{"product_id":"firestone-coil-rite-air-helper-spring-kit-rear-98-17-toyota-4runner-w237604135","title":"Firestone 4135 Coil-Rite Air Helper Spring Kit Rear for 98-25 Toyota 4Runner\/FJ","description":"\u003cmeta name=\"x-apple-disable-message-reformatting\"\u003e\u003ch4\u003eVehicle Fitment\u003c\/h4\u003e\u003cul\u003e \u003cli\u003e1998-2025 Toyota 4Runner (2WD\/4WD)\u003c\/li\u003e \u003cli\u003e2007-2014 Toyota FJ Cruiser (2WD\/4WD)\u003c\/li\u003e \u003cli\u003e2013-2018 Lexus LX 570 (AWD)\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eFitment Notes\u003c\/h4\u003e\u003cul\u003e \u003cli\u003eDesigned as rear helper springs inside OEM coil springs\u003c\/li\u003e \u003cli\u003eSupports 500-1,000 lb rear load (max 1,000 lb per set)\u003c\/li\u003e \u003cli\u003eNo drilling required; bolt-in with included hardware and manual inflation valves\u003c\/li\u003e \u003cli\u003eNot compatible with extra-lift aftermarket springs--requires stock coil inner diameter ~4.75\"\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eFeatures\u003c\/h4\u003e\u003cul\u003e \u003cli\u003eMade of durable polyurethane--operates between -40°F to 180°F\u003c\/li\u003e \u003cli\u003eVariable-rate load support--acts like additional spring under load\u003c\/li\u003e \u003cli\u003eNo air compressor needed; inflate like a tire (5-35 psi)\u003c\/li\u003e \u003cli\u003eImprove ride stability, reduce rear sag and enhance braking with trailer or heavy cargo\u003c\/li\u003e \u003cli\u003eManual-control inflation kit included; can add Firestone Air Command system\u003c\/li\u003e \u003cli\u003eRated for 1,000 lb load and includes magnetic drain plug\u003c\/li\u003e \u003cli\u003eSupported by Firestone's limited lifetime warranty on air springs, 2-year on hardware\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eSpecifications\u003c\/h4\u003e\u003cul\u003e \u003cli\u003ePart Number: 4135 (W237604135)\u003c\/li\u003e \u003cli\u003eAir Spring Diameter: 4.75\"; Length: 7.50\"\u003c\/li\u003e \u003cli\u003eLoad Capacity: 1,000 lb (set)\u003c\/li\u003e \u003cli\u003ePressure Range: 5-35 psi\u003c\/li\u003e \u003cli\u003eTemperature Range: -40 °F to 180 °F\u003c\/li\u003e \u003cli\u003eInstallation Time: ~1-2 hours\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eIncluded Components\u003c\/h4\u003e\u003cul\u003e \u003cli\u003e2x Firestone Coil-Rite air springs\u003c\/li\u003e \u003cli\u003e2x Mounting support plates\u003c\/li\u003e \u003cli\u003eAir line tubing and two manual inflation valves\u003c\/li\u003e \u003cli\u003eInstallation instructions\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eProduct Description\u003c\/h4\u003e\u003cp\u003eThe Firestone 4135 Coil-Rite Rear Air Spring Kit is engineered to provide adjustable load support and improved ride quality for 1998-2025 Toyota 4Runner, 2007-2014 FJ Cruiser, and Lexus LX 570 platforms. These airbags fit inside the factory coil springs and operate between 5 and 35 psi to help maintain level suspension when carrying heavy loads or towing.\u003c\/p\u003e\u003cp\u003eConstructed from high-quality polyurethane and rated for temperatures from -40°F to 180°F, this kit installs in about an hour without drilling, using included hardware and manual valves. With support for up to 1,000 lb and bolstered braking stability, rear ride height, and cornering control, it's an easy, effective upgrade backed by Firestone's lifetime air-spring warranty and 2-year hardware protection.\u003c\/p\u003e\u003cmeta name=\"keywords\" content=\"Firestone Coil-Rite air springs, Air helper springs for Toyota 4Runner, Coil-Rite air suspension kit, Firestone suspension parts, Rear air bags for FJ Cruiser, Custom suspension for Toyota SUV, Adjustable air springs for heavy loads, Performance coil spring enhancement, Durable polyurethane air helper springs, Firestone suspension kit with warranty\"\u003e\u003cmeta name=\"description\" content=\"Enhance your ride with Firestone Coil-Rite air helper springs for Toyota 4Runner and FJ Cruiser. Achieve better handling and load support easily.\"\u003e","brand":"Firestone","offers":[{"title":"Default Title","offer_id":53465158517055,"sku":"FIR4135","price":126.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0832\/7308\/9343\/files\/10db5603403043c34f37a31842539935_cb7de307-a74b-4467-885e-a0fa67d713db.jpg?v=1780178399","url":"https:\/\/wcaperformance.com\/products\/firestone-coil-rite-air-helper-spring-kit-rear-98-17-toyota-4runner-w237604135","provider":"WCA Performance","version":"1.0","type":"link"}