SPARKWHIZ Trailer Shackle Kit for Tandem Axle Double-Eye Springs — 6000 lb/axle, steel with nylon bushings

SPARKWHIZ Trailer Shackle Kit is a complete suspension replacement set designed for tandem-axle trailers with double-eye leaf springs, rated to support up to 6,000 lb per axle (12,000 lb GVWR).

If your trailer uses double-eye springs on a tandem axle setup and you need a robust rebuild or upgrade, this kit supplies the main hardware—equalizers, shackles, bushings and bolts—so you can restore smooth articulation and secure connections. Every component is steel with an anti-corrosion finish and includes nylon bushings to reduce friction and noise. Before ordering, verify your trailer’s spring eye size, axle ratings and mounting dimensions to ensure a correct fit.

How will this shackle kit improve my trailer’s suspension performance?

The kit replaces worn shackles and equalizers, restoring proper spring movement and helping the suspension articulate evenly across bumps. Nylon bushings reduce metal-to-metal contact, which lowers squeaks and vibration while helping distribute load stress across the spring pack.

• Includes two 7-3/4" triangle equalizers for stable spring alignment
• Eight 9/16" nylon bushings to reduce friction and noise
• Heavy-duty steel with rust-resistant coating for long service life

Will these parts fit my tandem trailer with double-eye springs?

The kit is built for double-eye leaf springs on tandem axles and supports up to 6,000 lb per axle. Compatibility depends on your trailer’s existing spring eye spacing and bolt diameter, so measure the eye width and confirm a 9/16" bolt application before installing.

• Designed for double-eye leaf springs on tandem-axle setups
• Comes with 9/16"-14 x 3" bolts and locking nuts for secure mounting
• Verify spring eye diameter and spacing to ensure fitment

What hardware and quantities are included in the kit?

This complete set supplies the parts needed to service both axles on a tandem trailer: equalizers, shackle straps, bushings, bolts and locking nuts. That lets you replace all related suspension hardware in one project without sourcing individual pieces.

• 2 x 7-3/4" triangle equalizers
• 8 x 9/16" nylon bushings and 8 x 2 9/16" shackle straps
• 14 x 9/16"-14 x 3" bolts with locking nuts included

How do the materials and finish affect durability?

All load-bearing parts are made from high-quality steel and treated with an anti-corrosion coating to resist rust in outdoor environments. The nylon bushings protect metal components from wear and reduce ongoing maintenance needs.

• Steel construction for strength under heavy loads and rough terrain
• Corrosion-resistant coating to extend service life outdoors
• Nylon bushings reduce wear, noise and vibration for smoother towing

Who is this for: This SPARKWHIZ Trailer Shackle Kit is aimed at trailer owners, DIY mechanics and repair shops working on tandem-axle trailers with double-eye leaf springs who want a full hardware refresh. If you manage cargo, utility or boat trailers and need a single kit to replace shackles, equalizers and bushings across both axles—provided your spring eye and bolt sizes match—this set supplies the essential parts to complete the job efficiently.