what trans code is this

[dartswinger7]

my wife bought me a72 dart swinger while i was deloyed and the guy she bought it from gave us an extra trans. right now the car has a slant six in it i looked at the casting stamp on the driver side of the trans and i cant find this number anywhere. the stamp is PK3681 after these numbers is looks likeits been stamped again, cant tell if it was first a 821 or 441. any help would be great thanks. did the 727 come behind a slant six at any point, this is my first mopar build been a chevy guy prior to this buy.

thanks

 

[fishy68]

The only time I ever saw a 727 behind a /6 in a car was in a taxi. They also used them in some trucks that had the /6

On my trans. list there is no PK3681821 or PK3681441. The closest I show is a PK3681841 which shows to be from a 74 Dart or Plymouth Valiant /6 std. duty 904.