Product Details: Outer tube seal, presses in the inner "C" knuckle and seals the end of the axle tubes from dirt (1) seal per box. (2) seals required per axle. Parts Included: (1) seal Fits: 2005 - 2013 Ford Super Duty F-250 and F-350 with the Dana Super 60 front axle 2005 - 2013 Ford Super Duty F-450 and F-550 with the Dana Super 60 "Fat Boy" front axle Brand: Dana Spicer Part Number: Dana Spicer 53877 Warranty: 6 month warranty and case by case basis. Genuine Spicer light vehicle axle products are manufactured to the same high standards as original equipment (OE) parts because they are OE parts. That means when an automotive axle part is replaced with a genuine Spicer part, you are getting the same performance and reliability you have come to expect. And because Dana is constantly revolutionizing the technology behind its Dana axles and Spicer products, the replacement car axle or component you purchase today may even exceed the standards set for the original equipment part that you are replacing. Axle Model: DANA 60 Housing Bore (In): 3.54 Inside Diameter (In): 2.18 Material: RUBBER Oil Seal Included: Y O-Ring Included: N Outside Diameter (In): 3.48 Seal Type: GASKET Shaft Size (In): 2.37 Thickness (In): 0.7 Width (In): 0.74