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When the bed is packed or the trailer is on the hitch, rear-end sag can throw off your ride height and steering feel. The SuperSprings Custom Suspension Stabilizer and Sway Control Kit adds up to 3,000 lbs of rear suspension support, reducing sag and keeping your truck level under heavy loads. These helper springs mount above the factory leaf springs, taking strain off your stock setup and helping maintain proper stance and braking balance when towing or hauling.
Strong crosswinds, curves, and uneven loads can make a truck sway or roll more than you’d like. This kit works like a sway bar by reinforcing your factory springs to reduce body roll by up to 30 percent. The SuperSprings engage through rollers that activate under load, adding stiffness only when you need it. That means a more stable feel when cornering, passing big rigs, or driving in gusty conditions—without sacrificing unloaded ride comfort.
There’s no air pressure to monitor or tubing to leak. The SuperSprings system adjusts automatically to your payload—just bolt it on and go. As load increases, the spring tension rises to balance out weight distribution; when unloaded, the rollers deactivate for normal ride quality. It’s a no-drama way to keep your suspension working right without extra upkeep or adjustments.
Every truck carries weight a little differently. That’s why this kit gives you multiple shackle mounting options to tune support and height. Use the upper bolt holes for maximum lift and stiffness when carrying constant heavy loads or dealing with older springs, or use the lower bolt holes to maintain a near-factory ride when empty. A mixed setup using one upper and one lower hole offers a balanced middle ground between support and comfort.
The kit includes extended-length U-bolts for spring packs over 2-3/4" tall and a mounting kit designed for factory springs that sit above the axle. The hardware keeps everything secure while allowing the shackles to pivot smoothly as weight transfers to the helper springs. With its bolt-on design and no drilling required, you get strong rear suspension reinforcement that installs cleanly and works quietly under load—ready for towing, hauling, or everyday work use.
Alternate Instructions
Customer Satisfaction Score:
99% were satisfied with this product
1% of customers were not satisfied
Ratings & Reviews
Larry P.
10/3/2022
They work great, they improved the rear suspension so there is no more bottoming out when I pull the 5 wheel Rv .
Mike L.
10/1/2026
UPS is currently doing an investigation, once they figure out what's going on we'll get you an update. I'm very sorry for the delay.
Howard
11/9/2020
One Year later still no sag.
Mike L.
2/8/2019
If you look at page 4 of the instructions which Ive linked for you, you can see photos showing a single leaf spring set up just like whats shown in the photos you provided thanks for the photos!. Im guessing that page was not included in your instructions for some reason.
Helpful Links
Timothy
2/9/2020
Springs are working wonderful after I figured out the install,. The initial problem was all my fault for being a man and not really reading the instructions haha. All is well
Do you have a question about this Vehicle Suspension?
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Victoria H.
11/11/2024
Hi Chris, there should've been a hardware kit for suspensions with leaf springs that sit above the axle. Please let me know if this is the hardware kit that was missing, and I can help you get this resolved.