Firestone 4173 Coil-Rite Air Helper Spring Kit for Coil Suspension

The Firestone Coil-Rite Air Helper Spring Kit is engineered to enhance ride quality and load-carrying capability for vehicles equipped with coil spring suspension. These innovative air helper springs install inside your existing coil springs to create a variable spring rate system that adapts to changing load conditions.

Key Features:

• Installs inside existing coil springs for seamless integration
• Variable spring rate adjusts with air pressure for optimal performance
• Levels your vehicle under load for improved stability and handling
• Supports 500-1,000 lbs. per set (not to exceed vehicle's GVWR)
• Durable polyurethane construction for long-lasting reliability
• Operates in extreme temperatures from -40°F to 180°F
• Improves braking effectiveness and handling under heavy loads
• Easy adjustment—simply add or release air pressure as needed

Coil-Rite air helper springs provide on-demand load support that you control. Whether you're hauling cargo, towing a trailer, or navigating rough terrain, you can adjust the air pressure to match your needs—it's as simple as inflating a tire. The result is better vehicle leveling, reduced sag, and enhanced ride comfort even in adverse road conditions.

Constructed from high-quality polyurethane material, these air springs are built to withstand the rigors of daily use while maintaining their performance characteristics across a wide temperature range. The Coil-Rite system gives you the flexibility to fine-tune your suspension for empty or loaded conditions, ensuring optimal ride quality regardless of what you're carrying.