Quaife is a UK-based engineering specialist in high-performance drivetrain components, best known for its Automatic Torque Biasing (ATB) limited-slip differentials. Since 1965, Quaife’s gear-driven LSDs have offered smooth, progressive torque transfer without clutches or friction plates, delivering improved traction, predictable handling, and maintenance-free operation. Available as direct-fit upgrades and complete transmission gearsets for a wide range of cars—from hot hatches to sports coupes—Quaife products give drivers confidence under throttle in every condition.