Firestone Coil-Rite Air Helper Spring Kit (REAR)

2007–2018 Jeep Wrangler 3.8L V6 / 3.6L V6

Part #: 4173

Overview

The Firestone Coil-Rite Air Helper Spring Kit is engineered to enhance the ride quality and handling of Jeep Wrangler models equipped with coil spring suspensions. Designed to fit seamlessly inside your vehicle’s existing rear coil springs, this air helper spring kit provides a variable spring rate that adapts to changing loads and road conditions. Whether you’re carrying heavy cargo or towing, Coil-Rite helps level your Jeep Wrangler, improving stability, braking efficiency, and overall control.

Ideal for Jeep Wrangler owners who demand a smoother, safer ride without sacrificing comfort, the Coil-Rite system allows you to fine-tune your suspension performance by adjusting air pressure as easily as inflating a tire. This flexibility ensures optimal support whether you’re on the highway, off-road, or navigating uneven terrain.

Key Features

The Firestone Coil-Rite Air Helper Spring Kit offers a range of benefits designed to improve your Jeep Wrangler’s suspension performance:

• Fits inside existing rear coil springs for a clean, factory-like installation
• Provides a variable spring rate that adjusts to load and road conditions
• Supports an additional 500 to 1000 lbs. per set, enhancing load-carrying capacity
• Enables easy air pressure adjustments to customize ride firmness and handling
• Improves vehicle leveling, braking, and handling under heavy loads
• Durable polyurethane construction resists wear, cracking, and weather extremes
• Operates reliably in temperatures ranging from -40°F (-40°C) to 180°F (82°C)
• Compatible with 2007–2011 Jeep Wrangler 3.8L V6, 2012–2017 Jeep Wrangler 3.6L V6, and 2018 Jeep Wrangler JK 3.6L V6 models

Construction & Design

Firestone Coil-Rite air helper springs are crafted from high-quality, elastic polyurethane, a material known for its durability and resistance to environmental stressors. This robust construction ensures long-lasting performance and comfort, even under demanding conditions. The air springs are designed to fit snugly inside your Jeep Wrangler’s coil springs, maintaining the original suspension geometry while providing additional support.

The innovative design allows the air helper springs to compress and expand with your vehicle’s suspension travel, delivering a smooth, controlled ride. The system’s ability to vary spring rate through air pressure adjustments offers a customizable driving experience tailored to your specific load and terrain.

Installation & Fitment

Installation of the Firestone Coil-Rite Air Helper Spring Kit is straightforward and requires no permanent modifications to your Jeep Wrangler’s suspension. The kit fits inside the rear coil springs of 2007–2018 Jeep Wrangler models with 3.8L or 3.6L V6 engines. It is compatible with the JK generation and earlier models within the specified years.

Most installations can be completed with basic hand tools and do not require specialized equipment. The system includes all necessary components for mounting and inflation, allowing you to quickly adjust air pressure to suit your load and driving conditions.

What's Included

• Two polyurethane air helper springs designed for rear coil springs
• Air lines and fittings for inflation and pressure adjustment
• Mounting hardware and installation instructions

Ideal For

This air helper spring kit is perfect for Jeep Wrangler owners who frequently carry heavy loads, tow trailers, or encounter rough terrain. It is especially beneficial for those seeking improved ride comfort, vehicle leveling, and enhanced handling without upgrading to a full suspension system. Whether you use your Wrangler for daily driving, off-roading, or work-related hauling, the Coil-Rite system provides reliable support and adaptability.

Firestone Airide is a major name in air suspension and air helper spring technology, offering solutions like Ride-Rite kits to support load handling and ride stability. For trucks, SUVs, and work vehicles that see towing or heavy cargo, Firestone systems help level the vehicle and improve control without sacrificing everyday comfort.