The Turbo X marks the debut of Saab's XWD ("Cross Wheel Drive," as the Swedes say it), a fourth-generation Haldex-built all-wheel-drive system that will also be available on garden-variety Saab 9-3s. Unlike previous Haldex systems, the center clutch-pack coupling (which is technically not a differential) no longer relies on wheelspin in order to transfer torque to the rear axle.
Source: AutoCrave
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