They did, it just took a while. That was in 86.
In the interim there were some problems, but most of that iron has long since been crushed, melted, and come back as Chinese stuff.
FWIW I've had good luck with Lubegard "red" for fixing the TCC chatter on my Caddy. It's definitely beyond "snake oil" LOL
I have some lubeguard products around and plan to try them in the old Willys jeep when I can be left alone to fool with it.
I’m interested in how the gear oil additive performs.