Torsen
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Torsen Torque-Sensing is a type of differential used in automobiles.
Torsen differential from an Audi quattro
Four-wheel drive
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A four-wheel drive, also called 4×4 or 4WD, is a two-axled vehicle drivetrain capable of providing torque to all of its wheels simultaneously. It may be full-time or on-demand, and is typically linked
The Jeep Wrangler (pictured is a TJ Wrangler) is a 4WD vehicle with a transfer case to select low-range or high-range four-wheel drive.
Center transfer case sending power from the transmission to the rear axle (right) and front axle (left)
The Lamborghini Murciélago has an AWD system that powers the front via a viscous coupling unit if the rear slips
The HMMWV is a 4WD/AWD that (continuously) powers all wheels evenly via a manually lockable center differential, and Torsen torque-sensing differentials both front and rear.