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Yeah posi or positrac from Chevrolet is the same as a LSD. So are all of these. That's just the name from the factory.

* Pontiac: Safe-T-Track
* Ford: Equa-Lock and Trac-Lok
* American Motors Corporation: Twin-Grip
* Mopar: Sure Grip
* Ferrari: E-Diff
* Fiat: Viscodrive
* TVR: Hydratrak
* Oldsmobile: Anti-Spin
 
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