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Heavy loads can make the rear of your vehicle sag and throw off your balance. These Coil SumoSprings Custom Helper Springs sit between the coils of your rear suspension and add extra support where it’s needed. The microcellular polyurethane foam inside each insert compresses progressively—the more weight you apply, the firmer they become—so your truck stays level and stable without harshness.
When factory coils bottom out, every bump can feel like a jolt. The inner core of microcellular polyurethane foam cushions impacts between each coil to absorb shock and vibration. That means fewer jolts through the seat and better comfort on long drives with heavy loads or trailers.
Unlike air springs, these inserts don’t rely on air pressure or hoses that can leak. Once installed inside the rear coils, they just work—no pressure checks, fittings, or tanks to worry about. You get consistent support and stability without any maintenance or adjustments.
Each helper spring is made to handle tough use and all kinds of weather. The polyurethane material resists abrasion, oil, road salt, and UV damage while withstanding extreme temperatures. That durability means the springs keep doing their job trip after trip without wearing out or breaking down.
Getting these in place is straightforward with basic tools. The wedge-shaped inserts fit between the individual coils of your rear springs—no complicated setup needed. Once installed, they work seamlessly with your existing suspension system that’s already in good working order, giving you dependable support every time you load up.
Customer Satisfaction Score:
96% were satisfied with this product
4% of customers were not satisfied
Ratings & Reviews
Tracy
6/8/2014
Do these work well towing a 2200 lb work trailer hauling a moderate load with a 03 tahoe
Patrick B.
6/10/2014
Brian M.
3/25/2015
Continue to be pleased with the SumoSprings on our 2005 Subaru Outback. The alternative was to spend $800 for new heavy duty rear struts. They work well to prevent bottoming out when towing a camper and dont seem to effect the overall ride quality when not towing a trailer.
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Kate F.
8/20/2026
Glad the install went smoothly, minus having to bow down to the automobile gods =) Hope you treated yourself to a burrito and a cold one afterwards!