Yesterday I found 60HD on it. And a 30 Spline count when I counted it twice. I remember that site you gave to verify from Dana 60 BOM Numbers | Dana 60 Identification It has 60HD stamped into the spot where the model number should be.
I don't know why searching for any information on these old mopars puts a smile on my face every time. Just does. Ahh it must be love.