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  1. Vehicle Suspension
  2. SuperSprings Intl
  3. Bump Stops
  4. Towing/Load Leveling
  5. Rear Axle Suspension Enhancement
  6. Light Duty
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2021 Ford F-150
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SuperSprings Intl

SumoSprings Solo Custom Helper Springs - Rear Axle

Part Number: SS85NV
In Stock
$258.99
Vehicle Suspension
Not Confirmed to Fit

2021 Ford F-150

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1,400-lb Capacity. Upgrade your vehicle's rear suspension with these maintenance-free helper springs. Sturdy microcellular urethane springs cushion bumps and help support a heavy load to level your ride and minimize sway. No-drill installation. Great Prices for the best vehicle suspension from SuperSprings Intl. SumoSprings Solo Custom Helper Springs - Rear Axle part number SS85NV can be ordered online at etrailer.com or call 1-800-940-8924 for expert service.
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  • Reviews (2544)
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  • Videos (2)
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SuperSprings Intl Vehicle Suspension - SS85NV

Highlights

  • Custom Fit for Your Vehicle: Mounts to existing attachment points
  • 1,400-lb Rear Support: Keeps your vehicle level under load for steadier towing and hauling.
  • No Upkeep Needed: No air lines or pressure checks—just install once and forget it.
  • Smoother, Quieter Ride: Cushions bumps with microcellular urethane to cut harsh rebound.
  • Better Handling in Turns: Each spring works independently to reduce roll and sway.
  • Built to Last: Resists oil, salt, UV rays, and temps from -25 F to 200 F for long-term reliability.
Made in USA

Features to know about

Stay Level and in Control Under Load: 1,400-lb Rear Suspension Support

When towing or hauling heavy gear, rear-end sag can mess with steering, braking, and headlight aim. These SumoSprings helper springs add up to 1,400 lbs of support at 50-percent compression to keep your ride level and steady. They help your factory suspension handle the added weight so you keep control and comfort even when the load gets serious.

Smooth the Bumps and Shocks: Progressive Load Control

Every road throws something different at you, and these springs adapt to it. The microcellular urethane compresses easily at first for a softer ride when lightly loaded, then firms up as the weight increases. That progressive load control keeps the truck comfortable when empty and stable when fully loaded, cutting down bounce and harsh jolts over rough pavement.

Side-by-side comparison showing SumoSprings installed on a rear axle, with one spring uncompressed and the other compressed under load to demonstrate load-leveling performance.

Stay Steady in Crosswinds and Turns: Independent Spring Action

When a curve or side wind tries to push you around, each spring works on its own to keep that side planted. This independent action helps reduce body roll and sway so the vehicle feels more stable through corners or uneven ground. It also helps even out off-center loads so you can tow or haul with more confidence.

Built Tough for Real-World Conditions: Durable Microcellular Urethane

These springs are made from microcellular urethane that resists abrasion, oil, salt, and UV damage. They hold up in temperatures from -25 F to 200 F and compress vertically instead of sideways, so they won’t get damaged by nearby parts. With no air lines or pressure to monitor, they’re completely maintenance-free once installed.

Simple Installation That Fits Right: No Drilling Needed

Getting better suspension support shouldn’t require a shop visit. These custom-fit SumoSprings bolt on easily with no drilling required. Two jounce-style springs come in the kit ready to mount, giving you a quick way to level out your ride and keep it stable under load without extra hardware or adjustments.

Specs

Weight and Capacity

  • Weight capacity (at 50-percent compression): 1,400 lbs

Warranty

  • Limited lifetime warranty
  • 30-Day satisfaction guarantee

SSR-629-40 SuperSprings Sumo Springs Solo Rear Vehicle Suspension Kit

Installation Details SS85NV Installation instructions

This Product Fits The Following Vehicles




Video of SumoSprings Solo Custom Helper Springs - Rear Axle
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Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.




Video Transcript for Review of SuperSprings Intl Vehicle Suspension - SumoSprings Rear Axle Solo Helper Springs - SS85NV

Hi, everybody. Andy here with etrailer.com. Let's take a real quick look at the SumoSprings rear-axle solo custom helper springs. Now, these have been designed to fit your 2008 to 2021 Toyota Land Cruiser and Lexus LX 570. And on custom-fit parts, such as these helper springs, I do recommend taking advantage of our "Vehicle Fit Guide" here at etrailer.com. Simply input the year, make and model of your vehicle, and our fit guide will confirm if these will work for you or if we have something comparable that will work for you.

Now, as you know, towing or hauling a heavy load can cause your rear to sag as your factory suspension compresses under the weight of that load. And this means that your rear axle is trying to support not only the extra load, but also the weight of your vehicle. And because there is less weight on the front axle, your front tires may make less contact with the road, which is going to cause problems with traction, steering, braking. So these SumoSprings are going to help upgrade your vehicle's factory suspension to help level your vehicle, improving driving performance and keeping your ride more comfortable. These 1,400-pound-capacity helper springs are going to help provide progressive load support.

So the more that you load them, the stiffer they become. With the lighter load, the springs will compress easily for soft engagement and a less bumpy ride. The closed cell urethane material is going to allow for smooth contact between the springs and your vehicle. And the springs act like a shock absorber to dampen road vibration. Now, the springs can also compress by as much as 80% to support a rear heavy load and to help your factory suspension bear up under that load.

This means that it's going to even out the weight, which levels your vehicle and ensures that your front tires are making better contact with the road. So as you know, a level ride means that you have improved driving control. It's going to make sure that you have even safe headlight aim, it's gonna help minimize sway. And so these springs are going to help support your factory suspension, which is going to help prevent that sagging and reduce bottoming out. Now, these springs are gonna work independently from one another to support each side of your vehicle.

This action's gonna help reduce body roll when you make a sharp turn. This also helps compensate for off-center loads. These microcellular urethane springs are tough, they are going to resist abrasion, oil, salt and UV rays that can more quickly wear out other springs. And they're gonna perform well in temperatures ranging from negative 25 degrees all the way up to 200 degrees Fahrenheit. So SumoSprings compress vertically with minimum expansion to the sides. So what that means for you is they won't be damaged by nearby mechanical parts and they fit safely into tighter spots. And unlike air springs, these SumoSprings require no maintenance or adjustment. These jounce-style springs are made here in the USA and are custom designed for your vehicle. They're gonna install easily, no drilling required. As you can see, I do have them slightly, or loosely rather, put together. You're gonna get these two spacers, and then the two brackets that are going to fit your Land Cruiser or LX 570. I mentioned that the weight capacity is 1,400 pounds, so at 50% compression, 1,400 pounds, but SumoSprings do not actually increase your vehicle's weight carrying capacity, so you wanna make sure that you don't exceed your manufacturer's recommended weight limit. These do have a limited lifetime warranty from SumoSprings. And you will get an instruction sheet to guide you through the easy installation. Well, I think that's gonna wrap up our quick look today. I do hope that it was helpful for you. Again, my name is Andy. Thank you for joining me.

Ratings & Reviews

4.7

2544 reviews
5 Stars
(2057)
4 Stars
(331)
3 Stars
(54)
2 Stars
(38)
1 Star
(64)
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by:
2013 Jeep Wrangler Unlimited
I put these on a 2013 Jeep JK (not lifted) that tows a 3000 lb trailer in rough terrain; Total game changer.

These replaced the anemic factory stops (which had completely disintegrated) and make it impossible to 'bottom out' on the dips and holes that use to beat up the suspension. I got nearly all of my vertical travel back and the vehicle now sits almost level under high tongue load.

They go on pretty easy. I suggest sliding in one side, and then using a wooden dowel and hammer to pop the other side in the stock receiver cup.

Highly recommended. These are a MUST if you are towing a trailer (with a medium sized SUV) of any significant weight or if you just want to be able to bounce hard without bottoming out your suspension. I am likely going to get the front suspension version now as well.
Wish I knew these existed sooner.
Heather A. profile picture
Etrailer Expert

Heather A.

8/12/2026

Wow thank you for the glowing review Randall. It sounds like once you got them installed they are working out great. That sunset is gorgeous, where were you in this photo?

Randall profile picture

Randall

8/12/2026

@HeatherA This photo was taken in South West Colorado @ about 10,000 ft.
by:
2025 Promaster 2500 159” wheelbase. Backed the van on couple 2” X 6 “ easier sliding under. Sprayed PB Blaster on top of bumper spring, using a 16” Channel Lock, easy off with the old. At that time I jacked the rear end to allow clearance. One side at a time. Took longer for set up then the job. I used the long bolt with two spacers. Have not drove yet, though looking for great results.
Lazer S. profile picture
Etrailer Expert

Lazer S.

5/13/2026

Glad to hear the install wasn't too bad, Michael! Definitely let us know how the ride is once you take it out for a drive! What are you using your Van for? The tires look pretty beefy.

by:
2020 Jeep Gladiator
This only pertains to the order, shipping speed, and install as I have not put a heavy load on these sumo Springs yet but I feel like that's a foregone conclusion based off the reviews already. The ordering process, the shipping, and the installation was unbelievably easy. I kept rereading the instructions thinking this can't be right because it was so simple. I looked at the YouTube video and realized it is that simple! So happy with the ordering process, the quality of the initial product I opened, and how simple it was to put on the jeep.
Claire H. profile picture
Etrailer Expert

Claire H.

9/1/2026

That is the beauty of SumoSprings! Super easy to install and once they're on you can forget they're there! Are you planning on towing something with your Jeep that you want extra support for?

Justin profile picture

Justin

9/1/2026

@ClaireH yes Ms Claire. I plan to put a truck camper on the Jeep (that weighs in the 500-1000 lbs range). My payload is 1700 lbs so I know a camper of the weight will be significant my truck. Already ordered a stiffer rear anti-sway bar as well.
Claire H. profile picture
Etrailer Expert

Claire H.

9/2/2026

@Justin That sounds like a good plan! These SumoSprings plus the sway bar should be more than enough to handle the weight of your truck bed camper.
by:
2022 Ford F-150
Love them! The truck barely even squatted, had two dirt bikes, and a generator in the bed as well! It handles the bumps and sway great
Gwendolyn Y. profile picture
Etrailer Expert

Gwendolyn Y.

5/20/2026

Looks like you were about to head off somewhere fun, Chad!

by:
Product is great, exceeded my expectations. Install is simple and straightforward. It’s a night and day difference in both the body roll and the handling small bumps all the way up to off-road conditions.
Christopher H. profile picture
Etrailer Expert

Christopher H.

8/4/2026

Happy to hear the # SSR-118-54 was a simple install and is working well for you. This is a great system!

by:
Put these on a Jeep Gladiator to haul a motorcycle to Sturgis. Kept everything level, good ride and stability. Highly recommend.
by:
2016 Toyota Tundra
It arrived pretty promptly about 30 minutes later I had him installed. It took me longer to find the proper Tools. Never had to remove the tires or wheels the only time I had to jack it up was to put the helper springs and screw them down very easily install
by:
2000 Nissan Leaf
Great product! Bought these for my 2000 7.3 f250. Didn't want something that is constantly active like ras or hellwig since my leaf springs are new and rated for 4k pounds. Installed these in 1 hr super simple only hard part was the factory bump stop on driver side was a pain. Didn't install the puck they give due to height of truck and I knew more or less at what point I wanted them engaging. I haul cattle to shows/ auctions or between pastures with my 24ft big bend and these things actually provided a smoother ride in my truck loaded then unloaded.they do a great job with the added support and are better than an overload spring with handling sway and providing a smooth ride loaded. Just wish I could use the 3k pound rated ones on this truck and my dually but doesn't fit if you have a gooseneck sadly so will probably have to go with timbs on the drw. Over all great product can't speak to longevity but solid for the time being. And customer service with this company is excellent if you have a question or problem they're on top of it...hope they pay them as well as the reputation they're building for them.
by:
Very easy installation. The improvement in handling is phenomenal.
Gwendolyn Y. profile picture
Etrailer Expert

Gwendolyn Y.

4/23/2026

Thanks for the awesome feedback, Jeff! Love hearing that the install was a breeze and that you noticed such a big difference in handling, that’s exactly what you want after the upgrade. Really appreciate you sharing the photos too, it’s always fun to see the comparison.

by:
2024 Chevrolet Silverado 1500
I put a set of 47s on my Silverado 1500 and towed my dump trailer that weighed 6000 pounds the way I had it loaded for 50 miles on all kinds of roads and it worked well. I didn’t use the spacers and the truck still rides like it did before the install.
Gwendolyn Y. profile picture
Etrailer Expert

Gwendolyn Y.

1/8/2026

Glad the Sumos are helping make your loads easier to tow!

by:
Jeep Gladiator Mojave - swapped out the rear stock bump stops with these. High quality parts. Just jack up the truck enough to give you room to work with and put in your jack stands, no need to remove the wheels. I look forward to seeing how they do with towing! Hopefully I can update my review here afterwards. Check out the gap difference in the pictures. Should touch sooner during normal drive conditions and hopefully help reduce some trailer squat and help towing to be smoother.
by:
Opted for the Blue 1000lb Sumo's w/spacer over the 1500lb Black ones. 1500 Silverado Max Tow & reduces squatting by 2" on a 1000lb+ tongue weight. Ride is still good, but you can feel the Sumo's engage over large dips or bumps which is not an issue for me.
Richard profile picture

Richard

2/12/2026

No issues. Towed a 27 Airstream around 4k miles &amp its all good.

Lazer S. profile picture
Etrailer Expert

Lazer S.

2/12/2026

@Richard Nice! Glad you are still happy with them! Was that all one trip, or multiple different trips?
by:
I got the springs installed last week and wanted to have a drive time before I wrote the review.

The height of the springs are perfect for my 2016 Tacoma, They keep the truck stable and nearly eliminate the body roll I had before installing them. I am heading to the mountains in a couple weeks, so I will update the review when I get back. That way I will know for sure the body roll is gone and the truck is stable on the winding mountain roads.

The springs installed in no time at all and since I had the rear end apart, I decided to add the leveling blocks at the same time, to keep the truck from squatting with the gear I haul around with me.

The guys at etrailer are great. And while I did not call them to discuss this item, they have been very helpful in the past with all my questions.

Below are pictures of before, a couple comparisons and after. Sorry if they come out sideways.

These Sumo Springs were a great addition to my Tacoma and well worth the money, IMHO.
Mike profile picture

Mike

7/31/2025

The springs are working exactly as expect. I have need up to the mountains numerous times and to Monerary to the Sea Otter bike fest. They have reduced the body roll and helped keep the truck stable on the mountain roads or when loaded down for camping. Im very pleased I added these Sumo Springs to my Tacoma.

Jon G. profile picture
Etrailer Expert

Jon G.

7/31/2025

@Mike We LOVE to hear reports like this! I've never been to the Sea Otter bike fest, but I looked it up online and it looks pretty cool! How many times have you gone to it?
by:
2016 Chevrolet Silverado 1500
Have Nissan NV 1500 (transit van).Loads and trailers were the problem-along with the constant "slouch" look-with no really heavy load on it. Hated that!
These used with "add-on leaf springs" made a world of difference.
Bumps being felt, are there, but nothing like before. These two things along with new shocks (all for back),has helped out so much!
So, the bumps have almost faded to "nothingness". Now granted, I have not hit a massive pothole, yet. I try to dodge those anyhow!
Components work great together!
by:
Got them installed no issues the reason for 4 stars is one side touches top of axle the other side does not no one could tell me if this was right or wrong also haven't pulled 5th wheel yet to feel the ride or handling so we will see thanks
by:
2024 Ford F-250 Super Duty
Definitely helps with squat on '24 F250 from boat trailer tongue weight. These do come with a plate to avoid uneven contact or wear.
I mounted using all spacers , stock is same unless speed bumps or large dips, u feel the stiffness/contact of sumo as expected. May take one spacer out .
Super easy to install , better than leaking bags.
Time will tell how they last
Lazer S. profile picture
Etrailer Expert

Lazer S.

9/16/2025

Glad to hear they are helping, Cory! If you are feeling them going over speed bumps, I think taking one of the spacers out is a good idea. Especially if that is happening when you are unloaded. Speaking of which, what are you towing?

Cory S. profile picture

Cory S.

9/19/2025

@LazerS 30' center consol 12,5k lbs on a dual axel trailer.
Lazer S. profile picture
Etrailer Expert

Lazer S.

9/23/2025

@CoryS Nice! I've been on a couple center console boats that moved faster than they probably should have! Grew up on and around boats in San Diego. There were some very "iffy" things done to make them faster. : P
by:
2021 Nissan Titan
I had installed this model SumoSpring on my 2019 4Runner and had great results when towing the camper I had at the time. They greatly reduce the bounce when going over dips in the road at highway speeds. Now I have a 2021 Titan and a bigger heavier camper. I expect the same great results on the Titan. Installation was pretty straight forward and took about a half hour. The size difference between the OEM bump stops and the SumoSprings alone should give a better ride when towing my camper.
Albert profile picture

Albert

7/16/2025

Still working like new. So much better than the factory bump stop.

by:
I bought a 2027 RAM 1500 to tow my 20' 5000lb Forest River. Easy to install. I did it in my driveway in 1.5hrs. Some of the bolts were dificult to access due to mufflers etc but a short wrench worked well. When I first hooked up my trailer I had 4" of rear bed setelment. With springs installed I had less than 2". Front lift is about 1/2". Did not compromise driving comfort and appeared to dampen trailer "flex" on RxR tracks etc. My right handled very well on a trip from S Florida to N Georgia on Interstates and secondary roads.
Andrew N. profile picture
Etrailer Expert

Andrew N.

10/21/2026

Hey John, thanks so much for the detailed response and photos. That really helps other folks on the page. I'm glad install went well and you're liking them! I have these sumosprings on my Nissan Titan and it's a huge upgrade for towing!

by:
Easy to install and immediately noticed an improvement in ride stability and towing with my Gladiator. If only I had found these sooner.
by:
2020 Ford Ranger
Had them installed and hooked up the trailer. Much improved support from sag due to tongue weight. Kept the vehicle very level to within 3/4" higher than front. Perfect rake and comfortable during unloaded or loaded driving. OEM bump stops really didn't do anything in comparison. Shop had to work a bit harder to get OEM stops off but install of these SomoSprinhs was simple. Glad I went this route.
by:
I had the SumoSprings Solo Custom Helper Springs installed on my 2020 Nissan NV2500 camper van (rear axil) about 4 months ago and have been very happy with how they have performed.
by:
Installed these right before a long road trip, and were impressed with how much the ride improved. Opted not to include the spacers, which has worked out fine. While not towing have not noticed any change to the ride, which is good. When towing the steering has a solid grip on the road now (sometimes felt a little loose before installing these) and no more issues with 'porpoising'. We drove across a several mile long bridge in the Bay Area that likely would have been a roller coaster ride previously, and had no issues. Quick and easy to install.
Kate F. profile picture
Etrailer Expert

Kate F.

7/21/2026

One of my favorite things to recommend Kevin, the feedback is always so great on what a difference they make! What are you mainly towing that needed the extra support?

by:
I bought and installed the 1000lb Sumo Solo springs to help alleviate rear end squat on my 2024 GMC Canyon Denali when pulling my boat. My boat trailer has a long mono tongue with no weight distribution installed. The boat weighs in at about 5500lbs, the truck fender lip measures 38” high unloaded, once I dropped the hitch down on the ball and the Sumos picked up the load, the fenders measured 36.25” equating to an inch and 3/4 squat. Empty the Sumos have an apx gap of 7/8” above the frame rails. The Sumos were recommended over the Timbrens for my situation of infrequent towing with this truck and to maintain the best ride possible when not towing. So far my ride is virtually unchanged when empty and feels controlled when towing. Installation is straight forward but the instructions could be a little clearer with a diagram showing the intended location of the springs. Luckily an etrailer customer had already done the install and provided some pics so there was no question. I chose to remove the tires to have good access and I’d do it again this way. I supported the truck with a jack stand under the receiver. IMHO the proper method to locate the over frame upper clamp brackets is to push the forward clamp as far forward until it contacts the bed stiffener and you’ll be in the correct location then let all the hardware hang to position itself, tighten as required and enjoy.
Mike B. profile picture

Mike B.

4/24/2025

Excellent, I also tow a 6x12 cargo trailer which the Sumos do a great job of maintaining a level ride. I also installed Sumos front and rear on my 32 Tiffin motorhome. It utilizes the Ford F53 chassis and I believe they compliment that chassis well. Im definitely a big Sumo fan.

by:
Chevrolet Silverado
I was surprised at how much of a difference these actually make. I bought them based on some videos of others using them, but wasn't sure if they would actually make much difference in my situation. I tow a 6800lb trailer with a Silverado 1500. With the tongue weight of that trailer, the rear of the truck doesn't drop all that much and I wasn't sure if replacing the bump stops was even necessary, but when I'm on roads with "heaves" and especially bridges where porpoising can be a problem, these SumoSpring certainly help. You probably won't notice some huge drastic change, but it's just enough to matter and even out the ride to a noticeable degree. Also, they're pretty easy to install (and I'm only barely handy when it comes to this stuff.)
Gwendolyn Y. profile picture
Etrailer Expert

Gwendolyn Y.

5/16/2025

I'm glad that the Sumos helped with the handling, David! And I think your pretty handy if you can get these installed :)

by:
2026 Nissan Frontier
I've never put on a easier product. I put the jack under the trailer hitch mount. Just lifted the body 1-2 inches and used a 12 mm socket . The socket removed the old ones and I hand tightened the new on. Literally took 10 minutes and a beer.
Claire H. profile picture
Etrailer Expert

Claire H.

7/6/2026

That's the beauty of SumoSprings, easy to install and once they're on you can forget about them and let them do their job!

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