Shipping Weight: 45 pounds
Install these beefy helper leaf springs above your GMC Suburban's rear factory leaf springs. SuperSprings reduce sway and prevent sagging - great for towing or hauling heavy loads. Additional mount kit included for OEM springs that set above the axle.
These additional leaf springs add support and sway control to your existing OEM suspension. Just bolt on SuperSprings over your existing factory springs, and they automatically work when you need them. As the factory spring flexes, a roller at each end of the beefy helper spring reacts to engage the helper spring and to provide extra support. The springs help to better distribute cargo weight throughout your existing suspension, channeling that weight to the points on the frame that are designed to support heavy loads.
Placing these leaf springs above your factory springs helps to keep your OEM springs from twisting, so the SuperSprings act like a sway bar, reducing the body roll that makes driving more difficult and dangerous. With these helper springs, driving is safer and easier when it's windy, when your GMC Suburban is rocked by a passing semitruck and when cornering. The springs help to reduce sway by up to 30 percent. SuperSprings also allow more wheel travel in the rear suspension when they are under load, so they maintain traction and ride comfort better than rubber or polyurethane bumpers. That means they're great for drivers who frequently tow.
You can also customize the level of support provided by SuperSprings. For most models, the shackles that attach the helper leaf springs to your existing leaf springs have several installation options:
SuperSprings are a maintenance-free, low-cost alternative to air spring systems, which require constant monitoring and air pressure adjustment. These helper leaf springs respond automatically to the load you carry, so there is no crawling under your truck to adjust them. You'll also reduce wear and tear on your suspension, brakes and tires, which saves you money. The bolt-on installation means that they are easy to fit - no drilling required.
This suspension stabilizer kit is perfect for trucks towing fifth wheels, campers and gooseneck trailers.
An additional mounting kit is included for installation with factory springs that set above the axle.
For GMC Suburbans with factory leaf springs that set above the axle, this mounting kit ensures that SuperSprings operate silently when the GMC Suburban isn't loaded. When factory springs set below the axle, the axle itself serves as a fulcrum for the helper leaf springs. However, for GMC Suburbans that have OEM springs that set above the axle, the 2-inch brackets in the mounting kit act as fulcrum points on the underside of the SuperSprings. Furthermore, the shackles at the ends of the helper springs hold them in place and pivot as the load is transferred to the SuperSprings. Because there is minimal preload tension in the installed SuperSprings, you get a quieter ride.
Note: The additional mounting kit (MTKT - included) provides U-bolts with a leg length of 4 inches. If your application requires that you use the additional mounting kit and if your existing factory springs have had extra leaves added, longer U-bolts may be required to complete the SuperSprings installation. Also, some older Chevrolet 3/4-ton and 1-ton models (Chevy C/K 2500, Chevy C/K 3500, Chevy Silverado 2500, Chevy 3500, GMC Sierra) have thicker factory springs that may require longer U-bolts.
To determine if you need longer U-bolts, measure the thickness of your existing leaf spring where it sets directly above the axle. If this measurement is greater than 2-3/4 inches, you will need the longer 5-1/4 inch U-bolts (SS112219-4).
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