Designed as a direct upgrade for Harley-Davidson part numbers 8967A and 8970A, this Ceramic Transmission Housing Bearing Kit is engineered to support smooth, consistent operation in M8 and Twin Cam (6-speed) applications while handling the unique loads present at the trap door/countershaft interface. Featuring a durable deep-groove design with precision ceramic rolling elements, it helps maintain proper shaft alignment, promotes precise gear engagement, supports smoother gear transitions under load, and reduces friction, operating temperatures, and long-term wear compared to standard steel bearings. Ideal for both street riders and performance builds, it delivers enhanced drivetrain durability, strength, reliability, and service life where it matters most.
- Direct OEM replacement for 8967A and 8907A
- Set includes one (1) Main Drive bearing and two (2) Trap Door bearings
- Installation should be performed by a certified technician, referencing the H-D Factory Service Manual
- Quicker elapsed times and higher MPHs
- Ceramic bearings offer 40% less friction than steel
- Less friction = more horsepower
- 60% less rotating weight
- Low tension, maintenance-free dust seals
- Mobil® Polyrex® lightweight aerospace grease
- Bearing life 3 to 5 times longer than steel
- Lower vibration levels
- Cooler running
- No extra maintenance required
- 2-year warranty
- 100% hand assembled in the USA to exacting specifications
- Why Choose Worldwide Bearings? - Read More
- Worldwide Bearings Ceramic Ball Torture Testing (Video)
Worldwide Hybrid Ceramic Bearings
Speed starts with efficiency. Worldwide Hybrid Ceramic Bearings reduce friction and rotating mass where it matters most—delivering smoother operation, cooler running temperatures, and longer service life than traditional steel bearings. Built with SAE 52100 high-carbon chromium steel races and Grade 5 Silicon Nitride ceramic balls, they’re designed for serious street riders and proven performance builds alike. Finished with low-friction removable seals and backed by a 2-year warranty, these bearings are engineered to win.
