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  1. Vehicle Suspension
  2. Firestone
  3. Air Springs
  4. Towing/Load Leveling
  5. Light Duty
  6. Rear Axle Suspension Enhancement
THIS ITEM IS NOT A FIT FOR
2023 Subaru Crosstrek
Firestone

Firestone Coil-Rite Air Helper Springs - Rear Axle

Part Number: F4185
In Stock
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$188.53
Retail:$247.79
You Save: $59.26
Vehicle Suspension
Not Confirmed to Fit

2023 Subaru Crosstrek

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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 F4185 can be ordered online at etrailer.com or call 1-800-940-8924 for expert service.
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Firestone Vehicle Suspension - F4185

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

  • Provides extra support for your existing rear coil springs
    • Springs fit inside existing coil spring suspension on your vehicle
  • Keeps your vehicle level when you are hauling heavy loads
    • Improves steering and balance
    • Levels headlight beams
    • Reduces tire wear
  • Maintains even load distribution with air pressure, leveling off-center loads
    • Air bags adjust manually, side to side, with individual inflation valves
  • Allows for more effective braking and handling
    • Works under heavy loading and adverse road conditions
  • Increases stability to create a smoother ride and prevent bottoming out
  • Constructed of durable, elastic polyurethane
  • Includes all materials necessary for no-drill 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 quicker and easier air spring inflation or deflation from inside your vehicle
  • Made in the USA


Specs:

  • Load-leveling capacity: at least 500 lbs (at most 2,000 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 - 70 psi
  • Warranty:
    • Limited lifetime for air springs
    • 2-Year limited for hardware


Note: The construction material of the fittings may vary.


Firestone Coil-Rite Air Spring Basics

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 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.


Adjustable Air Pressure

Firestone Coil-Rite airline installation

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.


Air Spring Construction

Firestone Coil-Rite air spring components

Coil-Rite springs are constructed of durable, elastic polyurethane to ensure years of service.


Air Spring Installation

The Coil-Rite springs install inside your existing coil springs. The custom-fit springs attach to your vehicle's spring seats - no drilling required.



W237604185 Firestone Coil Rite Air Bags - Suspension Kit - Rear Kit

4185

Replaces Firestone 4190

Installation Details F4185 Installation instructions

This Product Fits The Following Vehicles



California residents: click here


Customer Satisfaction Score:

Ratings & Reviews

4.4

709 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

  • Towing a Fifth Wheel Trailer With 5-1/2 Foot Bed and Rambox
    You will be able to tow a fifth wheel with your 2014 Ram 1500 LongHorn that has a Rambox but it will require the use of a fifth wheel trailer with a Sidewinder king pin. If the fifth wheel trailer you purchased does not already have a Sidewinder you will need to purchase one to replace what is on the fifth wheel. Sidewinders are designed to replace specific king pins; for example # RP34FR is designed to replace Fabex 663 and 665, Lippert 0719, 1621 and 1621HD, as well as M&M 663 and 665...
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  • Recommended Air Bags for a 2015 Ram 1500 with In-Bed Hitch
    The only true air bag option for a 2015 Ram 1500 with in-bed hitch is the Firestone Coil-to-Air-Spring Conversion Kit part # F2595 which replaces the coil springs. If you don't want to do that then you can install an in-spring air bag like the Firestone Coil-Rite Air Helper Springs part # F4185. Unfortunately, all other air bag options for this vehicle won't work with this vehicle due to the brackets interfering with one another.
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  • Differences Between the AirLift and Firestone Coil Spring Helper Airbags for a 2017 Ram 1500
    Both the Firestone Coil-Rite Air Helper Springs part # F4185 and the Air Lift AirLift 1000 Air Helper Springs part # AL60818 are good options for your 2017 Ram 1500. The only real difference between the two is their pressure rating. As you previously mentioned, the Firestone airbags are rated up to 70 psi whereas the AirLift airbags are only rated up to 35 psi. Although the Firestone airbags are rated up to a higher psi than the AirLift airbags, they both have a maximum load leveling capacity...
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  • Will The Firestone Coil-to-Air-Spring Conversion Kit Fit On a Lifted 2016 Ram 1500 4x4?
    The Firestone Coil-to-Air-Spring Conversion Kit # F2595 will only fit at stock height on your 2016 Ram 1500 4x4. They do not offer lift spacers which are compatible with these air springs. If you do find a 6" lift kit which maintains the factory coil springs you can use the Firestone Coil-Rite Air Helper Springs # F4185. As many lifts will send new coil springs I may be able to help you find a set of Air Helper Springs which will fit into the new coils but I will need to verify the diameter...
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  • Rear Suspension Enhancement Recommendation for 2018 Ram 1500
    For the coil spring rear suspension of your 2018 Ram 1500 we have the Firestone Coil-Rite kit part # F4185 as a confirmed fit and a great solution. The bags of this kit fit into the coils which allows you the ability to have as much suspension support as you want by adjusting the pressure in the bags. For a compressor kit to allow you the ability to monitor and inflate/deflate the bag pressure from the inside of your truck you'd then want the Firestone Air Command part # F2158 if you...
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  • Comparing Air Bag Kits for Suspension Enhancement for 2016 Ram 1500
    Air Lift and Firestone air bag kits are both very solid choices for air bag kits but the Firestone kit part # F4185 has the advantage as Firestone is considered to be the higher quality air bag so it would be the best choice. This is the correct kit for your 2016 Ram 1500.
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  • Firestone Air Bag Kit For 2016 Ram 1500 4x4
    For your 2016 Ram 1500 4x4 we have the Firestone air bag kit part # F4185 which is a confirmed fit. Or if you wanted to convert your coil springs to air springs you'd want the part # F2595.
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  • Comparing Firestone and Air Lift Air Helper Springs for Coil Springs on 2018 Ram 1500
    The biggest difference between the Firestone Coil-Rite Air Helper Springs # F4185 and Air Lift 1000HD Air Helper Springs for Coil Springs # AL60818HD is the capacity of the Air Lift. The Air Lift helper springs have a 2,100 lb load-leveling capacity compared to the 1,000 lb capacity of the Firestone springs which gives you more leeway when towing. The higher capacity of the Air Lift, along with the lifetime warranty they come with, are why I recommend them over the option from Firestone...
    view full answer...
    Image 1 for
  • Leveling a 2019 Ram 1500 Classic When Towing a Dump Trailer
    With the Big Tex trailer having an I-Beam frame and the storage box I'm going to recommend using the Firestone Coil-Rite Air Helper Springs # F4185. By using the air bags on your 2019 Ram 1500 you will be able to adjust the ride height to work with the different loads that you will have with your dump trailer. This is something that is not as easily done with a weight distribution hitch. The Air Command Compressor System # F2610 is a great on board compressor system to accompany the air...
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  • B and W Gooseneck Hitch and Air Bag Kit Recommendation for 2014 Ram 1500
    The B and W Gooseneck Turnoverball Gooseneck hitch part # BWGNRK1309 that you referenced is a confirmed fit for your 2014 Ram 1500 regardless of if you have an air bag kit installed so either way you are okay to start with just the hitch. I attached an install video link for this kit for you to check out as well. When you are ready then the Firestone Coil Rite kit part # F4185 is the correct air bag kit for your truck. It installs in the coils of the rear suspension so frame brackets...
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  • Camper Tie Down and Air Bag Kit for 2018 Ram 1500
    For an easy clamp-on camper tie down solution the Brophy kit part # HSBP is a fit and does not require any drilling. You will need the hardware kit part # TDHP as well but then you'd be set. Then for air bags you'd want the Firestone kit part # F4185. This is the highest quality kit we have for your truck.
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  • Ram 1500 Classic Air Bags to Help When Towing a Trailer or Boat
    The Firestone Coil-Rite Air Helper Springs # F4185 you were looking at fit your 2020 Ram 1500 Classic and would be a good option to help with your truck sagging when towing. The Firestone Coil-Rite Air Helper Springs # F4185 are made in the USA and fit inside the existing coil spring suspension on your truck. They will increases stability to create a smoother ride and prevent bottoming out. I also recommend adding the Firestone Air Command I - Analog Gauge w/ Light-Duty Compressor # F2158...
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  • Firestone Air Bag Kit for 2015 Ram 1500
    I can certainly recommend a great air bag kit for your 2015 Ram 1500, however you won't be able to use the Firestone Ride-Rite Air Helper Springs # F2299 from your older model Ram with the factory coil springs on your new truck. The coil suspension on the 2015 Ram requires a completely different design for proper operation so these bags unfortunately won't be compatible and there isn't a way to convert them for use. My best recommendation is to try to sell your existing system and hopefully...
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  • Recommendation For Improving Ride Quality and Safety On 2020 Ram 1500 Classic Towing 30' Coleman TT
    Yes, using the Firestone Coil-Rite Air Helper Springs # F4185 will help to improve towing your 30' Coleman Lantern LT travel trailer. The air springs will provide additional support to your rear coil springs to reduce the amount of sag you encounter. A weight distribution hitch like the Equal-i-zer # EQ37100ET is going to be a much better option. This will also help to reduce rear end sag by transferring the weight more evenly across your Ram rather than all the weight being on the rear...
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  • Comparing Timbren and Firestone Suspension Enhancement for 2018 Ram 1500
    Timbren and Firestone make excellent products for supporting the rear suspension of your 2018 Ram 1500. The benefits to the Timbren springs are that they require zero maintenance and no adjustments after they are installed. With everything you have to worry about for each camping trip, it may be nice if you have one less thing to worry about. The downside to the Timbren springs is that they could be noticeable with an empty bed when you hit large bumps. The springs are designed to handle...
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  • Will Firestone Air Bags Work with Timbrens on a 2014 Ram 1500
    If you're referring to the Firestone Coil-Rite Air Helper Springs part # F4185 then yes, you can use these with the Timbren Rear Suspension Enhancement System part # TDR1500DQ. If you're referring to the Firestone Coil-to-Air-Spring Conversion Kit part # F2595 then the gap would be too tight between the spring and bag therefore I do not recommend this.
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  • Recommendation to Reduce Sag on 2011 Ram 1500 Towing Gooseneck Trailer
    To greatly reduce rear sag on your 2011 Ram 1500 when towing I highly recommend the Firestone Coil-Rite Air Helper Springs # F4185. These durable air springs feature a load-leveling capacity of up to 1,000 pounds and their adjustability (5 psi to 70 psi) will allow you to create a level (and comfortable) ride not only when pulling the horse trailer 10-15 times but also during the rest of the year when you're either riding empty or hauling cargo in the truck bed. The springs themselves...
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  • Suspension Enhancement for 2014 Ram 1500 to Help With 5th Wheel Towing
    That is a good question but there is nothing that can be done to your 2014 Ram 1500 which is going to increase it's capacity in any way. Suspension enhancement is definitely a good idea, but it will only help counteract the weight at the rear of your truck when towing instead of allowing you to pull more weight. For your 2014 Ram 1500 I recommend the Firestone Coil-Rite Air Helper Springs # F4185 which are technically air bags but also sit in the coil springs so you get an improved ride...
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  • Will Rear Air Suspension Add Weight Capacity to a 2014 Ram 1500 for Rear Sag When Towing
    We do have air springs, like the Firestone Coil-Rite Air Helper Springs # F4185, which fit your 2014 Ram 1500, but what it sounds like you need is a weight distribution (WD) system. An air bag kit will help support your suspension but it will not increase your weight capacity. A WD system works by distributing the tongue weight (TW) of your trailer evenly among the axles of your Ram and your trailer for a level ride. We also recommend using one of these if the trailer weighs at least half...
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  • Replacement Mounting Parts Needed for Firestone Air Bags on a 2014 Ram 1500
    Hey Stephane, thanks for reaching out! I can check on the replacement mounts, but I wanted to reach out first and see if you're installing the Firestone Coil-Rite Air Helper Springs # F4185 or the Firestone Coil-to-Air-Spring Conversion Kit # F2595 on your 2014 Ram 1500? These install differently on your truck and we don't always have the replacement parts readily available so if you can let me know which one you're installing I can look for those parts for you.
    view full answer...
  • Air Helper Springs and Compressor For 2017 Ram 1500 Laramie
    I recommend the Firestone Coil-Rite Air Helper Springs part # F4185 for the 2017 Ram 1500 Laramie without factory air ride. The Firestone bags are considered to be a higher quality construction compared to the other brands. The bags install inside the coil springs of the rear suspension to help level out the truck. For an air compressor, Air Lift # AL25980EZ is the best due to its supreme ease of use.
    view full answer...
  • Timbren Front Suspension Enhancement System for Full Bumper Replacement on a 2019 Ram 1500 Classic
    I have a solution for you but no the Firestone Coil-Rite Air Helper Springs item # F4185 is for the rear coil springs of your 2019 Ram 1500 Classic and would not fit in the front. I recommend the Timbren Front Suspension Enhancement System item # TDF15004B. These have a 4,000 lbs capacity and are popular for use with snow plows. They will help to stabilize and level your Ram 1500 Classic with your aftermarket full bumper replacement. The helper springs act as shock absorbers and take the...
    view full answer...
  • Can the Firestone Coil-Rite Air Helper Springs Hold Up During the Winter in South Dakota
    The Firestone Coil-Rite Air Helper Springs, like part # F4185 that you purchased, have actually been tested and approved to work in temperatures as low as -40 degrees Fahrenheit so you shouldn't have any problems with condensation causing the bags to malfunction.
    view full answer...
  • Air Bags For a 2018 Ram 1500 Without Factory Air Ride To Level Suspension When Towing a Boat
    Since your boat is light at only 3,500-4,000lbs trailer weight which will likely be between 400-600lbs of tongue weight you will not need a system with 3,000lbs of capacity. The Firestone Coil-Rite Air Helper Springs # F4185 are much easier to install and will provide between 500-2,000lbs of load leveling capacity. This will be enough to level your Ram if that is the largest amount of weight you will be hauling. For these air bags I recommend the Air Lift WirelessAIR Compressor System...
    view full answer...


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Info for this part was:

Employee Leah B
Updated by:
Leah B
Employee Mary K
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Mary K
Employee Wilson B
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Wilson B
Employee Daron K
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Daron K
Employee Anna W
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Anna W
Employee Alex H
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Alex H
Employee Noah M
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Noah M
Employee Tyler C
Written by:
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Employee Jeff D
Installed by:
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Employee Robert C
Installed by:
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Employee Jameson C
Expert Research:
Jameson C
Employee Joshua S
Video Edited:
Joshua S
Employee Jacob T
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Jacob T
Employee Chris R
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