These polyurethane springs are in constant contact with your GMC Sierra's suspension to reduce sway, prevent sagging and support your existing springs while maintaining a smooth ride. Cold weather design performs well in below-freezing temperatures.
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SumoSprings work constantly to enhance your GMC Sierra's suspension. Each bellows-shaped bumper is bolted to two mounting brackets: one attached to the frame and the other to the axle, typically above your existing factory leaf spring. Because each spring is in full contact at the top and bottom of the suspension's travel, the expanding and contracting action of the SumoSprings enhances your ride under all conditions, not just when your GMC Sierra is loaded. Like a shock absorber, the closed-cell urethane foam helps to dampen road vibration for a less jerky ride.
If you are a hardy soul who lives in the northern USA or Canada, these springs will keep your suspension flexible even when it's below freezing. Cold weather SumoSprings are specifically designed to perform well in extremely cold temperatures ranging from 14 F to -25 F (-10 C to -32 C). A steel coil inside each polyurethane spring helps the spring rebound and keeps your ride comfortable. These SumoSprings work equally well in warm weather. The cold-weather design doesn't affect their performance in warmer temperatures.
SumoSprings can compress by as much as 70 percent to support a heavy load. This keeps your truck level, helps to prevent sagging and reduces bottoming out. Hauling heavy cargo or pulling a trailer can cause the rear of your GMC Sierra to sag while the front end rises. This means that the rear axle is handling the full weight of the load plus your truck's weight as well. The lighter weight on the front axle means that the front tires make less contact with the road, causing problems with traction, steering and braking. With SumoSprings helping to more evenly distribute the weight of your load, your tires make better contact with the road and your driving control greatly improves. SumoSprings act progressively - the more you load them, the stiffer they become. Each spring operates independently to support the weight of your cargo. That means the springs automatically adjust to support whatever amount of weight is loaded onto them - even if the weight on one side of your GMC Sierra is greater than the weight on the other. That makes these springs great for off-center loads because they reduce body roll and improve your cornering ability.
These springs also extend in height by as much as 30 percent to allow more movement in your suspension when you're traveling unloaded, making your ride smoother and more comfortable.
SumoSprings expand and compress vertically with minimal expansion to the sides, so they aren't damaged by nearby mechanical parts and they fit safely into tighter spots. The kit is designed to install easily, and the custom-fit brackets bolt onto your GMC Sierra with no drilling necessary. SumoSprings eliminate the maintenance and higher cost associated with air spring systems. The springs also extend the life of your existing suspension, including any aftermarket shocks. And these polyurethane springs are tough. They resist abrasion, oil, road salt and UV rays that can more quickly wear out other springs.
These springs are perfect for those who tow on weekends but who also use their trucks without towing or hauling during the week.
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