{"product_id":"national-3404-automatic-transmission-oil-pump-seal","title":"National 3404 Automatic Transmission Oil Pump Seal - Front","description":"\u003ch2\u003eOverview of National 3404 Automatic Transmission Oil Pump Seal\u003c\/h2\u003e\u003cp\u003eThe National 3404 automatic transmission oil pump seal is engineered to provide reliable sealing performance for select Ford, Lincoln, and Mercury vehicles. Designed with durable silicone material and a clockwise-spiral lip design, this oil seal helps maintain transmission fluid integrity and prevent leaks.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eInside diameter options: 1.996 inch (50.7 mm)\u003c\/li\u003e\n\u003cli\u003eOutside diameter: 2.751 inch (69.88 mm)\u003c\/li\u003e\n\u003cli\u003eFlanged outside diameter: 3.020 inch (76.71 mm)\u003c\/li\u003e\n\u003cli\u003eThickness: 0.325 inch (8.26 mm)\u003c\/li\u003e\n\u003cli\u003eSealing material: Silicone with clockwise-spiral lip design\u003c\/li\u003e\n\u003cli\u003eCompatible with housing bore diameter of 2.743 inch (69.67 mm)\u003c\/li\u003e\n\u003cli\u003ePart number: 3404, Series 3000\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eTechnical Details and Material Specifications\u003c\/h2\u003e\u003cp\u003eThis National 3404 oil seal is constructed from high-quality silicone, chosen for its resistance to heat, wear, and transmission fluids. The clockwise-spiral lip design enhances sealing efficiency by maintaining consistent contact with the shaft, which measures 1.996 inches (50.7 mm) in diameter. The seal’s flanged outside diameter of 3.020 inches (76.71 mm) ensures a secure fit within the transmission housing bore of 2.743 inches (69.67 mm). With a thickness of 0.325 inches (8.26 mm), this seal balances durability and flexibility to accommodate dynamic transmission conditions.\u003c\/p\u003e\u003ch2\u003eCompatible Vehicles and Applications\u003c\/h2\u003e\u003cp\u003eThe National 3404 automatic transmission oil pump seal is compatible with a range of Ford, Lincoln, and Mercury models, including but not limited to:\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eFord F-150, F-250, F-350, Expedition, Explorer, Mustang, Bronco, and E-Series Econoline vans\u003c\/li\u003e\n\u003cli\u003eLincoln Town Car, Navigator, Mark LT, Mark VIII, and Blackwood\u003c\/li\u003e\n\u003cli\u003eMercury Cougar, Grand Marquis, Marauder, Mountaineer, and Cougar\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eThis part is specifically designed for use in automatic transmission oil pumps, ensuring proper sealing and fluid retention in these vehicles.\u003c\/p\u003e\u003ch2\u003eCommon Issues Addressed by the National 3404 Seal\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003ePrevents transmission fluid leaks that can cause low fluid levels and transmission damage\u003c\/li\u003e\n\u003cli\u003eReduces contamination ingress into the transmission system\u003c\/li\u003e\n\u003cli\u003eMaintains hydraulic pressure within the automatic transmission oil pump\u003c\/li\u003e\n\u003cli\u003eMinimizes premature wear of transmission components due to fluid loss\u003c\/li\u003e\n\u003cli\u003eHelps avoid costly transmission repairs related to seal failure\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eInstallation Notes and Tips\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eEnsure the transmission housing bore and shaft are clean and free of debris before installation\u003c\/li\u003e\n\u003cli\u003eUse appropriate tools to press the seal evenly into the housing bore without distortion\u003c\/li\u003e\n\u003cli\u003eVerify the seal’s orientation matches the clockwise-spiral lip design for optimal sealing\u003c\/li\u003e\n\u003cli\u003eInspect the shaft for wear or damage that could compromise the seal’s effectiveness\u003c\/li\u003e\n\u003cli\u003eConsult vehicle-specific service manuals for torque specifications and installation procedures\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eQuality Assurance and Warranty Information\u003c\/h2\u003e\u003cp\u003eNational’s 3404 automatic transmission oil pump seal is manufactured to meet industry standards for durability and performance. The silicone material and design features provide reliable sealing under typical operating conditions. While specific warranty details may vary, National products generally come with a limited warranty against manufacturing defects. It is recommended to verify warranty coverage with the supplier or manufacturer documentation.\u003c\/p\u003e","brand":"National","offers":[{"title":"Default Title","offer_id":43448184668341,"sku":"BCZK-3404","price":20.14,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0628\/1442\/1173\/files\/NS_3404_Fro_de90e550-ffc0-4987-9809-cb10e947bf65.jpg?v=1774734510","url":"https:\/\/www.partcatalog.com\/products\/national-3404-automatic-transmission-oil-pump-seal","provider":"PartCatalog","version":"1.0","type":"link"}