Screamin’ Eagle Racing King 6 Transmission
Upgrade your compatible Harley-Davidson motorcycle with the Screamin’ Eagle Racing King 6 Transmission. Developed using experience from the Harley-Davidson Factory Race Team competing in the Mission King of the Baggers series, this six-speed performance transmission is engineered for enhanced gear engagement, increased torque capacity and race-inspired durability.
Racing King 6 Transmission
Designed for demanding performance applications, the King 6 transmission combines specially engineered gears, upgraded bearings and improved engagement surfaces. It is intended for riders building a high-performance motorcycle or replacing a compatible transmission with a performance-focused assembly. Racing King 6 Transmission
Racing King 6 Transmission
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. Racing King 6 Transmission
-
Bolt-in installation
-
Super premium heat treated and shot peened gears ensure race-tough strength and durability
-
Torque capacity increased by +25% over the Original Equipment transmission
-
Smooth gear engagement for quicker shifts
-
Back cut gears and shift lug/pockets undercut for improved engagement and reduced friction
-
Upgraded bearings
-
Screamin’ Eagle branding on bearing door
-
Requires Gasket Installation Kit (P/N 36300043), which includes gaskets, O-rings, main drive seal and bearing, and inner primary bearing race (sold separately)
Fits ’07-’24 Touring, ’07-’24 Softail® and ’06-’17 Dyna® models. Does not fit ’23-later Center-Cooled Touring models. Installation requires separate purchase of Gasket Installation Kit P/N 36300043. Installation on Twin Cam models requires reusing OEM shift drum and separate purchase of (2) Lock plate fasteners P/N 35259-06.
Installation Instructions
Sold Separately:
Gasket Installation Kit P/N 36300043
Sold In Units:
Each
In the Box:
King 6 Gear Set, Main drive gear assembly, installation instructions
WARRANTY:
1 year limited warranty – Go to www.h-d.com/warranty for full details
Notes:
Transmission gears and shafts may have a blue coating. This blue coating is an manufacturing aid and will not affect King 6 Transmission or Oil Performance. Upon first fluid change the oil may have a slight discoloration.
Key Features
- Genuine Screamin’ Eagle Racing performance transmission
- Six-speed transmission design
- Developed with Harley-Davidson Factory Race Team experience
- Torque capacity increased by 25% over the Original Equipment transmission
- Modified back-cut shift dogs for improved gear engagement
- Undercut shift lugs and pockets
- Heat-treated and shot-peened gears and shafts
- Upgraded bearings
- Screamin’ Eagle branding on the bearing door
- Designed for compatible Harley-Davidson Big Twin models
- One-year limited warranty
Enhanced Gear Engagement
The Screamin’ Eagle Racing King 6 Transmission is designed to deliver smoother gear engagement and support quicker shifts. Its modified back-cut angles on the shift dogs help improve engagement, while the undercut shift lugs and pockets are engineered to improve the interaction between transmission components and reduce friction during shifting.
These design features make the King 6 a performance-oriented option for riders who want a more robust transmission for demanding riding and engine configurations.
Built for High-Torque Applications
Harley-Davidson specifies a 25% increase in torque capacity compared with the Original Equipment transmission. The gears and shafts receive premium heat treatment and shot peening to help provide the strength and durability required for demanding performance use.
Upgraded bearings contribute to the transmission’s overall design, supporting smooth operation under load. These features are particularly relevant to riders building performance-oriented motorcycles or upgrading compatible drivetrain components.
Complete Transmission Assembly
The King 6 is supplied as a transmission assembly that includes the King 6 gear set and main drive gear assembly, along with installation instructions. It is designed as a bolt-in installation for listed compatible applications, although additional parts and model-specific procedures are required.
The Screamin’ Eagle Racing Gasket Installation Kit, Part Number 36300043, must be purchased separately. This kit includes gaskets, O-rings, the main drive seal and bearing, and the inner primary bearing race.
For 2006–2017 Twin Cam models, the Original Equipment shift drum must be reused and two additional lock plate fasteners, Part Number 35259-06, must be purchased separately.
Fitment and Installation
Harley-Davidson offers two versions of the Screamin’ Eagle Racing King 6 Transmission:
- Part Number 36300037: Fits 2007–2024 Touring, 2007–2024 Softail and 2006–2017 Dyna models. It does not fit 2023-later center-cooled Touring models.
- Part Number 36300041: Fits 2023-later center-cooled Touring models and 2025-later Softail models.
The transmission gears and shafts may have a blue manufacturing coating. Harley-Davidson states that this coating does not affect transmission or oil performance, although the oil may show slight discoloration after the first fluid change.
Transmission installation involves major drivetrain components and requires the correct service manual, tools and procedures. Professional installation by a qualified Harley-Davidson technician is recommended.
Before ordering, confirm your motorcycle’s exact model, year and transmission configuration. The correct transmission version and separately required installation components must be selected for your application.

Reviews
Clear filtersThere are no reviews yet.