Pinion Flange 03-04 Cobra

The Pinion Flange 03-04 Cobra is a heavy-duty round companion flange designed for the 2003–2004 Ford Mustang Cobra's independent rear suspension system. This component is essential for owners performing differential service, rebuilds, or upgrades on one of the most iconic performance Mustangs ever produced. Whether replacing a worn flange during routine maintenance or supporting a complete IRS overhaul, this part ensures proper torque transmission between the driveshaft and the differential pinion gear.

Manufactured to meet OEM specifications, the pinion flange features the correct spline count and bolt pattern required for the 2003–2004 Cobra's rear end assembly. Its design is intended to handle the torque output of the 4.6L DOHC supercharged V8 engine, which produces over 390 horsepower in stock form. Precision machining and proper material composition ensure minimal runout and reliable sealing when paired with a new pinion seal, critical factors that prevent costly differential fluid leakage and component wear.

Enthusiasts and professional technicians rebuilding or servicing 03–04 Cobra rear differentials depend on this flange to restore original functionality and durability. Installation requires proper yoke removal, seal replacement, and adherence to torque specifications outlined in Ford service literature, making it a critical component of any IRS overhaul. This part guarantees fitment for the 2003-2004 Mustang Cobra, ensuring compatibility and performance.