Ther is a pad located on the drivers side just above the oil pan.
Might read something like this:
PK 4431552 9988 8395
First 2 [PK] is the plant in this case it is Kokomo
next 7 [4431552] is the part number, in this case A727
next 4 [9988] is the date code calculated on a 10000 year calendar search the web for a calculator :)
next 4 [8395] this is the production sequence.
I hope this helps.
AlV