{"product_id":"national-4674n-automatic-transmission-output-shaft-seal","title":"National 4674N Automatic Transmission Output Shaft Seal - Right","description":"\u003ch2\u003eOverview of National 4674N Automatic Transmission Output Shaft Seal\u003c\/h2\u003e\u003cp\u003eThe National 4674N automatic transmission output shaft seal is engineered to provide reliable sealing performance for select Buick, Cadillac, Oldsmobile, and Pontiac models. Designed with precision dimensions and durable materials, this seal helps maintain transmission fluid integrity and prevents leaks in critical drivetrain components.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eInside diameter: 1.605 inches (40.770 mm)\u003c\/li\u003e\n\u003cli\u003eOutside diameter: 2.804 inches (71.220 mm)\u003c\/li\u003e\n\u003cli\u003eFlanged outside diameter: 3.061 inches (77.750 mm)\u003c\/li\u003e\n\u003cli\u003eThickness: 0.364 inches (9.250 mm)\u003c\/li\u003e\n\u003cli\u003eBi-directional lip design for effective sealing\u003c\/li\u003e\n\u003cli\u003eConstructed from polyacrylate material for durability\u003c\/li\u003e\n\u003cli\u003eRedicoat surface treatment for enhanced wear resistance\u003c\/li\u003e\n\u003cli\u003eCompatible with housing bore diameter of 2.795 inches (71.000 mm)\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eTechnical Details and Material Specifications\u003c\/h2\u003e\u003cp\u003eThe National 4674N output shaft seal features a bi-directional helix lip design that ensures effective sealing against fluid leakage in both rotational directions. Its polyacrylate construction offers resistance to heat and transmission fluids, contributing to long service life. The seal’s precise dimensions, including a 1.605-inch inside diameter and a 2.804-inch outside diameter, make it suitable for specific automatic transmission output shafts. The Redicoat coating enhances the seal’s surface durability, reducing wear and extending operational reliability.\u003c\/p\u003e\u003ch2\u003eCompatible Vehicle Applications\u003c\/h2\u003e\u003cp\u003eThis automatic transmission output shaft seal is compatible with various GM vehicles, including Buick Allante and Lucerne, Cadillac DeVille, DTS, Eldorado, and Seville, Oldsmobile Aurora and Bonneville, and Pontiac models. The part number 4674N ensures proper fitment and function within these transmissions, maintaining fluid containment and preventing contamination.\u003c\/p\u003e\u003ch2\u003eCommon Issues Addressed by the 4674N Seal\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003ePrevents transmission fluid leaks from the output shaft area\u003c\/li\u003e\n\u003cli\u003eReduces risk of contamination entering the transmission system\u003c\/li\u003e\n\u003cli\u003eMinimizes wear on transmission components caused by fluid loss\u003c\/li\u003e\n\u003cli\u003eHelps maintain proper hydraulic pressure within the transmission\u003c\/li\u003e\n\u003cli\u003ePrevents premature transmission failure due to seal degradation\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eInstallation Notes and Tips\u003c\/h2\u003e\u003cp\u003eWhen installing the National 4674N output shaft seal, ensure the housing bore and shaft surfaces are clean and free of debris. Use appropriate tools to avoid damaging the seal lips during installation. Verify the seal orientation matches the bi-directional lip design for optimal sealing performance. Lubricate the seal with transmission fluid before installation to reduce initial wear. Confirm fitment compatibility with the specific Buick, Cadillac, Oldsmobile, or Pontiac model prior to installation.\u003c\/p\u003e\u003ch2\u003eQuality Assurance and Warranty Information\u003c\/h2\u003e\u003cp\u003eNational’s 4674N transmission output shaft seal is manufactured to meet industry standards for durability and performance. The use of polyacrylate material and Redicoat treatment ensures resistance to heat and fluid exposure. While specific warranty details may vary, National typically provides coverage against manufacturing defects to support product reliability and customer confidence.\u003c\/p\u003e","brand":"National","offers":[{"title":"Default Title","offer_id":43448202821813,"sku":"BCZK-4674N","price":15.12,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0628\/1442\/1173\/files\/NS_4674N_Ang.jpg?v=1774734523","url":"https:\/\/www.partcatalog.com\/products\/national-4674n-automatic-transmission-output-shaft-seal","provider":"PartCatalog","version":"1.0","type":"link"}