I used to make a little money when I was in High School (’58-’62) by modifying the valve bodies of Iron Torqueflights for people that towed trailers, so that they could punch the trans into first gear for engine braking at any speed. Normally it wouldn’t do it until you were below 20 MPH.
It made towing in the mountains way safer to be able to outwit the trans.
I’m totally impressed.
You’ve still got ATF in your veins.