{"product_id":"national-710577-differential-pinion-seal-rear-outer","title":"National 710577 Differential Pinion Seal - Rear Outer","description":"\u003ch2\u003eOverview\u003c\/h2\u003e\u003cp\u003eNational 710577 is a differential pinion seal built for driveline sealing service where precise dimensions and durable sealing material matter. It is specified for rear outer applications on select Ford heavy-duty platforms, including Ford F-350 Super Duty and Ford F-450 Super Duty fitments.\u003c\/p\u003e\u003ch2\u003eKey Features\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eFluoro-elastomer sealing material for resistance to heat and fluid exposure.\u003c\/li\u003e\n\u003cli\u003eMeasured to match the listed shaft, housing bore, and outside diameter dimensions.\u003c\/li\u003e\n\u003cli\u003eOil seal design for differential pinion sealing service.\u003c\/li\u003e\n\u003cli\u003eNational 710577 is part of the 710500 series.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eDetailed Description\u003c\/h2\u003e\u003cp\u003eThis National differential pinion seal is engineered around the listed dimensional specifications, including a 2.500-inch shaft size, 4.043-inch outside diameter, and 0.453-inch width. The fluoro-elastomer construction supports consistent sealing performance in demanding axle service, while the flanged profile and side-lip width help define the seal geometry for the intended application. For buyers searching for a Ford F-350 Super Duty rear outer differential pinion seal or a Ford F-450 Super Duty rear outer differential pinion seal, National 710577 provides a direct match to the published fitment and dimensions. This part cross-references SKF 24967A and Remy 25026 for the same application.\u003c\/p\u003e\u003ch2\u003eWhat It Is Used For\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eStopping gear oil seepage at the differential pinion area.\u003c\/li\u003e\n\u003cli\u003eReplacing a worn or hardened axle seal.\u003c\/li\u003e\n\u003cli\u003eAddressing fluid loss caused by seal wear or age.\u003c\/li\u003e\n\u003cli\u003eRestoring proper sealing after driveline service.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eInstallation Notes and Tips\u003c\/h2\u003e\u003cp\u003eInstall only on the listed rear outer applications and verify the axle note before ordering. Confirm the housing bore, shaft diameter, and seal width against the removed part before installation. Clean the sealing surface thoroughly and inspect the pinion area for wear that could affect seal life.\u003c\/p\u003e\u003ch2\u003eQuality Assurance\u003c\/h2\u003e\u003cp\u003eNational has supplied premium sealing solutions for more than 75 years and is recognized for sealing products used in automotive service applications. Part number 710577 reflects that sealing-focused product heritage.\u003c\/p\u003e","brand":"National","offers":[{"title":"Default Title","offer_id":53731295723701,"sku":"BCZK-710577","price":47.29,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0628\/1442\/1173\/files\/NS_710577_Ang.jpg?v=1794291231","url":"https:\/\/www.partcatalog.com\/products\/national-710577-differential-pinion-seal-rear-outer","provider":"PartCatalog","version":"1.0","type":"link"}