{"product_id":"firestone-coil-rite-air-helper-spring-kit-rear-04-17-toyota-sienna-w237604155","title":"Firestone 4155 CoilRite Rear Air Helper Springs for Toyota Sienna\/Chevy Uplander","description":"\u003cmeta name=\"x-apple-disable-message-reformatting\"\u003e\u003ch4\u003eVehicle Fitment\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e2004-2026 Toyota Sienna (FWD only -- does NOT fit AWD or Hybrid)\u003c\/li\u003e\n\u003cli\u003e2005-2009 Chevy Uplander\u003c\/li\u003e\n\u003cli\u003e2005-2007 Buick Terraza\u003c\/li\u003e\n\u003cli\u003e2005-2007 Saturn Relay\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eFitment Notes\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eRear axle only\u003c\/li\u003e\n\u003cli\u003eToyota Sienna: FWD models only -- does not fit AWD or Hybrid variants\u003c\/li\u003e\n\u003cli\u003eNo drilling required\u003c\/li\u003e\n\u003cli\u003eManual fill -- air compressor sold separately (see Air Accessory Systems)\u003c\/li\u003e\n\u003cli\u003eReplacement air spring: Firestone 6020\u003c\/li\u003e\n\u003cli\u003eFull product number: W237604155\u003c\/li\u003e\n\u003cli\u003eInstallation time: 1-2 hours\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eFeatures\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eInstalls inside existing coil springs -- creates variable spring rate\u003c\/li\u003e\n\u003cli\u003eLevels vehicle under load\u003c\/li\u003e\n\u003cli\u003eReduces body roll and bottoming out\u003c\/li\u003e\n\u003cli\u003eImproves braking and handling under load\u003c\/li\u003e\n\u003cli\u003eAdjustable pressure for varying loads and conditions\u003c\/li\u003e\n\u003cli\u003eIndividual inflation valves -- adjust each side independently\u003c\/li\u003e\n\u003cli\u003eDurable elastic polyurethane construction\u003c\/li\u003e\n\u003cli\u003eOperating temperature range: -40°F to 180°F (-40°C to 82°C)\u003c\/li\u003e\n\u003cli\u003eCompatible with all Firestone Air Command compressor kits (sold separately)\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eSpecifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003ePart Number: 4155 (W237604155)\u003c\/li\u003e\n\u003cli\u003eSeries: Coil-Rite\u003c\/li\u003e\n\u003cli\u003ePosition: Rear\u003c\/li\u003e\n\u003cli\u003eFill Type: Manual\u003c\/li\u003e\n\u003cli\u003eLoad Capacity: 500-1,000 lbs. per set\u003c\/li\u003e\n\u003cli\u003eMin. Air Pressure: 5 PSI\u003c\/li\u003e\n\u003cli\u003eMax. Air Pressure: 35 PSI\u003c\/li\u003e\n\u003cli\u003eTemperature Range: -40°F to 180°F (-40°C to 82°C)\u003c\/li\u003e\n\u003cli\u003eMaterial: Elastic polyurethane\u003c\/li\u003e\n\u003cli\u003eDrilling Required: No\u003c\/li\u003e\n\u003cli\u003eReplacement Air Spring: Firestone 6020\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eIncluded Components\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e2x Coil-Rite air springs\u003c\/li\u003e\n\u003cli\u003eAir line and individual inflation valves\u003c\/li\u003e\n\u003cli\u003eAll mounting hardware\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eProduct Description\u003c\/h4\u003e\u003cp\u003eThe Firestone 4155 Coil-Rite is a rear air helper spring kit for the 2004-2026 Toyota Sienna (FWD only), 2005-2009 Chevy Uplander, 2005-2007 Buick Terraza, and 2005-2007 Saturn Relay. The Coil-Rite springs install inside the existing rear coil springs without drilling, creating a variable spring rate that stiffens automatically under load and softens when unloaded. The result is a leveled vehicle under heavy cargo or passenger loads, reduced body roll, and improved braking and handling effectiveness -- without altering ride quality when the vehicle is empty.\u003c\/p\u003e\u003cp\u003ePressure is adjusted through individual inflation valves -- the same as inflating a tire -- allowing each side to be tuned independently for uneven loads. The 5-35 PSI operating range and 500-1,000 lb load capacity cover the full range of real-world loading situations for these minivan platforms. The elastic polyurethane construction is rated for temperatures from -40°F to 180°F for year-round use. This kit is manual fill; air compressor kits (Firestone Air Command series, sold separately) can be added for cab-controlled inflation. Note the Toyota Sienna fitment covers FWD models only -- AWD and Hybrid Sienna variants are not compatible.\u003c\/p\u003e\u003cmeta name=\"keywords\" content=\"Firestone Coil-Rite, rear air helper springs, Toyota Sienna suspension, load leveling air springs, adjustable air pressure springs, coil spring suspension system, enhance ride quality, towing support springs, durable automotive parts, no-drill installation\"\u003e\u003cmeta name=\"description\" content=\"Enhance your 2004-2024 Toyota Sienna's stability with Firestone 4155 Coil-Rite Air Springs. Adjustable support for up to 1,000 lbs!\"\u003e","brand":"Firestone","offers":[{"title":"Default Title","offer_id":53465158648127,"sku":"FIR4155","price":126.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0832\/7308\/9343\/files\/10db5603403043c34f37a31842539935_ccdfb241-ba9e-4c9f-9da0-a09e7ce5af9e.jpg?v=1780178400","url":"https:\/\/wcaperformance.com\/products\/firestone-coil-rite-air-helper-spring-kit-rear-04-17-toyota-sienna-w237604155","provider":"WCA Performance","version":"1.0","type":"link"}