1964 Valiant "Get Runnin & Drivin"

YY1 said
That's very strange to me.
In all my time with dozens of Mopars over dozens of years, I've never had a steering box loose.
...and I drive them pretty hard and even off road sometimes.

Same here, never on any of my E bodies or A bodies, but I did have one loosen up on a ramcharger not long ago.