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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
Katrina B.
4/19/2023
We seem to not have a video of the install of this on a trailblazer specifically.
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.
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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?