{"product_id":"national-wheel-seal-380003a-for-medium-duty-trucks-ptfe-triple-barrier-low-friction","title":"National Wheel Seal 380003A for Medium-Duty Trucks — PTFE Triple-Barrier, Low-Friction","description":"\u003cp\u003e\u003cstrong\u003eThe National 380003A Wheel Seal is a heavy-duty replacement seal engineered with a PTFE compound and triple-barrier design to protect commercial truck wheel ends from debris and extreme temperatures.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eBuilt by National—an established name in sealing technology for over seven decades—the 380003A is designed for demanding on-road use. Its materials and patented lip geometry address the stresses wheel bearings encounter, offering low friction, broad temperature tolerance, and compatibility with mixed lubricants. Use this seal where reliable exclusion of dirt, water, and road contaminants is essential for longer service intervals.\u003c\/p\u003e\n\n\u003ch3\u003eWhat vehicles and wheel ends does this seal fit?\u003c\/h3\u003e\n\u003cp\u003eThe 380003A is intended for a range of medium-duty commercial trucks. Check fitment carefully against year, make, and model before purchase; some listings include special fit notes. Always confirm with your vehicle's specifications or the seller's fitment tool to ensure correct application.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eCompatible with Isuzu FTR, FVR, HTR, HVR models (various years 1995–2011 depending on model)\u003c\/li\u003e\n  \u003cli\u003eFits Chevrolet Kodiak and T-series models (C6500, C7500, T6500, T7500) from late 1990s through 2009\u003c\/li\u003e\n  \u003cli\u003eAlso listed for GMC C6500 TopKick models (2003–2009)\u003c\/li\u003e\n  \u003cli\u003eConfirm using the vendor’s ‘‘Amazon Confirmed Fit’’ bar and any qualifier notes\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow does the seal’s construction benefit wheel-end performance?\u003c\/h3\u003e\n\u003cp\u003eThe 380003A combines a proprietary PTFE-based compound with a three-layer barrier to reduce wear and keep contaminants out. Its low-friction material helps lower operating temperatures and resist degradation from mixed lubricants, while the bi-directional sealing lip adapts to movement at the wheel end.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eTriple barrier system improves exclusion of dirt and moisture\u003c\/li\u003e\n  \u003cli\u003ePTFE compound tolerates -100°F to 450°F (-73°C to 232°C)\u003c\/li\u003e\n  \u003cli\u003eLow friction minimizes drag and heat buildup on bearings\u003c\/li\u003e\n  \u003cli\u003ePatented lay-down lip increases contact surface during wheel movement\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhy choose this National Gold 38 Series seal over generic alternatives?\u003c\/h3\u003e\n\u003cp\u003eNational’s Gold 38 Series uses advanced materials and a patented lip design tailored for heavy-duty wheel ends, offering a balance of durability and compatibility. Unlike basic replacement seals, this design aims to handle temperature extremes and mixed lubricant environments common in commercial fleets.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eGold 38 Series signifies enhanced material technology and engineering\u003c\/li\u003e\n  \u003cli\u003eDesigned to withstand extreme temperature swings and harsh road conditions\u003c\/li\u003e\n  \u003cli\u003eEngineered to work with a range of lubricants without rapid breakdown\u003c\/li\u003e\n  \u003cli\u003ePatented features provide a more reliable sealing surface under load\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow should I verify fit and install this seal correctly?\u003c\/h3\u003e\n\u003cp\u003eBefore ordering, gather your vehicle year, make, model, engine, and trim to use the fitment tool or the seller’s confirmed-fit information. Proper installation requires clean mating surfaces, correct orientation of the sealing lip, and the appropriate press tool to avoid damage.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eUse vehicle specifics and the seller’s ‘‘Confirm Fit’’ tool to verify compatibility\u003c\/li\u003e\n  \u003cli\u003eInspect hub and bearing surfaces; clean and dress as needed before assembly\u003c\/li\u003e\n  \u003cli\u003ePress the seal squarely without tilting; avoid hammering the lip edge\u003c\/li\u003e\n  \u003cli\u003eFollow torque and reassembly steps per manufacturer guidance\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for: The National 380003A is aimed at fleet managers, commercial truck owners, and professional technicians who need a durable wheel-end sealing solution for Isuzu, Chevrolet, and GMC medium-duty trucks. If you require improved debris exclusion, broad temperature performance, and compatibility with mixed lubricants, this seal is built to meet those operational needs.\u003c\/p\u003e\n\u003csection class=\"product-faq-snippet\"\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Does the 380003A fit my 2005 Isuzu HTR?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: It can fit 2005 Isuzu HTR models, but confirm using your vehicle details and the seller’s Confirm Fit notes before ordering.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: What temperature range can this seal tolerate?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: The PTFE compound operates roughly between -100°F and 450°F (-73°C to 232°C).\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"National","offers":[{"title":"Default Title","offer_id":48082993217694,"sku":"B0018699OI","price":51.94,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0781\/2041\/9486\/files\/national-380003a-front-face.jpg?v=1785822084","url":"https:\/\/northtrailauto.ca\/products\/national-wheel-seal-380003a-for-medium-duty-trucks-ptfe-triple-barrier-low-friction","provider":"North Trail Auto","version":"1.0","type":"link"}