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  1. Vehicle Suspension
  2. Firestone
  3. Air Springs
  4. Rear Axle Suspension Enhancement
  5. Light Duty
THIS ITEM IS NOT A FIT FOR
2001 Toyota Sienna

Firestone Coil-Rite Air Helper Springs - Rear Axle

Retail:$189.42
Our Price: $132.38
You Save: $57.04
Vehicle Suspension
Not Confirmed to Fit

2001 Toyota Sienna

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Shipping Weight: 1.78 lbs
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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 F4105 can be ordered online at etrailer.com or call 1-800-940-8924 for expert service.
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  • Reviews (628)
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Firestone Vehicle Suspension

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

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.



W237604105 Firestone Coil Rite Air Bags - Suspension Kit - Rear Axle

4105

Item # F4105

Installation Details F4105 Installation instructions

This Product Fits The Following Vehicles




Customer Satisfaction Score:


Customer Reviews

Firestone Coil-Rite Air Helper Springs - Rear Axle - F4105

Average Customer Rating:  4.4 out of 5 stars   (628 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.

by:

Excellent product. I have used this brand before on a similar vehicle. Easy install. Prevents sag in the rear end while under load from either luggage or a trailer. Fast shipping. Great price. Thank you very much !!



by:

Super product quality and incredible customer service from etrailer. It is a company you want to keep on your favorites list. I had a bit of difficulty getting the suspension bags to stop leaking, but that was my fault. You have to get the tubing cut squarely or it won't seat properly into the fittings on the airbags and they will leak. Once I learned that lesson, the fix was simple and no problems since. I highly recommend this product.



by:
2011 Nissan Altima

Did not work at all on my 11altima. No change to the suspension and the bags deformed beyond recognition after 2 weeks



by:

It does what it says it does. I was ver shocked to see finally see my car leveled again.



by:

I like the product very much it made both sides of my car even on both sides .and still working fine holds air never had too reinflate I checked air pressure every 3 months all good



by:

Easy install and works well.



by:
1996 Ford Taurus

Great



by:



by:

After installation we are towing on the level and enjoying the ride. In an effort to maintain the minimum air pressure to each Coil-Rite Helper at all times, we installed individual air supplies to each Helper. We used our onboard Horn-Blaster air compressor to supply two air pressure regulators allowing us to easily change air pressure to each individual helper as desired. Each regulator employs a check-valve to maintain pressure to the Helpers in case of a compressor failure. We have marked each pressure gauge to the minimum pressure and another mark for our desired towing pressure.



by:

The Firestone airbags are very well made and has quality feel. It was not very warm in MN when I installed them so I needed to use lubrication and a heat gun to warm the airbags from a distance so the airbags would be pliable. My gladiator has a Decked drawer system and rear steel bumper installed which caused the rear to squat more than the front. After installing these airbags and learning that I was fluent in “FRENCH” the rear of the truck was raised and squatting issues addressed. The drive was improved as well, less body roll around curves.



by:

I have purchased 3 sets of Coil-Right. The product is very good but the installation instructions were terrible. The first set (2023) I installed per video instructions and it failed. The puck that is placed at the top of the bladder fell of and caused a catastrophic failure. The bladder was punctured and was basically destroyed. The second set (2023) I installed per the video but I enlarged the hole in the puck to help is stay on top of the bladder It failed also. The third set (2024) installed per the new installation instructions which removed the bump stop at the top of the tower. So far they seem to be working better but I think eventually the puck will diappere because there is nothing to hold it inside the spring. Time will tell. This is the only product for my vehicle I can use. 2021 Toyota Sienne LE.



by:

As most have indicated fitting the bags in the springs is the hardest part. one tip I found helpful was once the bag was partially in, force the bottom of the bag with the air tube into the center of the spring then slowly let the air go back into the bag. Once it had some air in it i was able to move it around and get into place. once installed at 20 psi it raised my back end two inched. from 35" to 37" It is now level with the front of the vehicle. my vehicle is a 2015 armada platinum. Yes it has the auto leveling system. But the system wasn't functional. I've used these before in a 2010 armada platinum and it worked out great



by:

Great product. I must say that they were a little tough to install. A very tight fit. Fortunately for me I had the availability of a vacuum pump. With that I was able to evacuate all the air out of the bags which made them flatter, with that, it made it easier to slide them between the coil springs. I tow a small camper trailer, I usually run around 20 psi in the bags. This keeps my vehicle level and adds for a smooth ride. A great product.



by:

I can only give this 3 stars because one of the bags only holds air for about 1-2 days. The other bag stays filled for months. When they are both filled it gives my Pathfinder about 1" of extra lift while towing our travel trailer. So, the trip to the campground is fine but then I have to find an air pump for the trip home or tow with it lower. If they would both stay filled I would give them a 5 star rating. I contacted etrailer support and was told that I had to contact Firestone for warranty support. I have emailed (can't find a phone number on their web site) them twice with no reply.



by:

These things are awesome. Install was a bit tricky with actually getting them inside the spring. Defintely don’t attempt during the colder season as the material is NOT pliable. A bit of soapy water helps if the springs uncompressed still aren’t wide enough to easily work them in. They’ve held up great and provide a decent ride when the vehicle is loaded down. Minimal squat!



by:

I'll preface with I am an average do it yourselfer. I tried I stalling them on my VW Atlas for almost 3 hours before I just quit. I had to have them professionally installed. The installers said it took two of their people trying to fit the air rites in each spring. After installation they have been fine. My vehicle drops a little when I hook up boat but not a problematic amount. They hold air for quite a while and have not made any noise while traveling. They work as should. Just be prepared to pay for an install in event you cannot get them in.



by:

The bags seem too short for my 2011 Yukon. The bags increase the spring rate but don't provide any lift to level the truck out. The air hose also keeps coming out of the bottom of the bag, I'm not sure if that is also because they are too short. I've tried to keep the min 5psi in the bags when not towing but the hose just pops out and leaks the air out anyway. My best guess is the wrong part number is listed for my vehicle. Pretty disappointed overall.



by:

They provide support for my Volkswagen Atlas 2022 when towing our travel trailer. Installation wasn't' too challenging other then pushing the bags into the springs. Once I flattened them out and rolled them into a hotdog bun shape with zip ties, went in easy. I also added 90 Degree elbows to avoid kinking the hose if too tight.



by:

Installation was every bit as difficult as other reviews say. I removed the plastic covering the springs, used lubrication, and nearly gave up many times. But in the end, I got them both in place. The only problem I have had have been leaks in the hose caused by my placement. Both times I removed the punctured areas and replaced it with new hose.
As far as function, I have been very happy towing a 1900 lb trailer with my 2012 Toyota RAV4. The air help springs keep the tongue level high enough without sacrificing ride quality.
Overall, I am very happy. I wish they were easier to install!



by:

This system require drilling on even though this item says no drilling is required, the 2021 and newer Toyota Sienna FWD models require drilling. This is direcred in the toyota minivan specific instructions. You have to download the specific instructions for the Sienna that are linked in the description of the item.



by:

Installed on a 2016 4Runner in conjunction with a 1-1/2" Daystar coil spring spacer. Since the coil spacer is hollow, I left one segment of the factory bump stop in place to compensate for and match the height of the spacer. I also added a Firestone T-fitting on the airline for a single inflation point and located the inflation valve next to my trailer plug wiring. Quite a pain to wrestle the coil back in place with the added height of the spacer, but that is no fault of the airbags; pry bar proved critical to wedge the coil back in place since I did not try the bottle jack between the frame and axle trick. After nearly a year, no leaks, bags hold air well. I put 25 psi in them for towing our travel trailer, or keep them at 10 psi for normal running around. I have also found them useful to prevent or at least reduce bottoming out the soft rear suspension that happens when off road driving with even just a couple hundred pounds in the back. Even at 25 psi they ride great and you wouldn't know they are back there at 10 psi. Highly recommend for the low cost and added versatility!



by:

These work great for the VW Atlas!! They reduce the rear end sag when pulling a travel trailer or putting the roof tent on and loading all the gear for some overland trail riding and camping!! They are a must for any adventurous Atlas Owner!



by:

Great upgrade for carrying weight in the back or towing a trailer. They are a bit tough to install. I found twisting the bag over in the middle and inserting it between the spring to the trick. Insert the top side on the passenger bag first. Insert the bottom side first on the driver side take care with the week ass tubing because if it folds over on itself in a coil, it will remain pinched which I can see will cause problems in the future. The tubing was better 20 years ago than what they give you today. One tube replacement over $30!! Ridiculous !! I like the right height adjustability and my truck feels more stable with a load of weight in the back of my truck advertised in the video shown below.



by:

Installed on 2020 VW Atlas Cross sport. Jacking up vehicle to let rear wheels hang separates the spring coils. It is not easy to get the bags inside to coils it takes strength. Also make sure the tubing is connected to the bag and threaded thru the hole in the lower control arm before setting the bottom of the bag in place. A little armor all on the spring helps too and also to remove squeak when driving while deflated.



by:

Install not bad at all!!! Just a pain to do on the ground. Best thing to do with the air bag is to compress it, zip tie so it doesn’t air back up to slide between the springs not much too to work to spin the valve attachment if it opens back up inside the spring.
Definitely helped out with my 2014 Hyundai Santa Fe sport with 175k the springs were worn out now it rides like brand new. As a 6’3” guy now I don’t have to bend down to get under the back door when it’s open like when it was new. Made me think I was getting taller while the car was getting smaller lol.
Worth the investment and time to install!!!!


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Show More Reviews

See what our Experts say about this Firestone Vehicle Suspension

  • Will Coil-Rite Airbags Keep 2000 Buick LeSabre Factory Auto Level System from Running All the Time
    The automatic leveling system on your 2000 Buick LeSabre running frequently when towing a trailer is a common occurrence. Adding suspension enhancement such as # F4105 should help provided the stock suspension is all in good working order. You will want to check the rear coil springs on the vehicle. If there is nothing in the middle of the coil springs then you can use kit # F4105. But if there is a strut or air shock in there you would not be able to use this kit. I do not recommend...
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  • Will Firestone Coil-Rite Air Helper Springs # F4105 Fit on a 2002 Volkswagen Passat GLX Wagon
    As long as you don't have anything inside of your coil springs then the Firestone Coil-Rite Air Helper Springs # F4105 should fit and work just fine. I recommend checking out the linked installation instructions and comparing them to what you currently have on your 2002 Volkswagen Passat GLX Wagon just to be sure.
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  • Will Firestone Coil-Rite Air Springs Stop Sag and Bottoming Out on 2009 Nissan Altima w/20 Inch Rims
    This is a little strange considering that a 215/60-16 tire is about 26.16 inches in diameter and a 245/35-20 is about 26.75 inches in diameter. That is a difference of only 0.59 inches which is in between 9/16 and 5/8 of an inch. Half of that extra height is applied to the upper have of the tire so only about 5/16 inches closer to the wheel well ceiling. I just assumed there was more space in the wheel well. Regardless of the wheel well space using the Firestone Coil-Rite springs # F4105...
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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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  • Is Drilling Required for Installation of Coil-Rite Air Helper Springs on a 2009 Nissan Altima
    The installation instructions for the Coil-Rite Air Helper Springs, # F4105, indicate that the air line should be routed down, see instructions link, so I went out to our parking lot where there is a 2010 Nissan Altima and checked the lower coil spring seat and found that there is a large hole in the bottom of the spring seat that the air line can be routed through. I attached a photo showing my finger sticking up through the hole in the bottom of the coil seat for you.
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    Image 1 for
  • Recommended Air Springs For 2006 Nissan Altima 2WD Sedan
    For your 2006 Nissan Altima we have the Firestone Coil-Rite Air Helper Springs - Rear Axle # F4105. This will help to level your load. These air springs fit inside your existing coil springs to help with handling, braking, and tread wear. They are adjustable from 5 psi to 35 psi with manual inflation valves or you can add a compressor. If you want to add the compressor and gauge so that you can adjust your pressure at any time, I recommend the Firestone Air Command I - Analog Gauge...
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  • Rear Suspension Enhancements for a 2005 Volkswagen Passat TDI
    I called my contact at Firestone and they informed me that the Firestone Coil-Rite Air Helper Springs part # F4105 are not compatible with the TDI versions of the 2005 Volkswagen Passat due to the rear shocks mounting location. For a similar rear suspension enhancement option that is compatible with the TDI version of your vehicle, I recommend using the Coil SumoSprings Custom Helper Springs for Coil Spring Suspension part # CSS-1125R. These SumoSprings are designed to increase ride comfort...
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  • How to Install Firestone Coil-Rite Air Springs Lift on 2008 Nissan Altima
    If you do not have a hole in the lower spring seat you will want to mark the hole to be drilled with a center punch in the center of the lower spring seat. Drill a 3/8" hole in the center of the lower spring seat. I have included a link to the installation instructions which will walk you through the process. Please note that Firestone Coil-Rite springs, # F4105, are designed more to keep the rear end from sagging when under load. If the vehicle is sagging in the back and it is not under...
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  • Rear Suspension Enhancement for a 2006 Nissan Altima
    The Firestone Coil-Rite Air Helper Springs # F4105 that you referenced has been confirmed to fit the rear axle of your 2006 Nissan Altima, but not the front axle. You should also note that systems like this can not be used on vehicles with suspension that isn't in good working order. The best recommendation I can make for you would be to install new springs in the front (and rear if needed) of your vehicle so that it handles properly and be sure not to exceed the towing capacities of your...
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  • Air Bag Dimensions of Firestone Coil Rite Kit # F4105
    The Firestone Coil Rite kit part # F4105 air spring has a 4 inch diameter and a 5 inch length.
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  • Troubleshooting Air Springs Leaking on 2004 Volkswagen Passat
    I'm sure that is incredibly frustrating. It sounds like an extremely slow leak so keeping soapy water around for a few hours is really the only way to determine where the leak is taking place. Most of the time the issue is with the tubing not be cut perfectly straight using a tool like # AL10530. Sometimes scissors or other cutters can change the shape of the tubing just enough to cause a leak. I recommend securing the fittings and then using a cutter on your Firestone Coil-Rite Air...
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  • Rear Suspension Kit Recommendation for 2007 Nissan Altima to Reduce Suspension Sag
    For your 2007 Nissan Altima the Firestone Coil Rite kit aprt # F4105 is a confirmed fit and will do a great job to give additional rear suspension support to reduce the sag you are experiencing.
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  • Will Adding Firestone Air Bag Helper Springs Raise the Suspension On a 2009 Nissan Altima?
    You may see some rise in the rear of your 2009 Nissan Altima when you add the Firestone Coil-Rite Air Helper Springs # F4105. It really depends on if you already have additional weight on the rear end and if your springs are worn. With new springs and no additional weight you are less likely to see any rise in the rear suspension but as the bag pushes into the coils it will allow some of the sag to be relieved and raise the height on worn springs. The Air Command Compressor System # F2610...
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  • Can Firestone Coil-Rite Air Springs Lift the Rear End of a 2007 Nissan Altima
    When inflated you might get a little bit of lift from the Firestone Coil-Rite springs, # F4105, but they are designed more to keep the rear end from sagging when under load. I have included a link to the installation instructions for you. If the vehicle is sagging in the back and it is not under load then you could have a suspension problem and you will want a shop to take a look at it. Suspension enhancement can only be installed on a suspension system that is in good working order.
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  • Will the Firestone Coil-Rite Air Helper Springs # F4105 Prevent Tire Rubbing on 2010 Nissan Altima
    The Firestone Coil-Rite Air Helper Springs # F4105 that you referenced will give you additional support for the rear suspension of your 2010 Nissan Altima. If you inflated them enough it would prevent the suspension from traveling as far as normal over bumps which would stop the rubbing you are experiencing. Too much air pressure will cause the ride quality to be harsh, so your best option would be to experiment with different air pressures till you find one that will prevent the rubbing...
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  • Will Firestone Air Bags F4105 Fit a 2005 Volkswagen Passat 2WD GLS 1.8T Wagon
    According to Volkswagen the rear coil springs are the same on the sedan and wagon models of the 2005 Passat which would indicate that the Firestone air bags # F4105 will fit. Check your rear suspension though and if the strut is inside of the coil springs then the air bags will not fit.
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  • Will Rear Axle Air Bag Kit # F4105 Correct Bottoming Out of 2013 Nissan Altima with 20-Inch Wheels
    The largest stock wheel offered for your 2013 Nissan Altima S is an 18-inch size, so the addition of 20-inch rims has effectively used up most of your normal wheel well clearance. The Firestone rear axle air bag kit you referenced, part # F4105, is a correct fit for your Altima but this will not really address the core problem of reduced clearance. It would stiffen the rear suspension and allow for independent side-to-side leveling but it would not regain any of the clearance lost from...
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  • Can the Air Pressure in the Coil-Rite Air Springs Be Adjusted on a 2006 Nissan Altima 3.5 SE
    Yes, you can adjust the air in the Firestone Coil-Rite Air Helper Springs, # F4105, to decrease the air pressure when you are not towing. These air springs will be the perfect item to assist the rear suspension on your 2006 Nissan Altima when towing and having a fully loaded vehicle. Once the air springs are installed, you can run the air lines to the location of your choice and adjust the air pressure based on the driving situation. I would recommend that you have your rear suspension...
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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
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Alex H
Employee Tyler C
Written by:
Tyler C
Employee Robert G
Expert Research:
Robert G
Employee Michael H
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Employee Jameson C
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Jameson C
Employee John H
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John H
Employee Adam R
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Adam R
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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