904 cast numbers?

[QUINN FORBES]

It has Probably been on here a million times but I can’t seem to find it anywhere.
The last two series of cast numbers indicate what?
This 904 was from a 318 ‘72 Challenger by the first cast numbers but I do not know what the other numbers tell.
Anybody have a link or know to help my curiosity.
4140 5641?

 

[townsend]

4140 is the date code: November 27 1972.

 

[Oldmanmopar]

Where is this info on the web for ID and Date of parts? Post a link. Thanks Steve

 

[townsend]

Go to MyMopar:
1972 parts catalog: Auto Transmission Text page 21-1 3681063
1973 parts catalog: Auto Transmission Text page 21-2 3681063
Date code: 1973 parts catalog page INF-9