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Vehicle Suspension > 2004 > Ford > Freestar

Firestone Vehicle Suspension for the Ford Freestar, 2004

Firestone Vehicle Suspension

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Code:   F4151



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Firestone Coil-Rite Air Helper Springs - Rear Axle - Ford Freestar, 2004

For safety and stability, air springs are the perfect partner for your rear suspension when you are hauling heavy loads. Springs fit inside existing coil springs to help level your Ford Freestar, improve braking and handling, and reduce tire wear.


  • Provide extra support for your existing rear coil springs
    • Fit inside existing coil spring suspension on your Ford Freestar
  • Keep your Ford Freestar level when you are hauling a heavy load
    • Improve steering control and balance
    • Level your headlight beams
    • Reduce tire wear
  • Maintain even load distribution with air pressure, leveling off-center loads
    • Air bags adjust manually, side to side, with individual inflation valves
  • Enable more effective braking and handling
    • Work under heavy loading and adverse road conditions
  • Increase stability to promote a smoother ride and prevent bottoming out
  • Made of durable, elastic polyurethane for years of comfort and stability
  • Include all materials necessary for installation
    • Brackets, air springs, hardware, air line and separate valves for manual inflation
    • Switches and gauges, compressors, and air tanks (sold separately) are available for quick and easy air spring inflation/deflation from inside your Ford Freestar
  • Made in USA


  • Load-leveling capacity: at least 500 lbs (at most 1,000 lbs)
    • Coil-Rite springs will not increase your Ford Freestar's weight-carrying capacity. Do not exceed the manufacturer's recommended weight limit.
  • Adjustable air pressure: 5 psi to 35 psi
  • Limited lifetime warranty on air springs
  • 2-Year limited warranty on hardware

Firestone Coil-Rite Air Spring Basics

Firestone Coil-Rite springs fit inside your existing rear coil springs to maximize the effectiveness of your suspension system. The added cushion provided by the air springs allows your Ford Freestar to better handle a heavy load or trailer. Hauling heavy loads or towing a heavy trailer can make the rear of your Ford Freestar sag and the front end rise. This puts more strain on your rear axle and reduces contact between your front tires and the road, causing problems with braking, steering control and traction. By adding air springs to your rear suspension, you can help to level your Ford Freestar for more effective braking and handling under heavy loading or when you encounter adverse road conditions. The air springs also help to level your headlight beams and reduce wear on your tires.

Firestone Coil-Rite airline installation

Adjustable Air Pressure

The air pressure in your Coil-Rite springs can be adjusted manually, side to side, to compensate for off-center loads. A centered load improves the stability of your Ford Freestar by reducing body roll. The air springs will also help to absorb road shock and soften contact between your axle and frame. This prevents bottoming out, thus improving ride comfort. Route the air line tubing for the springs to your Ford Freestar's bumper to provide easy access to the manual inflation valves.

Firestone Coil-Rite air spring components

Air Spring Construction

Coil-Rite springs are constructed of durable, elastic polyurethane to ensure years of service. Single replacement springs (sold separately) are available for maintenance to an existing Coil-Rite kit.

Air Spring Installation

The Coil-Rite springs install inside your existing coil springs. The custom-fit springs attach to your Ford Freestar's spring seats.

4151 Firestone Coil Rite Air Bags - Rear Axle

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Customer Reviews

Firestone Coil-Rite Air Helper Springs - Rear Axle - F4151

Average Customer Rating:  ratingratingratingratingrating5.0 out of 5 stars   (1 Customer Reviews)

- F4151

ratingratingratingratingrating by: Kevin S.08/24/2011

Is this review helpful?

I installed this in about an hour or so. It could use more hose protection, I put a larger hose over it in some places, just to be safe. I will use it under a load this weekend. 22640

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Ford Freestar Accessories

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