Owners/sellers of older cars (1960s-80s) if they have a limited differential will say it has a “posi” rear end which is short for “Positraction” the name of Chevrolet’s LSD.
Even though in a Ford it is a “Traction-Loc”, Chrysler/Dodge/Plymouth used “Sure-Grip”, Pontiac’s has the “Safe-T-Track” and AMC called it a “Twin Grip”.
Just this past weekend at a car show I overheard a guy bragging about his Dodge with a “posi” rear end. Unless he swapped it out it, probably has a Sure-Grip differential.