Main Shaft Bearing

The Richmond Main Shaft Bearing is a precision ball bearing engineered for input shaft support in Richmond 5-speed transmissions. With a 1.378-inch inner diameter and 3.145-inch outer diameter, this bearing maintains tight tolerances critical to smooth gear engagement and consistent shift quality. Designed as an original equipment replacement, it restores proper load distribution across the transmission's rotating components and prevents premature wear on adjacent gearbox surfaces.

Transmission bearing specifications directly impact gear mesh alignment and rotational smoothness. A worn or damaged main shaft bearing introduces axial play that forces gears out of optimal mesh, causing noise, vibration, and accelerated tooth degradation. This Richmond OEM bearing restores factory contact angles and load paths. At 1.1 pounds and dimensioned at 3.75 x 1.15 x 3.95 inches, the bearing integrates seamlessly into the 5-speed transmission case without requiring clearance modifications or grinding. Ball bearing construction provides superior speed capability and lower friction compared to roller designs, making it suitable for both street and moderate performance applications.

This bearing is essential for anyone rebuilding a Richmond 5-speed transmission or addressing input shaft runout issues. Technicians performing transmission overhauls rely on OEM bearings to ensure the final assembly meets original specifications for load capacity and durability. Whether replacing a single worn bearing during routine maintenance or completing a full gearbox rebuild, this Richmond bearing maintains the input shaft's axial and radial positioning—critical for long-term reliability in daily driven vehicles or performance platforms. Installation requires standard bearing press procedures and proper shaft preparation to achieve full service life.