{"product_id":"2-pieces-replacement-sw4b-4-leaf-trailer-spring-kit-1750lb-each","title":"2 Pieces Replacement SW4B 4-Leaf Trailer Spring Kit - 1750lb Each","description":"\u003cp\u003eIn this review the focus is on a practical trailer suspension replacement kit intended for standard 3,500lb single axles. The reviewer found it best for owners who need a direct SW4B swap with reliable load capacity and straightforward hardware included. The single biggest reason to buy is the matched 1,750lb capacity per spring and the complete set of u-bolts and hangers that make a one-stop replacement, delivering predictable ride support and corrosion-resistant construction for trailer use.\u003c\/p\u003e\u003ch2\u003eKey Features\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eLoad capacity:\u003c\/strong\u003e Each leaf spring is rated at 1,750lb, providing matched support for a 3,500lb axle and predictable towing stability.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExact fit dimensions:\u003c\/strong\u003e Eye-to-eye length of 25-1\/4 in and 3 in free-open length help ensure a correct replacement for SW4B-style suspensions.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDurable construction:\u003c\/strong\u003e Heavy duty carbon steel with anti-rust coating increases resistance to corrosion and extends service life in road and marine conditions.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eComplete hardware kit:\u003c\/strong\u003e Includes 4 u-bolts, tie plates, hangers, shackle straps and bolts so most swaps can be completed without sourcing extra parts.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBushing ready:\u003c\/strong\u003e Two 9\/16 in bushings are installed per spring to simplify installation and reduce initial fitment effort.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eWho It's For\u003c\/h2\u003e\u003cp\u003eThis kit is aimed at trailer owners who need a like-for-like replacement for SW4B leaf springs on a single 3,500lb axle, including boat trailers and utility trailers that require matched spring capacity. Installers who prefer a packaged solution with u-bolts, tie plates, hangers and shackles will appreciate having the common fasteners included.\u003c\/p\u003e\u003cp\u003eIt is not ideal for heavy commercial trailers that exceed the rated axle capacity or for custom suspension setups that require non-standard eye-to-eye lengths or different leaf widths. Those seeking premium powder-coat finishes or custom spring rates should look elsewhere.\u003c\/p\u003e\u003ch2\u003ePros \u0026amp; Cons\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003ePros\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eSolid 1,750lb per spring rating provides proper support for a 3,500lb axle when installed as a pair.\u003c\/li\u003e\n\u003cli\u003eComprehensive hardware pack reduces the need to hunt for matching u-bolts and hangers.\u003c\/li\u003e\n\u003cli\u003eCarbon steel construction with anti-rust coating improves longevity in wet and coastal environments.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCons\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eSome customers report missing parts in shipments, so verify all components on receipt.\u003c\/li\u003e\n\u003cli\u003eThe nut tightening instruction (tighten horizontally) is important; incorrect tightening can affect performance and user experience.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eSpecifications\u003c\/h2\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003ctd\u003eReplacement fit\u003c\/td\u003e\n\u003ctd\u003eSW4B\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSpring capacity\u003c\/td\u003e\n\u003ctd\u003e1,750lb per spring (pair for 3,500lb axle)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEye-to-eye length\u003c\/td\u003e\n\u003ctd\u003e25-1\/4 in\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFree open\u003c\/td\u003e\n\u003ctd\u003e3 in\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLeaf configuration\u003c\/td\u003e\n\u003ctd\u003e4 leaves, 1-3\/4 in width, 5\/16 in thickness\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBushing\u003c\/td\u003e\n\u003ctd\u003e9\/16 in diameter, 2 installed per spring\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eU-bolt kit\u003c\/td\u003e\n\u003ctd\u003e4 x 5-1\/2 in U-bolts, 1\/2 in thread, tie plates and 8 hex nuts\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003ch2\u003eOur Verdict\u003c\/h2\u003e\u003cp\u003eThis replacement kit is a practical, cost-effective choice for trailer owners seeking a direct SW4B swap with proven 1,750lb spring capacity and a full hardware set included. It offers durable carbon steel construction with anti-rust coating and simplifies most repairs, but buyers should inspect the kit on arrival for missing pieces and follow the horizontal nut tightening instruction for best results.\u003c\/p\u003e\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003eWill these springs fit my 3,500lb trailer axle?\u003c\/strong\u003e\u003cbr\u003eYes, each spring is rated 1,750lb and the pair is intended for standard 3,500lb single axles when dimensions match.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the kit include all u-bolts and hangers needed?\u003c\/strong\u003e\u003cbr\u003eThe kit includes 4 u-bolts, tie plates, hangers, shackle straps and hardware, but inspect the shipment on receipt because some customers report missing parts.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eAre bushings installed?\u003c\/strong\u003e\u003cbr\u003eYes, two 9\/16 in bushings are installed per spring to simplify installation.\u003c\/p\u003e","brand":"SEHNSUCHT","offers":[{"title":"Default Title","offer_id":48680946139355,"sku":"B0BX69T1FC","price":105.97,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0724\/1043\/1707\/files\/71vIEKTW9hL._AC_SL1500.jpg?v=1778712327","url":"https:\/\/gearmusthave.com\/products\/2-pieces-replacement-sw4b-4-leaf-trailer-spring-kit-1750lb-each","provider":"GearMustHave","version":"1.0","type":"link"}