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Firestone Coil-Rite Air Helper Springs - Rear Axle

Firestone Coil-Rite Air Helper Springs - Rear Axle

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Firestone Light Duty Vehicle Suspension - F4150
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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. Lowest Prices for the best vehicle suspension from Firestone. Firestone Coil-Rite Air Helper Springs - Rear Axle part number F4150 can be ordered online at or call 1-800-940-8924 for expert service.
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Firestone Vehicle Suspension

  • Air Springs
  • Rear Axle Suspension Enhancement
  • Firestone
  • Light Duty

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.


  • 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


  • 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

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.

W237604150 Firestone Coil Rite Air Bags - Suspension Kit - Rear Axle

Firestone 4150

Item # F4150

Installation Details F4150 Installation instructions

This Product Fits The Following Vehicles

Customer Reviews

Firestone Coil-Rite Air Helper Springs - Rear Axle - F4150

Average Customer Rating:  4.5 out of 5 stars   (455 Customer 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.

2008 Nissan Armada

Installed on the rear coils of a 2008 Nissan Armada after removing factory air shocks and installed a 2" lift. Easy installation and works perfect for my needs. Only suggestion would be to add a "T" to the kit so you can inflate at one point versus two.

Ryan, are these still working well and how much do you haulwith how much tongue weight. Thank you.
-- comment by: Brent S - 02/09/2016


These air bags are amazing! I have a 20' boat and hitch box I often use. The ride was horrible in my Armada when loaded down, but the air bags made a tremendous difference. The ride is smooth with no more bouncing around or bottoming out and the steering and handling are greatly improved. Installation was simple and took less than an hour for a guy who's not so mechanically inclined. When installing, use zip ties to keep bags compressed and then clip the zip ties once the bags are in the springs.

Nissan Armada

Overall, i like these bags a bunch!!! lifts beyond my expectations!! I carry a hitch mount 2 dirtbike carrier. My Armada suffers from severe squat and suspension bottom out to start with. with the dirtbike carrier, the truck felt as if the front wheels were lifting off the ground... and the carrier would drag upon entry to most driveways.. I will be trying out for the first time in about 3 days. So far, the ride is awesome!!! a lot better ride and control (which I did not expect). Installation does take some planning... do trial fit everything you can... that includes the air line pathway and the location of your air valve... I thought I had everything done and perfect but when I mounted my air valve into the hitch hardware, I couldn't air the valve up.. the hitch plate was too thick... I moved the valve to my thin (plastic) bumper... now works fine... see the pics... If there is something I would like to add, it would be the " Air Lift WirelessONE Compressor System for Air Helper Springs - Hand-Held Remote - Single Path
Item # AL25870"... this would make a complete solution! But there is one BIG "don't like", the air bag valve does point the line straight down toward the ground... with this install, this is now the lowest part of my suspension... I do have a concern when traveling in areas where clearance would be an issue... other than that, I'm excited (over airbags right)! enjoy the pics!

2010 Nissan Armada

Bags came quick and as described. I'm a professional technician so install was pretty easy. It is a little tough getting the bags in the springs but with some patience they go in. Can't wait to hook up my travel trailer and see how well they work.

2010 Nissan Armada SE

Hi Tommy,What was the difference in ride handling when you hooked up you TT? Do you think an amateur could install these without special tools? Thanks,Alvin
-- comment by: Alvin N - 07/01/2014
Alvin, the ride was definitely better with the trailer hooked up after I installed the airbags. I run them at 10 psi normally and 25 with trailer hooked up. With no trailer the rear feels more planted to the road and towing it feels more stable. I still use leveling bars to help with the weight but I definitely recommend these if your going to tow. As for install its not difficult but just a pain to get them squeezed down and pushed through the springs. After that the hoses are simple push ins and just be sure to route them so they can move and away from the exhaust. Tom D.
-- comment by: Tom D - 07/01/2014

2006 Nissan Armada

Just finished installing air spring and I am extremely vehicle is back to its original height........p.s customer service is outstanding.thank you.


This product helped my vehicle go faster comfortably while towing and helped reduce sagging.

2015 Nissan Armada

Didn't work as advertised. 2015 Nissan Armada has a soft suspension; camper drops rear end 1.25" but this only raised back up 0.25". The camper is well below the Armada's tow capacity so overweight can't be the reason this didn't work. Can't feel a difference going down the road.

It sounds like you need to distribute your weight in the trailer or whatever youre pulling. Or you could look into a weight distribution system. It will help with the sag and if you are experiencing any sway. Let me know your weight limit and I will look into a few for you.
-- Etrailer Expert Sierra K - 08/18/2021


Was just what I needed for my Armada. Really helped the ride, but the Armada was not up to pulling my new travel trailer. We upgraded to a Ram 2500.

2006 Nissan Armada

I installed the Firestone Coil-Rite helper springs on my 2006 Nissan Armada. The install went great, all done in about 30 minutes. My Armada used to sag 3 inches when my travel trailer (5,000 lbs) and 500 lb tongue weight before these were installed. Now with them installed it only sags 1inch and ride so much better.

I did this vs a weight distribution hitch as my Travel Travel wasn't really heavy.

I just drove it with 32 PSI from Atlanta to Orlando and back.. worked great no issues so far.


We purchased these to reduce the the sag in our 2017 Nissan Armada while towing our travel trailer. We paid someone to install them and it took them about 30 minutes. He mounted the filler nozzles just under the back bumper. The sag was significantly reduced and we didn't feel like the front of the truck was dolphining with every bump or wind gust.


Works great. I have them hooked to a compressor so I can inflate and deflate as needed. A great addition to the Armadas factory level system when pulling a heavy load.

Still working great.
Bob H - 06/17/2021


Has worked great on my SUV. Make sure you get the satellite air valve connection, makes it easy to check the air from your bumper.

2009 Nissan Armada

Hubby installed these today, so I can't comment on east of installation. We did already go for ride and the suspension has greatly improved! Also hooked up pour travel trailer and the vehicle no longer squats at all, of course we have the weight distribution hitch attached, but I can definitely tell a difference even without the trailer attached.


Easy to install. Vehicle now at proper ride height when towing.


I have been using them when I pull my trailer. It has done the job and helped with firming up the rear suspension

Works great. Only thing I would do different at this point is to use the tee on the air lines
Cal R - 08/03/2020

2008 Infiniti QX56

One popped within a week. ETrailer refused to warranty it. Forced me to go thru firestone. That was a 6 week process so i was forced to purchase a second set in the meantime because i had a trip i had to go on with trailer. 6 months later another bag failure. ETrailer customer service unsatisfactory. I advise u Purchase from someone else


Easy to install. But if putting new coil spring on bag will not fit in between coil on the springs. If install on original coil spring rolling bags up and pushing through spring will work. I I stalled new coil spring. So I just slide bag into coil spring before installing. Done both sides of vehicle in about hour and half. No problems. So far doing great. Raised the SUV back up to the original height. Made it ride and drive better.


Quick ship, great help from etrailer staff in selecting product. Install was very easy (about an hour). If installing in cold weather it helps to keep the bags inside until just prior to install to make them easier to compress when inserting into the springs. Ride is much improved with these.

2014 Nissan Armada

Just as described. Took me an hour start to finish. Everything needed is included. Looking forward to using it with the trailer. Great customer service and price match guarantee.

2018 Nissan Armada

Easy to install, works as intended. Very happy

2020 Nissan Armada

Easy enough install. A little bit of a pain working the bag between the coil spring while laying on your back but it it is doable. Would be easier on a lift for sure. I got them in but they seemed twisted so I gave them a little air charge and blead it back off and was able to readjust to a correctly centered position. Looking forward to hooking up the RV to see the difference.


Excellent Product! Installation only took 30 minutes start to finish. Yes that includes jacking up the vehicle and installing the air lines. Very simple and easy. If you use this, get the F3025-1 Union Tee. Will use this product in the future.

2013 Nissan Armada

Easy to install. A bit tough to squeeze though the coil... a bit of elbow grease needed. But otherwise pretty straight forward


worked good fantastic ride in prominent

Show More Reviews

See what our Experts say about this Firestone Vehicle Suspension

  • How to Get the Air Tubing Out of Spring in Firestone Coil-Rite Air Springs F4150
    Where the 3 inch tubing meets the air spring in kit # F4150 there is a collar that holds in the tubing. Push that collar towards the air spring and you will be able to pull out the tubing with your other hand. The little collar holds the tube in by compression. Pushing it in towards the spring releases the tension.
    view full answer...
  • Recommended Air Bags for a 2017 Nissan Armada
    I show the Firestone Coil-Rite Air Helper Springs part # F4150 as a confirmed fit for all models of the 2017 Nissan Armada. Just to be sure, I checked with Firestone and was able to confirm fit on your Armada. Therefore, you will be good to go with the above airbags.
    view full answer...
  • How To Get Proper Ball Height When Setting Up WDH On 2012 Nissan Armada
    It sounds like you are trying to setup a weight distribution system. If that is the case then you'll need to first level the trailer and measure from the ground to the bottom of the trailer coupler. Then, measure from the ground to the top inside edge of the trailer hitch opening on the vehicle. The difference should be the amount of rise/drop you need for the shank and where to position the head. I am certain this is further explained in the owner's manual for the system. If you still...
    view full answer...
  • Weight Distribution Used With Auto-Level Rear Suspension on 2018 Nissan Armada
    The auto-leveling system can make it tricky to set up a weight distribution system, as it can vary the amount of pressure in the system according to the load and suspension movement. If it's possible to shut off the system and then proceed to set up the weight distribution system for towing purposes, that's certainly the way to go. I checked through the owner's manual, and wasn't able to determine if the auto-leveling suspension system could be deactivated. If that isn't possible, I'd...
    view full answer...
  • What PSI Should My AirBags Be At When I Am Not Pulling A Trailer?
    When not towing/pulling anything with your Nissan Armada, the Firestone Coil-Rite Air Helper Springs - Rear Axle # F4150 should be inflated to a minimum of 5psi to prevent the bags from deforming without any air in them. When towing, you want to start inflating the bags according to how much your vehicle is sagging at the rear, and stop inflating when the vehicle is at its normal ride height. Remember to never exceed 35psi with this system. I attached a helpful demonstration video for you.
    view full answer...
  • Suspension Enhancement for 2018 Nissan Armada to Reduce Suspension Sag
    Yes the Firestone Coil Rite kit part # F4150 will do a great job reducing the rear suspension sag of your 2018 Nissan Armada when towing and would work great with your Equalizer system.
    view full answer...
  • Will the Firestone Coil-Rite Air Helper Springs Fit a 2005 Infiniti QX56
    The Firestone Coil-Rite Air Helper Springs # F4150 are confirmed to fit your 2005 Infiniti QX56 and will install inside of the rear coil springs just like on the Nissan Armada. I would recommend replacing your worn springs as well. These are designed to enhance your suspension by increasing stability and helping to keep your vehicle level when hauling a heavy load. I have attached an installation and review video for your reference.
    view full answer...
  • Will Firestone Air Helper Springs Work On A 2018 Nissan Armada With OEM Air Suspension
    The Firestone Coil-Rite Air Helper Springs # F4150 will work with your OEM air suspension on your 2018 Nissan Armada as long as the air bags are not installed in the coil springs. The air bag kit has a load-leveling capacity of at least 500 pounds (at most 1,000 pounds). It has an adjustable air pressure of 5 psi to 35 psi. The air bags are made of a durable , elastic polyurethane. I attached an installation video link below.
    view full answer...
  • Will Timbren Rear Helper Springs Fit a 2014 Nissan Armada SL 2-Wheel Drive
    The picture you have provided looks like the 2014 Nissan Armada 2-wheel drive model that you have does have a bump stop and Timbren does not exclude 2-wheel drive models so you will be able to use Timbren springs # TNRARM. I have linked a help article on Timbren springs for you. You could also use Firestone air bags # F4150 which will fit inside of the rear coil springs.
    view full answer...
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  • Dimension of the Firestone Coil-Rite Air Helper Springs Part # F4150
    I do have a set of rear airbags for you but the Air Lift AirLift 1000 Air Helper Springs for Coil Springs part # AL60817 are not a confirmed fit for your 2017 Nissan Armada. For a set of rear airbags that are confirmed to fit your vehicle I recommending the Firestone Coil-Rite Air Helper Springs part # F4150. I went out to warehouse and measured these airbags for you and they measure 11-1/2" tall x 4-1/3" wide. As long as you have the factory rear coil springs installed on your vehicle...
    view full answer...
  • Recommended Compressor System For Firestone Coil-Rite Air Helper Springs on a 2019 Nissan Armada
    I recommend the Air Lift WirelessONE Compressor System # AL25980 with the Firestone Coil-Rite Air Helper Springs # F4150. This wireless compressor will make installation much easier on your 2019 Nissan Armada as you will not have to run air lines into your cab for a controller or gauge. You can also connect your smartphone with the Air Lift wireless app for over the air updates to the controller as well as using your smartphone as a controller.
    view full answer...
  • What Are The Minimum and Maximum Air Pressures Allowed In The Firestone Coil-Rite Air Springs F4150?
    The Firestone Coil-Rite Air Helper Springs # F4150 for your 2005 Infiniti QX56 require a minimum of 5psi to prevent damage to the bags. The maximum air pressure should not exceed 35psi or you risk damaging the bags. I find having an onboard compressor like the Air Lift WirelessONE Compressor System # AL25980 will help you dial in your ride quality while you drive. This system includes a wireless remote that will allow you to adjust the suspension while you drive or from outside the vehicle...
    view full answer...
  • What Is the Tongue Weight Capacity For a 2012 Nissan Armada and What WDH Should I Use
    I took a look in the owner's manual for your 2012 Nissan Armada and on page 9-22 it states that this vehicle has a 900 lb - 910 lb tongue weight capacity therefore I cannot recommend you go over this. That said you would most likely be okay if the hitch weight you are referring to is wet and not dry but again I cannot recommend this. The amount of tongue weight your trailer has is going to require the use of a weight distribution system per the manual and it will also be good to get some...
    view full answer...
  • Will Firestone Coil-Rite Air Helper Springs Fit with OEM Air Suspension on 2017 Nissan Armada
    The Firestone Coil-Rite Air Helper Springs # F4150 will work with the OEM air suspension on your 2017 Nissan Armada as long as the air bags aren't installed inside the coil springs (see attached photo). I tried looking up where the air suspension bags sit on your Armada but I wasn't able to find the location. Attached is a sample installation video of this kit on a 2011 Armada for you to reference. With that being said, if you are using a weight distribution (WD) system already then you...
    view full answer...
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  • Recommended Suspension Enhancement for a 2019 Nissan Armada
    The only suspension enhancement option for a 2019 Nissan Armada is the Firestone Coil-Rite Air Helper Springs part # F4150. That said, these airbags are only for models without factory auto-leveling suspension. If you have factory auto-leveling suspension then the only thing that will help with tongue weight is a weight distribution system. I recommend the Equal-i-zer Weight Distribution System w/ 4-Point Sway Control part # EQ37100ET. It is possible to rearrange items on the trailer to...
    view full answer...
  • Will The Firestone F4150 Air Bags Fit A 2011 Infiniti QX56
    The Firestone Coil-Rite Air Helper Springs # F4150 is designed to fit inside the rear coil spring of an Infiniti QX56 from 2004 to 2010 as long as they are not equipped with an Auto-Leveling Suspension system. From what I could find out, the 2011 model year of QX56 all came with this style of leveling system. With that being said, the only upgrade we have for your vehicle will be the Stability Plus Stabilizer Helper Springs # SPS97FR that is designed to attach to rear factory leaf springs.
    view full answer...
  • Suspension Enhancement Recommendation for a 2004 Nissan Pathfinder Armada
    For your 2004 Nissan Pathfinder Armada I recommend going with the Firestone Coil-Rite system # F4150. I have included a link to the installation details for you to view. Firestone makes a good quality suspension enhancement system and they also make the air bags for Air Lift. You can install the system as is and use your own air compressor or one at a gas station to fill the bags. Or you can get Level Command II kit, # F2158, which will allow you to add or remove air from the cab of the...
    view full answer...
  • Recommended Solution to Fix Sag on 2018 Nissan Armada SE Towing Trailer with Weight Distribution
    There could be a few things at play here, but since you're already using a weight distribution system I think the first thing I would do is check to verify that my tongue weight is not more than 15% of the GVWR of the trailer; it looks like the 2018 Rockwood Mini Lite 2109s has a GVWR of around 5700-lbs, so you'll want to confirm that it's no more than 850-lbs using a tongue weight scale like the # 5780 (850-lbs is the maximum tongue weight for a 2018 Armada). If you're over weight at the...
    view full answer...
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  • How To Prevent Suspension Sag On 2019 Nissan Armada W/ Auto Leveling Suspension When Towing
    I have another option for you, but the Firestone Coil-Rite # F4150 you were looking at are not compatible with the Auto Leveling shocks on your 2019 Nissan Armada. Using the two together causes issues when the factory shocks try to level your Armada. The only option to prevent sag is going to be using a weight distribution hitch, as there is no other rear suspension enhancement options for your vehicle. What a weight distribution hitch does is distributes the weight of the trailer from...
    view full answer...
  • Recommended Weight Distribution and Suspension Enhancement for 2015 Nissan Armada
    Your 2015 Nissan Armada should have no problem when towing your Keystone Hideout trailer that is 3,800 lbs. It sounds like the squat you are experiencing is due to a weight distribution system that is not rated correctly, not set up correctly with the stacked washers, or that you would benefit from suspension enhancement. For your weight distribution setup, you want to account for the total tongue weight which includes the completely loaded tongue weight of the trailer along with any...
    view full answer...
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