Need help Identifying 8.75 3rd member

"suregrip" was Mopar's name for their "posi" units. They used the same name for both the clutch type (Dana Powerlock) and the cone or auburn type (which you have there) look about 3/4 of the way down on the link below.... it shows the difference.

http://images.google.com/imgres?img...s=org.mozilla:en-US:official&hs=4CQ&sa=N&um=1