{"product_id":"national-3638-manual-transmission-input-shaft-seal","title":"National 3638 Manual Transmission Input Shaft Seal","description":"\u003ch2\u003eOverview of National Manual Transmission Input Shaft Seal 3638\u003c\/h2\u003e\u003cp\u003eThe National 3638 manual transmission input shaft seal is engineered to provide reliable sealing performance for a variety of vehicles including Buick, Chevrolet, Dodge, Ford, GMC, Jeep, Mercury, Oldsmobile, and Pontiac models. Designed with a polyacrylate material and a clockwise-spiral lip design, this oil seal helps maintain transmission integrity by preventing fluid leaks and contamination.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eMaterial: Durable polyacrylate for effective sealing\u003c\/li\u003e\n\u003cli\u003eInside Diameter: 1.125 inches (28.580 mm)\u003c\/li\u003e\n\u003cli\u003eOutside Diameter: 1.628 inches (41.350 mm)\u003c\/li\u003e\n\u003cli\u003eThickness: 0.190 inches (4.830 mm)\u003c\/li\u003e\n\u003cli\u003eClockwise-spiral lip design for enhanced sealing\u003c\/li\u003e\n\u003cli\u003eRedicoat surface treatment for corrosion resistance\u003c\/li\u003e\n\u003cli\u003eCompatible with multiple makes and models including Ford Bronco, Chevrolet C10, Jeep Cherokee, and Pontiac Bonneville\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eTechnical Details and Specifications\u003c\/h2\u003e\u003cp\u003eThe National 3638 input shaft seal is part of the 3000 series and features a 48 type design optimized for manual transmissions. Its polyacrylate construction offers resistance to heat and wear, ensuring long service life. The seal’s inside diameter measures 1.125 inches (28.580 mm), fitting shafts of the same size, while the outside diameter is 1.628 inches (41.350 mm), matching housing bores of approximately 1.624 inches (41.250 mm). The thickness of 0.190 inches (4.830 mm) provides a secure fit without compromising flexibility. The clockwise-spiral lip design improves sealing efficiency by directing fluid back into the transmission, reducing leakage risks.\u003c\/p\u003e\u003ch2\u003eCompatible Vehicles and Applications\u003c\/h2\u003e\u003cp\u003eThis manual transmission input shaft seal is compatible with a wide range of vehicles, including but not limited to:\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eBuick LeMans, Skylark, and Riviera\u003c\/li\u003e\n\u003cli\u003eChevrolet C10, C1500, and Suburban models\u003c\/li\u003e\n\u003cli\u003eDodge Ramcharger and D-series trucks\u003c\/li\u003e\n\u003cli\u003eFord Bronco, F-150, and Econoline vans\u003c\/li\u003e\n\u003cli\u003eGMC Sierra and Jimmy\u003c\/li\u003e\n\u003cli\u003eJeep Cherokee, CJ5, and CJ7\u003c\/li\u003e\n\u003cli\u003eMercury Cougar and Marauder\u003c\/li\u003e\n\u003cli\u003eOldsmobile Delta 88 and Cutlass\u003c\/li\u003e\n\u003cli\u003ePontiac Bonneville and Grand Prix\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eCommon Issues Addressed by National 3638 Seal\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003ePrevents manual transmission fluid leaks around the input shaft\u003c\/li\u003e\n\u003cli\u003eReduces contamination from dirt and debris entering the transmission\u003c\/li\u003e\n\u003cli\u003eMinimizes wear on transmission components by maintaining proper lubrication\u003c\/li\u003e\n\u003cli\u003eHelps avoid costly transmission repairs due to seal failure\u003c\/li\u003e\n\u003cli\u003eMaintains optimal transmission performance and longevity\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eInstallation Notes and Tips\u003c\/h2\u003e\u003cp\u003eWhen installing the National 3638 input shaft seal, ensure the following for proper fitment and function:\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eClean the housing bore and shaft thoroughly before installation\u003c\/li\u003e\n\u003cli\u003eInspect the shaft for wear or damage that could affect sealing\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 lip orientation matches the clockwise-spiral design direction\u003c\/li\u003e\n\u003cli\u003eApply a light coating of transmission fluid or compatible lubricant to the seal lip before installation\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eQuality Assurance and Warranty\u003c\/h2\u003e\u003cp\u003eNational’s 3638 input shaft seal is manufactured to meet industry standards for durability and performance. The Redicoat treatment enhances corrosion resistance, extending the seal’s service life. While specific warranty terms may vary, National typically offers coverage against manufacturing defects to ensure customer confidence in the product’s reliability.\u003c\/p\u003e","brand":"National","offers":[{"title":"Default Title","offer_id":43448185651381,"sku":"BCZK-3638","price":21.08,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0628\/1442\/1173\/files\/NS_3638_Fro_0498cd1f-8dad-4a3c-a880-f113d4d08137.jpg?v=1774734512","url":"https:\/\/www.partcatalog.com\/products\/national-3638-manual-transmission-input-shaft-seal","provider":"PartCatalog","version":"1.0","type":"link"}