Born from racing, the Screamin' Eagle® Racing - King 6 is a battle-tested performance transmission developed by the Harley-Davidson Factory Race Team competing in the Mission King of the Baggers series. Engineered for enhanced gear engagement and durability. Key features include modified back-cut angles on the shift dogs to improve gear engagement and super premium heat treat and shot peening on gears and shafts ensure race-tough strength and durability. You’ll enjoy the smooth shifting performance and know this transmission is built for extreme performance in mind.