{"product_id":"ford-super-duty-dana-50-60-inner-knuckle-vacuum-seal-dust-seal-kit-1999-2004","title":"Spicer Front Knuckle Vacuum Seal \u0026 Axle Dust Seal Kit for 1999-2004 Ford Super Duty (Dana 50 \/ 60, Single Side)","description":"\u003cp data-path-to-node=\"7\"\u003eRestore your Electronic Shift-on-the-Fly (ESOF) automatic locking hubs, stop invasive trail debris, and protect your front-end components with this genuine \u003cb data-path-to-node=\"7\" data-index-in-node=\"156\"\u003eSpicer Front Knuckle Vacuum Seal \u0026amp; Axle Dust Seal Kit\u003c\/b\u003e. Specifically engineered to refresh the steering knuckle sealing boundaries on \u003cb data-path-to-node=\"7\" data-index-in-node=\"289\"\u003e1999–2004 Ford F-250 to F-550 Super Duty\u003c\/b\u003e trucks, this single-side overhaul package replaces deteriorated, leaky hub vacuum seals and worn dust boots.\u003c\/p\u003e\n\u003cp data-path-to-node=\"8\"\u003eOn classic Ford Super Duty 4x4 platforms, the automatic front locking hubs rely entirely on a persistent, airtight vacuum environment inside the steering knuckle to actuate 4WD engagement from the dashboard switch. Over high mileage, heavy commercial fleet towing, or harsh winter conditions, the large main outer knuckle vacuum seal dry-rots, cracks, or loses its tension. This introduces an immediate vacuum leak that stops your automatic 4WD system from locking in. Simultaneously, the companion axle shaft dust seal decomposes, creating a gap that permits abrasive trail mud, highway water, and road grit to penetrate your front axle tubes.\u003c\/p\u003e\n\u003cp data-path-to-node=\"9\"\u003eThis original equipment manufacturer (OEM) service kit provides a factory-correct solution to overhaul one front steering knuckle station. Sourcing genuine Spicer components guarantees exact original manufacturing blueprints are met, offering the precise rubber elasticities, integrated metal casings, and multi-lip configurations required to maintain an airtight vacuum seal under extreme steering angles and heavy load suspension cycling.\u003c\/p\u003e\n\u003cp data-path-to-node=\"10\"\u003e\u003cb data-path-to-node=\"10\" data-index-in-node=\"0\"\u003eKit Contents (Services One Steering Knuckle Side):\u003c\/b\u003e\u003c\/p\u003e\n\u003cul data-path-to-node=\"11\"\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"11,0,0\"\u003e(1) Premium Main Outer Axle Shaft to Knuckle Vacuum Seal (Part # 50491 \/ 2023068)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"11,1,0\"\u003e(1) High-Integrity Front Axle Tube Outer Dust Boot Seal (Part # 50381)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-path-to-node=\"12\"\u003e\u003cb data-path-to-node=\"12\" data-index-in-node=\"0\"\u003eKit Highlights:\u003c\/b\u003e\u003c\/p\u003e\n\u003cul data-path-to-node=\"13\"\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"13,0,0\"\u003e\u003cb data-path-to-node=\"13,0,0\" data-index-in-node=\"0\"\u003eRestores Automatic 4WD Vacuum:\u003c\/b\u003e Replaces the critical main outer hub seal to completely secure your vacuum environment, bringing your dashboard Electronic Shift-on-the-Fly (ESOF) automatic hubs back to peak functionality.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"13,1,0\"\u003e\u003cb data-path-to-node=\"13,1,0\" data-index-in-node=\"0\"\u003eGenuine Spicer OEM Engineering:\u003c\/b\u003e Formulated by the vehicle's original equipment axle supplier to guarantee matching factory rubber durometer ratings and precise dimensional fitment.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"13,2,0\"\u003e\u003cb data-path-to-node=\"13,2,0\" data-index-in-node=\"0\"\u003eImpenetrable Dust Barrier:\u003c\/b\u003e The included outer axle shaft dust boot forms a tight physical shield at the entry point of the axle tube, keeping out highway moisture, mud, and abrasive debris.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"13,3,0\"\u003e\u003cb data-path-to-node=\"13,3,0\" data-index-in-node=\"0\"\u003ePrevents Costly Hub Component Wear:\u003c\/b\u003e Replacing worn-out seals early prevents grit contamination from chewing through your expensive front wheel bearing hub assemblies and outer axle shafts.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-path-to-node=\"14\"\u003e\u003cb data-path-to-node=\"14\" data-index-in-node=\"0\"\u003eVehicle \u0026amp; Axle Fitment:\u003c\/b\u003e\u003c\/p\u003e\n\u003cul data-path-to-node=\"15\"\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"15,0,0\"\u003e\u003cb data-path-to-node=\"15,0,0\" data-index-in-node=\"0\"\u003eAxle Profile:\u003c\/b\u003e Open-Knuckle Solid\/Monobeam Front Axles: \u003cb data-path-to-node=\"15,0,0\" data-index-in-node=\"55\"\u003eDana 50 and Dana 60\u003c\/b\u003e configurations with vacuum-operated automatic locking hubs.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"15,1,0\"\u003e\u003cb data-path-to-node=\"15,1,0\" data-index-in-node=\"0\"\u003eFord Models:\u003c\/b\u003e 1999, 2000, 2001, 2002, 2003, and 2004 Ford F-250 Super Duty, F-350 Super Duty, F-450 Super Duty, and F-550 Super Duty 4WD trucks, alongside 2000–2005 Ford Excursion 4x4 vehicles.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"15,2,0\"\u003e\u003cb data-path-to-node=\"15,2,0\" data-index-in-node=\"0\"\u003ePosition:\u003c\/b\u003e Front Steering Knuckle Hub Station (Fits Left or Right Side — 2 Kits Required per Vehicle)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Spicer","offers":[{"title":"Default Title","offer_id":43562450583626,"sku":"PLAT-SPICER-KIT199","price":107.25,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0706\/5560\/6858\/files\/12_bfffd467-9e06-4a4c-a738-a8217df8f335.jpg?v=1777723162","url":"https:\/\/platinumperformanceparts.com\/products\/ford-super-duty-dana-50-60-inner-knuckle-vacuum-seal-dust-seal-kit-1999-2004","provider":"Platinum Performance Parts","version":"1.0","type":"link"}