{"product_id":"national-470774-automatic-transmission-extension-housing-seal","title":"National 470774 Automatic Transmission Extension Housing Seal","description":"\u003ch2\u003eOverview of National 470774 Automatic Transmission Extension Housing Seal\u003c\/h2\u003e\u003cp\u003eThe National 470774 automatic transmission extension housing seal is engineered to provide reliable sealing performance for select Buick and Cadillac models. Designed with precision, this oil seal helps maintain transmission integrity by preventing fluid leaks and contamination.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eInside diameter: 1.375 inches (34.930 mm)\u003c\/li\u003e\n\u003cli\u003eOutside diameter: 2.066 inches (52.480 mm)\u003c\/li\u003e\n\u003cli\u003eThickness\/width: 0.375 inches (9.530 mm)\u003c\/li\u003e\n\u003cli\u003eMaterial: Durable nitrile compound\u003c\/li\u003e\n\u003cli\u003eRedicoat coating for enhanced wear resistance\u003c\/li\u003e\n\u003cli\u003eCompatible with housing bore size 2.062 inches (52.370 mm)\u003c\/li\u003e\n\u003cli\u003eZero duplication part ensuring unique fit and quality\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eDetailed Product Description and Specifications\u003c\/h2\u003e\u003cp\u003eThis National automatic transmission extension housing seal, part number 470774, is manufactured from nitrile material known for its resistance to oil, heat, and wear. The seal features a 1.375-inch inside diameter and a 2.066-inch outside diameter, matching the housing bore dimensions precisely to ensure a secure fit. With a thickness of 0.375 inches, it provides a robust barrier against transmission fluid leaks. The Redicoat treatment enhances the seal’s durability by reducing friction and extending service life. This seal is part of National's 470000 series, designed specifically for automatic transmission applications requiring reliable sealing solutions.\u003c\/p\u003e\u003ch2\u003eCompatible Vehicles and Applications\u003c\/h2\u003e\u003cp\u003eThis transmission extension housing seal is compatible with various Buick and Cadillac models, including:\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eBuick Century\u003c\/li\u003e\n\u003cli\u003eBuick LeSabre\u003c\/li\u003e\n\u003cli\u003eCadillac DeVille\u003c\/li\u003e\n\u003cli\u003eCadillac Roadmaster\u003c\/li\u003e\n\u003cli\u003eBuick Skylark\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eIt is designed to replace worn or damaged seals in these vehicles’ automatic transmission extension housings, helping maintain proper fluid containment and transmission performance.\u003c\/p\u003e\u003ch2\u003eCommon Issues Addressed by National 470774 Seal\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003ePrevents automatic transmission fluid leaks from the extension housing\u003c\/li\u003e\n\u003cli\u003eReduces contamination ingress that can cause transmission wear\u003c\/li\u003e\n\u003cli\u003eEliminates noise and vibration caused by fluid loss or seal failure\u003c\/li\u003e\n\u003cli\u003eHelps maintain proper hydraulic pressure within the transmission\u003c\/li\u003e\n\u003cli\u003ePrevents premature transmission component damage due to fluid leakage\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eInstallation Notes and Tips\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eEnsure the housing bore is clean and free of debris before installation\u003c\/li\u003e\n\u003cli\u003eUse appropriate tools to avoid damaging the seal during installation\u003c\/li\u003e\n\u003cli\u003eVerify the seal orientation matches the original part for proper sealing\u003c\/li\u003e\n\u003cli\u003eLubricate the seal lip with transmission fluid to ease installation and prevent damage\u003c\/li\u003e\n\u003cli\u003eCheck for proper fit and seating after installation to avoid leaks\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eQuality Assurance and Warranty\u003c\/h2\u003e\u003cp\u003eNational transmission seals are manufactured to meet OEM specifications, ensuring consistent quality and performance. The 470774 seal undergoes rigorous testing for dimensional accuracy and material integrity. This part is backed by National’s quality standards and includes a limited warranty against manufacturing defects, providing confidence in its durability and reliability for Buick Century, Cadillac DeVille, and other compatible models.\u003c\/p\u003e","brand":"National","offers":[{"title":"Default Title","offer_id":43448299487413,"sku":"BCZK-470774","price":17.37,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0628\/1442\/1173\/files\/NS_470774_Fro_8b893e15-bac6-49f8-8bbc-9bbbf110a283.jpg?v=1774734657","url":"https:\/\/www.partcatalog.com\/products\/national-470774-automatic-transmission-extension-housing-seal","provider":"PartCatalog","version":"1.0","type":"link"}