Rancho Sport Suspension System

2018–2023 Jeep Wrangler Unlimited 4-Door

RS66142B-1

Overview:

The Rancho 3-inch Sport Suspension System Component Box 1 is engineered specifically for the 2018 to 2023 Jeep Wrangler Unlimited 4-door models. Designed to enhance both on-road comfort and off-road capability, this premium suspension upgrade provides a reliable 2-inch lift with the potential to fit tires up to 35 inches. Ideal for Jeep enthusiasts who demand improved ground clearance and suspension performance without compromising factory electronic stability systems, this kit prepares your Wrangler for trail adventures, rock crawling, and everyday driving with confidence.

Built to meet stringent safety standards, the system is tested to comply with NHTSA FMVSS126 and integrates seamlessly with your vehicle’s advanced driver-assistance systems (ADAS), provided proper recalibration is performed post-installation. Rancho’s suspension solution balances rugged off-road readiness with refined on-road handling, making it a versatile upgrade for Jeep owners.

Key Features:

This suspension system offers a comprehensive set of features designed to optimize your Jeep Wrangler’s ride quality and off-road performance:

• Front and rear corner-specific progressive rate coil springs tuned for superior comfort and performance
• 2-inch lift providing additional ground clearance for off-road obstacles and larger tires
• Compatibility with Jeep factory electronic stability control systems, maintaining vehicle safety features
• Designed to accommodate up to 35-inch tires on 17-inch wheels with 4.5-inch backspacing
• Includes extended sway bar end links and e-brake line relocation bracket for proper suspension geometry
• Brackets fabricated from high-strength, low-alloy steel for durability and long service life
• Maintains level stance and ride height under heavy loads with progressive rate springs
• Tested to meet NHTSA FMVSS126 safety standards
• Supports use of original equipment wheels and tires without modification
• Limited lifetime warranty from Rancho for peace of mind

Construction & Design:

The Rancho Sport Suspension System is engineered with precision and durability in mind. The coil springs are corner-specific and progressive rate, meaning they provide a smooth ride on pavement while firming up under load for off-road stability. All brackets and hardware are constructed from high-strength, low-alloy steel, ensuring resistance to wear and corrosion in harsh environments. The design maintains the Wrangler’s factory suspension geometry and electronic stability system compatibility, preserving vehicle safety and handling characteristics.

Each component is rigorously tested to meet federal safety standards, ensuring reliable performance both on and off the trail. The system’s design allows for easy integration with additional Rancho suspension upgrades such as geometry correction brackets and adjustable control arms, enabling further customization and enhanced suspension tuning.

Installation & Fitment:

The Rancho 3-inch Sport Suspension System Component Box 1 features a bolt-on installation process that is straightforward for experienced DIYers or professional installers. The kit is designed specifically for 4-door Jeep Wrangler JL Unlimited models from 2018 through 2023, excluding diesel and 4XE variants. Non-Rubicon models will achieve a slightly taller lift height compared to Rubicon trims.

Installation requires recalibration of the vehicle’s advanced driver-assistance systems (ADAS) by a qualified technician to maintain warranty coverage and ensure proper system function. This suspension kit ships in two boxes; Box 1 (RS66142B-1) must be ordered together with Box 2 (RS66142B-2) for a complete lift system.

What's Included:

• Four front and rear corner-specific progressive rate coil springs
• Bump stops for front and rear suspension
• Front and rear extended sway bar end links
• Emergency brake line relocation bracket
• All necessary hardware for installation
• Note: Shocks are sold separately

Ideal For:

This suspension system is perfect for Jeep Wrangler Unlimited owners seeking a balanced upgrade that enhances off-road capability without sacrificing on-road comfort. It is ideal for trail riders, rock crawlers, and daily drivers who want to fit larger tires and gain additional ground clearance while maintaining factory safety features and ride quality. Enthusiasts looking to customize their suspension further can combine this kit with Rancho’s geometry correction brackets and adjustable control arms for a complete performance package.

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.