Skyjacker 4.5in Comp Box w/ Dual Rate LT Coil Spring

2021–2024 Jeep Wrangler 2.0L Turbo / 2023 Jeep Wrangler 6.4L 392

Part #: JL45ERBLT

Overview

The Skyjacker 4.5-inch Comp Box with Dual Rate Long Travel (LT) Coil Spring is a precision-engineered suspension upgrade designed specifically for the 2021–2024 Jeep Wrangler 2.0L Turbo and the 2023 Jeep Wrangler 6.4L 392 models. This system enhances your Jeep’s off-road capability and ride quality by incorporating a progressive variable rate coil spring that adapts to varying terrain and driving conditions. Ideal for enthusiasts seeking improved articulation, comfort, and suspension performance without sacrificing factory handling characteristics.

Skyjacker’s innovative dual rate coil spring design delivers a smooth, controlled ride on-road while providing increased flex and articulation off-road. The system maintains tire contact with the terrain during full suspension droop, ensuring superior traction and stability in challenging environments.

Key Features

This suspension upgrade offers a range of advanced features engineered to optimize your Jeep Wrangler’s performance and durability:

• Progressive variable rate coil spring with a unique 2-stage dual rate design for balanced ride comfort and articulation
• First Flex Rate stage provides a comfortable ride and increased suspension flex for enhanced off-road articulation
• Second Ride Rate stage engages after compression beyond the flex rate, supporting load and maintaining handling precision
• Side-specific rear coil springs engineered to complement the Wrangler’s suspension geometry
• Front Adjustable Track Bar with heavy-duty OEM-style rubber bushings and a 3/4-inch adjustable rod end for precise alignment
• Heavy-duty Rear Track Bar Upper Mount Bracket to properly center the axle under the vehicle
• Front and Rear Bump Stop Spacers to safely limit suspension travel and protect components
• Extended length Front and Rear Sway Bar End Links with HD OEM-style rubber bushings to allow full articulation
• Maintains proper suspension geometry to ensure Electronic Stability Control (ESC) functions within factory parameters

Construction & Design

Skyjacker’s 4.5-inch Comp Box system features coil springs crafted from high-quality steel with a progressive variable rate design that adapts to different driving demands. The dual rate long travel coil springs are engineered for durability and consistent performance, ensuring they remain seated properly in the upper coil mount during full suspension droop. The front adjustable track bar and rear track bar mount bracket are constructed with heavy-duty materials to withstand rigorous off-road use while maintaining precise axle positioning. All bushings are OEM-style rubber, pressed in for durability and noise reduction, providing a balance of strength and comfort.

Installation & Fitment

This Skyjacker suspension system is designed for direct fitment on 2021–2024 Jeep Wrangler models equipped with the 2.0L Turbo engine and the 2023 Jeep Wrangler 6.4L 392. Installation requires standard suspension tools and moderate mechanical knowledge. The kit includes all necessary components to replace factory parts without the need for additional modifications. Proper alignment after installation is recommended to ensure optimal handling and tire wear.

What's Included

• 4.5-inch dual rate long travel coil springs (front and side-specific rear)
• Front Adjustable Track Bar with pressed-in HD OEM-style rubber bushings and adjustable 3/4-inch rod end
• Heavy-duty Rear Track Bar Upper Mount Bracket
• Front and Rear Bump Stop Spacers
• Extended length Front and Rear Sway Bar End Links with pressed-in HD OEM-style rubber bushings
• Jam nut and alignment bushings for track bar adjustment

Ideal For

This Skyjacker 4.5in Comp Box with Dual Rate LT Coil Spring kit is perfect for Jeep Wrangler owners who demand enhanced off-road articulation and ride comfort without compromising on-road handling. It is especially suited for enthusiasts who frequently tackle rugged terrain, rock crawling, or require improved suspension travel and stability for daily driving and weekend adventures alike.

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.