Needle Roller Ball Spline

The Needle Roller Ball Spline (BERT TRANSMISSIONS model SG-1504) is a precision transmission bearing engineered for high-performance manual transmission applications, particularly in Bert ball spline tailhousing assemblies. This component serves as a critical load-bearing element in racing and modified street transmissions where reliability under extreme conditions is non-negotiable. Mechanics and transmission builders rely on needle roller bearings like this to handle the radial and axial forces generated during hard acceleration, downshifting, and sustained high-RPM operation.

Needle roller bearings distribute loads across multiple small cylindrical rollers, offering superior radial load capacity in a compact footprint compared to ball bearings alone. With an inner diameter of 2.064 inches and outer diameter of 2.560 inches, this bearing is dimensionally optimized for tailhousing mounting in Bert transmission assemblies. The spline design allows axial movement while maintaining rotational precision, reducing backlash and vibration that can compromise shift quality or accelerate wear on adjacent components. The 0.5 lb weight reflects the dense steel construction required to withstand transmission pressures and shock loads common in performance driving.

This bearing is essential for builders constructing or rebuilding Bert ball spline transmissions used in drag racing, road racing, and high-horsepower street vehicles. The tailhousing position makes it susceptible to wear during extended use, particularly in applications with aggressive launch characteristics or high lateral g-forces. Proper installation with correct preload and lubrication ensures maximum bearing life and transmission reliability, making this component a worthwhile investment during any transmission overhaul or upgrade. Direct replacement ensures OEM-level fit and function without modification to the tailhousing assembly.