Limited-slip Differential (LSD)

Types include clutch-pack, helical (Torsen) and viscous designs. They improve traction and cornering exit. Some require special oil or friction modifier. Clutch-type units can wear and lose their locking effect over time. Helical units work without wear but cannot send torque to a wheel that is completely off the ground. Some sporty front-wheel-drive cars use them to reduce wheelspin out of bends.

Internal clutches or gears resist speed differences between the wheels.

Using the wrong oil can cause chatter in clutch-type LSDs. Electronic systems often simulate an LSD by braking a spinning wheel.