9in Gear Full Spool 6.50 Ratio New Center Section

The PEM 9in Gear Full Spool 6.50 Ratio New Center Section (CSFS65031) is a heavy-duty differential case assembly engineered for Ford 9-inch rear axles requiring maximum traction and load-carrying capability. This assembled center section features a steel spur gear spool designed for vehicles that demand aggressive power delivery and minimal slip under extreme driving conditions, making it essential for off-road recovery operations, high-performance off-road platforms, and duty vehicles operating in demanding terrain.

Built with a 6.50 gear ratio and 31-spline configuration, this differential case assembly translates engine torque directly to both rear wheels via the steel spool, eliminating the speed differential that standard open differentials allow. The 6.50 ratio delivers aggressive acceleration and climbing power—critical for vehicles extracting themselves from deep mud, sand, or rocky obstacles. The 31-spline design provides robust engagement and load distribution across high-torque applications. At 73.7 lbs and measuring 15.5 x 15.5 x 20.5 inches, this is a complete, factory-assembled unit requiring only proper installation into a compatible 9-inch carrier.

This center section serves operators, first responders, and serious enthusiasts running modified Ford 9-inch axles in tactical vehicles, emergency response platforms, or dedicated off-road rigs. The spool configuration eliminates the tire-killing torque vectoring of open differentials during tight maneuvers while providing the certainty of full power delivery in extraction scenarios. Builders and technicians choose PEM differential assemblies for their engineering precision and field-proven durability in extreme-use environments.