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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: SSA16MXKT
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Vehicle Suspension

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1,650-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 SSA16MXKT can be ordered online at or call 1-800-940-8924 for expert service.
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SuperSprings Intl Vehicle Suspension - SSA16MXKT

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

1,650-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.


  • 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


  • Weight capacity: 1,650 lbs
    • SuperSprings will not increase your vehicle's weight-carrying capacity
  • U-bolt length: 5-1/4"
  • Limited Lifetime warranty
  • 30-Day satisfaction guarantee

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

SSA16 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 SSA16MXKT Installation instructionsAlternate Instructions SSA16MXKT Installation instructions

This Product Fits The Following Vehicles

Customer Reviews

SuperSprings Custom Suspension Stabilizer and Sway Control Kit - Factory Leaf Springs Above Axle - SSA16MXKT

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

1,650-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.

2019 Ram 2500

If you watch the video on installation from the model - SSA13MXKT, you will see how to install them, that's why I don't have any pictures. It took me about 2-1/2 hours to install. The brackets were a plated color and I painted everything black before installed them. My truck was pretty clean underneath so I think they look better. I installed them on a 2019 GMC Denali HD 2500 Duramax. As far as handling, after the install, I did not notice too much difference empty. But - when I had my 5th wheel hooked up, there was a difference, not a significant amount, but a difference. My pin weight on the trailer is roughly 1,350 lbs. also. Now for the dimensions here is what I got - I would say, these dimensions are within an 1/8". The dimensions were taken from the center of the tire to a line on the truck, front and rear.
Rear - 43"
Front - 40-1/8"
Rear - 44"
Front - 40-1/16"
1,350 lbs. Pin Weight (CAT Scale Certified)
Rear - 42-5/8"
Front - 40-1/8"
As you can see, it dropped the truck down 1-3/8". Before the install my truck would "squat" approximately 2-1/2" So, they made a big difference, an 1-1/8" difference. Before the install, the front was about (I never got a good measurement on that) 41".



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.



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.


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


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.


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.


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 rear of vehicle. I like this system better than air shocks as there is no adjustment after installation. I would purchase again.


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.


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.


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!


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.


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


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).


These springs improved the ride considerably , less roll on corners with the slide in camper on and wheel hop on rough roads . In general the handling was much improved.


Looks like good product.
Haven't installed
them yet but looks like good quality.


Had a pro install them to the center hole like Manufacturer suggest, rides a little firmer which I like not sloppy, Have not towed yet but looking forward to it! Great products and fast shipping.


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.


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.


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.


i have these on a couple of trucks and they work great.more reliable than air bags


This helped immensely with the wondering in the steering of my e350. The shop that I had install it has been recommending this to their customers


Pretty sweet. Immediate and noticeable improvement for my sprinter conversion. Disappointed I waited so long to install.


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!


I am 100% pleased with etrailer...received wrong suspension because of manufacturer's misrepresentation...Tiffany at etrailer corrected everything...sent a prepaid UPS label to send it back...sold me the proper stabilizer springs...and gave me 100% credit back on the wrong purchase...these people are true to their word and I recommended them to everyone...P.S. today I installed the new stabilizers and they work like a charm...and...I talked to Tiffany on Monday the 9th...received the new stabilizers on Wednesday the 11th and installed them on Thursday the 12th...10 thumbs up to Tiffany and etrailer...thanks,


These worked great crossing the country last month.

Show More Reviews

See what our Experts say about this SuperSprings Intl Vehicle Suspension

  • 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....
    view full answer...
  • 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...
    view full answer...
  • 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...
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  • 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.
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  • Recommendation to Reduce Sway on 2022 Chevy Silverado 2500 With Firestone Ride-Rite Air Bag Helpers
    I recommend looking into the SuperSprings Custom Suspension Stabilizer and Sway Control Kit # SSA16MXKT to pair with the Firestone Ride-Rite Air Helper Springs # F2613 on your 2022 Chevrolet Silverado 2500HD. These are confirmed to fit while the TorkLift StableLoad Rear Suspension Upgrade # TLA7311 you found will not fit your truck. The SuperSprings are always active so you will not have to turn them on or twist them off every time you wish to activate and deactivate them.
    view full answer...
  • How to Determine Which Hole Setting to Use When Installing SuperSprings # SSA16MXKT
    There are different situations where SuperSprings recommends using different bolt holes of the # SSA16MXKT to give you the optimum support and ride quality. 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,...
    view full answer...
  • Which Super Springs for 2019 GMC Sierra 2500 for Towing 5th Wheel Trailer with 1400-lbs Pin Weight
    Yes. The Sumo Springs Super Springs # SSA16MXKT are a great choice to help give you a bit of extra support when towing your 5th wheel. These aren't going to create any lift when the truck is unloaded and will only activate when the truck is under a load to help keep the ride height factory at all times, so they're a great solution for your 2019 GMC Sierra 2500. These springs will also help reduce sway and prevent sagging to improve the safety of your towing experience, as well. If vehicle...
    view full answer...
  • Can SuperSprings Be Used in Conjunction with Air Bags
    As long as the installation of the airbags on the truck and the SuperSprings Custom Suspension Stabilizer and Sway Control Kit # SSA16MXKT do not interfere with one another combining them will be an improvement.
    view full answer...
  • Replacement Parts For Thule Telescoping Ladder # TH301404
    When it comes to replacing parts on The Thule Telescoping Ladder for Vans - 9 Steps - 8-1/2 foot # TH301404 we do not have replacement parts. You will have to purchase the whole kit. The ladder can easily attach to the vehicle wall using the magnetic fixation kit which is included. I attached a review video link below.
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Info for this part was:

Employee Leah B
Edited by:
Leah B
Employee Andrew K
Video by:
Andrew K
Employee Jameson C
Expert Research:
Jameson C
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

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