OZISENS Trailer Axle Equalizer & Shackle Kit 7-3/4" for 3500–5200 lb Axles — Tandem Repair Set with Nylon Bushings

The OZISENS Trailer Axle Equalizer 312L Shackle Kit is a complete tandem-axle suspension repair set designed to replace worn equalizers and shackles on 3,500–5,200 lb trailer axles.

If your trailer’s ride feels uneven, the suspension is noisy, or worn shackles and bushings are visible, this kit supplies the common replacement parts needed to restore proper spring-to-equalizer function. The set combines two 7-3/4" equalizers, multiple shackle straps, bolts, nylon bushings, and self-locking nuts to match many tandem double-eye spring configurations used on small to medium utility and boat trailers.

How do I know this kit will fit my trailer?

Measure the existing equalizer length and shackle hole spacing before ordering. This kit is built for tandem double-eye springs with equalizers about 7-3/4" long and shackle straps with 3-1/8" (≈3.12") hole spacing.

• Fits trailer axles rated 3,500–5,200 lb per axle setup.
• Includes two 7-3/4" equalizers for tandem applications.
• Shackle strap hole spacing: 3-1/8" (3.12").
• Check your current bolt diameters and lengths before purchase.

What parts are included and why are they useful?

The kit contains all hardware to swap worn components without sourcing individual pieces. Replacing equalizers, shackles, bushings, bolts, and nuts in one job saves time and ensures matched parts for balanced suspension performance.

• 2 equalizers (7-3/4") for tandem setups.
• 8 shackle straps (4.4" length) with correct hole spacing.
• 14 nylon bushings (3-3/8" bolt length compatibility) to reduce metal-on-metal wear.
• 14 bolts and 14 9/16"-18 self-locking nuts for secure fastening.

What materials and finish does the kit use, and how durable is it?

Components are made from hard, wear-resistant steel with a black oxidized and painted finish to resist corrosion and deformation in typical trailer service conditions. Nylon bushings reduce friction and absorb movement between steel parts.

• High-strength steel construction for structural durability.
• Black oxidized plus painted surface to slow rust and corrosion.
• Nylon bushings for quieter operation and reduced wear.
• Self-locking nuts to resist loosening under vibration.

How difficult is installation and what should I prepare?

Installation requires basic mechanical skills, the right tools, and safe trailer support. You’ll need to lift and support the trailer, remove the wheel(s) if necessary, unbolt old shackles and equalizers, and fasten the new components to the specified torque values.

• Prepare jack stands, socket set, torque wrench, and penetrating oil.
• Expect 1–3 hours depending on experience and tandem access.
• Follow safety procedures: chock wheels and use rated supports.
• Verify bolt tightness after initial road test and re-torque if needed.

Who is this for: This OZISENS equalizer and shackle kit is intended for trailer owners, DIY mechanics, and small fleet operators who need to replace worn or damaged tandem-axle suspension components on utility, boat, car hauler, or small cargo trailers rated roughly 3,500–5,200 lb per axle. It’s useful when you want a single-purchase repair solution with matched parts rather than sourcing individual pieces. If you’re unsure about fitment, measure your current equalizer length and shackle hole spacing, or consult a technician before installation. OZISENS offers customer support if any parts are missing or if you need assistance locating the correct size for your trailer.