4135 - Firestone rear airbags  

If you’re looking for a smoother ride for your vehicle that has a coil spring suspension, Firestone Coil-Rite air helper springs are what you need.

• Designed to fit inside existing coil springs to create a variable spring rate, Coil-Rite will help level your vehicle and assist with more effective braking and handling, even under heavy loading and adverse road conditions.
• Coil-Rite enables you to control the air pressure in the air helper springs so you can make adjustments for varying loads and road conditions.
• Spring performance can be altered as easily as inflating a tire.Firestone 
• Coil-Rite air helper springs are made of durable, elastic polyurethane, providing years of comfort and stability to your vehicle.
• The air springs will support 500-1000 lbs. per set (not to exceed vehicle's GVWR).
• Coil-Rite Air Helper Springs are designed to work in temperatures between 180 °F (82 °C) and -40 °F (-40 °C).
• Designed for stock height coils.  Lift coils require modification. 
• Installation instructions can be found HERE

• NOTE: Custom modifications may be required for lifted applications to ensure air bags are properly supported.  If using on a lifted application, do not follow Firestone bump stop/jounce cut instructions.  You will need to determine where to cut based on your lift amount.