SEHNSUCHT 4-Leaf Trailer Replacement Springs Kit for SW4B – 3,500 lb Tandem (2x1,750 lb, Double-Eye, Hardware Included)

If 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.

How do these springs match my trailer's load and fit?

Each 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.

• Eye-to-eye length: 25-1/4 inches
• Free arch (open): 3 inches
• Leaf width: 1-3/4 inches, four leaves, 5/16 inch thickness
• Bushing diameter: 9/16 inch with two bushings preinstalled

What hardware is included and why does it matter?

The 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.

• Two full U-bolt kits: four 5-1/2" U-bolts, tie plates, and eight 1/2"-20 nuts — fits 2-3/8" axles
• Equalizers: 2 EQ-E1 equalizers to balance the tandem spring action
• Hanger and shackle kit: 6 hangers, 8 shackle straps, 14 shackle bolts with locknuts

How durable and corrosion-resistant are these replacement springs?

SEHNSUCHT 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.

• Carbon steel construction for strength and shock damping
• Additional anti-rust finish for corrosion resistance
• Preinstalled bushings reduce installation time and wear

Are there installation tips or important precautions?

Follow 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.

• Tighten U-bolt nuts horizontally as instructed for correct clamping
• Inspect axle, hangers, and equalizer pins for wear before reuse
• Replace any additional worn fasteners or bushings for best results

Who 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.