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Another option is Currie’s Posi limited-slip differential. Similar to the Truetrac but rather than using gears, the limited-slip Posi uses clutch packs. We all know what a manual clutch disc looks like, so visualize several small clutches on the left and right side of the differential that have spring tension on them. The clutches and springs provide a smooth transition between wheel slip around turns and great overall traction for today’s street-driven vehicle.