9-Inch Third Member 3.89 Gear Ratio & 31-Spline

The 9-Inch Third Member 3.89 Gear Ratio & 31-Spline from Currie Enterprises is designed for off-road enthusiasts and performance builders who require dependable power delivery in challenging conditions. This differential assembly is a replacement for worn or inadequate rear-end components in vehicles that need enhanced torque handling and traction control.

Featuring a 3.89 gear ratio, this third member strikes a balance between acceleration and highway cruising efficiency, making it suitable for vehicles with larger tires or increased engine displacement. The robust 31-spline design ensures effective power transfer through the axle shafts, minimizing slip and maximizing grip during demanding situations. Currie's assembly is built with precision-machined internals and reinforced housing geometry, which are essential for preventing deflection under load and extending the lifespan of components.

This third member is ready to install and compatible with standard 9-inch mounting provisions found in various popular platforms. It is particularly beneficial for truck builds and dedicated trail rigs where stock differentials may struggle to handle increased power. Whether for competition or recreational use, this assembly provides a solid foundation for performance-driven applications.