Well now, I don't have direct contact with the 68' dart owner so info is limited from the guy I got the trans from. Car was side-lined for some reason, and parted out. Original owner was not to talkative. These cars had 5/50 warranty back then, so i assume the trans was replaced during warranty period with a "replacement trans". The dealer labor cost was probably greater than the new trans cost. I've had a bunch of these transmissions over the years and none that I can remember was not numbered. They are out there as you know, and they are unicorns.