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Heavy loads and trailers can make the back end dip and throw off your balance. Firestone Coil-Rite air helper springs fit inside your existing rear coils to provide extra support—up to at least 500 lbs and at most 1,000 lbs of load-leveling capacity. They help keep your vehicle level when you’re hauling or towing, which improves steering control, braking, and even headlight aim. With more even weight distribution, tires wear evenly and the ride feels steady instead of squishy or bottomed out.
No two loads are the same, so these air springs let you dial in the support you need. Each side can be adjusted manually with separate inflation valves to level off-center loads or balance weight from uneven cargo. Add more air for towing or heavy gear, drop to the minimum 5 psi when unloaded for a softer ride. The ability to tune pressure keeps your suspension flexible—comfortable when empty, stable when full.
When you hit dips or bumps fully loaded, you can feel it in the seat and the steering wheel. The Coil-Rite air springs absorb road shock and soften contact between the axle and frame to prevent harsh bottoming out. The polyurethane construction flexes with the road but doesn’t give out under heavy conditions, keeping things smooth and controlled even on rough pavement or uneven ground.
Each Coil-Rite spring is made from elastic polyurethane that holds up under tough use while maintaining its shape and performance over time. The kit includes the air springs, hardware, air line tubing, brackets, and individual inflation valves for manual setup. Compressors, tanks, switches, and gauges can be added separately if you want in-cab control later on. Once installed inside your coil springs, they quietly do their job—supporting weight and keeping your ride balanced trip after trip.
The construction material of the fittings may vary.
Customer Satisfaction Score:
96% were satisfied with this product
4% of customers were not satisfied
Ratings & Reviews
Very good product and very simple to in stall.
Great product had them installed less than two hours after receiving them
Great product at a great price
Worked as advertised
Very satisfied with excellent service and quality products.
They work great
great product. etrailer staff couldn't be better
Easy install, great product, great ride. Great lift when needed
I think you did a good job. Thank you for sending me the merchandise, thank you for Puerto Rico.
I am very satisfied with your products your service and your shipping is fast and reliable
Plan on disconnecting bottom of shock and removing coil spring. Impossible to instal in coil spring while spring is on vehicle. Heat shields take a little time to get right
These bags made a night and day difference when towing our 26 foot travel trailer. I definitely recommend this product to anyone towing a trailer with a heavy tongue weight
Good product with a relative ease of installation with the right tools. Only improvement would be to add a Tee in to the air line so there is only one needle valve for adding air in to the system.
Used on my wifeys 2013 suburban for a loaded cross country trip with a full cargo area and loaded hitch rack, lifted the back end back to normal ride height, and unloaded provided a “cushier” ride.
The directions are set up to cover a wide variety of vehicles. There are pages inserted for adjustments to the instructions for a smaller group of vehicles closely related to mine. I still found them confusing and not very clear. Once I got past trying to do exactly what the instructions (or at least the pictures) were saying, I was able to just look at my setup and install the air springs. The picture for the inserted heat shield instructions was the most confusing because it shows the air hose on the top but for my Avalanche (and I believe most late GM SUVs) the air hose is on the bottom. On the positive side the product appears to be of strong construction for the springs, hose, and the fittings. I'm confident it will greatly improve my Avalanche's ability to tow my trailer safely
I installed these on my 2014 Cadillac Escalade ESV. I pull a 29’ enclosed snowmobile trailer with a 7,000# rating. These help tremendously with sag and sway and make life safer and easier when trailering, particularly when dealing with a crosswind. Installation is a little bit of a knuckle-buster but can be done easily at home.
Very happy with this product. Easy installation. Air bags do not effect day to day driving even at max pressure since they are not as tall as the Spring it is inside, but are very effective once the weight has been added to make for safer handling.
Work great, totally stiffened up my rear suspension. I bought these for a 2007 Tahoe LTZ. Rear was sagging when towing a grey wolf 23dbr trailer. Also combined these with the sumosprings(from etrailer) and a 1 inch lift(purchased elsewhere). Together this was everything I needed to eliminate the sag. Thanks etrailer!!
Having had them on for a year now...Excellent! I was skeptical because of the cheap price as I am used to the higher quality rubber/metal frame units but they have done the light duty job I bought them for.
Installation was challenging in order to squeeze them through the coils but it is do-able. I mounted these inside of a 2000 Tahoe.
I mounted the bags with the air line to the top and ziptied the lines along the wiring conduit. Valves were installed in the rear bumper next to the plate which is perfect because at night time they are illuminated by the plate lights.
I run 20lbs at all times.
One thing I would recommend is buying an airline T and using only one air line for fill/deflate. Two is a pain. I used to have one on my old set up and it was far easier. The T collects both lines behind the bumper.
Enjoy.
Leveled out my Yukon. Good for long hauls. Keep pressure. I check them before every haul and have not had to add air. I deflated them down to 10 psi over the winter since I only use my truck to tow a camper. The ride was similar to the original but with less body roll. They are well worth the money and take little effort to install. I would recommend coupling these with a higher load rated tire as well. I put on some Kumho AT's that were a bit grippy and load range E. It rides like a 3/4 truck when I have everything inflated and like my wife's luxury SUV again when I let some of the air out. Great combination.
I have a 2011 Avalanche and it became evident towing our 24' Trail Runner (6000lbs) that not only would I need the double sway system on the hitch but the Avalanche also needed more stability in the rear end. I purchased 'Firestone Coil-Rite Air Suspension' bags as an inexpensive way of meeting the demands of towing, and true to the advertisements, descriptions, and video, the Avalanche holds the road with little roll or recoil from the diverse conditions we have encountered over a distance so far of 12,000 miles (20,000kms). I run the bags at 20psi (max is 30psi) with and without the trailer. I left the installation of the bags to my mechanic and he was quite impressed with the simplicity and effectiveness of the system. Many thanks!
The air bagsy fit nicely into the coil springs so there are really no modifications needed to install them. The exhaust shields are easily shaped to fit onto the tail pipe where it wraps over the axle.
The only hic- up I had was the installation instructions did not include a diagram of the hose routing for my vehicle, which tells you to mount the bags with air line out the top or out the bottom. I found there was more room out the top and a shorter route for the air lines to be ran.
I added these to my Trailblazer ext after I lowered it 2/4. I pull a 25ft pontoon and a heavy duty equipment trailer that weighs 2500lb empty and I've never rubbed and it keeps the bounce to a minimum. Installation was easy.
The installation video is not accurate for a 2008 Trailblazer. It was much more involved and required removal of the coil springs to do theinstall.
Katrina B.
4/19/2023
We seem to not have a video of the install of this on a trailblazer specifically.
Phone service was excellent. Air bags helped a lot with stability. I found it easier to remove the spring from the Avalanche than to fight with it in chassis. Removing the spring also gave me a chance to clean the dirt and rocks out of the hose routing area. It was a little more work to drop the axle down but it really wasn't that bad. I was able to do it all without a hoist. Just used two floor jacks. I just let one side down at a time. Remove your swaybar link and shock and let one side down. Pull the spring and do the work in a vise. Its much easier than fighting with it on your back. Also put the air hose in really hot water and it will relax its memory.
Lazer S.
1/20/2026
Good idea taking the springs off, Joel! These can definitely be a bit of a pain in the butt with all the stuff impeding an easy install. Being able to clean the area is also nice! What are you towing with your Avalanche? Or did you want these more for regular driving?
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Patrick B.
1/21/2013
Tim, Firestone does not include instructions on howwhere to run the lines as so many people want or need to locate them differently, even on the same vehicle.Some like the fittings mounted through the bumper for easy access, others like them hidden underneath, and others still need to run them forward to a remotely controlled air compressor under the vehicle.