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Heavy gear or a loaded trailer can make your suspension sag and your steering feel off. Coil SumoSprings Custom Helper Springs slide right between the coils of your existing suspension to help support that extra weight. Each spring’s microcellular polyurethane foam core automatically stiffens as the load increases, reducing body roll and keeping your truck level when it’s working hard.
When your factory coils are fully compressed, every bump can hit hard. These helper springs add cushioning between each coil to soften those impacts and keep the ride comfortable. The foam design absorbs shock and vibration so you’re not feeling every dip in the road, even when your rear axle is under load.
Unlike air systems that need constant pressure checks or hoses to route, these polyurethane springs require no air tanks, valves, or upkeep. Once installed, they quietly do their job with zero maintenance—just consistent support every time you haul or tow.
Coil SumoSprings stand up to harsh weather and heavy use. The material resists abrasion, oil, road salt, and UV damage while staying flexible in extreme temperatures. That means long-lasting suspension help without wear or leaks, no matter where the miles take you.
Customer Satisfaction Score:
91% were satisfied with this product
9% of customers were not satisfied
Ratings & Reviews
Phil R.
4/30/2022
We installed the sumo springs on our 2016 Travado and they are all we were looking for, stability, leveling, and smooth ride, I have since put them on my 2014 GMC pick up and recommended them to our circle of construction workers and friends.
Evan
11/15/2022
Still doing fine after 1-year and 10,000 miles. They help smooth out a choppy ride I experienced at highway speeds when I had just the rear springs installed. Definitely install front and back!
Bruno F.
1/28/2020
So far so good it eliminates sag while towing or having heavier objects in the vehicle.
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Lazer S.
3/24/2026
Sorry to hear about the install difficulties, Robert. I do have to say that this kind of suspension supplementation will never lift the vehicle they are installed on though. They will really only "tighten" up the compression of the coil springs to offer more support. Have you tried towing anything with your Promaster yet to see if there is any difference? They do have a 30-Day satisfaction guarantee in case they don't perform to your liking.