Firestone 4124 Coil-Rite Rear Air Helper Spring Kit

Vehicle Fitment

• Fits vehicles with rear coil spring suspension (universal application)
• Commonly used on SUVs, light trucks, vans, and similar coil-spring vehicles

Features

• Coil-Rite rear air helper spring kit designed for coil spring suspensions
• Air springs install inside existing coil springs for extra support
• Adjustable air pressure to fine-tune load support and ride height
• Helps maintain level stance and reduce rear sag under load
• Improves handling, braking effectiveness, and vehicle stability
• Reduces tire wear and helps maintain proper headlight aim
• No-drill installation using existing mounting locations
• Durable elastic polyurethane air springs for long service life

Specifications

• Brand: Firestone Ride-Rite
• Part Number: 4124 (Coil-Rite Rear Air Helper Spring Kit)
• Application: Rear coil spring suspension support
• Support Capacity: Adjustable (generally ~500-1,000 lbs per set)
• Pressure Range: Approximately 5-35 PSI adjustable
• Material: Elastic polyurethane air springs
• Installation: No-drill design on compatible vehicles
• Use: Manual inflation valves supplied (compressor sold separately)

Included Components

• 2x Coil-Rite rear air helper springs
• Air line tubing
• 2x Manual inflation valves
• Mounting hardware and brackets
• Installation instructions

Product Description

The Firestone 4124 Coil-Rite Rear Air Helper Spring Kit is engineered to provide adjustable support for vehicles equipped with **rear coil spring suspension systems**. These air helper springs fit **inside existing coil springs** and let you modify the spring rate by adjusting air pressure, helping keep your vehicle level when hauling cargo or towing loads and improving overall ride stability and handling.

Designed for easy installation without drilling on many compatible vehicles, the kit includes air springs, air line tubing, manual inflation valves, and all necessary hardware. By adjusting the air pressure (typically in the range of about 5-35 PSI), you can increase rear support, reduce sag, enhance braking performance, and maintain headlight aim. The elastic polyurethane construction is built to withstand a wide range of temperatures and provides lasting durability for daily driving, towing, and other load-bearing situations.