Rancho Sport Suspension System

2018–2023 Jeep Wrangler Unlimited 4-Door

RS66142B-2

Overview:

The Rancho 3-inch Sport Suspension System Component Box 2 is engineered specifically for the 4-door Jeep Wrangler JL Unlimited models from 2018 to 2023. Designed to enhance both on-road comfort and off-road capability, this suspension upgrade provides an additional 2 inches of ground clearance, making it ideal for trail enthusiasts and daily drivers alike. Featuring front and rear corner-specific progressive rate coil springs, this system maintains a balanced stance under heavy loads while ensuring compatibility with the Jeep’s factory electronic stability system.

This component box is part two of a two-box kit and is intended for those looking to improve their Jeep’s suspension geometry and performance without compromising safety or drivability. It supports tire sizes up to 35 inches, allowing for aggressive off-road setups while retaining excellent ride quality on pavement.

Key Features:

Rancho’s Sport Suspension System offers a comprehensive upgrade with features designed for durability, performance, and ease of use:

• 2-inch suspension lift providing increased ground clearance for off-road obstacles
• Front and rear corner-specific progressive rate coil springs tuned for superior ride comfort and load handling
• Compatibility with Jeep’s original electronic stability system (NHTSA FMVSS126 compliant)
• Supports up to 35-inch tires on 17-inch wheels with 4.5-inch backspacing
• Includes extended sway bar end links for improved suspension articulation
• Equipped with e-brake line relocation bracket to maintain proper brake function
• Heavy-duty bump stops to protect suspension components during extreme articulation
• Brackets fabricated from high-strength, low-alloy steel for long-lasting durability
• Designed for bolt-on installation with no major modifications required
• Compatible with aftermarket accessories such as bumpers, sliders, and winches (note: these may affect final lift height)

Construction & Design:

Rancho’s suspension components are crafted from premium materials engineered to withstand the rigors of off-road use. The coil springs feature a progressive rate design that adapts to varying load conditions, providing a smooth ride on highways and firm support on rugged trails. Brackets and hardware are constructed from high-strength, low-alloy steel, ensuring structural integrity and resistance to corrosion over time. The system is carefully calibrated to maintain factory ride height balance and vehicle stability, even when equipped with larger tires and additional accessories.

Installation & Fitment:

This suspension system is designed for straightforward bolt-on installation on 2018–2023 Jeep Wrangler Unlimited 4-door models, excluding diesel and 4XE variants. Non-Rubicon models will experience a slightly taller lift height compared to Rubicon trims. Installation requires ordering both component boxes (RS66142B-1 and RS66142B-2) for a complete kit. After installation, recalibration of advanced driver-assistance systems (ADAS) by a qualified technician is necessary to maintain warranty coverage and ensure proper vehicle operation.

What's Included:

• Four front and rear corner-specific progressive rate coil springs
• Front and rear extended sway bar end links
• E-brake line relocation bracket
• Bump stops for suspension protection
• All necessary mounting hardware

Note: Shocks are sold separately and are not included in this component box.

Ideal For:

This suspension system is perfect for Jeep Wrangler Unlimited owners seeking a balanced upgrade that enhances off-road capability without sacrificing daily driving comfort. It is especially suited for trail riders, rock crawlers, and enthusiasts who want to run larger tires up to 35 inches while maintaining factory electronic stability control and safety features. Additionally, it serves as a solid foundation for further suspension enhancements such as Rancho geometry correction brackets and adjustable control arms.

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.