3500 lb Single Axle Kit Idler 89/74 – Foundation Kit

SKU # 35SA8974545FK

Start your trailer build with the essential running gear using this 3,500 lb Single Axle Foundation Kit. Built around an 89″ hub face / 74″ spring center idler axle, this package includes the axle, leaf springs, U-bolt mounting hardware, and single axle hanger kit needed to establish the core suspension system for a dependable single axle trailer.

This kit is ideal for builders who already have their tires, wheels, fenders, coupler, jack, lighting, and other trailer components—or who prefer to select those items separately for a custom build.

What’s Included

Axle & Suspension

• (1) 3,500 lb Idler Axle – 89″ Hub Face / 74″ Spring Center
• Double Eye Leaf Springs
• U-Bolt Mounting Hardware
• (1) Single Axle Hanger Kit

Kit Specifications

Features & Benefits

Essential Trailer Foundation

This kit provides the primary axle and suspension components needed to establish the running gear foundation of a single axle trailer.

3,500 lb Idler Axle

The included 89/74 idler axle provides a dependable foundation for medium-duty utility, landscape, cargo, and custom trailer applications.

Suspension Components Included

Leaf springs, U-bolt mounting hardware, and the single axle hanger kit are included so the axle and suspension can be installed as a coordinated system.

Flexible Build Option

A Foundation Kit gives you the freedom to choose your own tires, wheels, fenders, coupler, jack, electrical system, and other components based on the specific needs of your trailer.

Great for New Builds or Repairs

Use this package as the starting point for a new fabrication project or as a convenient way to replace worn or damaged axle and suspension components on an existing trailer.

Common Applications

• Utility Trailers
• Landscape Trailers
• Lawn Care Trailers
• Cargo Trailers
• ATV & UTV Trailers
• Motorcycle Trailers
• Small Equipment Trailers
• Farm & Property Trailers
• Custom Trailer Builds
• Trailer Repairs & Rebuilds

Foundation Kit vs. Rolling Kit

The Foundation Kit includes the axle and suspension components needed to establish the trailer’s running gear.

If you also need tires, wheels, fenders, coupler, jack, and safety chains, a Rolling Kit may be the better option. For a more complete build package with blueprints, lighting, wiring, gate hardware, and other components, consider a Master Kit.

Important Fitment Information

Please verify all trailer measurements before ordering.

• Hub Face: 89″
• Spring Center: 74″
• Axle Capacity: 3,500 lbs
• Axle Type: Idler / Non-Braking

The 3,500 lb axle rating does not automatically mean the completed trailer is rated for 3,500 lbs of payload. Final trailer capacity and legal GVWR depend on the completed trailer design and the lowest-rated component in the assembly.

Need help confirming axle dimensions or choosing the correct kit level? Contact Highway 96 Trailers and our team can help you select the right setup for your trailer project.