SBF To C-4 Ultra-Bell W/157 Flexplate

The SBF To C-4 Ultra-Bell with 157 Flexplate is a precision transmission adapter assembly designed for engine swaps and high-performance drivetrain conversions. This adapter effectively connects Small Block Ford (SBF) engines to C-4 automatic transmissions, allowing for seamless integration of both modern and classic Ford powerplants with robust three-speed automatics. This product is ideal for automotive enthusiasts restoring vintage hot rods or building custom vehicles.

Engineered by J-W Performance, the ultra-bell design minimizes transmission tunnel clearance issues, which is crucial for tight engine compartments and vintage chassis. The included 157-tooth flexplate is precision-balanced to ensure reliable starter engagement and optimal driveline harmonics, making it compatible with the common 157-tooth ring gears found in Ford C-4 applications. The robust construction of this adapter accommodates the necessary mounting geometry and bolt patterns, ensuring a direct fit to the engine block without modification.

This adapter is particularly beneficial for engine builders, transmission specialists, and hot rod fabricators who are undertaking SBF-to-C-4 swaps in classic trucks, muscle cars, and custom vehicles. Its design maintains OEM-quality tolerances, which are essential for reliable performance on both the street and the strip. With this adapter, builders can achieve a professional-grade installation that meets the demands of high-performance applications.