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O.K., for the ones who apparently missed the link I previously provided: Limited Slip Differentials, Posi-Traction (Posi, Posis) Limited Slip and positraction (posi) differentials are designed to "limit" the tendency of open differential to send power to a wheel that lacks...

Actually he is correct. Posi, short for Positraction, is the name GM gave to their limited-slips back in the 60's. Its just a name brand for a limited-slip differential. It would be like calling any locker a Detroit. There is a big difference between a locker and a limited slip though. Limited...

Just keep in mind the high maintenance of ARBs. They usually work great, but do have issues. I 'wheel with several people with them, and they are always pulling them apart for one reason or another. Nice for the selectable locker, but complex and high maintenance. Detroits are install and...