Firestone 4185 Coil-Rite Rear Air Helper Springs Kit for 09-19 Dodge/Ram 1500

Vehicle Fitment

• 2009-2010 Dodge Ram 1500 (2WD/4WD)
• 2011-2018 Ram 1500 (2WD/4WD)
• 2019 Ram 1500 Classic (2WD/4WD)

Features

• Coil-Rite air helper springs add adjustable support to rear coil suspension
• Improves ride level under load for hauling and towing
• Durable elastic polyurethane construction for long service life
• Adjustable air pressure allows variable spring rate
• Helps reduce rear squat and improve handling under load
• Enhances stability and braking effectiveness
• No drilling required for most installations
• Operates between cold and hot temperature extremes

Specifications

• Part Number: 4185 (W237604185)
• Application: Rear axle - coil spring suspension
• Air Spring Diameter: ~4.0 inches
• Air Spring Length: ~11.0 inches
• Capacity: ~500-1,000 lbs per set (not to exceed GVWR)
• Pressure Adjustable: ~5-70 PSI
• Material: Polyurethane air springs with steel support hardware
• Average install 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 4185 Coil-Rite Rear Air Helper Springs Kit is engineered specifically for Dodge and Ram 1500 pickup trucks with rear coil spring suspension. These air helper springs fit inside your existing rear coils to provide adjustable support that helps keep the truck level under varying loads like cargo or towing. Durable elastic polyurethane construction ensures long-lasting performance across hot and cold conditions, while the adjustable pressure allows you to fine-tune the spring rate from about 5 PSI up to 70 PSI based on load weight.

Designed for straightforward installation, this kit generally requires no drilling and installs in roughly 1-2 hours. The Coil-Rite system helps improve handling, braking effectiveness, and stability when your truck is loaded, while also reducing rear squat and tire wear. Ideal for owners of 2009-2019 Dodge/Ram 1500 and Ram 1500 Classic models who want better control and ride quality under load.