Superlift Dual Rate Coil Springs

2018–2019 Jeep Wrangler JL 2 Door

Part #: 599

Overview

The Superlift 4-inch Lift Dual Rate Coil Springs (Pair) are engineered specifically for the rear suspension of the 2018–2019 Jeep Wrangler JL 2 Door. Designed by off-road enthusiasts for off-road enthusiasts, these coil springs provide a balanced lift that enhances your Jeep’s capability without compromising on-road comfort. Whether you’re tackling rugged trails or cruising city streets, these springs deliver reliable performance and improved vehicle stance.

Superlift has been a trusted name in suspension systems since 1975, combining decades of experience with a passion for trucks and off-road vehicles. These coil springs are crafted to meet the demands of Jeep owners who want a dependable lift solution that performs better than advertised, backed by a company that stands behind its products with confidence.

Key Features

Superlift’s Dual Rate Coil Springs offer a range of benefits designed to improve your Jeep Wrangler’s suspension performance and ride quality:

• 4-inch rear lift height for enhanced ground clearance and aggressive stance
• Dual rate design provides a smooth ride on-road while maintaining firm support off-road
• Engineered specifically for the 2018–2019 Jeep Wrangler JL 2 Door for precise fitment
• Durable construction to withstand harsh off-road conditions and heavy loads
• Improves suspension articulation and wheel travel for better off-road traction
• Maintains factory ride quality and handling characteristics
• Corrosion-resistant finish for long-lasting durability
• Designed to work seamlessly with other Superlift suspension components

Construction & Design

These coil springs are manufactured using high-grade steel alloys, ensuring strength and resilience under demanding conditions. The dual rate design means the springs have two distinct spring rates: a softer initial rate for comfort during normal driving, and a firmer secondary rate that engages under heavier loads or during off-road articulation. This engineering approach balances ride quality with performance, making them ideal for Jeep owners who want versatility in their suspension setup.

Superlift’s commitment to quality is evident in the precise manufacturing tolerances and corrosion-resistant coatings applied to these springs, ensuring they maintain their performance and appearance over time, even in challenging environments.

Installation & Fitment

Installation of the Superlift 4-inch Lift Dual Rate Coil Springs is straightforward for experienced mechanics and professional installers. These springs are designed as a direct fit for the rear suspension of the 2018–2019 Jeep Wrangler JL 2 Door, requiring no major modifications. For optimal results, it is recommended to install these springs as part of a complete suspension lift kit or alongside compatible Superlift components.

While installation can be performed with standard suspension tools, consulting with a professional or Superlift’s technical support team is advised to ensure proper setup and alignment. This ensures your Jeep maintains safe handling characteristics and maximizes the benefits of the lift.

What's Included

• Pair of Superlift 4-inch Lift Dual Rate Coil Springs (Rear)
• Installation instructions

Ideal For

This product is ideal for Jeep Wrangler JL 2 Door owners from model years 2018 to 2019 who seek a reliable rear suspension lift to improve off-road capability without sacrificing on-road comfort. Whether you’re an off-road enthusiast looking to tackle trails or a daily driver wanting a more aggressive stance and improved ground clearance, these coil springs provide a balanced solution.