JKS Manufacturing JSPEC 3.5in Dual Rate Coil Springs Kit: Jeep Wrangler JK 2 Door (2007-2018) w/ Front and Rear Springs

JKS Manufacturing JSPEC 3.5in Dual Rate Coil Springs Kit

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

JSPEC2351

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 JK 2 Door models from 2007 to 2018 and Jeep Grand Cherokee models from 2005 to 2010, this kit provides a balanced 3.5-inch lift that improves both aesthetics and performance. Whether you’re tackling rugged trails, carrying heavy gear, or cruising on pavement, these coil springs deliver a smooth, comfortable ride without sacrificing off-road control.

Ideal for Jeep enthusiasts seeking a reliable suspension upgrade, the JSPEC springs feature a dual rate design that adapts to varying terrain conditions. This means you get a compliant, comfortable ride on-road and firmer support when the suspension is under greater load off-road, ensuring better tire contact and improved traction.

Key Features:

The JSPEC 3.5-inch Dual Rate Coil Springs Kit combines innovative engineering with durable materials to meet the demands of serious Jeep owners. Key features include:

• 3.5-inch lift height for increased ground clearance and aggressive stance
• Dual rate coil design for smooth on-road comfort and firm off-road performance
• Complete matched set of front and rear springs for balanced suspension geometry
• Longer overall spring length to accommodate longer shocks and maximize wheel travel
• Engineered to maintain factory ride quality while enhancing load capacity
• Compatible with a wide range of Jeep Wrangler JK trims including Rubicon, Sahara, Sport, Sport S, X, and special anniversary editions
• Constructed to withstand heavy loads and harsh off-road conditions
• Improves articulation and stability during rock crawling and trail driving

Construction & Design:

JKS Manufacturing builds the JSPEC coil springs using high-quality steel alloys and precision manufacturing processes to ensure durability and consistent performance. The dual rate design features variable coil spacing and thickness, allowing the springs to compress progressively. This engineering approach provides a softer initial spring rate for comfort during normal driving and a firmer rate as the suspension compresses further, ideal for off-road articulation and load-bearing scenarios.

The longer spring length not only supports the 3.5-inch lift but also enables the use of longer shocks, which increases wheel travel and improves suspension articulation. This thoughtful design helps maintain factory-like handling characteristics while enhancing off-road capability.

Installation & Fitment:

The JSPEC 3.5-inch Dual Rate Coil Springs Kit is designed for direct fitment on 2007–2018 Jeep Wrangler JK 2 Door models and 2005–2010 Jeep Grand Cherokee vehicles. Installation typically involves removing the factory coil springs and replacing them with the JSPEC set. No major modifications are required, making it a straightforward upgrade for experienced DIYers or professional installers. The kit maintains proper suspension geometry and ride height, ensuring compatibility with existing suspension components and accessories.

What's Included:

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

Ideal For:

This coil spring kit is perfect for Jeep owners who want to improve their vehicle’s off-road performance without compromising daily driving comfort. It suits those who frequently carry heavy gear, enjoy rock crawling, or require additional ground clearance for trail obstacles. Whether preparing for extended expeditions or weekend adventures, the JSPEC springs provide a reliable suspension upgrade that balances comfort and capability.