JKS Manufacturing JSPEC Dual Rate Coil Springs Kit

2007–2018 Jeep Wrangler, 2005–2010 Jeep Grand Cherokee

JSPEC2350

Overview:

The JKS Manufacturing JSPEC 3.5-inch Dual Rate Coil Springs Kit is engineered to enhance your Jeep’s clearance, ride quality, and off-road capability. Designed specifically for Jeep Wrangler models from 2007 to 2018 and Jeep Grand Cherokee models from 2005 to 2010, this kit includes both front and rear coil springs to provide a balanced 3.5-inch lift. Whether you’re tackling rugged trails or cruising city streets, these springs deliver a smooth, comfortable ride on-road while firming up off-road for improved vehicle control and stability.

Ideal for Jeep enthusiasts who demand versatility, the JSPEC coil springs adapt to varying terrain and load conditions, making them perfect for everything from daily driving to serious off-road adventures. Their longer overall length also allows the use of longer shocks, increasing wheel travel and suspension articulation for enhanced performance.

Key Features:

JKS JSPEC coil springs combine innovative design with durable construction to meet the demands of Jeep owners seeking both comfort and capability:

• 3.5-inch lift height for increased ground clearance and aggressive stance
• Dual rate spring design provides a smooth ride on pavement and firmer support off-road
• Complete matched set of front and rear coil springs for balanced suspension performance
• Longer spring length accommodates longer shocks, enabling greater wheel travel
• Engineered to maintain factory ride quality while enhancing off-road control
• Compatible with a wide range of Jeep Wrangler JK Unlimited trims including Rubicon, Sahara, Sport, Sport S, X, and special editions
• Constructed to handle additional weight from gear, passengers, or accessories without compromising performance

Construction & Design:

JKS Manufacturing builds the JSPEC coil springs using high-quality steel alloys and precision engineering to ensure durability and consistent performance. The dual rate design features variable coil spacing and thickness, allowing the springs to compress progressively. This means the springs provide a softer initial rate for comfort during normal driving and transition to a firmer rate under heavier loads or rough terrain, improving stability and control.

The springs are powder-coated for corrosion resistance, ensuring long-lasting protection against the elements. Their robust construction supports extended use in demanding off-road conditions without sagging or loss of performance.

Installation & Fitment:

The JSPEC 3.5-inch Dual Rate Coil Springs Kit is designed as a direct fit replacement for the front and rear springs on compatible Jeep Wrangler JK Unlimited and Grand Cherokee models. Installation typically requires standard suspension tools and moderate mechanical skill. No major modifications are necessary, but professional installation is recommended to ensure proper alignment and suspension geometry.

These springs are compatible with factory shocks as well as aftermarket longer shocks, which are recommended to maximize wheel travel and suspension articulation after the lift.

What's Included:

• Front coil springs (pair)
• Rear coil springs (pair)
• Installation instructions

Ideal For:

The JKS JSPEC Dual Rate Coil Springs Kit is perfect for Jeep owners who want a reliable lift that improves off-road capability without sacrificing on-road comfort. Whether you’re loading your Jeep for extended expeditions, navigating rocky trails, or simply seeking a more aggressive stance and improved clearance, these springs deliver versatile performance for daily driving and weekend adventures alike.

JKS Manufacturing builds Jeep and off-road suspension parts—lift systems, control arms, track bars, disconnects, and supporting hardware—engineered for articulation and durability. It’s a popular choice for Wrangler and Gladiator owners looking to improve clearance, ride quality, and capability for real trail use.