Rancho Short Arm Suspension System Component

2018–2023 Jeep Wrangler Unlimited (Various Models)

RS66125B-1

Overview:

The Rancho Short Arm Suspension System Component is engineered to enhance the off-road capability and on-road comfort of the Jeep Wrangler Unlimited models from 2018 through 2023. Designed to deliver a 4.5-inch lift, this suspension upgrade provides increased ground clearance and improved wheel travel, making it ideal for trail riding, rock crawling, and daily driving. Featuring progressive rate coil springs and adjustable control arms, this system balances durability with ride quality for Jeep enthusiasts seeking a reliable and versatile suspension solution.

This component is part of a complete lift kit and is intended for both front and rear suspension upgrades, ensuring a balanced and stable ride. It is compatible with a wide range of Jeep Wrangler Unlimited trims, including Sport, Sahara, Rubicon, Moab, Willys, and special editions such as the 80th Anniversary and High Altitude models.

Key Features:

The Rancho Short Arm Suspension System Component incorporates advanced design elements and high-quality materials to deliver superior performance and longevity:

• 4.5-inch lift height for increased ground clearance and enhanced off-road capability
• Front and rear corner-specific progressive rate coil springs tuned for optimal on-road comfort and off-road articulation
• Adjustable upper and lower control arms for precise alignment and improved handling
• Heavy-duty front and rear adjustable track bars to maintain proper axle positioning
• Extended sway bar end links and bump stop spacers included for improved suspension travel and articulation
• Maintenance-free D2 high-articulation, grease-free bushings that reduce wear by allowing sleeve rotation without resistance
• Designed to accommodate up to 37-inch tires for aggressive off-road setups
• Complies with NHTSA FMVSS126 safety standards for vehicle stability
• Compatible with Jeep Wrangler Unlimited models excluding diesel engines; non-Rubicon models achieve slightly taller lift height

Construction & Design:

Rancho’s suspension components are crafted from high-strength, low-alloy steel to ensure durability and long service life under demanding conditions. The bolt-on design simplifies installation while maintaining structural integrity. The progressive rate coil springs are engineered to provide a smooth transition from comfortable daily driving to rugged off-road performance. The use of grease-free D2 bushings enhances articulation and reduces maintenance requirements, making this system both robust and user-friendly.

Installation & Fitment:

This component is Box 1 of 3 in the Rancho RS66125B master lift kit and must be combined with Boxes 2 and 3 for a complete suspension upgrade. Installation requires moderate mechanical skill and standard tools. When paired with Rancho RS55067 or RS999067 shocks featuring Dynamic Rebound Springs, an aftermarket driveshaft is necessary to maximize front axle articulation. However, shocks RS55065 or RS999065 do not require driveshaft modifications. Note that aftermarket accessories such as bumpers, sliders, and winches may affect overall lift height and tire clearance.

What's Included:

• Front and rear corner-specific progressive rate coil springs
• Upper and lower adjustable control arms
• Heavy-duty front and rear adjustable track bars
• Extended sway bar end links
• Bump stop spacers
• All necessary mounting hardware

Ideal For:

This suspension system component is ideal for Jeep Wrangler Unlimited owners who want to improve their vehicle’s off-road performance without sacrificing on-road comfort. It suits enthusiasts who frequently tackle challenging trails, rock crawling, or require additional ground clearance for larger tires up to 37 inches. It is also a great choice for those seeking a durable, maintenance-free suspension upgrade backed by Rancho’s limited lifetime warranty.

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.