727 transmission or 340 trans

My 1969 parts manual indicates that there were/are differences in the 727 transmission depending on application. The differences include the number and types of springs and clutches as well as different valve bodies as was mentioned above. The 340 engines had the heavy duty 727 transmission which differed slightly from the heavy duty ones behind the Hemi and 383 HP engines. So I guess you can say that the 727 behind the 340 was "unique" if not "special".