Ball Spline Front Seal

The Ball Spline Front Seal (Model 3-15-B) from BERT TRANSMISSIONS is a precision input shaft seal engineered for race and high-performance ball spline tailshaft housings. This component prevents fluid leakage at the critical interface where the input shaft meets the transmission housing, making it essential for builders and mechanics restoring or upgrading performance transmissions. Whether you're assembling a street rod, drag racing platform, or rebuilding a vintage hot rod, this seal protects your investment by maintaining transmission fluid integrity under demanding conditions.

Constructed from a durable rubber-to-steel composite, the Ball Spline Front Seal combines elastomer sealing properties with steel reinforcement to withstand the rotational forces and pressure cycles inherent in performance transmission operation. The ball spline design geometry requires a precisely fitted seal that accommodates both radial and axial loads without compromising the spline engagement. Weighing just 0.06 lbs and measuring 2.9 × 0.65 × 3.05 inches, this compact seal integrates seamlessly into BERT transmission housings while maintaining the tight tolerances necessary for zero-slip performance. The rubber composition resists heat cycling and fluid degradation, extending service life even in elevated-temperature racing environments.

Transmission builders, restoration shops, and performance enthusiasts rely on this OEM-equivalent seal when servicing BERT ball spline tailshaft housings. Installation requires careful alignment with the input shaft during assembly to prevent damage to the sealing lip. This seal is compatible exclusively with BERT transmission housings featuring ball spline input shafts and should be replaced during any full transmission rebuild or when evidence of fluid weeping appears around the input shaft area. Stock this component for any serious transmission rebuild project targeting maximum reliability and leak-free performance.