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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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2010 Kia Forte Koup
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SuperSprings Intl

SumoSprings Solo Custom Helper Springs - Rear Axle

Part Number: SSR-306-47
In Stock
$319.99
Vehicle Suspension
Not Confirmed to Fit

2010 Kia Forte Koup

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1,500-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 SSR-306-47 can be ordered online at etrailer.com or call 1-800-940-8924 for expert service.
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  • Reviews (2546)
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  • Videos (3)
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SuperSprings Intl Vehicle Suspension - SSR-306-47

Highlights

  • Custom Fit for Your Vehicle: Mounts to existing attachment points
  • 1,500-lb Load Support: Levels your ride and limits sag so steering and braking stay steady.
  • Smoother Ride Over Bumps: Microcellular urethane cushions impacts and reduces harsh jolts.
  • Handles Uneven Loads: Each spring works independently to balance off-center cargo and cut body roll.
  • Zero Maintenance Required: No air lines or pressure checks—just install and drive worry-free.
  • Simple No-Drill Install: Mounts in place of factory bump stops using basic hand tools.
Made in USA

Features to know about

Stay Level and in Control Under Load: 1,500-lb Rear Suspension Support

When you hook up a trailer or load down the bed, weight on the rear axle can make your ride sag and steering feel light. These SumoSprings Solo helper springs deliver up to 1,500 lbs of support at 50-percent compression to keep your vehicle level and steady. They help your factory suspension handle the extra weight so your steering, braking, and headlight aim stay right where they should.

Smooth Ride on Every Trip: Progressive Load Control

Not every haul weighs the same, and that’s where the progressive load control design shines. With a light load, the springs compress easily for a soft, comfortable ride. As the load gets heavier, they firm up—compressing by as much as 80 percent—to give solid support and prevent bottoming out. The result is a smooth transition from daily driving to full towing duty without harshness or bounce.

Comparison image showing SumoSprings Solo helper springs installed on a vehicle rear axle in uncompressed and compressed states to illustrate load support and suspension improvement.

Stay Steady in Crosswinds and Turns: Independent Spring Action

When a curve or uneven load tries to throw off your balance, each spring works on its own to keep your ride planted. This independent action helps reduce body roll and sway so you stay steady through corners, crosswinds, and rough approaches. It’s the kind of control that makes towing and hauling feel more confident.

Built Tough for Real-World Conditions: Durable Microcellular Urethane

Long hauls and tough weather can wear down ordinary parts, but these microcellular urethane springs are made to last. They resist damage from oil, road salt, and UV rays, and they perform in temperatures ranging from -25 F to 200 F. Their vertical compression design keeps them safe in tight spaces without rubbing against nearby parts.

Quick Install and Maintenance-Free Use: No Drilling or Air Lines

Adding load support shouldn’t mean adding hassle. These jounce-style springs mount in place of the factory bump stops with a simple, no-drill installation—no tubing to run or air pressure to monitor. Once installed, they’re maintenance-free and ready whenever you need them for towing or heavy hauls.

Specs

Weight and Capacity

  • Weight capacity (at 50-percent compression): 1,500 lbs

Warranty

  • Limited Lifetime warranty
  • 30-Day satisfaction guarantee

SSR-306-47 SuperSprings Sumo Springs Solo Rear Vehicle Suspension Kit for Trucks

Installation Details SSR-306-47 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 All About the SumoSprings Solo Custom Helper Springs-SS28UV

Hi, everyone, Aiden here with etrailer. Today we're gonna be taking a look at the SumoSprings solo line of custom helper springs. This is gonna come in a variety of different fits, and have different styles of spring. So let's check them out and talk about the differences. Now right away, this is going to be for the rear axle. You can see we've got one installed on our 4Runner today.

That's just one of many fits available, and it's a direct bolt on installation. Now with the rear axle, it's gonna help with a number of things. In any sort of towing applications where we've got a lot of tongue weight on the hitch, bringing the back end down, and the front end of the vehicle up, it's going to help return us to a more normal ride height. Now, unlike an airbag that's adjustable where you can tailor it to each load independently, this is going to be pretty much fixed, but it will provide a lot more support, especially compared to the factory bump stops. Now, this is just an example, because every vehicle fit's gonna be a little bit different, but just the overall height difference between the factory and the SumoSprings option is going to be pretty drastic.

So with these being so much larger, they're going to make contact with the axle a lot quicker, so we get quicker engagement and support. So we don't have all of this open air between the bump stop and the axle, where if we hit a bump with a heavy load, we feel all of this bouncing, or side to side, we don't feel as much sway, because this may contact a lot quicker, and provides that support when we need it. And with the SumoSprings, there are gonna be multiple different kinds. If you're looking at different options, you'll see a blue, a yellow, and a black one, and they are different. They really differ in the density.

Overall function and fit, it's gonna be pretty much the same. For example, on the 4Runner here, one of these black ones is available, but also a blue one. It's gonna be the same fit, but they offer different support. The blue one is going to be the lightest density, the black one is the medium density, and the yellow is the most extreme heavy density. That just means as you get more dense, it provides more support, and all of the weight capacities, depending on the kits, will vary a little bit, but as a general rule of thumb, you can go by that color scheme to find out whether you need the light, medium, or heavy duty option.

Now these feature a progressive spring rate, and what that means is the more they compress, the more they're going to push back and support, and try to bring the vehicle back to its normal driving position. So the initial first bit of compression is going to be a bit softer and easier to move. So for normal day-to-day driving when you have these installed, it isn't going to be as stiff. Then as we get into heavy loads and we start getting pretty extreme compression, it's going to work harder to push back to that normal state, and bring us back to a comfortable driving position. Now as far as the construction goes, it's going to be a microcellular urethane material, as opposed to something like a rubber material. Now the urethane's gonna be very heavy duty. It's gonna work in temperatures from negative 25 degrees Fahrenheit, all the way up to 200 degrees Fahrenheit. So you can expect it to work in all sorts of weather conditions. And this material is going to resist all kinds of oil, road salt, and UV rays. So if it does make contact with the sun, it's not going to weather away, and any sort of road conditions, like road salt in the winter, isn't going to cause this to degrade over time. So whether you're looking for support side to side and limiting body roll in your vehicle, or you're looking for backend support for towing, or maybe just something heavy in the hitch like a cargo carrier, this is going to be a great way to do that. It's a maintenance-free solution, so you don't have to worry about maintaining air pressure in it like an airbag, although you don't get as much adjustability with it. I do think that trade-off is very much worth it, because once it's installed, you don't have to worry about it. The installation process is obviously going to vary depending on what kit you get, so do be sure to use our vehicle fit guide on our website to find the right kit for you and your vehicle. But that'll do it for our Look at This medium density SumoSprings solo line of air helper springs here at etrailer. Thanks for watching.

Ratings & Reviews

4.7

2546 reviews
5 Stars
(2059)
4 Stars
(331)
3 Stars
(54)
2 Stars
(38)
1 Star
(64)
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by:
They definitely do their job when the trailer is attached however, there is no flex at all when hitting bumps in the road, and when the truck is without trailer, it is a rougher ride. I think I would’ve preferred airbags.
by:
Just what I wanted without all the moving parts to cause problems later.
by:
2004 Dodge Ram Pickup
Used them for the first time towing our new travel trailer and was really impressed with how much they helped with the sag would definitely recommend to anyone with a 1500 and is towing a trailer
by:
Dodge Ram Pickup
These have done a great job of keeping our Ram 1500 level while pulling a trailer and having a load in the bed. No more scraping the hitch while going through dips or over bumps! The ride still feels solid.
Tim F. profile picture

Tim F.

12/1/2023

Still working great, after a lot of driving!

by:
These do not fit a 2006 ram 2500. As you can see in the
Photo the bolt holes are WAY off
. It also does not sit over the axle tube. My only option at this point to use them is to make a 2nd bracket to bolt the helper too. Very disappointed.
Jenny N. profile picture
Etrailer Expert

Jenny N.

10/19/2023

Before you take that step, I have the solution for you. These springs are meant to be used on a 2006 Dodge 1500. The SumoSprings Solo springs for a 2006 Dodge 2500 are part # SSR-302-54. Visually they look to line up better with the original bump stop measurements. I will have our Customer Service team reach out to you to discuss return options.

by:
2008 Dodge Ram Pickup
4 stars cause i havent got to tow with them on yet definitely know they are on witbout having a trailer on so far so good.
by:
Good Product. Easy to Install. Order arrived in two weeks. Customer service/support after the sale left something to be desired.
by:
2007 Dodge Ram Pickup
Paid the extra $5.00 in freight and it was worth it. Received on the date expected in great packaging and installation was fairly straight forward.
by:
2003 Dodge Ram Pickup
Easy to install. They work great for my application.
by:
2008 Dodge Ram Pickup
I had to drill my holes on the springs they didn't match up as told on the site . That much money should not had to modify them but I did .
Katrina B. profile picture
Etrailer Expert

Katrina B.

8/24/2022

I apologize for these not lining up properly for you. I have sent this information over to our customer service department for them to look into this situation for you.

by:
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!
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See what our Experts say about this SuperSprings Intl Vehicle Suspension

  • How Long is the SuperSprings SSR-306-47 for 2008 Ram 1500
    There are a lot of different models of the SuperSprings Custom Solo Helper Springs that are available for different Ram pickups, but assuming you've got a 1500 the correct SuperSpring Custom Solo Helper Spring is part # SSR-306-47. That particular spring is 7-1/4" including bracket and is designed to replace your factory bump stop on the rear axle. If you were looking for a different part number, just let me know and I can give you the dimension you're seeking.
    view full answer...
    Image 1 for
  • Height Of SumoSprings Solo Springs # SSR-306-47 For a 2002-2008 Dodge Ram 1500
    The SumoSprings Solo Custom Helper Springs # SSR-306-47 are designed for the height and travel of the suspension on your 2002-2008 Dodge Ram 1500. First I recommend checking the height of your Ram from the bump stop mount to the axle pad. These SumoSprings are 7-1/4" tall and if that matches the height of your bracket to the pad they will fit without a spacer. If you were to use a spacer it may damage the assembly by restricting the maximum amount of travel of this spring.
    view full answer...
    Image 1 for
  • Recommended Fifth Wheel Hitch For A 2006 Dodge Ram 1500 Thunder Road Edition
    When it comes to capacities it's best to only use 80-85% of the total capacity to avoid any potential damage. If you're getting to close to the limit there's going to be more wear and tear on your truck's suspension and engine/transmission. There are components you can add in to help the truck's performance but you won't be able to add capacity. A transmission cooler like the Derale Series 8000 Plate-Fin Transmission Cooler Kit w/Barb Inlets # D13504 can be installed to help protect and...
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  • What Tire Chains do You Recommend for My 2005 Dodge Ram with 265/70-17 Tires?
    For a great set of tire chains on your 265/70-17 tires on your 2005 Dodge Ram, I recommend the Titan Chain Snow Tire Chains w/ Cams - Ladder Pattern - V-Bar Link # TC2828CAM. Not only do these chains come with cam tighteners that help with getting an optimized fit, the V-bar links are a great addition. With the V-bars, the chains penetrate the snow deeper than non V-bar models to give you superior traction. As with all tire chains, since these chains measure 5.5mm thick, I recommend measuring...
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