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Firestone Coil-Rite Air Helper Springs - Rear Axle
Part Number: F4118
In Stock
$158.89
Retail:$208.83
You Save: $49.94
2017 Land Rover Range Rover
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Firestone Vehicle Suspension - F4118
Highlights
- Custom Fit for Your Vehicle: Mounts to existing attachment points
- 1,000-lb Load Support: Levels your vehicle so steering, braking, and headlight aim stay consistent.
- Customizable Ride Comfort: Adjust 5–35 psi to dial in firmness when hauling or driving unloaded.
- Better Stability Under Load: Keeps your suspension from bottoming out for a smoother, more controlled ride.
- Balances Uneven Cargo: Inflate each side separately to offset off-center loads and reduce body roll.
- Durable Polyurethane Springs: Elastic design resists wear for long-term comfort and load support.
Features to know about
Stay Level and Confident Under Load: Up to 1,000 lbs of Rear Suspension Support
Heavy loads or trailers can make the rear of your vehicle sag and throw off braking and steering. Firestone Coil-Rite Air Helper Springs fit inside your existing coil springs to provide up to 1,000 lbs of load-leveling support. By keeping your ride level, they help maintain even tire contact, correct headlight aim, and improve braking and handling when you’re hauling or towing.
Dial In the Ride You Want: Adjustable 5 psi to 35 psi Air Pressure
Every load is different, and with adjustable air pressure from 5 psi to 35 psi, you can fine-tune your setup for comfort or control. Add more pressure to level heavy or off-center loads, or drop back down when unloaded for a smoother ride. Each side inflates independently with manual valves so you can correct uneven weight and keep body roll in check.
Smooth Out the Rough Stuff: Extra Cushion Between Coil Springs
By adding an air cushion inside your coil springs, these helpers soak up bumps and reduce bottoming out on rough roads. The added cushion improves traction and keeps your suspension working evenly under braking, accelerating, or cornering—even when the load shifts or the pavement gets rough.
Built Tough for the Long Haul: Durable Polyurethane Construction
Made from elastic polyurethane, the Coil-Rite air springs are built for years of steady service under heavy loads and tough road conditions. The kit includes air springs, hardware, air line, brackets, and separate valves for manual inflation so you have everything needed for installation.
Straightforward Setup for DIYers: Simple Install Inside Existing Coils
Installation is designed to be simple—just compress the bag, slip it into place inside the existing coil spring, run your airline tubing to a convenient fill point like the bumper, and secure it with the included hardware. With clear instructions and basic tools, it’s a straightforward upgrade that adds real stability and control to your suspension.
Specs
Weight and Capacity
- Load-leveling capacity: at least 500 lbs (at most 1,000 lbs)
Air Pressure
- Adjustable air pressure: 5 psi to 35 psi
Warranty
- Air springs: Limited lifetime warranty
- Hardware: 2-Year limited warranty
Note
- Construction material: The construction material of the fittings may vary.
W237604118 Firestone Coil Rite Air Bags - Suspension Kit - Rear Axle
4118
This Product Fits The Following Vehicles
- 2000 - 2005 Toyota Echo
- 2003 - 2008 Infiniti FX45
- 1992 - 1997 Jeep Grand Cherokee
- 1993 - 1993 Jeep Grand Wagoneer
- 2003 - 2028 Nissan Murano
- 2013 - 2020 Nissan Pathfinder
- 2004 - 2009 Nissan Quest
- 1998 - 2003 Toyota Sienna
- 2012 - 2015 Chevrolet Volt
Customer Satisfaction Score:
92% were satisfied with this product
8% of customers were not satisfied
- Wrong item was ordered
- Did not arrive in time
Ratings & Reviews
4.4
780 reviews
by:
Nathan
09/21/2020
Very simple design for preventing rear sag when weight is loaded on the tongue. Installation was ok, with the most difficult part being actually getting bags inside the coils. Look to online for help as the instructions are generic and not great. Would recommend getting the t-splitter 1/4 size to get a balanced ride. Only complaintS are the output valve points downward which then Puts your airline closer to the ground than comfortable When driving.
by:
Gordon
10/09/2025
2000
toyota
Sienna
Fit to 2000 Sienna without tubing to eliminate exposure to damage. Carefully filed Schrader shorter so air hose could depress inner core enough for filling with air. Important to refrain from filling bladders until vehicle is loaded as instructions direct. Schrader valves would hang up on the axle mounting holes since they were not centered - required reaming out holes 1/4" off center. Suggest completely deflating when unloaded to prevent squeaking.
by:
Garrett
03/05/2026
1995
Jeep
Grand Cherokee
These are great. Good fit inside the spring. Had to drill the air hole out a little on my strut mount. They are working awesome.
by:
James
06/23/2025
2022
Nissan
Murano
Kit had a faulty connector from air bag to air line, and would not seat and seal properly. Waiting replacement connector from Firestone. The faulty part was not listed in the Parts List on the installation sheet. The Installation sheet is common for four different products 4118, 4172, 4173, and 4197, and does not describe my installation adequately and is somewhat confusing. Rest of kit installed fine though not easily, and appears to work properly. I did have to purchase two 90 degree hose connectors for the air bag end so the hoses would not hang straight down and extend below the car frame and potentially get snagged on something.
by:
Kevin S
05/26/2018
2010
Nissan
Pathfinder
I received my order and installed the Air Helper Springs the next day. I had the opportunity to fully test them yesterday. They were not difficult to install and the instructions were easy to follow. I do wish there had been a video for my particular vehicle since I’m not exactly sure my routing of the air line around the exhaust the best location. Time will tell. After hooking up my trailer I adjusted the air, best I could, since all my tire gauges start at 10 lbs and go up from there. I did get the rear of the Pathfinder as level as I could. A recommendation from etrailer on a good digital or analog gauge would have also been helpful. I did pick up a digital gauge today, works great.
Thanks etrailer for a great products, instructions and your follow up email that answered my questions,
Thanks etrailer for a great products, instructions and your follow up email that answered my questions,
by:
Jason
10/21/2022
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.
Brooke M.
11/1/2022
Thanks for reaching back out about this. I have gone ahead and sent you an email with some more contact information for Firestone.
Jason
10/23/2023
I was never able to get ahold of Firestone to get the one air bag replaced. I just have to fill up the one before heading home from the campground.
Mike L.
11/10/2023
@Jason That bag is covered by their limited lifetime warranty. Contact Firestone at 1-800-888-0650. They are very helpful!
by:
James Steele
03/26/2022
2017
Nissan
Pathfinder
I put these on a 2017 Nissan Pathfinder 4x4. I pulled a 4500 pound single axel camper 30k miles with NO issues. I took it through the osceola national forest (if you know, you know) Never bottomed out and smooth as butter on the ride. I paired the inner coils with a husky weight distribution hitch. The helpers gave me about 1.5 inches off squat when at 20psi. You also do not need to run the air lines unless you just want to. I only needed to add air 1x when seasons changed. Great product.
by:
Matthew
04/17/2018
2014
Nissan
Pathfinder
I installed these on my 2014 Nissan Pathfinder, which despite being rated to tow 5,000lbs, really struggled under the tongue weight of my boat trailer. These airbags really made a difference when towing and only when speeding over speedbumps do I notice them in normal conditions.
My only complaint is that the valve stem points down, which once hooked to the hose, sticks down nearly two inches and was routinely getting ripped off in the snow. I finally gave up the hose and just rolled under the car to increase the pressure (which I've only done once). The kit should really come with a 90* connector, but otherwise it works great.
My only complaint is that the valve stem points down, which once hooked to the hose, sticks down nearly two inches and was routinely getting ripped off in the snow. I finally gave up the hose and just rolled under the car to increase the pressure (which I've only done once). The kit should really come with a 90* connector, but otherwise it works great.
by:
Jean-Hugues
09/02/2021
Hi. As requested bu etrailer, this is my one-year review.
Overall, works very well. Both units are in good shape, still hold air pressure, They have been on constantly for 4 seasons including our Canadian winter, and no issue. I added some grease on it to minimize friction with coil spring.
The only thing that does not work properly is that one of the hoses, which was routed from the spring valve to the supplied inflation port installed on the bumper, does not work, does not inflate spring. I don't know what the issue is, but I have to inflate at the valve directly, which sucks to access.
Thanks
Overall, works very well. Both units are in good shape, still hold air pressure, They have been on constantly for 4 seasons including our Canadian winter, and no issue. I added some grease on it to minimize friction with coil spring.
The only thing that does not work properly is that one of the hoses, which was routed from the spring valve to the supplied inflation port installed on the bumper, does not work, does not inflate spring. I don't know what the issue is, but I have to inflate at the valve directly, which sucks to access.
Thanks
by:
Lisa
04/17/2022
Nissan
Pathfinder
We have a Nissan Pathfinder that is more than capable of handling the tow weight of our boat and trailer, but the suspension is definitely designed for a smooth ride over towing, so hooking up the boat left us with a definite dip in the back. These air helper springs did the trick and were so much easier and less expensive than replacing the suspension!! They made towing the 21 foot boat with trailer much easier and safer.
by:
Shawn
02/12/2024
They keep loosing air have checked hoses quick fittings slowly seep air.
Jenny N.
2/19/2024
It is definitely frustrating to have the springs lose air. You may have done this already, however what I suggest is to take a spray bottle with soapy water and spray the lines along with the fittings to locate the leak. The leaking air will bubble up in that location. If it is the airline then re-cutting the line with a part like # AL10530 can help. If it is the fitting, then reinstalling it may help or might have to be replaced. We typically will carry the replacement fittings. They are covered under the warranty for two years. Please let me know which one you need, if you end up needing one.
by:
James P.
07/22/2011
the rear end higher than it would be (towing with a minivan, 300lb tongue weight), but as they are limited to 35psi, don't lift the rear as much as I would like. They are perfect for a full van by itself. Fairly easy install, only hard part is getting bags into coil spring. Air hose connections work very nicely. Used for 2 months and one 1000 mile towing trip so far.
by:
Jeffy D
11/07/2024
1999
Toyota
Sienna
Great as always, this is my second Firestone Coil-Rite. I had one on my crown vic before and they work great, pretty straight forward install. If you’re lazy like me and didn’t want to remove the shocks then use wd40 to help slip it in between
Brooke M.
11/7/2024
Lazy or effective?...I think the latter! You said you had these on a crown vic. Do you still have the car? Those are my brothers favorite. He had one in Alaska while stationed there and I even went and visited him and still somehow didnt. Ride. In the Crown Victoria. One of my greatest regrets. I may or may not lose sleep over the missed opportunity...
by:
Burke
09/06/2022
2013
Chevrolet
Volt
Worked well, but required drilling a hole to accommodate the stem, despite an indication it was compatible. One bladder then failed after about a year, due to a manufacturing defect. Firestone promptly sent a replacement, but it was a hassle to remove and re-install a new one.
by:
Daniel Herkes
09/16/2016
2013
Nissan
Pathfinder
The product came very soon after I ordered it and is just as what is pictured. While there are no instructions in the kit - I am a capable mechanic and do not need any. It was tough getting the bags into the springs of a 2013 Pathfinder. I relaxed the suspension as best I could, but the spaces in the coils are not large. It helped to insert the bags from the middle of each spring.
The air lines are a combination of schrader valves both conventional and friction fit - take care to trim the friction fit square. I used a sharp knife. I had to fabricate a mount for the exterior valves and used a piece of 1/8 sheet aluminum. I noted the difficulty of routing the air lines away from the hot exhaust and over extension and flexion. On my vehicle the air line must extend from the bottom of the spring and this will, unfortunately increase the risk that the line will foul on a road hazard.
Spend a few moments under your vehicle and route a path for the air lines before starting the install. Overall these bags seem to be a rugged option for a suspension boost. I will add to the review as time goes on if necessary.
The air lines are a combination of schrader valves both conventional and friction fit - take care to trim the friction fit square. I used a sharp knife. I had to fabricate a mount for the exterior valves and used a piece of 1/8 sheet aluminum. I noted the difficulty of routing the air lines away from the hot exhaust and over extension and flexion. On my vehicle the air line must extend from the bottom of the spring and this will, unfortunately increase the risk that the line will foul on a road hazard.
Spend a few moments under your vehicle and route a path for the air lines before starting the install. Overall these bags seem to be a rugged option for a suspension boost. I will add to the review as time goes on if necessary.
by:
Papio-Paul
09/12/2020
Pleased with this product, and the customer service/follow-up I received. The kit was exactly as promised, a good fit for my vehicle. Installation of these is tricky but definitely doable. I was a bit frustrated with the delay of back-ordering, but recognize all shipping has been disrupted by the pandemic.
by:
Gavin R.
02/14/2017
2016
Nissan
Pathfinder
I got the a draw tite hitch, wiring harness and Firestone coil helpers for my 2016 Nissan pathfinder. Everything fit great and was easy to install. The price was awesome and shipping was super fast. An easy A+ for etrailer.com.
by:
Robert
11/01/2023
Exactly what I needed, work great, Thank You etrailer.com!
Robert
11/1/2024
A must have option if you tow. At the 35 psi max pressure, car stays perfectly level with a fully loaded trailer. Best investment if you need extra support without sacrificing a comfortable ride.
by:
James
08/22/2022
Bought this for our Toyota Sienna, it helped a bit but one side leaks and has to be aired up anytime we have a full load.
David B.
9/15/2022
I would check your air lines. Make sure that your connection points are flat and level with no abrasions. Get a spray bottle with soapy water and hose the sucker down and see where the bubbles are coming from.
by:
Tim
06/11/2020
Easy to install and improved the ride and enabled me to have a more level ride in my Pathfinder when towing a trailer
by:
Jeffrey S
10/10/2019
2016
Nissan
Pathfinder
I've installed the air springs and and they hold up great. I'm pulling a tall 5 x 10 enclosed trailer and no more sagging in the rear end. Air up the bags to 35 max PSI and the ride quality is excellent.
by:
Eric
07/09/2020
Nissan
Pathfinder
Great support for suspension while pulling my boat with our pathfinder. Easy instal thanks to etrailers videos.
by:
Donovan
03/13/2022
Excellent communication form order placement through delivery. The installation instructions are super clear as well. I’ll order again from etrailer!
by:
Cindy
12/17/2014
We ordered a suspension kit it came right away and at a great price. We had checked out several shops in town who said they were hard to get for our new vehicle and the cost was out of this world. Great job guys
by:
James
02/08/2024
etrailer has no business being in business. The customer is your business. And I for one, won't be doing business with your company anymore. Not a happy customer.
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- Determining If 2014 Nissan Pathfinder Can Use Weight Distribution Hitch.I would be happy to help! Nissan's response was what we call clear as mud. I have no idea where they are getting that you only need a weight distribution hitch if a load is 8000lbs or more, as that is not any sort of industry standard weight. I recommend checking the trailer hitch receiver of your 2014 Nissan Pathfinder for the load rating sticker, and seeing if it mentions a weight rating for weight distribution hitches. Since they do not mention that you vehicle/hitch can handle the...
view full answer... - Suggested Suspension Enhancement for a 2013 Nissan PathfinderWe have a few options to supplement the suspension on your 2013 Nissan Pathfinder. The first will be the SumoSprings # CSS-1195R. This is an easy to install, set it and forget it part. That being said, it will stay installed and will affect the ride when not towing, but will definitely help when you are. The other option we have is the Firstone Coil-Rite Air Helper Springs # F4118. This is the option I would go with. This has to do with the adjustability of them. They can be adjusted from...
view full answer... - Can Air Lift AL21838 Union Tee Air Line Fitting Be Used With Firestone Air Helper SpringsBoth the Firestone # F3025-1 and the Air Lift # AL21838 are intended for use with 1/4 inch diameter air tubing, so either union tee is interchangeable. Either one would work just fine with your # F4118 Firestone Coil-Rite air helper springs. The union tee will allow you to fill both airbags simultaneously using one Schrader valve.
view full answer... - Recommended Air Bags for a 2019 Nissan PathfinderIt sounds like you might be looking for a set of air bags for a 2019 Nissan Pathfinder and if that's the case we do have one option from Firestone, the Firestone Coil-Rite Air Helper Springs part # F4118 which is a confirmed fit. There are no options from Air Lift at this time.
view full answer... - Availability Of Instructions For Firestone Coil-Ride Helper Springs F4118We have not had a chance to install the Firestone Coil-Rite Air Helper Springs # F4118 you were looking at in a 2020 Nissan Pathfinder so there is not a video of the install available. I did however include a link to the written instructions that go over how to get the kit installed. Basically you will need to feed the springs into the coil springs on your Pathfinder with the valve pointing down, and then run the air lines to the rear of your vehicle and install the two valves to fill...
view full answer... - Will Firestone Coil-Rite Air Helper Springs F4118 Provide Lift For 2020 Nissan Pathfinder The Firestone Coil-Rite Air Helper Spring Kit # F4118 you mentioned for your 2020 Nissan Pathfinder will not lift your vehicle, but will just provide between 500-1000lbs of load leveling support to fight suspension sag when towing a trailer. You can fine tune the amount of support by adjusting the helper springs between 5-35 PSI to get the exact support you need. The # F4118 includes everything needed for the install, but if you would rather not have to manually inflate each bag when...
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Kevin S.
5/26/2019
Excellent! I use it when I tow my equipment trailer and I haven’t had “any” problems. I did alter the hose configuration to a single point of air input instead of a valve for each bag. I know their reasoning but single input works better for me.