{"product_id":"sehnsucht-4-leaf-trailer-replacement-springs-kit-for-sw4b-3-500-lb-tandem-2x1-750-lb-double-eye-hardware-included","title":"SEHNSUCHT 4-Leaf Trailer Replacement Springs Kit for SW4B – 3,500 lb Tandem (2x1,750 lb, Double-Eye, Hardware Included)","description":"\u003cstrong\u003eSEHNSUCHT 4-leaf replacement springs restore a 3,500 lb tandem trailer axle by providing two 1,750 lb eye-to-eye springs plus U-bolts and hanger hardware for direct SW4B swaps.\u003c\/strong\u003e\n\n\u003cp\u003eIf your trailer ride feels loose, noisy, or the springs are visibly worn, this complete replacement kit from SEHNSUCHT offers a ready-to-install solution designed for tandem axles rated at 3,500 lb. Each leaf pack is engineered from heavy-duty carbon steel with an anti-corrosion coating and ships with bushings, U-bolts, tie plates, equalizers, hangers, shackles and hardware needed to replace SW4B-style springs.\u003c\/p\u003e\n\n\u003ch3\u003eHow do these springs match my trailer's load and fit?\u003c\/h3\u003e\n\u003cp\u003eEach spring in the pair is rated at 1,750 lb, which together support a standard 3,500 lb tandem axle configuration. The springs use double-eye mounting and standard dimensions to replace SW4B units without needing custom fabrication.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eEye-to-eye length: 25-1\/4 inches\u003c\/li\u003e\n  \u003cli\u003eFree arch (open): 3 inches\u003c\/li\u003e\n  \u003cli\u003eLeaf width: 1-3\/4 inches, four leaves, 5\/16 inch thickness\u003c\/li\u003e\n  \u003cli\u003eBushing diameter: 9\/16 inch with two bushings preinstalled\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat hardware is included and why does it matter?\u003c\/h3\u003e\n\u003cp\u003eThe kit comes with all the mounting and axle-clamping components to complete a dependable replacement, reducing the need to source parts separately. Hardware quantities and sizes are matched to the leaf spring profile and common 2-3\/8\" trailer axles for easier assembly.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eTwo full U-bolt kits: four 5-1\/2\" U-bolts, tie plates, and eight 1\/2\"-20 nuts — fits 2-3\/8\" axles\u003c\/li\u003e\n  \u003cli\u003eEqualizers: 2 EQ-E1 equalizers to balance the tandem spring action\u003c\/li\u003e\n  \u003cli\u003eHanger and shackle kit: 6 hangers, 8 shackle straps, 14 shackle bolts with locknuts\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow durable and corrosion-resistant are these replacement springs?\u003c\/h3\u003e\n\u003cp\u003eSEHNSUCHT fabricates the leaves from heavy-duty carbon steel and applies an anti-rust coating to extend service life in wet or salty conditions. Proper installation and torqueing of the included nuts are essential to maintain alignment and long-term performance.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eCarbon steel construction for strength and shock damping\u003c\/li\u003e\n  \u003cli\u003eAdditional anti-rust finish for corrosion resistance\u003c\/li\u003e\n  \u003cli\u003ePreinstalled bushings reduce installation time and wear\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eAre there installation tips or important precautions?\u003c\/h3\u003e\n\u003cp\u003eFollow standard trailer suspension procedures and torque specifications when assembling the kit. A key note from the manufacturer: fastener nuts should be tightened horizontally to avoid distortion or improper seating that could impair ride quality.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eTighten U-bolt nuts horizontally as instructed for correct clamping\u003c\/li\u003e\n  \u003cli\u003eInspect axle, hangers, and equalizer pins for wear before reuse\u003c\/li\u003e\n  \u003cli\u003eReplace any additional worn fasteners or bushings for best results\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho this kit is for: This SEHNSUCHT replacement set is intended for owners, fleet managers, and trailer shops replacing SW4B-style leaf springs on tandem 3,500 lb axles. It suits utility trailers, boat trailers, small car haulers and work trailers needing a matched spring pack plus the axle U-bolts and hanger hardware for a complete, dependable swap. If you want like-for-like geometry, preinstalled bushings, and a corrosion-resistant finish in one package, this kit simplifies the repair and gets your trailer back to predictable handling.\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: Will these springs fit my SW4B trailer axle?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes—these are designed as direct replacements for SW4B with 25-1\/4\" eye-to-eye length and 1-3\/4\" leaf width.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: What axle diameter do the U-bolts fit?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: The included U-bolt kits are sized for 2-3\/8\" round trailer axles with 1\/2\"-20 thread nuts.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"SEHNSUCHT","offers":[{"title":"Default Title","offer_id":48080737435806,"sku":"B0BX67XDP8","price":300.49,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0781\/2041\/9486\/files\/sehnsucht-front-view-leaf-spring-pair.jpg?v=1785784849","url":"https:\/\/northtrailauto.ca\/products\/sehnsucht-4-leaf-trailer-replacement-springs-kit-for-sw4b-3-500-lb-tandem-2x1-750-lb-double-eye-hardware-included","provider":"North Trail Auto","version":"1.0","type":"link"}