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SuperSprings Custom Suspension Stabilizer and Sway Control Kit - Factory Leaf Springs Above Axle
SuperSprings Intl

SuperSprings Custom Suspension Stabilizer and Sway Control Kit - Factory Leaf Springs Above Axle

Part Number: SSA13MXKT
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$794.98
Vehicle Suspension

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3,000-lb Capacity. Upgrade your vehicle's rear leaf spring suspension with these helper springs. They reduce sway and prevent sagging, which is perfect for towing or hauling heavy loads. Designed for factory springs that sit above the axle. Great Prices for the best vehicle suspension from SuperSprings Intl. SuperSprings Custom Suspension Stabilizer and Sway Control Kit - Factory Leaf Springs Above Axle part number SSA13MXKT can be ordered online at etrailer.com or call 1-800-940-8924 for expert service.
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SuperSprings Intl Vehicle Suspension - SSA13MXKT

  • Leaf Springs
  • Rear Axle Suspension Enhancement
  • SuperSprings Intl
  • Standard Duty

3,000-lb Capacity. Upgrade your vehicle's rear leaf spring suspension with these helper springs. They reduce sway and prevent sagging, which is perfect for towing or hauling heavy loads. Designed for factory springs that sit above the axle.


Features:

  • Reinforces your vehicle's rear suspension with extra leaf springs that prevent sagging and reduce sway by up to 30 percent
    • Works like a sway bar to stabilize your factory springs and keep them from twisting
    • Compensates for windy conditions, wind turbulence from big rigs, and weight shifts while cornering
    • Lifts your vehicle when you are carrying a heavy load and prevents bottoming out
  • Adjusts automatically to your payload
    • Rollers on each end of the SuperSprings activate when the factory springs flex under load
    • Rollers deactivate when factory springs aren't under load
  • Offers different settings so that you can customize the system to your needs
    • Choose a setting that increases load support and ride height for constant heavy loads or to compensate for minor spring fatigue in an older vehicle
    • Choose a setting that maintains the original factory ride conditions and minimizes effect on unloaded ride quality and height
    • Choose a medium setting that balances support, height, and ride comfort
  • Extends the life of brakes, tires, and factory suspension
  • Requires no maintenance - no tubing or air pressure to monitor or adjust like air springs
  • Installs easily - no drilling required
    • Bolts on above your factory leaf springs
  • Includes a mounting kit for installing SuperSprings over factory leaf springs that sit above the axle
    • Ensures that SuperSprings operate silently when your vehicle isn't loaded
    • Comes with extended-length U-bolts to fit factory spring packs that are greater than 2-3/4" tall
  • Made in the USA


Specs:

  • Weight capacity: 3,000 lbs
    • SuperSprings will not increase your vehicle's weight-carrying capacity
  • U-bolt length: 5-1/4"
  • Warranty:
    • 2-Year limited for commercial applications


Mounting Kit for Factory Springs Over the Axle

SuperSprings diagram of springs set above the axle

An additional mounting kit is included for installation on suspensions with leaf springs that sit above the axle. This mounting kit ensures that the SuperSprings operate silently when your vehicle isn't loaded. The brackets in the mounting kit act as fulcrum points on the underside of the SuperSprings. Furthermore, the shackles at the ends of the SuperSprings hold the spring in place and pivot as the load is transferred to the SuperSprings. Because there is minimal preload tension in the installed SuperSprings, you get a quieter ride.


SuperSprings Suspension Enchancement

SuperSprings diagram of roller and shackle system for extra leaf spring

These additional leaf springs add support and sway control to your existing factory suspension. Just bolt on SuperSprings over your factory springs, and they automatically work when you need them. As the factory spring flexes, a roller at each end of the sturdy helper spring reacts to engage the helper spring and to provide extra support. The springs help to better distribute cargo weight throughout your existing suspension, channeling that weight to the points on the frame that are designed to support heavy loads.


SuperSprings leaf spring installed on a Ford vehicle

Placing these leaf springs above your factory springs helps to keep your factory springs from twisting, so the SuperSprings act like a sway bar, reducing the body roll that makes driving more difficult and dangerous. With these helper springs, driving is safer and easier when it's windy, when your vehicle is rocked by a passing semi, and when cornering. The springs help to reduce sway by up to 30 percent. SuperSprings also allow more wheel travel in the rear suspension when they are under load, so they maintain traction and ride comfort better than rubber or polyurethane bumpers. That means they're great for drivers who frequently tow.


SuperSprings are a maintenance-free, low-cost alternative to air spring systems, which require constant monitoring and air pressure adjustment. These helper leaf springs respond automatically to the load you carry, so there is no crawling under your truck to adjust them. You'll also reduce wear and tear on your suspension, brakes, and tires, which saves you money. The bolt-on installation means that they are easy to fit - no drilling required.


Customizable Suspension Support

Truck before SuperSpringsTruck after SuperSprings

You can also customize the level of support provided by SuperSprings. For most models, the shackles that attach the helper leaf springs to your existing leaf springs have different installation options:

  • For greater support and ride height when your suspension is under a constant load or if you have an older vehicle with some spring fatigue, install the helper springs using the upper bolt holes
  • To maintain the factory ride and reduce the effect on your ride height, install using the lower bolt holes
  • To balance support, height, and ride comfort, install using the upper hole on one end and the lower hole on the other


SSA13 Super Springs Overload Spring Suspension Enhancer - Anti Sway

MXKT Super Springs Mounting Kit for OEM Leaf Springs Above the Axle - Extended U-Bolts

Installation Details SSA13MXKT Installation instructionsAlternate Instructions SSA13MXKT Installation instructions

This Product Fits The Following Vehicles




Customer Satisfaction Score:


Customer Reviews

SuperSprings Custom Suspension Stabilizer and Sway Control Kit - Factory Leaf Springs Above Axle - SSA13MXKT

Average Customer Rating:  4.7 out of 5 stars   (242 Customer Reviews)

3,000-lb Capacity. Upgrade your vehicle's rear leaf spring suspension with these helper springs. They reduce sway and prevent sagging, which is perfect for towing or hauling heavy loads. Designed for factory springs that sit above the axle.

by:
2015 Chevrolet Silverado

Added these springs to my 2500 Silverado to prepare for a slide in camper. They made quite a difference. I did it myself, but two people would be easier. The ride is naturally a little stiffer when empty, but that's the trade off.



by:
2022 GMC Sierra 2500

Great product, very clear instructions. I really appreciated the stickers on each spring showing the correct orientation, that took all of the guess work out of it.

Thanks Supersprings for making a great kit and confirming the product would work with the airbags I had installed.



by:

My sales rep was professional and know exactly what I needed. I also needed fast delivery of the auto parts I ordered and they arrived right on time.



by:

They work great and have no problems



by:

Packages arrived on time, everything was there, installation went good, I removed the rear tires to make it easier, picked the rear of the truck up by 1 3/4 inches, have not hooked up 5 th wheel yet, we will see if it helps with the bottoming out .

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 .



by:

This was installed on a Chevy 1 ton with camper works great for helping sway
and suspension



by:
1997 Chevrolet C/K Series Pickup

Awesome! easy to install
Makes big difference
when towing 6000lb loads



by:



by:



by:
2017 Chevrolet Silverado 2500



by:
2020 Chevrolet Silverado 2500



by:



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by:
2021 GMC Sierra 2500



by:

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.



by:

They increase the carrying capacity of the stock springs by adding an additional leaf. We drive our van with most of the load above the rear suspension and it was bottoming out on occasion. Works as advertised; no more bottoming out! It is a bit of a struggle to install, so a professional may be needed



by:

The Super Springs work great! I pull a 8,500# trailer with a hitch weight of 950# with a 2004 GMC Sierra 1/2 Ton. The truck pulls fine but even with an equalizer hitch still had some sag. The Super Springs were easy to install and leveled the rig. After a year everything still works great.



by:

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.



by:

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.



by:

I got this to prevent bottoming out my truck when towing our travel trailer. Won't know for sure if this actually works until we load up. Having said that, the instructions provided with this are poor and talking with Supersprings tech support was frustrating. As mentioned elsewhere, you will need two "C" clamps to pre-load the spring and I wound up fabricating a 3" extension bracket for the brake lines; neither of which were mentioned in the instructions. I also removed the wheels to provide working space and air tools are definitely the way to go. On my '13 Tundra, the distance between the stock spring pack straps is 40" the same as the distance between the eyes on the Superspring. I was advised that the spring is mounted off-center to avoid conflict with the stock spring straps; however this in not mentioned in the instructions. This placed the Superspring about 4" forward of the center of the axel instead of centered on the axel. (see photos) This seems counterintuitive to me but we'll see. This added 1.5" in height to the rear of the truck. It took me 4 hours to install by my self, including time to fabricate the brake line extensions and dealing with Supersprings staff twice on the phone. During the second call, the tech mentioned that they get a lot of phone calls for Tundra installs, indicating to me that they already know there are issues with the product and instructions. In retrospect, I would look for a new spring pack if I was doing this again. Hopefully my suspicions are unfounded but I'm hanging on to the box just incase. Etrailer was great with the best price anywhere and quick shipping.



by:

The kit looks really good but I can’t figure out how to install. Enclosed are two photos showing my van suspension and the parts your sent. The instructions do not show my van with only one spring. Can you advise?????????????? Thanks.



by:

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!



by:

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.



by:

Great product, fast shipping. My only complaint is the package was delivered with both ends of the box ripped open. Luckily no missing components



by:

E-trailer agent James helped find trailer tow package that fit my 2011 Ford Transit Connect and provided appropriate install video. You're a huge help James. The install went smoothly without a hitch (lol).


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See what our Experts say about this SuperSprings Intl Vehicle Suspension

  • Additional Stability and Sag Prevention With TorkL
    I recommend adding the SuperSprings Custom Suspension Stabilizer and Sway Control Kit # SSA13MXKT on your 2019 GMC Sierra 2500 as you already have the TorkLift StableLoad Suspension Upgrade w Quick-Disconnect # TLA7310S.
    view full answer...
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  • Recommended Suspension Enhancement To Level A 2020 Chevy Silverado 2500 Out While Hauling A Trailer
    Hey John, If you're referring to the SuperSprings # SSA13MXKT you wouldn't really be getting much of an improvement over the RAS system since they operate the same way and both have similar capacities. Air springs would allow you tor adjust the height quite a bit more precisely but require a maintenance and you'd need an air compressor to adjust the psi levels. You could increase the capacity of your jounce springs to ones like the # SSR-203-47-2 but that could affect you unloaded ride...
    view full answer...
  • SuperSprings Custom Stabilizer and Sway Kit For a 2004 Chevrolet Silverado 2500HD
    The SuperSprings Custom Suspension Stabilizer and Sway Control Kit # SSA15MXKT will fit your 2004 Chevrolet Silverado 2500HD. These are designed to assist up to 2,600lbs of weight with trucks that have the leaf springs mounted above the axle. This will not increase your weight capacities they are only assisting your suspension. You also have the option to use the SuperSprings Custom Suspension Stabilizer and Sway Control Kit # SSA10MXKT. This has a lower weight rating at 1,650lbs capacity....
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  • Comparing The SuperSprings SSA16 And SSA13 For A 2012 GMC Sierra 2500 Denali 4x4
    Hey Scott, I try to stick around the payload capacity of the vehicle when choosing this type of suspension enhancement. Anything more is pretty much just overkill and can sometimes negatively affect your ride quality. The SuperSprings Custom Suspension Stabilizer and Sway Control Kit # SSA16MXKT has a 1,650lb load leveling capacity, which is almost twice what you're hauling so it'd be the better option unless you plan on hauling heavier in the future. SuperSprings only activate as weight...
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  • Correct SuperSprings for a 2017 GMC Sierra 2500
    The correct SuperSprings Custom Suspension Stabilizer and Sway Control Kit (part # SSA16MXKT rated for 1,650 lbs or part # SSA13MXKT rated for 3,000 lbs) for your 2017 GMC Sierra 2500 will largely be dependent on the amount of weight you are carrying/towing. If you can let me know how much weight you are carrying/towing I would be happy to make an exact recommendation. That said, the part # SSA16MXKT would have you covered for most applications and it would not affect the ride too much...
    view full answer...
  • Comparing SuperSprings Custom Suspension Stabilizers for 2016 Chevy Silverado 2500
    I recommend the SuperSprings Custom Suspension Stabilizer and Sway Control Kit part # SSA13MXKT for a 2016 Chevrolet Silverado 2500 which is rated at 3,000 lbs over part # SSA16MXKT which is rated for 1,650 lbs. The reason being, the heavier trailers; larger gooseneck, fifth wheel, and in-bed campers will see greater benefits from the higher capacity whereas smaller bumper pull trailer will see benefits from the lower capacity.
    view full answer...
  • Troubleshooting SuperSprings Squeaking When Installed On a 2022 Chevy Silverado 2500
    I reached out to SuperSprings for help to determine what may be causing the Suspension Stabilizer and Sway Control Kit # SSA13MXKT to squeak on your 2022 Chevrolet Silverado 2500. They informed me over tightening the lower shackle bolts can cause squeaking. Please try loosening these bolts to determine if that will fix the issue. Please let me know if this does not fix the squeaking.
    view full answer...
  • Do You Recommend Timbrens Along with My SuperSprings on My 2021 Silverado 2500?
    Since you are towing a 40-foot 14,000 pound fifth wheel toy hauler, the option of installing Timbrens is not required and is purely a matter of comfort. If you find that the ride is still rough with the SuperSprings Custom Suspension Stabilizer and Sway Control Kit - Factory Leaf Springs Above Axle # SSA13MXKT, I recommend purchasing Timbrens in addition to your already-purchased. The Timbrens that will work amazingly with your 2021 Silverado 2500 HD with the SuperSprings is the Timbren...
    view full answer...
  • Will SuperSprings Stabilizer and Sway Control Kit Increase 2022 Chevy Silverado 2500 Towing Capacity
    Suspension enhancement kits, like the SuperSprings Custom Suspension Stabilizer and Sway Control Kit # SSA13MXKT, help to support the factory suspension on your 2022 Chevy Silverado 2500, but they won't increase the weight capacity of your vehicle. The only way to increase your weight capacity is to have the Chevy look at your vehicle and have them install what they deem is necessary (if at all possible). If you're needing to tow a trailer that's over the weight rating of your truck then...
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  • SuperSprings and SumoSprings on 2016 Chevrolet Silverado 2500HD
    Yes, you can use both the SuperSprings Custom Suspension Stabilizer # SSA13MXKT with a set of SumoSprings # SSR-203-47-2. These will not increase the weight capacity of your vehicle, they will improve your ride quality and reduce squat when hauling heavy loads. For the SuperSprings use this kit # MXKT to mount your SuperSprings leaf spring helper kit if your factory leaf springs are located above your axle and your spring pack is more than 2-3/4" thick.
    view full answer...
  • Suspension Enhancement Recommendation for 2018 Chevy Silverado 2500HD with Truck Bed Camper
    For your 2018 Chevy Silverado 2500 the Timbren kit part # TGMRCK25D is a confirmed fit and would work well. For in bed campers most people really like the SuperSprings like the part # SSA13MXKT as this provides additional support but also acts as an anti-sway bar which helps with top heavy truck bed campers.
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  • Installation of SuperSprings Stabilizer and Sway Control Kit SSA13MXKT on 2016 Chevy 2500 HD Diesel
    Yes, one of the features of the SuperSprings Custom Suspension Stabilizer and Sway Control Kit # SSA13MXKT is the ability to alter ride height. For greater support and ride height when your suspension is under a constant load or if you have an older vehicle with some spring fatigue, install the helper springs using the upper bolt holes. To maintain the factory ride and reduce the effect on your ride height, install using the lower bolt holes. To balance support, height, and ride comfort,...
    view full answer...
  • Recommended Suspension Enhancement For A 2016 Chevy Silverado 2500 Towing A 5th Wheel
    Suspension enhancement will never increase the capacity of your truck, but it will definitely help offset the load for a safer and more comfortable ride quality. Since you'll be close to your maximum capacity I recommend going with the SumoSprings Rebel Custom Helper Springs # SSR-203-47-2. These springs are designed with a progressive load control, meaning that the more weight you place on them the stiffer they become. The SuperSprings Custom Suspension Stabilizer and Sway Control Kit...
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  • Which SuperSprings Kit Fits 2023 Chevy Silverado 3500 Single Rear Wheel
    The correct SuperSprings kit for your 2023 Chevy Silverado 3500 4x4 crew cab single rear wheel is the part # SSA13MXKT and the # SSA42 that you mentioned does not fit.
    view full answer...

Do you have a question about this Vehicle Suspension?


Info for this part was:

Employee Leah B
Edited by:
Leah B
Employee Andrew K
Video by:
Andrew K
Employee Adam R
Expert Research:
Adam R
Employee Dustin K
Video Edited:
Dustin K
Employee Mary K
Written by:
Mary K
Employee Wilson B
Updated by:
Wilson B
Employee Alex H
Updated by:
Alex H
Employee Noah M
Updated by:
Noah M
Employee Robert C
Installed by:
Robert C
Employee David F
Test Fit:
David F

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