[Tommy]

I'm no expert, but here's what I think I know. Positraction is a specific brand name for a limited slip differential. Limited slip differentials use clutches in the differential to transfer power to the wheel that has the most traction. A Detroit Locker is the brand name of a locked differential that turns both rear wheels at the same speed regardless of traction. A locked differential is not very friendly on street cars that go around corners where the inside wheel must turn at a different speed than the the outside wheel.