Aluminum Drive Flange SB Ford

The Aluminum Drive Flange SB Ford by BRINN TRANSMISSION (Part Number 73033) is a precision crankshaft coupler engineered for small-block Ford V8 engines undergoing transmission conversion or performance upgrade. This 10-spline aluminum component serves as the critical mechanical interface between the engine's crankshaft and modern high-performance transmission systems, enabling seamless power transfer while maintaining strict tolerances required for reliable operation.

Manufactured in natural aluminum finish, this flange weighs 1.17 lbs and measures 5.35 x 3.75 x 5.55 inches, making it a compact yet robust solution for tight engine bay configurations. The 10-spline design provides positive engagement with both the crankshaft and transmission input shaft, eliminating slippage and ensuring repeatability across multiple shifts and load cycles. BRINN Transmissions engineered this coupling specifically for small-block Ford platforms—the industry-standard displacement range from 221 to 302 cubic inches—where precision fit-up directly impacts shift quality and drivetrain longevity.

This flange is essential for builders upgrading from original equipment automatic transmissions to modern manual, overdrive, or custom transmission systems. Whether installing a contemporary five-speed, six-speed, or specialty racing transmission in a classic hot rod, street machine, or performance vehicle, correct crankshaft coupling is non-negotiable. The aluminum construction balances weight savings with durability, while the machined spline profile guarantees compatibility with Ford small-block cranks across multiple generations of engine production.

Transmission conversion projects demand components engineered to OEM specifications. BRINN's aluminum drive flange represents the kind of precision hardware that separates amateur builds from professional-grade restorations and performance conversions, ensuring the drivetrain performs as intended without binding, runout, or premature wear.