Firestone Coil-Rite Air Helper Spring Kit (REAR)

1997–2010 Jeep Grand Cherokee / Commander / Wrangler Various Engines

Part #: 4157

Overview

The Firestone Coil-Rite Air Helper Spring Kit is engineered to enhance the ride quality and handling of Jeep vehicles equipped with coil spring suspensions. Designed specifically for the rear coil springs of Jeep Grand Cherokee, Commander, and Wrangler models from 1997 to 2010, this kit provides a variable spring rate that adapts to changing loads and road conditions. By fitting inside your existing coil springs, the Coil-Rite system helps level your vehicle, improve braking efficiency, and maintain stability even under heavy loads or challenging terrain.

This kit is ideal for Jeep owners who frequently carry heavy cargo, tow trailers, or encounter uneven road surfaces and want to maintain a smooth, controlled ride without sacrificing comfort or safety.

Key Features

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

• Fits inside existing rear coil springs for seamless integration
• Provides a variable spring rate adjustable via air pressure
• Supports additional loads of 500 to 1000 lbs per set, depending on inflation
• Improves vehicle leveling, reducing sag and sway under heavy loads
• Enhances braking and handling stability in adverse conditions
• Easy to adjust air pressure with a simple inflation process similar to a tire
• Durable polyurethane construction resists wear and environmental damage
• Operates reliably in extreme temperatures from -40°F to 180°F (-40°C to 82°C)
• Compatible with multiple Jeep models and engine configurations from 1997 to 2010

Construction & Design

The Coil-Rite air helper springs are crafted from high-quality, elastic polyurethane, a material chosen for its durability and flexibility. This construction allows the air springs to absorb shocks and maintain consistent support without cracking or degrading over time. The design fits snugly inside your vehicle’s existing coil springs, preserving the original suspension geometry while providing additional load-carrying capacity. The air springs are engineered to withstand extreme temperatures and harsh road conditions, ensuring long-lasting performance and reliability.

Installation & Fitment

Installation of the Firestone Coil-Rite kit is straightforward and requires no permanent modifications to your vehicle’s suspension. The air helper springs are inserted inside the rear coil springs and connected to an air inflation system that allows you to adjust pressure as needed. This adjustability lets you tailor the spring rate to your current load and driving conditions, providing a customizable ride experience. The kit is designed to fit the following Jeep models and engine options:

• 1997–2006 Jeep Wrangler 4.0L Inline 6
• 1997–2002 Jeep Wrangler 2.5L Inline 4
• 2005–2010 Jeep Grand Cherokee 3.7L V6
• 2005–2010 Jeep Grand Cherokee 5.7L Hemi
• 2006–2010 Jeep Grand Cherokee 6.1L SRT8
• 2006–2010 Jeep Commander 3.7L V6
• 2006–2010 Jeep Commander 5.7L Hemi

What's Included

• Two Firestone Coil-Rite air helper springs (rear)
• Air inflation fittings and hardware
• Installation instructions

Ideal For

This air helper spring kit is perfect for Jeep owners who:

• Regularly haul heavy cargo or tow trailers
• Seek improved ride comfort and vehicle stability
• Drive on rough, uneven, or off-road terrain
• Want an adjustable suspension solution without permanent modifications
• Own Jeep Grand Cherokee, Commander, or Wrangler models from 1997 to 2010

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.