Can anyone help identify transmission?

townsend said
Date code is January 20, 1984.
4329436:
999 transmission found in Gran Fury, Fifth Avenue and Diplomat with 318 engine, 2.6 axle ratio and it's a lock-up.

Wow, that’s more than I could ask. Thank you. I’m guessing it’s just the same as a 904 except it has a lock up?