Saab XWD

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XWD, an acronym for Cross-Wheel Drive and also known as Haldex Generation 4, is an all-wheel drive system designed by Haldex in partnership with Saab.^[1] The XWD is a permanent all-wheel drive system, that can pre-emptively and continuously change torque distribution before wheel slip occurs.

The XWD system is designed to improve take-off performance by having the capability to lock the front and rear axles fully. During highway cruising, it can adjust torque distribution, allocating as little as 4% to the rear wheels, a feature intended to improve fuel efficiency. Additionally, the system is engineered to rapidly transfer torque distribution to the wheel with the most grip, providing immediate traction in various driving conditions. Using the two couplings, the XWD system can send 85% of its available torque to a single rear wheel.

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The XWD system debuted on the 2008 limited edition