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  1. Vehicle Suspension
  2. Firestone
  3. Air Springs
  4. Towing/Load Leveling
  5. Rear Axle Suspension Enhancement
  6. Light Duty
THIS ITEM IS NOT A FIT FOR
2001 Lexus RX 300
Firestone

Firestone Coil-Rite Air Helper Springs - Rear Axle

Part Number: F4179
In Stock
$127.94
Retail:$208.83
You Save: $80.89
Vehicle Suspension
Not Confirmed to Fit

2001 Lexus RX 300

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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 vehicle, improve braking and handling, and reduce tire wear. Great Prices for the best vehicle suspension from Firestone. Firestone Coil-Rite Air Helper Springs - Rear Axle part number F4179 can be ordered online at etrailer.com or call 1-800-940-8924 for expert service.
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Firestone Vehicle Suspension - F4179

  • Air Springs
  • Towing/Load Leveling
  • Firestone
  • Rear Axle Suspension Enhancement
  • Light Duty
  • Suspension Only

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 vehicle, improve braking and handling, and reduce tire wear.


Features:

  • Provide extra support for your existing rear coil springs
    • Fit inside existing coil spring suspension on your vehicle
  • Keep your vehicle 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 vehicle
  • Made in the USA


Specs:

  • Load-leveling capacity: at least 500 lbs (at most 1,000 lbs)
    • Coil-Rite springs will not increase your vehicle'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


Note: The construction material of the fittings may vary.


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 vehicle to better handle a heavy load or trailer. Hauling heavy loads or towing a heavy trailer can make the rear of your vehicle 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 vehicle 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 vehicle 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 vehicle'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 vehicle's spring seats.



W237604179 Firestone Coil Rite Air Bags - Suspension Kit - Rear Axle

4179

Installation Details F4179 Installation instructions

This Product Fits The Following Vehicles



California residents: click here


Customer Satisfaction Score:

Ratings & Reviews

4.4

714 reviews
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 vehicle, improve braking and handling, and reduce tire wear.

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Show More Reviews

See what our Experts say about this Firestone Vehicle Suspension

  • Does Firestone Air Bag Kit # F4179 Come with Heat Shield
    The Firestone kit part # F4179 does not come with a heat shield nor is one required. It wouldn't get too hot and cause any probems.
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  • Recommended Suspension Enhancement To Haul A 350lb Wheelchair On The Back Of A 2007 Honda Odyssey
    From the top of the Draw-Tite Max-Frame Trailer Hitch Receiver # 75270, when installed on your 2007 Honda Odyssey, to the ground is going to be approximately 12-3/4". Adding on a 350lb wheelchair and 55lb carrier # FHG67ZR is definitely going to have the suspension sag a bit. Hitch adapters unfortunately reduce the capacity of the hitch when used by 50%, so you wouldn't be able to use one in this case since you need to be able to handle the weight. Instead of using an adapter to increase...
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  • Troubleshooting Leakages On Firestone Ride-Rite Air Helper Shocks on Ford F-150
    For your Firestone Ride-Rite Air Helper Springs, you can check the fittings for air leaks with an applied solution of soap and water. If a leak is detected, deflate the air spring by depressing the valve core. The tubing can easily be removed from the fittings by pushing the collar on the fitting towards the body of the fitting while pulling out the tube. Next, check the tubing connection to ensure that the air tubing is cut as square as possible and that it is pushed completely into...
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  • Troubleshooting Leak In Firestone Air Springs On Both Sides of Vehicle
    There's definitely a leak somewhere on your Firestone Air Spring System if the bags are bleeding out after only a few days. It's not too uncommon that the springs on both sides lose air as a result of this. The simplest way to try and locate where the leak is taking place is to apply a solution of soap and water to the fittings, air lines, and air bags while the system is fully inflated. If there's a leak you will see little air bubbles appear at the source within a couple seconds. If...
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  • Orientation of Spring, Air Line and Spacer Disc for Installing Firestone Kit # F4179
    The disc goes above the spring and the air line comes out of the bottom of the bag. If you check out the picture I attached you'll see a diagram of how it all goes together.
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    Image 1 for
  • Difference of Suspension Enhancement Springs on a 2007 Honda Odyssey
    Choosing between jounce-style springs, coil helper springs, and air springs depends on why you need them in the first place. All three improve your ride, absorb shock, and will help prevent your 2007 Honda Odyssey from sagging. However, the jounce-style are not engaged when the vehicle is not loaded and are there for additional support when it's needed. Air springs however are always being used to help your ride. Also, the psi can be adjusted based on the amount of weight in the vehicle....
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  • Troubleshooting Air Helper Spring Compressor that Runs Frequently
    I think your question got cut off, but it sounds like your air suspension kit has an onboard compressor that is seemingly turning off and on. This most likely due to a leak in the system. You can check the fittings for air leaks with an applied solution of soap and water. If a leak is detected, deflate the air spring by depressing the valve core. The tubing can easily be removed from the fittings by pushing the collar on the fitting towards the body of the fitting while pulling out the...
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  • Suspension Enhancement Recommendation for a 2010 Honda Odyssey to Tow Trailer Level
    Since both your vehicle manufacturer and your trailer manufacturer strongly recommend against the use of a weight distribution system I would also recommend against it. There are no modifications either that would allow you around this recommendation either. The best recommendation I can make for you would be rear suspension enhancement like the Fireston Air Helper Springs part # F4179. This will give you additional rear suspension support so that your tow vehicle will tow level. This...
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  • Rear Suspension Support Options for 2005 Acura MDX Towing 2800-lb Coleman Pop-Up Camper
    The 2005 Acura MDX has a maximum tow rating of 4500-lbs. You can check your owner's manual to confirm the rating for your particular vehicle. Your 2800-lb Coleman Westlake Pop-Up camper trailer is likely to be within its capacity even when fully loaded for a trip. Still, the sag you are experiencing may be remedied or at least reduced by a weight distribution hitch, which is a better option than air bags for towing. Since the vehicle is nearly 10 years old you might want to have a qualified...
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  • Lower Priced Rear Suspension Enhancement for 2006 Honda Pilot
    The most economically priced suspension enhancement kit we offer for your 2006 Honda Pilot is the Firestone Coil Rite kit part # F4179. This will do a great job at removing the sag and also doesn't break the bank. It's pretty easy to install too as the bags install by slipping into the rear coils.
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  • Recommended Suspension Enhancement for a 2007 Honda Odyssey
    The best option to reduce rear sag in your 2007 Honda Odyssey is to use the Firestone Coil-Rite Air Helper Springs item # F4179. These air bags have a 500 lbs capacity which should more than enough for your 1,700 lbs trailer. These air bags are inserted inside your Honda's rear coil springs. They reduce sag and create stability, which gives you a smoother ride and prevents your suspension from bottoming out. I have linked a review video below along with the installation instructions.
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  • Installation Instructions for Firestone Coil-Rite Air Helper Springs for a 2010 Honda Pilot
    The instructions for Firestone air bags # F4179 for the 2010 Honda Pilot are linked on the product page and on this page below. The instructions are not vehicle specific because this kit fits the Acura MDX and Honda Odyssey as well as the Pilot.
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  • Suspension Enhancement for a 2006 Honda Pilot with a Strut in the Center of the Coil Spring
    I spoke with my contact at Firestone and found out that some models of the 2006 Honda Pilot came with that strut while others did not. Since yours has it you cannot use the Coil-Rite springs # F4179. Since you have that strut, the only suspension enhancement option that will work are SuperSprings Coil SumoSprings, # CSS-1125R. These springs fit in the gaps of the coil spring. I have included a link to the installation details for you.
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  • Suspension Enhancement Recommendation for a 2010 Honda Pilot EX 4WD
    First thing you need to do is check your owners manual to determine if your vehicle is rated for use with weight distribution. Some vehicles aren't. Since your hitch is bent I would recommend you have a Honda service department check it out and determine if it can still be used. If the hitch is fatigued to the point of potential failure I cannot recommend you continue towing. Weight distribution systems are preferred for bumper pull style trailers like what you have. For suspension enhancement...
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  • What is the Correct Firestone Suspension Enhancement for a 2006 Honda Pilot
    The Firestone Air Helper Springs, # F4105, is not the correct part for a 2006 Honda Pilot. It is designed to specifically fit different vehicles so the size and shape is different than what your Pilot requires. You need # F4179 for a 2006 Honda Pilot. I have included a link to the instructions for the correct part for you. I have also included a link to all of the suspension enhancement parts for your vehicle.
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  • Suspension Enhancement for a 2006 Honda pilot EX
    There are a few different suspension enhancement systems you could use for your 2006 Honda Pilot. I have included a link to them for you. The Firestone Coil-Rite springs, # F4179, will replace the factory overload bumpers that are in the factory springs. I have included a link to the instructions for you to view.
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  • How Does the Firestone Coil-Rite Air Helper Springs, part # F4179 install on a 2006 Acura MDX
    If you have access to tools and have basic mechanical skills you should have no problem installing the Firestone Coil-Rite Air Helper Springs - Rear Kit, part # F4179, on the rear suspension of your 2006 Acura MDX. The first step you will need to do is jack up the rear wheels of your 2006 Acura MDX by the frame and support it with jack stands. Make sure your suspension is completely extended. Next, you will remove your coil springs and remove the overload bumpers inside the coil springs...
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  • Air Tubing to Replace Damaged Air Line For Firestone Air Suspension Installed on 2005 Honda Pilot
    Firestone does indeed offer replacement 1/4 inch air line. The length offered is 30 feet, part # F9416. When inserting the air line into the fittings, having a perfectly squared cut is crucial to avoid leakage. We recommend using a tubing cutter like part # AL10530.
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  • Will Suspension Enhancement System Work With 2005 Honda Pilot AWD
    I called my contact at Timbren about the Rear Suspension Enhancement System, part # THROD2, and I also called my contact at Firestone about part # F4179. If you have a strut that is running down through the middle of your rear coil springs then neither of these systems will work for your Pilot. These are installed inside the coil springs on your Pilot and will not affect the ride when the vehicle is not loaded down. These systems are intended to be used on a vehicle with a good working...
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  • Can Firestone Air Spring Kit F4135 Be Adapted to Fit 2005 Honda Pilot EX
    The air bags themselves in Firestone Coil-Rite kits # F4135 and # F4179 are different. This is not readily visible based on the photos of the two kits but my contact at Firestone confirmed that these two kits use different size air bladders and so they are not interchangeable between the 2005 Toyota 4Runner and the 2005 Honda Pilot EX. For your 2005 Honda Pilot EX you will need to order kit # F4179. The install instructions are linked for you. Often a tubing cutter # AL10530 will simplify...
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  • Suspension Enhancement Recommendation for a 2006 Honda Odyssey
    A suspension enhancement system will help to keep your 2006 Honda Odyssey more level, although a little sagging can still be expected with heavy loads. Since you indicated not having a need for the level ride height all the time, just when towing, I recommend the Firestone Coil-Rite Air Helper Springs, # F4179, which you can inflate and deflate for the best ride for a given situation. I have included a link to the installation details below. You can also add an on-board compressor like...
    view full answer...
  • Compressor for Air Spring Installation Leaking Air Pressure
    Air bag setups can develop leaks at the air spring itself but this is very rare. Usually the leak can be traced to a pinhole in the airline, an uneven tubing cut at a tee fitting or at a Schrader valve. The springs themselves are usually the least likely component to leak air. You can use soapy water to help you find any leaks but installing an on-board compressor will certainly take care of the problem too and better still it give you the absolute best setup for getting the most of out...
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Do you have a question about this Vehicle Suspension?


Info for this part was:

Employee Leah B
Updated by:
Leah B
Employee Mary K
Updated by:
Mary K
Employee Wilson B
Updated by:
Wilson B
Employee Daron K
Updated by:
Daron K
Employee Alex H
Updated by:
Alex H
Employee Mike L
Expert Research:
Mike L
Employee Michael H
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Michael H
Employee Jameson C
Expert Research:
Jameson C
Employee Brandon M
Expert Research:
Brandon M
Employee Adam R
Expert Research:
Adam R
Employee Tyler C
Written by:
Tyler C
Employee Jacob T
Video Edited:
Jacob T
Employee Chris R
Video Edited:
Chris R
Employee Jonathan Y
Video by:
Jonathan Y
Employee Robert C
Installed by:
Robert C

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