How is that exactly? The Dana Power Lock is simply a clutch type sure grip. The Auburn style was the cone type sure grip. Although they do work differently, each is still a sure grip limited slip differential, so I don't know what you're trying to say. Mopar never used the term "Positraction". That's a GM marketing name, much like Sure Grip is Mopar's. Hep me out here. lol Are you saying the cone type had another name besides "Sure Grip"? I must admit, that seems kinda a vague memory to me.....but I cannot remember what it was. Maybe "No Spin"? I think someone else had the "Anti Spin" name.