or 999. Both clutch packs have 4. Time for an overhaul.