Mopar Posi rear axle

Dartswinger70 said

...term is "Limited slip differential" Mopar is "Sure grip", Chevy is "Positraction", Ford is "Trac Lok" in recent years anywaze...

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They are all brand names for the limited slip type differentials.
Pontiac called theirs Saf-T-Track.
Oldsmobile called theirs Twin Grip.
Even later my own 2007 Dodge Ram has a 3.55 "Anti-Spin" differential.

I love these memes though...