Mopar Posi rear axle

67autocross said

My 67 Dart 2 door Sedan (or is a post car?) has a Detroit Locker in the 8 3/4 …. Do I still tell people it has a sure grip?

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I'd call it exactly what it is.
The "Sure Grip" reference pertains to an OEM type of limited slip like the clutch or cone type differential.