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.
*Parts are for USA spec vehicles, please contact us to verify fitment on JDM & international models.
· · · SHIPPING · · ·
Free shipping across the contiguous 48 United States (excludes Hawaii and Alaska). Item(s) ships on the same day or within 1 business day. Delivery time is within 2 to 4 business days excluding next day deliveries. Orders over $750 require signature for delivery.
Canada customers - If eBay does not collect import & duty fees during checkout, the shipping carrier will collect them prior to delivery.
· · · RETURNS · · ·
Your complete shopping satisfaction is our #1 priority. If an item you ordered from us does not meet your expectations, please contact us within 30 days of receiving the item(s). If your order arrives damaged from shipping please contact us and we will provide a prepaid return label to send back for a replacement or refund.
Returned items must be in the original packaging (including plastic wrapped items) and in brand new condition.
Any returns received installed, mounted, used or missing components will be subject to return fee's.
· · · PAYMENTS · · ·
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· · · FEEDBACK · · ·
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· · · CONTACT US · · ·
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