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When heavy trailers or bed loads start weighing down the back end, these helper leaf springs add up to 2,300 lbs of support right where it’s needed. The SuperSprings Custom Suspension Stabilizer and Sway Control Kit mounts above your factory leaf springs to lift the rear when loaded and keep your truck level. That means safer braking, steadier steering, and no more rear-end sag or bottoming out when towing or hauling.
Crosswinds, passing semis, or tight corners can make a loaded vehicle feel unstable. These helper springs work like a sway bar to keep the factory springs from twisting, cutting body roll and sway by up to 30 percent. Each spring has a roller on both ends that automatically engages under load and backs off when unloaded, so stability improves only when it’s needed without stiffening the ride the rest of the time.
Not every load or driving style is the same, so the included shackles let you choose how much support you want. Use the upper bolt holes for more lift and constant heavy loads, the lower holes to keep factory ride height when unloaded, or one upper and one lower for a balanced setup. It’s an easy way to fine-tune support and comfort without air lines or compressors.
This kit bolts directly above your existing leaf springs with no drilling required. For setups with top-mounted overload springs, dense polyurethane pads are included to prevent shifting. There’s no air pressure to monitor or tubing to maintain—just a straightforward system that works automatically as your load changes. With fewer parts to worry about, you get a solid suspension upgrade that lasts and helps extend the life of your brakes, tires, and factory springs.
This kit is designed to fit a vehicle with factory top overload springs. As shown in the picture above, a top overload spring sits above the factory leaf spring pack.
Customer Satisfaction Score:
80% were satisfied with this product
20% of customers were not satisfied
Ratings & Reviews
John
9/3/2026
The product works great after a year. I highly recommend the super springs for any heavy loads. After they are installed you never need to worry about the load.
Jerry B.
9/3/2026
Gwendolyn Y.
4/23/2026
Thanks for your feedback, Bob! We’re glad to hear the shackles made a noticeable improvement in your ride quality. We appreciate you pointing out the fitment challenge and the issue with the instructions, I'll pass it on to SuperSprings.
Javier G.
10/21/2025
They are working out fantastically! Now we dont bottom out and damage the sewer dump. Weve been all a long road trips and nothing is bothering us now in regards to suspension.
T
3/6/2026
Works great towing and seems to help with some sag and roll. I use them along with airbags so towing my fifth wheel is now worry free.
Mike L.
9/24/2025
Once you get the chance to tow your 5th wheel, please let us know how you like them!
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Nick S.
12/1/2025
That is great to hear! I am glad this addition has worked well for your setup. What RV do you have that you added this too?