Need Information. What trans?

Your tranny decodes like this:

PK= Komomo Plant of assembly
52118318 is the part number
1974 = the build date of the tranny would be around late 89-90,as this number is of the second set of 10,000 day calendar.The 1974 is about 5.4 years into this new calendar.It does not mean the year.
The 4865 is the 4865 tranny built at this plant.

Mrmopartech