Speedmaster 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 our famous TorqueWorm geared limited slip differential, 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.