Firestone 4157 Coil-Rite Rear Air Helper Springs Kit for 96-10 Jeep Wrangler

Vehicle Fitment

• 1996-2006 Jeep Wrangler (Sport, Sahara, Rubicon, 2WD/4WD, 2.4L/4.0L)
• 2006-2010 Jeep Commander (Base, Limited, Overland, Sport, 3.7L/4.7L/5.7L)
• 2005-2010 Jeep Grand Cherokee (Laredo, Limited, Overland, SRT8, 2WD/4WD, 3.7L/4.7L/5.7L/6.1L)

Features

• Coil-Rite air helper springs improve ride comfort under heavy load
• Variable air pressure support adjusts spring rate as needed
• Installs inside existing rear coil springs without major modification
• Durable elastic polyurethane construction for long service life
• Supports approx. 500-1000 lbs of additional load per set
• Helps maintain level stance under cargo and towing
• Improves vehicle stability, braking, and handling with load
• Operates reliably across extreme temperatures (-40 °F to 180 °F)

Specifications

• Part Number: 4157 / W237604157
• Application: Rear axle - coil spring suspension
• Capacity: ~1,000 lbs per set (varies with GVWR & vehicle)
• Pressure Range: ~5 PSI min to ~35 PSI max
• Air Spring Diameter: ~5.50 inches
• Air Spring Length: ~5.00 inches
• No drilling for most vehicles
• Average installation time: ~1-2 hours

Included Components

• 2x Rear air helper springs
• 2x Support plates
• 1x Air line kit
• 2x Manual inflation valves
• Mounting hardware (brackets, bolts)

Product Description

The Firestone 4157 Coil-Rite Rear Air Helper Springs Kit is engineered for Jeep vehicles equipped with rear coil spring suspension that need enhanced load support and improved ride quality. These air helper springs fit inside your factory coil springs, creating a variable rate spring that helps keep your vehicle level under heavy cargo or trailer towing. The polyurethane construction delivers reliable performance across a wide range of temperatures and driving conditions.

Adjusting the air pressure is as simple as inflating a tire, allowing you to fine-tune the support for varying loads. The system helps reduce rear squat, improves stability, and enhances braking and handling when carrying passengers or cargo. Installation is straightforward with no drilling required on most applications, and typical install time is about 1-2 hours. Ideal for Jeep Wrangler (1996-2006), Commander (2006-2010), and Grand Cherokee (2005-2010) owners who want a smoother ride and better load control.