JKS Manufacturing JSPEC Dual Rate Coil Springs Kit

2007–2018 Jeep Wrangler JK

Part #: JSPEC2351

Overview

The JKS Manufacturing JSPEC 3.5-inch Dual Rate Coil Springs Kit is engineered specifically for the 2007–2018 Jeep Wrangler JK, delivering a balanced combination of lift, comfort, and off-road capability. Designed to provide a level 3.5-inch lift, this kit enhances ground clearance and suspension travel while maintaining a smooth and controlled ride on paved roads. Ideal for Jeep enthusiasts who demand both daily drivability and rugged off-road performance, these springs improve handling and vehicle stance without compromising comfort.

Whether you’re tackling loaded expeditions or light rock crawling, the JSPEC coil springs firm up under load to provide better control and articulation. The longer spring length accommodates longer shocks, increasing wheel travel and suspension articulation for improved off-road traction and durability.

Key Features

These dual rate coil springs incorporate advanced engineering to optimize ride quality and off-road performance:

• 3.5-inch level lift for balanced clearance and stance
• Dual rate design offers a smooth on-road ride with progressive firmness off-road
• Matching front and rear springs for consistent vehicle height and handling
• Longer spring length supports longer shocks, enhancing wheel travel
• Improved suspension articulation for better off-road control
• Designed to handle additional weight from gear and accessories
• Durable powder coat finish for corrosion resistance
• Engineered specifically for Jeep Wrangler JK (2007–2018) fitment

Construction & Design

JKS Manufacturing builds the JSPEC coil springs using high-quality steel alloys that provide excellent strength and durability under demanding conditions. The dual rate coil design features variable spring rates that adapt to different driving scenarios—softening for comfort during highway cruising and firming up when off-road articulation and load support are needed. The springs are precision wound to exact specifications, ensuring consistent performance and longevity.

Each spring is finished with a corrosion-resistant powder coat to protect against rust and environmental damage, extending the life of the suspension components. The longer spring length is carefully engineered to work seamlessly with extended shocks, maximizing suspension travel and articulation for improved off-road capability.

Installation & Fitment

The JSPEC 3.5-inch Dual Rate Coil Springs Kit is a direct fit replacement for the front and rear springs on 2007–2018 Jeep Wrangler JK models. Installation requires standard suspension disassembly and reassembly procedures, and it is recommended to have the work performed by a qualified technician or experienced off-road specialist. No major modifications are necessary, but pairing these springs with compatible longer shocks is essential to fully realize the increased wheel travel and suspension performance.

What's Included

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

Ideal For

This coil spring kit is perfect for Jeep Wrangler JK owners seeking a reliable 3.5-inch lift that balances on-road comfort with enhanced off-road capability. It is especially suited for those who carry additional gear or accessories, participate in light rock crawling, or embark on extended overland expeditions where suspension performance and vehicle clearance are critical.

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.