Firestone 4164 Coil-Rite Rear Air Helper Springs Kit for 08-22 Toyota/Infiniti

Vehicle Fitment

• 2008-2021 Toyota Land Cruiser (Base; 5.7L)
• 2020-2021 Toyota Land Cruiser Heritage Edition (5.7L)
• 2008-2016 Toyota Sequoia (Limited, Platinum, SR5; 4.7L/5.7L)
• 2009-2012 Lexus LX570 (Base; 5.7L)
• 2016-2018 Infiniti QX80 (Base, Limited; 5.6L)
• 2019-2020 Infiniti QX80 (Limited, Luxe; 5.6L)
• 2021-2022 Infiniti QX80 (Luxe, Premium Select, Sensory; 5.6L)

Features

• Coil-Rite air helper springs improve rear suspension support under load
• Installs inside existing rear coil springs without drilling required
• Adjustable air pressure to fine-tune spring rate for different loads
• Durable elastic polyurethane construction for long service life
• Supports approximately 500-1,000 lbs per set (do not exceed GVWR)
• Enhances stability, braking performance, and handling under load
• Helps maintain a level vehicle stance and reduce rear squat
• Operates reliably in extreme temperature ranges

Specifications

• Manufacturer Part Number: 4164 / W237604164
• Application: Rear axle - coil spring suspension
• Air Spring Diameter: ~5.5 inches
• Air Spring Length: ~10 inches
• Capacity: ~1,000 lbs per set (varies with vehicle & GVWR)
• Pressure Adjustable: Yes, manual inflation valves
• No drilling required for installation
• 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 4164 Coil-Rite Rear Air Helper Springs Kit is engineered for SUVs with rear coil spring suspension that need additional load support and improved ride quality. These helper springs fit inside the factory coil springs to create a variable spring rate that helps keep your vehicle level under heavy cargo or towing conditions. The durable elastic polyurethane construction ensures long-lasting performance while coping with extreme temperatures.

Adjusting the air pressure in the Coil-Rite springs is as easy as inflating a tire, letting you fine-tune the suspension for varying loads. This kit helps reduce rear squat, improve handling and braking effectiveness under load, and maintain proper tire contact with the road. Installation is straightforward and typically takes about one to two hours, with no drilling required for most applications. Ideal for Toyota Land Cruiser, Sequoia, Lexus LX570, and Infiniti QX80 owners looking to enhance stability and load carrying capability.