{"product_id":"national-710771-transfer-case-output-shaft-seal","title":"National 710771 Transfer Case Output Shaft Seal - Rear","description":"\u003ch2\u003eNational Transfer Case Output Shaft Seal Overview\u003c\/h2\u003e\u003cp\u003eThe National 710771 transfer case output shaft seal is engineered to provide reliable sealing performance for select Chevrolet, Dodge, and GMC trucks and SUVs. Designed with durable PTFE material and a bi-directional lip design, this oil seal helps maintain transfer case integrity by preventing fluid leaks and contamination.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eInside diameter options: 2.185 inches (55.5 mm)\u003c\/li\u003e\n\u003cli\u003eOutside diameter: 3.020 inches (76.7 mm)\u003c\/li\u003e\n\u003cli\u003eFlanged outside diameter: 3.543 inches (90 mm)\u003c\/li\u003e\n\u003cli\u003eThickness: 0.465 inches (11.8 mm)\u003c\/li\u003e\n\u003cli\u003eMaterial: PTFE for enhanced wear resistance\u003c\/li\u003e\n\u003cli\u003eBi-directional helix lip design for effective sealing\u003c\/li\u003e\n\u003cli\u003eCompatible with housing bore of 3.016 inches (76.6 mm)\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eTechnical Details and Specifications\u003c\/h2\u003e\u003cp\u003eThis National transfer case output shaft seal (part number 710771) features a PTFE sealing material known for its chemical resistance and low friction properties. The seal’s bi-directional lip design ensures effective sealing against oil leaks in both rotational directions, which is critical for transfer case output shafts. With an overall width of 1.406 inches (35.72 mm) including the side lip, it fits precisely within the housing bore diameter of 3.016 inches (76.6 mm). The flanged outside diameter of 3.543 inches (90 mm) provides secure mounting and stability during operation.\u003c\/p\u003e\u003ch2\u003eCompatible Vehicles and Applications\u003c\/h2\u003e\u003cp\u003eThis transfer case output shaft seal is compatible with a range of Chevrolet, Dodge, and GMC models, including:\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eChevrolet Avalanche 1500 and 2500\u003c\/li\u003e\n\u003cli\u003eDodge Ram 2500 and 3500\u003c\/li\u003e\n\u003cli\u003eGMC Sierra 1500, 1500 Classic, 1500 HD, 1500 HD Classic, 2500, 2500 HD, 2500 HD Classic, 3500, 3500 Classic, 3500 HD\u003c\/li\u003e\n\u003cli\u003eGMC Silverado 1500, 1500 Classic, 1500 HD, 1500 HD Classic, 2500, 2500 HD, 2500 HD Classic, 3500, 3500 Classic, 3500 HD\u003c\/li\u003e\n\u003cli\u003eGMC Suburban 1500 and 2500, Tahoe, Yukon, Yukon XL 1500, Yukon XL 2500\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eCommon Issues Addressed by This Seal\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003ePrevents transfer case fluid leaks that can cause drivetrain damage\u003c\/li\u003e\n\u003cli\u003eReduces contamination ingress to protect internal components\u003c\/li\u003e\n\u003cli\u003eMinimizes wear on the output shaft by maintaining proper lubrication\u003c\/li\u003e\n\u003cli\u003eHelps maintain transfer case pressure and performance\u003c\/li\u003e\n\u003cli\u003eEliminates noise and vibration caused by fluid loss or seal failure\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 proper tools to avoid damaging the PTFE seal lip during installation\u003c\/li\u003e\n\u003cli\u003eVerify correct orientation of the bi-directional lip for optimal sealing\u003c\/li\u003e\n\u003cli\u003eCheck shaft surface for wear or damage prior to seal replacement\u003c\/li\u003e\n\u003cli\u003eApply a light coat of transfer case fluid to the seal lip before installation\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eQuality Assurance and Warranty\u003c\/h2\u003e\u003cp\u003eNational transfer case output shaft seals are manufactured to meet OEM specifications for durability and fitment. The PTFE material and bi-directional lip design provide consistent sealing performance under demanding conditions. Part number 710771 is backed by National’s quality standards, ensuring reliable operation when installed according to guidelines.\u003c\/p\u003e","brand":"National","offers":[{"title":"Default Title","offer_id":43448365973685,"sku":"BCZK-710771","price":36.55,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0628\/1442\/1173\/files\/NS_710771_Fro_eceaaf55-2085-4556-93c5-ee0562fdb331.jpg?v=1774734791","url":"https:\/\/www.partcatalog.com\/products\/national-710771-transfer-case-output-shaft-seal","provider":"PartCatalog","version":"1.0","type":"link"}