SuperSprings Custom Suspension Stabilizer and Sway Control Kit
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1988 Toyota 4Runner
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1988 Toyota 4Runner
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Hooking up a trailer or loading heavy gear can make the rear end sag and throw off your handling. This SuperSprings Custom Suspension Stabilizer and Sway Control Kit adds up to 1,900 lbs of rear suspension support by bolting helper leaf springs above your factory springs. They lift and stabilize the rear when hauling or towing, keeping your ride level and steering confident without bottoming out.
Crosswinds, road dips, or trailer sway can push your truck around. These helper springs work like sway bars to keep the factory springs from twisting and cut body roll by up to 30 percent. The result is a more stable, planted feel when cornering, passing semis, or driving in windy conditions.
There’s no need to add air or make manual adjustments. Rollers on each end of the SuperSprings engage automatically as the factory springs flex under load, then back off when they’re not needed. The system adapts on its own to your payload, giving you consistent support without maintenance or air pressure checks.
Different loads call for different setups. Adjustable shackles let you choose how much support and lift you want—select a higher setting for constant heavy loads or an aging suspension, a lower one to keep the stock ride feel, or a middle position that balances comfort and height. It’s simple to set up for how you use your truck.
Installation is straightforward—just bolt the helper springs above your existing leaf pack with no drilling required. Dense polyurethane pads seat between the spring sets to prevent shifting, and the high-grade steel construction means reliable performance that helps extend the life of your brakes, tires, and factory suspension.
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.
Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.
Ellen: Hey everybody. I'm Ellen here at etrailer.com and we're going to be taking a quick look at the SuperSprings custom sway control and stabilizer kit. This relieves a lot of issues that come up whenever you're putting some extra weight in the back end of your vehicle. Maybe you're putting in some big toolboxes, converting your truck into a work truck, or any time you're just putting a constant load into your vehicle that you're going to have all the time. It affects the overall handling of your vehicle. It doesn't stop as effectively, it can cause the vehicle to bottom out more, and just makes the overall ride experience more uncomfortable.
So by putting these in there, this is basically going to just stiffen up our suspension. It's pretty much just adding an extra leaf spring to your suspension already.If you compare this to other suspension enhancement systems, I think this is a pretty nice way to go, if you have a constant load, again, in your vehicle. If you are going to be varying the load, maybe you're carrying a fifth wheel camper or something like that, where you're going to be putting weight in and taking it back out, something that's adjustable, like air springs would be better. The downside to air springs is that they take a lot of maintenance. You've got to worry about your air lines and keeping air in the bags and worrying about if those air lines are going to get messed up or anything if you're going to be a little bit rougher with your truck or anything like that.
So they can be kind of tedious. A lot of times, it's a good idea to get compressor. Compressors are expensive. So that's something to think about there.If you compare this to other systems that are static, like a solid spring, like a jounce bumper style enhancement, these are nice because they're not going to have that sort of rough engagement like a lot of jounce style springs will. There's usually a gap in between the frame or the axle and the spring itself or the bumper itself.
So whenever it finally hits, you really feel that smack and it can really feel bumpy and uncomfortable. If that spring is constantly engaged, it's usually better, but if you're just putting weight in this all the time, this is a really good solution for you. So, great idea for work trucks or anything else that's going to be under a constant load.So let's take a closer look, talk a little bit more about how this is going to install. Basically, these just go right over the top of your spring pack. So again, there's no cutting or drilling required with these.
They just sit right on top. You do get some of these polyurethane bushings, which kind of sit over that spring pack and make sure that there's no movement for your spring. It comes with two different kinds. It kind of depends on your install as far as which one you'll use, but it does come with instructions on how to do that.Also comes with a bracket that's going to go towards the front end of the spring, or towards the front end of your vehicle. There's a little bit of adjustability as far as how much engagement you get out of these springs. You can see we'll have our bolts for wrapping around our spring pack there, the bottom holes, for a little bit gentler support. So if you just need a little bit of help there, that bottom hole should work out fine. If you find that you need a bit more, you can put it into the top hole on either side. And then if you feel like you needed somewhere kind of in the middle, you can do one low one high or vice versa to kind of give that Goldilocks feel. So you have three different choices as far as how much these are going to provide support.Again, just wraps right over your suspension. You will need to lift the vehicle off the ground a little bit, just that back end, to let the axle hang a little. Nothing too bad. You do want to make sure that you're being safe with that. Do it on a level surface, using jacks, supporting everything, and staying safe while you're getting this installed. But pretty straightforward as far as that goes. And no maintenance, which is always nice. So you just put it in there and forget about it, once you get everything adjusted where you want it to be.This is a custom fit for the 2017 through the current year model of the Ford F-350. That's for the two wheel drive and the four wheel drive. And that's pretty much all there is to it for our look at the custom fit SuperSprings for sway control and stabilizing.As far as weight capacity, they do have a weight capacity of 1900 pounds. That doesn't increase the overall payload or towing capacity of your truck. You still want to go by all of the manufacturer's recommended weights. It's just kind of like having a brace there for helping to lift weight more effectively and safely, rather than helping you to max out at a higher level, if that makes sense.So I hope this has been helpful in deciding if this is the right kit for you. Again, I'm Ellen here at etrailer.com. We've got all kinds of accessories for your trucks and trailers, so check them out. Thanks for watching.
Customer Satisfaction Score:
79% were satisfied with this product
21% of customers were not satisfied
Ratings & Reviews
Product worked as described. Shipping was quick (etrailer used "air" to my state, then on UPS truck)
Easy to install, not sure why they included 2 sets of polyurethane blocks (only one set fit my truck)
Don't notice any ride difference when set at lowest setting. Raised truck approximately 3/4". East to readjust for more preload if needed.
Combined these Super Springs with Timbren load handlers. So far so good.
Great improvement over stock while maintaining ride quality.
2013 Toyota Tundra 4x4. Installation went well in my garage with a medium sized C-Clamp. The ride feels that same as stock. Lifted the rear 1.5" which helped off set the 2.5" lift in the front from Fox 2.0 shocks. I have not hauled a load yet.
Installing these on a 2020 F250 was easier than I thought it would be. I was able to get the springs on whit the center piece and the front shackle bolted without jacking up the truck. I had to jack the frame up a few inches on each side to get the back shackle bolt through. I put the shackle bolts through the bottom holes since I only need the extra support when I tow. I recommend air / power tools for the shackle nuts and it doesn’t hurt using them for the center bracket u bolts. They are lock nuts and they have a long way to run on for each bolt. I did have to bend my parking brake cable hangar out a bit for one of the shackle bolts to clear the cable. The truck seems to sit a little higher in the back. Maybe an inch or so. The ride empty seemed the same except it felt like it didn’t roll quite as much when turning. Rolling over a lip at the end of our driveway the extra stiffness was noticeable, however. I won’t know how well they really work until I get my fifth wheel hooked up.
Couldn’t install on my Class C due to the placement of a propane line from the manufacturer. I was very pleased with the weight and solid construction.
Easy to install and they definately keep my pick up from squatting as much with our trailer hooked up.
This was by far the easiest mod I have made to my 2019 Ford Super Duty King Ranch! Only took 45 minutes start to finish. Didn't even take the wheels off. Took some pressure off of the springs by lifting the rear end a little using the trailer hitch. Used the bottom holes on both ends and only raised the rear of the body 1 inch. Great product!
You should inform customers about special tools needed to preform install. Not on easy install as stated in video
I installed the springs in a little over an hour but have yet to put our 15,500 lb 5th wheel RV on the truck. The pin weight is around 2,800 lbs when she is fully loaded, so we will see if these help us with the sway and porposing, also the side weight when starting into a curve.
Our order arrived promptly and in good order. We have used these springs in the past and this is a repeat order for our inventory.
These leaf springs works great !! More stable my van but I would like that it brings up an inch !!! Great buy
No issues with install on a 2023, E350 Class C motorhome.
After chalking the front wheels, I used two 3 ton floor jacks with 13” 6x6 blocks just behind the springs to lift the frame and rear tires off the ground to remove the wheels. For safety, 3 ton jack stands were put under the axles during spring installation
After installing the springs per manufacturer instructions, two 1/2” x 10” pieces of all thread with drilled flat bar were used to compress the front end spring.
With the least amount of preload it raised the back a good inch.
The 800# trailer tongue weight will be the next test to see if more preload is needed for a level ride height.
I have the Yakima EXO Swing Away Storage System w/ 2 Enclosed Cargo Carriers - 2" Hitches on my 2025 Airstream Interstate. They were causing the van to sag. The Springs went on Fairley easy and provided the lift I needed.
Installed on a 2016 Toyota Tundra. I pull a 28 foot aluminum frame utility trailer. Hauls like a 3/4 ton with super spring. Rides like 1/2 ton without load. I have put 1 ton load on truck with no trailer and the truck drove fine. The front of truck at tires rose 1/2 inch. Installation requires the frame to be lifted off the axel.at rear of vehicle. I like this system better than air shocks as there is no adjustment after installation. I would purchase again.
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.
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.
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.
Best product ever purchased
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