Title says it all. I have a 78 SC. A mobil mech once told me I had factory LSD. The car was jacked up with both rear wheels off the ground. He said that when you move one wheel and the other one moves as well, reverse direction I think, that means you have LSD. Coulda been total BS and I wouldn't know.
This mech turned out, some years later, to be a total criminal/thief/liar and is now headed for the gray bar hotel...none too soon either, but I digress