3681843 is trans I.D. number. trans is a 1974
4661 is build date. 5-1-1974
5741 is the sequence # I believe
for future reference go to:
http://www.mymopar.com/downloads/transguide.pdf
this is a listing of trans I.D. numbers.
the other numbers you posted I don't think really mean anything.
hope this helps