MFactory is a USA-based specialist in high-performance limited-slip differentials and close-ratio gear kits for manual transmissions. Their helical-cut differential assemblies use precision-machined, heat-treated alloy gears arranged for smooth, progressive torque biasing—delivering consistent grip transfer under acceleration and cornering.

Complementing the differentials, MFactory’s close-ratio gear sets feature CNC-ground, cryogenically treated gears with shortened spacing between ratios to keep the engine in its optimal power band. Each kit is engineered for direct-fit with OEM cases and shafts, and every component undergoes rigorous bench and track testing to ensure race-proven reliability. Ideal for street, strip, or circuit use, MFactory gearing solutions give drivers the precise shift feel and durable performance demanded by enthusiasts and racers alike.