{"product_id":"dana-spicer-37299-replaced-by-070sc128-front-steering-knuckle-lower-kingpin-cap-plate-1","title":"Spicer 070SC128 Front Steering Knuckle Lower Kingpin Cap Plate (Replaces 37299)","description":"\u003cp data-path-to-node=\"7\"\u003eMaintain perfect steering geometry, protect your internal steering knuckle bearings, and prevent hazardous wheel slop with this genuine \u003cb data-path-to-node=\"7\" data-index-in-node=\"136\"\u003eSpicer Front Steering Knuckle Lower Kingpin Cap Plate\u003c\/b\u003e. Custom-engineered by Dana as a direct tier-one original equipment manufacturer (OEM) replacement component, this high-durability plate (\u003cb data-path-to-node=\"7\" data-index-in-node=\"327\"\u003ePart Number: 070SC128\u003c\/b\u003e) is built to withstand extreme wheel loads, heavy cargo weight distributions, and punishing road environments. It directly replaces superceded legacy part number \u003cb data-path-to-node=\"7\" data-index-in-node=\"511\"\u003e37299\u003c\/b\u003e.\u003c\/p\u003e\n\u003cp data-path-to-node=\"8\"\u003eOn commercial vehicles, heavy-duty vocational fleets, and line-haul transport trucks, the steering knuckle relies on a high-strength kingpin assembly rather than a standard light-duty ball joint to pivot smoothly under massive freight loads. The lower kingpin cap plate acts as a structural seal at the absolute bottom of the steering assembly. It serves two vital mechanical roles: it structurally retains the lower kingpin bushing and thrust bearings securely inside the knuckle bore, and it acts as an airtight, grease-retaining seal. Over high operating hours, road debris exposure, or severe winter road salt contamination, the factory cap plate can rust out, warp, or crack under immense vibration. A compromised lower cap plate allows high-pressure grease to escape, leading to immediate water contamination and dirt invasion. This starves the internal needle bearings of lubrication, manifesting as a dangerous \"death wobble,\" stiff or binding steering wheels, uneven front tire wear, and failed commercial vehicle safety inspections. Replacing the worn plate with this authentic forged-steel Spicer component ensures your front-end architecture is completely sealed to factory standards.\u003c\/p\u003e\n\u003cp data-path-to-node=\"9\"\u003ePrecision-machined from ultra-high-tensile structural steel alloy by Dana Spicer—the global benchmark in commercial vehicle drivetrain and steering engineering—this lower kingpin plate features a thick, warp-resistant mounting flange and precise bolt-hole alignments to guarantee a flush, leak-free seal against the steering knuckle face. Engineered to handle extreme rotational friction and continuous vertical load spikes, it provides a solid foundation for your front steer axle rebuild. Sourcing this genuine OEM component guarantees that your vehicle's steering track alignment limits match original fleet engineering blueprints exactly.\u003c\/p\u003e\n\u003cp data-path-to-node=\"10\"\u003e\u003cb data-path-to-node=\"10\" data-index-in-node=\"0\"\u003eComponent Highlights:\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\u003cb data-path-to-node=\"11,0,0\" data-index-in-node=\"0\"\u003eDirect OEM Supercession Upgrade:\u003c\/b\u003e Specifically updates and replaces older legacy part number 37299, incorporating modern metallurgy and optimized corrosion resistance.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"11,1,0\"\u003e\u003cb data-path-to-node=\"11,1,0\" data-index-in-node=\"0\"\u003eLeak-Proof Grease Retention:\u003c\/b\u003e Engineered with a precision-ground mating surface to lock high-viscosity grease within the lower kingpin pocket, safeguarding internal bearings from moisture.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"11,2,0\"\u003e\u003cb data-path-to-node=\"11,2,0\" data-index-in-node=\"0\"\u003eForged Structural Durability:\u003c\/b\u003e Fabricated from premium micro-alloy steel to prevent plate deformation, keeping the lower kingpin components tightly retained during hard curb impacts or heavy braking.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"11,3,0\"\u003e\u003cb data-path-to-node=\"11,3,0\" data-index-in-node=\"0\"\u003eCommercial Vehicle Grade Precision:\u003c\/b\u003e Built to the identical tolerances, dimensions, and balance metrics used by heavy-duty commercial truck assembly lines worldwide.\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\"\u003eAxle \u0026amp; Fitment Specifications:\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\"\u003eAxle Component Location:\u003c\/b\u003e Front Steer Axle — Steering Knuckle Assembly (Lower Position).\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\"\u003eSuperceded Part Numbers:\u003c\/b\u003e Replaces Dana Spicer 37299, 070-SC-128.\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\"\u003eMaterial Composition:\u003c\/b\u003e Forged Heavy-Gauge Steel Alloy.\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\"\u003eFastener Style:\u003c\/b\u003e Multi-bolt mounting layout (Hardware and gasket\/shims sold separately; always replace shims and seal rings during installation to ensure proper kingpin preload).\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"13,4,0\"\u003e\u003cb data-path-to-node=\"13,4,0\" data-index-in-node=\"0\"\u003eCommon System Applications:\u003c\/b\u003e Fits various heavy-duty Class 6, 7, and 8 commercial vehicle front steer axles from major manufacturers including Freightliner, International, Peterbilt, Kenworth, Volvo, Mack, and commercial bus platforms equipped with Dana Spicer steering assemblies.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Spicer","offers":[{"title":"Default Title","offer_id":43562007724106,"sku":"PLAT-SPICER-070SC128","price":37.35,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0706\/5560\/6858\/files\/12_afa622ae-1a9b-412c-8b3e-495c45519b0d.jpg?v=1777681581","url":"https:\/\/platinumperformanceparts.com\/products\/dana-spicer-37299-replaced-by-070sc128-front-steering-knuckle-lower-kingpin-cap-plate-1","provider":"Platinum Performance Parts","version":"1.0","type":"link"}