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Heavy trailers, campers, or bed cargo can make the rear of the truck sag and throw off your handling. The SuperSprings Suspension Stabilizer and Sway Control Kit adds 750 lbs of rear suspension support to keep your ride level and steady under load. These helper leaf springs bolt above your factory springs and automatically engage when weight is applied, lifting the rear end and preventing bottoming out without affecting unloaded ride quality.
Strong crosswinds, passing semis, or tight corners can push a truck around when it’s loaded. The SuperSprings design acts like a sway bar, reducing body roll and sway by up to 30 percent. Rollers at each end of the helper spring engage as the factory spring flexes, adding controlled resistance that steadies the truck on highways, mountain curves, or uneven surfaces for safer handling and smoother towing.
Every setup is different—some trucks carry constant heavy loads while others tow only occasionally. The kit’s adjustable shackles give you several installation options to dial in how much support you want. Use upper bolt holes for added lift and firmness under constant loads or older springs, lower holes to maintain factory ride height, or a mixed setting that balances comfort and support.
No drilling or air management needed—this kit bolts directly above the existing leaf springs using the included mounting hardware. For trucks with OEM springs above the axle, an additional mounting kit with 2-inch brackets provides the correct fulcrum points for quiet operation when unloaded. Once installed, the springs automatically adjust to the load with no maintenance required, extending the life of brakes, tires, and factory suspension components.
Alternate Instructions
Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.
Speaker 1: Today we're going to be taking a look at the SuperSprings lines of custom suspension stabilizer and sway control kits. You'll want to use etrailer's fit guide to determine the correct kit for your vehicle. Here's what our SuperSprings are going to look like once we have them installed. Now these are going to give us the support we need whenever we're hauling a heavy load or towing a heavy trailer. Typically, whenever we're hauling something extremely heavy our suspension wants to flex a lot and our back end sags down. Well these are going to provide us the extra support by activating whenever our suspension flexes, the rollers on the end of our leaf spring are going to activate our helper spring and provide us that extra support.
But also still giving us a nice ride when we're not towing something heavy, because it's going to deactivate those springs and still have a nice comfortable ride.And since they are attached to the front and back of our factory leaf springs, it's also going to act like a sway bar and it's going to prevent our leaf springs from twisting. Giving us a lot more stability when we're driving down the road. The multiple notches in the end here are going to provide us with a little bit of customization, depending on how much support we need. If we need more or if we just have a little bit of spring fatigue in our truck, it'll give us that little bit of lift so whenever we're towing something we don't have quite as much sag.We have a water tank in the bed of our truck as a heavy load or to simulate the tongue weight of a heavy trailer or a fifth wheel. So as I take the truck through my test course, I can definitely tell that there's a load back there.
The engine doesn't seem to be straining that much, but the bumps are extremely harsh and I can definitely feel it resonating through the seat. When I come to the slalom course and I'm going through the turns it definitely has a lot of body roll and I just generally feel like I need to slow down because it feels like it's leaning a lot and it's not responding quickly enough to the turns.The SuperSprings installed and I have the same load back there. When I'm driving through our course I can immediately tell a difference. The bumps aren't as harsh because the truck isn't sagging down as much and there's a little bit more support back there. But really where I tell a big difference is through the slalom course.
It definitely feels way more stable and even taking the turns going in and out, it just feels like it really wants to stick to the ground a lot better and just generally wants to go faster.Compared to airbags, these are a maintenance free option with no tubes to run or air pressure to maintain. Similar to airbags you can customize the level of support provided. Unlike airbags however you do this during the installation and set it one time rather than on the fly adjustability you get with airbags.And that completes our look at the SuperSprings line of custom suspension stabilizer and sway control kits.
Ratings & Reviews
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
Brooke M.
6/11/2025
That's awesome, Douglas! Great to know these have been the solution you were looking for. The Timbrens are known to be pretty stout for sure. I can totally see how these would have the right amount of give needed to support the camper and have a smooth ride :) Have you taken out the truck and camper recently?
Conrad
8/19/2021
After about one year, these are still working great. I typically use my truck for pulling my 5th wheel. But - even when empty, you dont really feel anything different. When the camper is on, it sure levels the truck and camper out perfectly, giving you a great ride.
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.
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.
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Howard
11/9/2020
One Year later still no sag.