{"product_id":"maxpeedingrods-cab-air-spring-bag-for-peterbilt-379-direct-fit-heavy-duty-replacement-corrosion-resistant","title":"maXpeedingrods Cab Air Spring Bag for Peterbilt 379 — Direct-Fit Heavy-Duty Replacement, Corrosion-Resistant","description":"\u003cp\u003e\u003cstrong\u003emaXpeedingrods Cab Air Ride Suspension Spring Bag for Peterbilt 379 is a direct-fit, heavy-duty pneumatic cab spring bag designed to replace worn factory units and restore cab isolation on Peterbilt 379 trucks.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eThis replacement cab air spring bag is engineered for fleets and owner-operators who need a dependable, bolt-on solution compatible with common OE part numbers. Built to meet or exceed original equipment specifications, the air bag fits Peterbilt 379 models and cross-references Firestone and Goodyear numbers so you can install with confidence. The design emphasizes corrosion resistance, long fatigue life, and airtight performance verified by extended testing.\u003c\/p\u003e\n\n\u003ch3\u003eWill this fit my Peterbilt 379, and which OE part numbers does it replace?\u003c\/h3\u003e\n\u003cp\u003eYes — this unit is made to match the mounting points and dimensions used on Peterbilt 379 cabs and serves as a direct bolt-on replacement without modification.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eCompatible with Peterbilt 379 cab suspension applications.\u003c\/li\u003e\n  \u003cli\u003eCross-references: 29-03200, 2903200, 2902454.\u003c\/li\u003e\n  \u003cli\u003eInterchanges with Firestone W02-358-7036 \/ W023587036 \/ W02-3587036.\u003c\/li\u003e\n  \u003cli\u003eInterchangeable with Goodyear 1S5-186 on equivalent installations.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow durable and leak-resistant is the maXpeedingrods spring bag?\u003c\/h3\u003e\n\u003cp\u003eThe component is manufactured from rugged materials chosen for corrosion resistance and wear stability, then validated through fatigue and airtightness testing to ensure long service life under heavy use.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eFatigue-tested to withstand over 5 million cycles for longevity under repeated motion.\u003c\/li\u003e\n  \u003cli\u003eAirtight tested continuously for 24 hours with a pressure drop ≤ 0.02 MPa.\u003c\/li\u003e\n  \u003cli\u003eSurface treatments increase resistance to corrosion and abrasion in harsh road environments.\u003c\/li\u003e\n  \u003cli\u003eDesigned to provide a consistent sealing and wear surface throughout its service life.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eIs installation straightforward, and will I need modifications or special tools?\u003c\/h3\u003e\n\u003cp\u003eInstallation is intended to be a direct bolt-on swap for failed factory units, requiring no structural modifications; standard shop tools for suspension work are typically sufficient.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eDirect replacement — mounts to existing cab hardware and brackets.\u003c\/li\u003e\n  \u003cli\u003eNo cutting, welding, or custom fabrication necessary for correct fitment.\u003c\/li\u003e\n  \u003cli\u003eRecommended: basic wrench set, torque wrench, and air line fittings for reassembly.\u003c\/li\u003e\n  \u003cli\u003eIf unsure, a professional heavy-truck technician can complete installation quickly.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat kind of warranty and support does maXpeedingrods provide?\u003c\/h3\u003e\n\u003cp\u003emaXpeedingrods backs this part against manufacturing defects for one year from the purchase date and offers lifetime technical support to help with fitment or troubleshooting.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003e1-year limited warranty covering manufacturing defects under normal use.\u003c\/li\u003e\n  \u003cli\u003eLifetime technical support and customer service for installation questions.\u003c\/li\u003e\n  \u003cli\u003eWarranty terms require proof of purchase and proper installation.\u003c\/li\u003e\n  \u003cli\u003eCustomer support can advise on compatibility with specific truck setups.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho this is for: This cab air spring bag is aimed at Peterbilt 379 owners, fleet maintenance managers, and service shops that need a rugged, OEM-compatible replacement part to restore cab ride quality and protect cab components. Choose this unit when you want a direct-fit, corrosion-resistant pneumatic mount with proven fatigue and airtight testing, plus manufacturer backing for peace of mind.\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 this air spring require any bracket modifications to fit a Peterbilt 379?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: No. It is a direct bolt-on replacement designed to fit existing Peterbilt 379 cab mounting points without modifications.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: What parts does this replace and cross-reference?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: It replaces 29-03200, 2903200, 2902454 and cross-references Firestone W02-358-7036 and Goodyear 1S5-186.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"maXpeedingrods","offers":[{"title":"Default Title","offer_id":55170579792215,"sku":"B07WSD9SN4","price":122.96,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1050\/1524\/7191\/files\/maxpeedingrods-cab-air-spring-front-view.jpg?v=1790431260","url":"https:\/\/britishgarage.co.uk\/products\/maxpeedingrods-cab-air-spring-bag-for-peterbilt-379-direct-fit-heavy-duty-replacement-corrosion-resistant","provider":"British Garage","version":"1.0","type":"link"}