Skyjacker Rear Dual Rate Long Travel Coil Component Box

2021–2024 Jeep Wrangler 6.4L 392

Part #: JLUR403RDR

Overview

The Skyjacker Rear Dual Rate Long Travel Coil Component Box is engineered specifically for the 2021–2024 Jeep Wrangler equipped with the 6.4L 392 engine. Designed for off-road enthusiasts who demand superior suspension performance without sacrificing on-road comfort, this coil spring system delivers a balanced ride quality. Its innovative dual rate design provides a smooth, compliant ride during normal driving while offering increased support and articulation for rugged terrain and full suspension droop.

Skyjacker’s precision engineering ensures that your Jeep Wrangler maintains excellent tire contact with the ground, enhancing traction and control in challenging off-road conditions. This coil spring upgrade is ideal for drivers seeking improved handling, durability, and ride comfort in one comprehensive package.

Key Features

Skyjacker’s Rear Dual Rate Long Travel Coil Component Box incorporates advanced technology and thoughtful design to optimize suspension performance:

• Progressive variable rate coil spring with a unique 2-stage dual rate long travel design
• First Flex Rate stage provides a comfortable ride and allows coil expansion during full suspension articulation
• Second Ride Rate stage engages after compression beyond the Flex Rate for enhanced support under load
• Side-specific rear coils engineered to complement the Wrangler’s distinctive suspension geometry
• Constructed from high-strength 5160H chromium alloy steel for superior durability
• Shot peening process increases tensile strength by compressing the spring surface
• Preset solid height eliminates spring sag and reduces fatigue for long-lasting performance
• Baked-on powder coat finish provides excellent corrosion resistance and lasting protection
• Cycle tested to ensure consistent quality and reliability

Construction & Design

Each coil spring is crafted from premium 5160H chromium alloy steel, known for its exceptional strength and resilience under demanding conditions. The manufacturing process includes advanced shot peening, where hard steel pellets are blasted at high velocity to compress the spring’s surface, significantly enhancing its tensile strength and fatigue resistance.

Additionally, the springs undergo a presetting process where they are compressed to solid height, eliminating any initial sag and ensuring consistent ride height and performance over time. The durable powder coat finish not only protects against corrosion but also maintains the coil’s appearance through harsh environments and extended use.

Installation & Fitment

This coil component box is designed for direct fitment on 2021 through 2024 Jeep Wrangler models with the 6.4L 392 engine. Installation typically requires standard suspension disassembly and reassembly procedures, and no major modifications are necessary. For optimal results, professional installation is recommended to ensure proper alignment and suspension geometry.

What's Included

• Rear dual rate long travel coil springs (side-specific)
• Installation instructions
• Protective packaging to prevent damage during shipping

Ideal For

This Skyjacker coil spring system is perfect for Jeep Wrangler 6.4L 392 owners who want to enhance their vehicle’s off-road capability while maintaining a smooth and controlled street ride. It suits enthusiasts who frequently tackle rugged trails, rock crawling, or require extended suspension articulation without compromising daily driving comfort.

Skyjacker is a long-running off-road suspension brand offering lift kits, shocks, steering stabilizers, and related components for trucks, SUVs, and Jeeps. Built to increase clearance for larger tires and improve trail capability, Skyjacker systems are popular for enthusiasts who want a tougher stance and more off-road confidence with proven application coverage.