USA Standard Gear ring and pinion sets are designed to exceed OEM specification. All sets receive rigorous in-house quality evaluation to ensure products pass dimensional, material, and fitment testing. Cord 10.5 4.11 ratio Ring & Pinion Kit All USA Standard Gear ring and pinion sets come standard with a one-year warranty. Engineered for the Harshest Conditions Rear Features and Benefits: Cord 10.5 inch 4.11 ratio Ring & Pinion Kit All USA Standard Gear ring and pinion sets come standard with a one-year warranty. Engineered for the Harshest Conditions Rear Details: AAP UDA 4: 60 Application Summary: 2011-2015 Ford E-350 Super Duty (Rear) (Note: Ford 10.5 inch. Rear Ring & Pinion Set 4.11 Gear Ratio 37 Spline Pinion) 2011-2015 Ford E-450 Super Duty (Rear) (Note: Ford 10.5 inch. Rear Ring & Pinion Set 4.11 Gear Ratio 37 Spline Pinion) 2011-2014 Ford E-250 (Rear) (Note: Ford 10.5 inch. Rear Ring & Pinion Set 4.11 Gear Ratio 37 Spline Pinion) 2011-2019 Ford F-250 Super Duty (Rear) (Note: Ford 10.5 inch. Rear Ring & Pinion Set 4.11 Gear Ratio 37 Spline Pinion) 2011-2016 Ford F-350 Super Duty (Rear) (Drive: 4WD, Rwd / Note: Ford 10.5 inch. Rear Ring & Pinion Set 4.11 Gear Ratio 37 Spline Pinion)