Ford 9 in. 31 Spline Spool Nodular Iron Third Member Assembly Ratio:3.00:1 They accurately measure camshaft centerline

They accurately measure camshaft centerline

lower control arm mounts

thanks to its exceptional race-proven performance both on and off the track

which is much stronger than stock steel and mates better with an aluminum case

Try using Speedmaster steel crankshaft pulleys to increase horsepower and reduce accessory drag

Ford 9 in. 31 Spline Spool Nodular Iron Third Member Assembly Ratio:3.00:1 They accurately measure camshaft centerlineSpeedmaster 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.