SuperSprings Custom Suspension Stabilizer and Sway Control Kit
This item does not fit your vehicle
1985 Pontiac Sunbird
These items fit your vehicle
1985 Pontiac Sunbird
To see if this custom-fit item will work for you please tell us what vehicle you'll use it with.
Thank you! Your comment has been submitted successfully. You should be able to view your question/comment here within a few days.
Error submitting comment. Please try again momentarily.
When you’re towing a heavy trailer or hauling a full bed of gear, sag and sway can throw off your steering and braking. The SuperSprings Custom Suspension Stabilizer and Sway Control Kit adds 5,000 lbs of rear suspension support by bolting helper leaf springs above your factory springs. As the load increases, rollers on each end automatically engage to lift the rear, prevent bottoming out, and keep your truck level for safer handling.
Crosswinds, passing semis, and uneven corners can make a loaded vehicle feel unsettled. These heavy-duty helper springs act like sway bars, keeping your factory springs from twisting and reducing sway by up to 30 percent. The result is steadier tracking through turns and less rocking when road conditions change or big rigs pass.
Unlike air bag systems that need checking and adjustment, these springs automatically react to your payload. There’s no tubing or air pressure to monitor. When your factory leaf springs flex under load, the SuperSprings engage; when unloaded, they back off for normal ride comfort. That means consistent support without crawling under the truck to make changes.
Every setup is different, so the shackles on this kit give you multiple options. Choose an upper bolt position for maximum load support or increased ride height under constant weight, a lower position to keep the factory ride feel when driving empty, or a mixed setup that balances support and comfort. The dense polyurethane spring pads help keep everything centered and stable through it all.
Installing these helper springs is straightforward—just bolt them above your existing factory leaf springs. There’s no drilling required, and all mounting points line up cleanly. Once installed, the added support not only keeps your suspension level but also helps extend the life of your brakes, tires, and factory components over time.
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:
98% were satisfied with this product
2% 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!
Do you have a question about this Vehicle Suspension?
Info for this part was:
At etrailer we provide the best information available about the products we sell. We take the quality of our information seriously so that you can get the right part the first time. Let us know if anything is missing or if you have any questions.
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?