Ford 9 in. 31 Spline Spool Nodular Iron Third Member Assembly Ratio:5.83:1 Their performance

Their performance

An internal divider optimizes flow distribution to all ports of the manifold by reducing turbulence

Pulleys can be replaced with pulleys of the same or different diameters

Designed for use with 1-1/8" diameter

and sludge

Ford 9 in. 31 Spline Spool Nodular Iron Third Member Assembly Ratio:5.83:1 Their performanceSpeedmaster Ford 9 in. third member assemblies are designed to help you get that horsepower to the ground. They include high quality nodular iron 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.