{"product_id":"national-hm89249-differential-pinion-bearing","title":"National HM89249 Differential Pinion Bearing - Front Inner, Rear Inner or Rear Outer","description":"\u003ch2\u003eOverview of National HM89249 Differential Pinion Bearing\u003c\/h2\u003e\u003cp\u003eThe National HM89249 differential pinion bearing is engineered for reliable driveline performance in a variety of vehicles including Buick, Chevrolet, GMC, and more. Designed as a taper bearing cone, this part ensures smooth differential operation and durability under demanding conditions.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eCompatible with multiple makes such as Buick, Cadillac, Chevrolet, Dodge, GMC, Honda, Hummer, Isuzu, Mitsubishi, Oldsmobile, and Pontiac\u003c\/li\u003e\n\u003cli\u003eFits models including Astro, Blazer, Camaro, Colorado, Escalade, Impala, Silverado 1500, Tahoe, Yukon XL, and others\u003c\/li\u003e\n\u003cli\u003eCone bore diameter of 1.4375 inches (36.513 mm) for precise fitment\u003c\/li\u003e\n\u003cli\u003eCone length measures 1.1350 inches (28.829 mm) ensuring proper seating\u003c\/li\u003e\n\u003cli\u003eCone radius of 0.1400 inches (3.556 mm) designed for optimal load distribution\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eTechnical Specifications and Features\u003c\/h2\u003e\u003cp\u003eThe HM89249 is a taper bearing cone specifically designed for differential pinion applications. Its cone bore diameter of 1.4375 inches (36.513 mm) allows for accurate alignment within the differential assembly. The cone length of 1.1350 inches (28.829 mm) provides the necessary surface area for load support, while the cone radius of 0.1400 inches (3.556 mm) helps reduce stress concentrations during operation. These precise dimensions contribute to the bearing's ability to maintain smooth rotation and reduce wear over time.\u003c\/p\u003e\u003ch2\u003eApplications and Problem Solving\u003c\/h2\u003e\u003cp\u003eThis differential pinion bearing is compatible with a wide range of vehicles, including Chevrolet Silverado 1500, GMC Yukon XL, Buick LeSabre, and Pontiac Grand Prix, among others. It is designed to address common driveline issues such as:\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eExcessive differential noise due to worn bearings\u003c\/li\u003e\n\u003cli\u003eVibration or roughness in the driveline assembly\u003c\/li\u003e\n\u003cli\u003ePremature bearing wear caused by improper fitment\u003c\/li\u003e\n\u003cli\u003eReduced differential efficiency impacting vehicle handling\u003c\/li\u003e\n\u003cli\u003ePotential damage to pinion gears from bearing failure\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eInstallation Notes and Tips\u003c\/h2\u003e\u003cp\u003eWhen installing the National HM89249 differential pinion bearing, ensure the following for optimal performance:\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eVerify the cone bore diameter matches the pinion shaft specifications\u003c\/li\u003e\n\u003cli\u003eUse proper tools to press the bearing cone into place without damage\u003c\/li\u003e\n\u003cli\u003eApply recommended lubricants to reduce initial wear\u003c\/li\u003e\n\u003cli\u003eCheck for correct preload and bearing clearance during assembly\u003c\/li\u003e\n\u003cli\u003eInspect mating components for wear or damage before installation\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eQuality Assurance and Warranty\u003c\/h2\u003e\u003cp\u003eNational bearings are manufactured to meet strict quality standards, ensuring durability and consistent performance in automotive driveline applications. The HM89249 part number undergoes rigorous testing to comply with OEM specifications. While specific warranty details may vary, National typically offers coverage against manufacturing defects to provide confidence in product reliability.\u003c\/p\u003e","brand":"National","offers":[{"title":"Default Title","offer_id":43450615431349,"sku":"BCZK-HM89249","price":48.23,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0628\/1442\/1173\/files\/NS_HM89249_Ang.jpg?v=1774734845","url":"https:\/\/www.partcatalog.com\/products\/national-hm89249-differential-pinion-bearing","provider":"PartCatalog","version":"1.0","type":"link"}