Ford 9 in. 4in. 40 Spline Spool HD Pro Third Member Assembly Ratio:4.11:1 they feature a gold iridited

they feature a gold iridited finish for durability

reducing unwanted vibrations

oil leaks and producing 50% more spark than stock

Ensure consistent transmission performance with a Speedmaster oil pressure regulator

Tough nylon fabric is then bonded to the tooth surface for greater wear resistance

Ford 9 in. 4in. 40 Spline Spool HD Pro Third Member Assembly Ratio:4.11:1 they feature a gold iriditedSpeedmaster Ford 9 in. third member assemblies are designed to help you get that horsepower to the ground. They include aluminumn thru bolt design center section, as well as a forged chromoly steel spool, 1350 series yoke, daytona pinion support, and gear ratio. Whether you're assembling a daily driver, street rod, or race car, Speedamster's third member assemblies will provide the durability that your vehicle deserves.