{"product_id":"national-387as-axle-differential-bearing","title":"National 387AS Axle Differential Bearing - Front Inner, Rear or Rear Inner","description":"\u003ch2\u003eOverview of National 387AS Axle Differential Bearing\u003c\/h2\u003e\u003cp\u003eThe National 387AS axle differential bearing is engineered for reliable driveline performance in a variety of vehicles including Chevrolet, Dodge, Ford, GMC, Mercedes-Benz, and Ram models. This taper bearing cone is designed to meet precise specifications, ensuring proper fit and function in axle differentials.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eBrand: National\u003c\/li\u003e\n\u003cli\u003ePart Number: 387AS\u003c\/li\u003e\n\u003cli\u003eCategory: Driveline and Axles \u0026gt; Bearings\u003c\/li\u003e\n\u003cli\u003ePart Type: Axle Differential Bearing (Taper Bearing Cone)\u003c\/li\u003e\n\u003cli\u003eCone Bore Diameter: 2.2500 inches (57.15 mm)\u003c\/li\u003e\n\u003cli\u003eCone Length: 0.8640 inches (21.946 mm)\u003c\/li\u003e\n\u003cli\u003eCone Radius: 0.2030 inches (5.156 mm)\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eTechnical Specifications and Design Details\u003c\/h2\u003e\u003cp\u003eThe National 387AS bearing cone features a cone bore diameter of 2.2500 inches (57.15 mm), which is critical for proper seating on the axle shaft. Its cone length measures 0.8640 inches (21.946 mm), providing the necessary surface area for load distribution within the differential assembly. The cone radius of 0.2030 inches (5.156 mm) supports smooth rotation and reduces friction during operation. This taper bearing cone is manufactured to meet OEM standards, ensuring compatibility and durability across multiple vehicle platforms.\u003c\/p\u003e\u003ch2\u003eCompatible Vehicles and Applications\u003c\/h2\u003e\u003cp\u003eThis axle differential bearing is compatible with a wide range of vehicles, including Chevrolet Silverado 2500 HD, GMC Sierra 2500, Ford F-250 Super Duty, Dodge Ram 1500, and Mercedes-Benz 300SD models. It is suitable for use in axle differentials of trucks, SUVs, and passenger cars such as the Chevrolet Avalanche 2500, Ford E-350 Econoline, and Mercedes-Benz CL500. The National 387AS bearing supports driveline components in both light and heavy-duty applications.\u003c\/p\u003e\u003ch2\u003eCommon Issues Addressed by National 387AS Bearing\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eEliminates excessive play or looseness in the axle differential\u003c\/li\u003e\n\u003cli\u003eReduces noise and vibration caused by worn or damaged bearings\u003c\/li\u003e\n\u003cli\u003ePrevents premature wear of axle shafts and differential gears\u003c\/li\u003e\n\u003cli\u003eRestores smooth rotation and proper alignment within the differential\u003c\/li\u003e\n\u003cli\u003eImproves overall driveline reliability and performance\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eInstallation Notes and Tips\u003c\/h2\u003e\u003cp\u003eProper installation of the National 387AS axle differential bearing requires careful cleaning of the bearing seat and axle shaft. Use appropriate tools to press the bearing cone onto the axle shaft without causing damage. Verify the cone bore and length dimensions to ensure correct fitment. It is recommended to inspect related components such as races and seals during installation to maintain optimal driveline function.\u003c\/p\u003e\u003ch2\u003eQuality Assurance and Warranty Information\u003c\/h2\u003e\u003cp\u003eNational bearings are manufactured to meet stringent quality standards, providing consistent performance and durability. The 387AS axle differential bearing undergoes rigorous testing to ensure dimensional accuracy and material integrity. While specific warranty details may vary, National typically offers coverage against manufacturing defects to support long-term reliability in automotive applications.\u003c\/p\u003e","brand":"National","offers":[{"title":"Default Title","offer_id":43446458974389,"sku":"BCZK-387AS","price":31.47,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0628\/1442\/1173\/files\/NS_387AS_Ang_465d0e82-648e-416b-96d8-65952e7cfd5d.jpg?v=1774734492","url":"https:\/\/www.partcatalog.com\/products\/national-387as-axle-differential-bearing","provider":"PartCatalog","version":"1.0","type":"link"}