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When extra weight pushes your rear suspension down, these Coil SumoSprings step in to keep things level. The wedge-shaped inserts fit between the coils to add support right where you need it. Their microcellular polyurethane foam core adjusts progressively—the more you load on, the stiffer they get—so your suspension stays steady even under heavy loads. That means less squat, better steering control, and a smoother ride when towing or hauling gear.
Factory coils can bottom out when pushed hard, but these helper spring inserts absorb shock before it reaches you. Each spring cushions the space between coil loops to take the edge off bumps and jolts. The result is a more comfortable ride, especially over rough highways or during long drives with a loaded rear end.
Unlike air-based systems that need pressure checks and fittings, these polyurethane springs require no air or upkeep once installed. You just insert them between your coils and hit the road—no valves, hoses, or tanks to worry about. They’re built to handle oil, road salt, UV rays, and extreme temperatures without damage or leaks, giving you long-term stability with zero maintenance.
These inserts are custom fit for rear coil spring suspensions that are in good working order and install easily using basic tools. Once in place, they enhance your suspension’s ability to support weight without changing your vehicle’s weight-carrying capacity. It’s a straightforward way to firm up your ride and keep your truck level under load.
Ratings & Reviews
Michael
4/8/2026
Still working like new!
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!
Michael T.
8/15/2015
There still seems to be less squat with my camping trailer attached. It is leveled out a bit.
Thomas
9/20/2021
Excellent product. Holding up great. When towing my camper, the squat is less the 1. Much better then before when 3 was the norm.
Brooke M.
3/19/2025
Awesome! Sounds like they are performing exactly how they are designed to - love to see it! When's the next trip with the boat?
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
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Brooke M.
4/8/2025
Wow, I can totally see the difference! I am so happy to hear these took care of business. Thanks for sharing your install hacks, too!