ATRO SK55-10000 Spring Eye Shackle Kit for International 3000/4000/7000 Series

ATRO SK55-10000 Spring Eye Shackle Kit

The ATRO SK55-10000 is a heavy-duty, polyurethane spring eye shackle kit designed to replace high-wear rubber components on the rear of the front spring. Proudly made in the USA, ATRO’s polyurethane technology eliminates the need for grease while providing superior resistance to road chemicals, salt, and environmental aging.

Quick Specs

• Part Number: SK55-10000

• Category: Suspension

• Position: Rear of Front Spring

• Outside Diameter (Ref): 1 1/2"

• Sidebar Specs: 6 1/8" L x 2 1/4" W x 1" T

• Center-to-Center (C-C): 3.5"

• Weight: 11.595 lbs

• Quantity Per Vehicle: 2 Kits (Services both sides)

Kit Components

This comprehensive kit includes everything needed for one side:

• (2) SP00-11561 Bushings (High-load Polyurethane)

• (2) Sidebars (Forged Strength)

• (4) Mounting Bolts

• (4) Heavy-Duty Locknuts

Key Features & Benefits

• Maintenance Free: ATRO’s polyurethane is chemically engineered to be "self-lubricating." No more greasing your shackles.

• Improved Handling: By replacing soft, compressed rubber with rigid polyurethane, you reduce lateral sway and improve steering precision.

• Superior Durability: Resistant to oils, grease, road salt, and ozone.

• American Precision: Manufactured in the United States for exact fitment on heavy-duty applications.

Vehicle Fitment & Compatibility

Designed specifically for International (Navistar) trucks with cast hangers, including:

• Heavy S-Series

• 3000 Series (Bus)

• 4000 Series

• 7000 Series

Cross Reference Guide

Installation Recommendations

• Required Tools: For the most efficient installation, use the PT00-53000 Install Tool.

• Service Note: It is highly recommended to replace these in pairs (both driver and passenger sides) to ensure balanced suspension geometry.