Early 70's A'904 Torqueflite downshift

There was a valve body change some where along the way to give them a "part throttle downshift" . You may need to search that phraise for more information. I have never known one to downshift to 1st.
Thx, that's what I thought. Bought this car when I was 18yo and this 76 Dart was 6 yo... and drove it a bit, always worked like that, stays in 2nd in low speed unless I stop or manually downshift.. Now I put it back on the road and it just seems it should downshift to 1st but maybe that feature is not there.
I also have a 1999 318 Dakota with a 46RE so it feels much different.
Wonder if all the A-904s are like that.