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Heavy loads can cause rear sag that throws off handling and braking. The SuperSprings Custom Suspension Stabilizer and Sway Control Kit adds up to 2,900 lbs of rear axle support by mounting helper leaf springs above your factory springs. They automatically engage as the stock springs flex under weight, lifting the truck back to level and preventing bottoming out. With more even weight distribution across the suspension, braking and steering stay consistent even when the bed is full or a trailer is hitched.
Crosswinds, passing semis, or sharp turns can make a loaded vehicle feel unstable. These helper springs act like sway bars by keeping your factory springs from twisting, cutting sway by up to 30 percent. The extra control means less body roll when cornering and a smoother, safer ride in wind or uneven road conditions. The system even helps maintain better traction under load since it allows more wheel travel than rubber or polyurethane bump stops.
Every setup is different, so these helper springs let you choose how firm you want the ride. The shackles have multiple bolt holes for customizing support—use the upper holes for maximum load strength or to compensate for older spring fatigue, lower holes to preserve factory ride height, or a mixed setup for balanced comfort and support. Once installed, the springs automatically adjust to your payload without any air lines or PSI checks needed.
Adding serious load control doesn’t need to be complicated. These helper springs bolt right on above your existing leaf springs with no drilling required. For some models with factory springs above the axle, included poly spring pads keep everything properly seated. With no air tubing or maintenance to worry about, this setup reinforces your suspension, extends the life of your brakes and tires, and stays ready for every haul without extra effort.
Customer Satisfaction Score:
93% were satisfied with this product
7% of customers were not satisfied
Ratings & Reviews
Added these to my Mercedes air stream 19x class b van that already has 2 leaf springs. Had swaying issues at 60MPH and up. These put a stop to it right away and kept from sagging in the rear when loaded up with all our gear and water tank full. I have them on the mid setting. My van is 4wd and already lifted so didn’t raise it more than 1/2in. Still has a smooth ride and no big jolts like air bags or sumo springs.
I bought these a year ago so not sure if anything has changed Bad thing is they are slightly too long, Just enough to touch the wheel well and rub the under coating off. If you’re going to install yourself, I found a good you tube install. The U-bolts for install are too short. Need 2 forged C-clamps.
These are a 100% buy, don’t mess with air bags or sumos. These adjust themselves with load or no load.
I bought these as part of my suspension modifications . I had them installed on my Ford F350 SB . I have an Arctic Fox 865 truck camper. It’s a heavy camper so to minimize sag and sway I installed Timbren bump stops, a hellwig bigwig sway bar,Torque lift stable loads. That improved things quite a bit. I installed these super springs last ,they further improved sway and improved the overall stability and ride quality.
I definitely feel these were worth purchasing. I could not decompress the existing leaf springs enough to install these myself so had them professionally installed.
I would recommend them for hauling a truck camper.
Without towing, the truck seems to ride a little smoother. The real test will come when I hook up my fifth wheel. Very simple to install.
This product did exactly what I needed. Lift the RV up to unloaded height. I have not exceeded the 12500 GCWR but the rear end was dragging like it was severely overloaded. It was a very tight fit because the mud flap framing and gas lines were almost in the way. An entire day later with a couple of clamps and sore wrists at max setting fixed the sag perfectly! I wish I had before and after pictures. I can almost fit my head in the wheel where I could not get my arm in before.
Fast delivery, free shipping, the springs went on pretty easy, had some problems with install due to my vehicles configuration, Travato59K,not the springs. This was a 2024 RAM Promaster3500, raised it up 1.75” on the lower setting. Noticeable help with sway problem.
The shackles on each end were too narrow to clear the spring clips so locating them was harder than need be. The instructions had a mistake, locating the front shackle incorrectly. Installed as they are. Improved ride a lot. Glad I got them.
Exactly what I needed and what I wanted very fast shipping thanks E trailer
While use the middle setting it only gave it a slight lift with a minimal unloaded bounce. Usually never overload the trucks maximum capacity but needed to for a short distance and with approximately 1300 pounds in the bed, the truck didn't squat at all.
This was a great addition to the suspension of my 2021 Ford E350 Class C RV. The rear springs were at almost max load. This raised the chassis at the rear axle almost 2-inches. This is a heavy duty spring and I had to fabricate a tool to compress the spring.
Fit great on my 2025 Ram. I makes a big difference pull my 14000lb 5th wheel. Highly recommend these for any heavy loads. I have put these on 3 other trucks and they are maintenance free. You don't need to worry about the load you are hauling.
Great product and fit. A bit difficult for two 73 year old men to install, but it’s done.
Excellent customer service and quick delivery. Will definitely use them again
I think they perform exactly as advertised. I will admit, they took some patience and strength to install. I believe it was more hours then the estimate that was shown, but that's because I don't have the install compression tool and had to make my own... Otherwise, it performs perfectly, you can feel the difference immediately, price is good and quality is there. Quality is something that is lacking in many products in todays world, but not on this one. Thanks!
SuperSprings were a great addition to our van. Sway control improved immediately with the SuperSprings. The process to install SuperSprings was moderately challenging but my son and I got them installed at home. Purchasing a set of C-clamps made it possible. Definately worth their price!
Unbelievable! Why didn’t I do this sooner? I’ve never seen daylight between my tires. Gaines two inches and rides soooo much better.
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