Rancho One-Piece Coil Spring Kit

2007–2018 Jeep Wrangler JK Unlimited

RS66139B

Overview:

The Rancho One-Piece Coil Spring Kit is a premium suspension upgrade designed specifically for 4-door Jeep Wrangler JK Unlimited models from 2007 to 2018. Engineered to enhance both on-road comfort and off-road capability, this kit features front and rear progressive rate coil springs that provide a balanced ride quality. Ideal for Jeep enthusiasts who demand improved ground clearance and suspension performance without compromising daily drivability, this kit offers a reliable solution for trail-ready vehicles.

With a 2-inch lift, the Rancho coil spring kit allows installation of up to 33-inch tires, with the potential to accommodate 35-inch tires when combined with necessary trimming and aftermarket accessories. Tested to meet NHTSA FMVSS126 standards, it maintains compatibility with the Jeep’s factory electronic stability system, ensuring safety and performance remain uncompromised.

Key Features:

This coil spring kit delivers a comprehensive suspension upgrade with features tailored for Jeep Wrangler JK Unlimited owners seeking enhanced off-road performance and on-road comfort:

• 2-inch suspension lift providing additional ground clearance for off-road terrain
• Front and rear progressive rate coil springs tuned for superior ride quality
• Compatible with Jeep’s original electronic stability control system
• Supports up to 33-inch tires on 17-inch wheels with 4.5-inch backspacing
• Maintains use of original equipment wheels and tires
• Includes front bump stops and rear brake line relocation brackets for proper fitment
• Tested and compliant with NHTSA FMVSS126 safety standards
• Designed to work seamlessly with Rancho geometry correction brackets and adjustable control arms (sold separately)
• Limited lifetime warranty from Rancho for long-term peace of mind

Construction & Design:

Rancho’s coil springs are crafted from high-quality steel alloys engineered for durability and consistent performance under demanding conditions. The progressive rate design ensures the springs provide a smooth, comfortable ride during everyday driving while progressively stiffening under heavier loads or rough terrain to prevent bottoming out. This dual-purpose engineering balances comfort and capability, making it ideal for Jeep Wrangler JK Unlimited owners who use their vehicles both on and off the road.

All components, including bump stops and brake line relocation brackets, are precision manufactured to fit the Jeep Wrangler JK chassis perfectly, ensuring reliable installation and long-lasting performance.

Installation & Fitment:

The Rancho One-Piece Coil Spring Kit offers a straightforward bolt-on installation process that requires no major modifications to the vehicle’s frame or suspension. Designed specifically for 2007–2018 Jeep Wrangler JK Unlimited 4-door models, the kit fits factory wheels and tires and maintains compatibility with the vehicle’s electronic stability system. While the kit supports 33-inch tires out of the box, fitting 35-inch tires may require trimming and consideration of aftermarket accessories such as bumpers, sliders, and winches, which can affect lift height.

For optimal suspension geometry and enhanced performance, Rancho recommends pairing this kit with their geometry correction brackets and adjustable control arms, available separately.

What's Included:

• Front progressive rate coil springs
• Rear progressive rate coil springs
• Front bump stops
• Rear brake line relocation brackets
• All necessary mounting hardware

Ideal For:

This coil spring kit is perfect for Jeep Wrangler JK Unlimited owners who want to improve their vehicle’s off-road capability without sacrificing on-road comfort. It suits enthusiasts who regularly tackle trails and rough terrain but still rely on their Jeep for daily driving. Additionally, it is an excellent choice for those planning to upgrade tire size up to 33 inches or slightly larger with modifications.

Fitment Summary

• Jeep Wrangler 70th Anniversary (2011)
• Jeep Wrangler 75th Anniversary (2016)
• Jeep Wrangler Rubicon (2007–2017, 2018 JK)
• Jeep Wrangler Sahara (2007–2017, 2018 JK)
• Jeep Wrangler Sport (2010–2017, 2018 JK)
• Jeep Wrangler Sport S (2016, 2018 JK)
• Jeep Wrangler Unlimited 70th Anniversary (2011)
• Jeep Wrangler Unlimited 75th Anniversary (2016)
• Jeep Wrangler Unlimited Rubicon (2007–2017, 2018 JK Unlimited)
• Jeep Wrangler Unlimited Sahara (2007–2017, 2018 JK Unlimited)
• Jeep Wrangler Unlimited Sport (2010–2017, 2018 JK Unlimited)
• Jeep Wrangler Unlimited Sport S (2016, 2018 JK Unlimited)
• Jeep Wrangler Unlimited X (2007–2010)
• Jeep Wrangler X (2007–2010)

Rancho is a performance suspension and shock brand for trucks, SUVs, and Jeeps, offering shocks/struts, steering stabilizers, leveling kits, and lift systems built for trail and daily use. Their products are aimed at improving control and stability on rough terrain while maintaining everyday drivability—ideal for rigs that tow, haul, and still see dirt on the weekends.