Firestone "Coil-Rite" air bag helper springs are designed to fit inside the existing coil spring suspension creating a variable rate spring. These air bags are made of durable, elastic polyurethane providing years of comfort and stability to your vehicle. "Coil-Rite" air bags enable adjustment for varying loads and road conditions by inflating or deflating the springs. Performance can be altered as easily as inflating a tire. Installed between the frame of the vehicle and the suspension providing load support through the use of air pressure.

Features and Benefits

  • Easy installation (1 to 2 hours)
  • Kit includes (2) air bag helper springs and any required hardware
  • Will handle loads capacities up to 500-1000 lbs*
  • Reduce suspension fatigue
  • Improve steering and balance
  • Increase vehicle stability
  • Prevent "bottom" out
  • Limited Lifetime Warranty

Installation Notes

1. Do NOT exceed the vehicles Recommended Gross Vehicle Weight Rating (GVWR)

Tech Specs

Download Instructions 4135 Instructions
Level Load Capacity: 500 lbs to 1000 lbs
Average Install Time: 1 to 2 hours
Front or Rear Axle: REAR
Drilling Required (Yes or No): NO
Weight: 10 lbs.
Part 4135 fits:
  • 2013 Toyota FJ Cruiser
  • 2012 Toyota FJ Cruiser
  • 2011 Toyota FJ Cruiser
  • 2010 Toyota FJ Cruiser
  • 2009 Toyota FJ Cruiser
  • 2008 Toyota FJ Cruiser
  • 2007 Toyota FJ Cruiser

Customer Questions & Answers

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Will these work with 2.5" lifted rear coil springs?
No, these air bags are for stock coil springs only.


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