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The Yukon Grizzly Locker is a mechanical positive-locking differential designed for drag racing, circle track racing, off-road use, and other performance applications. It features an 8620 steel case, forged 8620 internals, and a patented design that enhances strength and reduces common locker failures. The inner clutch teeth have an improved design with a larger radius at the base, offering up to 350% greater strength than back-cut designs, which helps prevent breakage from shock-loading or axle failure. These units provide maximum traction and strength and are available for various car and truck applications. Grizzly Lockers are automatic, meaning they require no pneumatic or electronic activation. They lock under throttle and partially unlock off-throttle, producing a clicking sound during turns. The product comes with a one-year warranty against manufacturing defects and up to $2,000 for collateral damage and associated labor. It is tested and assembled in the U.S.A.