bing tracking image
  1. Vehicle Suspension
  2. SuperSprings Intl
  3. Jounce-Style Springs
  4. Rear Axle Suspension Enhancement
  5. Light Duty
SumoSprings Solo Custom Helper Springs - Rear Axle

SumoSprings Solo Custom Helper Springs - Rear Axle

Item # SSR-313-40
lowest price pledge
Retail:$281.35
Our Price: $249.99
You Save: $31.36
Vehicle Suspension

Will this fit?

To see if this custom-fit item will work for you please tell us what vehicle you'll use it with.

This item qualifies for Free Shipping
Shipping Weight: 4 lbs
Quantity: 
In Stock
zoom in icon
slider vertical icon
zoom out icon
Comment field cannot be left empty.
Name field cannot be left empty.

Thank you! Your comment has been submitted successfully. You should be able to view your question/comment here within a few days.

Error submitting comment. Please try again momentarily.

Product Images

Customer Photos

Need help with installation?
Locate installers near me
1,000-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. Lowest Prices for the best vehicle suspension from SuperSprings Intl. SumoSprings Solo Custom Helper Springs - Rear Axle part number SSR-313-40 can be ordered online at etrailer.com or call 800-298-1624 for expert service.
  • All Info
  • Reviews (1332)
  • Q & A (0)
  • Videos (2)
  • Photos
  • Why etrailer?

SuperSprings Intl Vehicle Suspension - SSR-313-40

  • Jounce-Style Springs
  • Rear Axle Suspension Enhancement
  • SuperSprings Intl
  • Light Duty

1,000-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.


Features:

  • Helper springs upgrade your vehicle's rear suspension for improved driver control and comfort
    • Keep your vehicle level when you're towing or hauling a heavy load
    • Help to absorb bumps and shocks
    • Minimize sway
  • Progressive load control - springs compress according to the weight of your cargo
    • Lighter loads - springs compress easily at first for soft engagement and a less bumpy ride
    • Heavier loads - springs compress by as much as 80 percent for support
  • Springs work independently from each other to compensate for off-center loads and reduce body roll during sharp turns
  • Durable microcellular urethane
    • Works in temperatures from -25 F to 200 F
    • Resists damage caused by oils, road salts, and UV rays
  • Minimal lateral expansion - springs compress vertically instead of to the sides so they aren't easily damaged when operating in tight spaces
  • Maintenance-free - no tubing to run or air pressure to monitor like with air springs
  • Simple, no-drill installation
  • 2 Jounce-style springs included
  • Made in the USA


Specs:

  • Weight capacity (at 50-percent compression): 1,000 lbs
    • SumoSprings will not increase your vehicle's weight-carrying capacity
  • Limited lifetime warranty
  • 30-Day satisfaction guarantee


Rear Suspension Support

Towing or hauling a heavy load can cause rear sag as your factory suspension compresses under the weight of the load. This means that the 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 your front axle, your front tires make less contact with the road, which causes problems with traction, steering, and braking. SumoSprings upgrade your vehicle's factory suspension to level your vehicle, improve driving performance, and keep your ride comfortable.


Installed spring when it is not compressed

SumoSprings provide progressive load control - the more you load them, the stiffer they become. With a lighter load, the springs will compress easily for soft engagement and a less bumpy ride. The closed-cell urethane material allows for smooth contact between the springs and your vehicle. And the springs act like a shock absorber to dampen road vibration.


Installed spring when it is compressed

The springs can also compress by as much as 80 percent to support a heavy rear load and to help your factory suspension bear up under the load. This evens out the weight, which levels your vehicle and ensures that your front tires are making better contact with the road. A level ride means that you have improved driving control, ensures safe headlight aim, and helps to minimize sway. The springs also support your factory suspension, which helps prevent sagging and reduces bottoming out.


The springs work independently from one another to support each side of your vehicle. This action helps to reduce body roll when you make a sharp turn. This also helps compensate for an off-center load.


Durable, Custom-Fit Springs

These microcellular urethane springs are tough. They resist abrasion, oil, salt, and UV rays that can more quickly wear out other springs, and they perform well in temperatures ranging from -25 F to 200 F (-33 C to 93 C).


SumoSprings compress vertically with minimum expansion to the sides, so they won't be damaged by nearby mechanical parts and they fit safely into tighter spots. And unlike air springs, SumoSprings require no maintenance or adjustment.


The helper springs are custom designed to fit your vehicle, and they install easily - no drilling required.



SSR-313-40 SuperSprings Sumo Springs Solo Rear Vehicle Suspension Kit for Vans

Replaces SSR-308-40

Installation Details SSR-313-40 Installation instructions

This Product Fits The Following Vehicles




Video of SumoSprings Solo Custom Helper Springs - Rear Axle

Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.




Video Transcript for SumoSprings Solo Custom Helper Springs Review

Speaker 1: Today, we'll be taking a look at the SumoSprings Solo Line of Custom Helper Springs for the rear axle. You'll want to use eTrailer's fit guide to determine the correct kit for your vehicle. This is what our SumoSprings look like when installed. Yours may look a little different depending on your vehicle.They're gonna replace our factory jounce stops and sit right between our frame and our rear axle. So whenever we're carrying a heavy load, they're gonna give us that extra support that we need. The way our SumoSprings are gonna work is when our suspension starts to sag from the heavy load, these are gonna absorb a lot of that weight.They are gonna work independently from each other so it's gonna help with those off-center loads.

Our springs are gonna have a progressive rate to 'em. So if we have a light load, they're gonna compress softly, still giving us that comfortable ride. But the heavier load we put on 'em, the more they're gonna compress and the more firmness they're gonna have to them.Now comparing to our factory jounce stop, you can see there's a big difference in height. These are gonna give us a lot more compression, whereas our factory jounce stops are really just preventing the axle from hitting the frame.We have a water tank at the bed of our truck as a heavy load or to simulate the tongue weight of a heavy trailer or a fifth wheel. So as I take the truck through my test course, I can definitely tell that there's a load back there.

The engine doesn't seem to be strained that much, but the bumps are extremely harsh and I can definitely feel it resonating through the seat.When I come to the slalom course and I'm going through the turns, it definitely has a lot of body roll and I just generally feel like I need to slow down because it feels likes it's leaning a lot and it's not responding quickly enough to the turns.Now that we have our SumoSprings installed and I have the same load back there, when I'm driving through our course, I can immediately tell a difference. It's much of a smoother ride. Going over the bumps really doesn't feel like anything's back there and it's just a lot more comfortable.When I come into the slalom course, it definitely feels a lot more stable and it doesn't seem to sway as much side to side and it just generally feels like it wants to go faster.These are made of a durable micro cellular urethane that works in temperatures from -25 degrees to 200 degrees Fahrenheit, and resists damage caused by oils, road salts and UV rays. Compared to air bags, these are maintenance free option with no tubes to run or air pressure to maintain. Both will help level your load and provide a smoother ride.

Airbags can be adjusted to suit your needs whereas the SumoSprings are a fixed option.That completes our look at the SumoSprings Solo Line of Custom Helper Springs for the rear axle.


Customer Reviews

SumoSprings Solo Custom Helper Springs - Rear Axle - SSR-313-40

Average Customer Rating:  4.7 out of 5 stars   (1331 Customer Reviews)

1,000-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.

- SSR-313-40
by:



- SSR-610-47
by:

Review from a similar SumoSprings Solo in Vehicle Suspension


I would have give it a 5star but the bolts are 1/4” I think it should be at least minimum of 3/8” or1/2” bolts to hold the sumo springs. I like them toed the camper handles very well. Wishi got these a long time ago worth getting. With out camper can tell that it’s there but rides ok. I wanted the same ride it not quite. I ask what the how high they are said 5” with bracket but it’s actually 6” with bracket see picture. I would recommend getting the sumo springs ssr-610-47.


Comments
They are working great in my 12 tundra still would recommend them. I tow 8000lbs camper handles great at times I probably wished I got the next step up but might be to hard when not towing. Will see next time I need to get some for next truck. Wish they have measurements to know how high they are from the lighter ones to the heavier ones.
Luc - 04/18/2022


- SSR-610-54
by: 01/31/2021

Review from a similar SumoSprings Solo in Vehicle Suspension


2015 Frontier Crew cab Desert Runner (purchased the yellow Sumo Springs). Easiest install ever! 18mm deep socket and long breaker bar for breaking nuts loose. Removed factory bumpstop, install sumo bracket and retighten U bolts to 58 foot pounds. After installing both brackets, lifted back of truck up 4 inches to install sumo spring with blue lock tight on bracket bolt, tighten sumo spring onto bracket and lowered truck off the jack. Overall it raised the back of my truck bed 1 inch. Ride is stiffer with no bed roll in the turns. Loaded my 24 foot travel trailer with load leveler- equalizer bars and gained 3 inches (less “squat”.) Truck is level now vs nose high (without the sumo springs). Definitely an upgrade that was needed in 2015 when I first bought the truck!!!


Comments
Yellow for the super heavy load and daily driving I have the black middle weight springs. Easy swap out when I need the yellow Heavy Duty.
Mike M - 02/01/2022


- SSR-312-54
by:

Review from a similar SumoSprings Solo in Vehicle Suspension


I just finished installing the Sumo Springs to my 2020 Ram 3500. The install was super easy. Instruction were easy to follow and the whole thing took less time than I thought. I won’t know how they perform until I pull the 5er out of storage this spring, but I am ready. My only question and the reason for 4 stars instead of 5 was I thought they would sit closer to the axle than they did, may 2” from axle and I would have liked may 1” maybe I could have used another spacer and longer flat head screw to bring it closer but we will see when I put the weight on the truck. I included picks if someone wants to give me their opinion. So far I am really happy with them.


Comments
Fantastic, the Sumo’s are working as promised. Helps with sag, smooths out the ride and provides support from sway. I couldn’t be more happy. This year we will be adding Sumo’s to the 5er to help in the back, super excited about this upgrade.
Brian - 01/31/2022


- SSR-610-54
by:

Review from a similar SumoSprings Solo in Vehicle Suspension


We pull an off-road teardrop camper with our 2013 Toyota Tacoma and were looking for a little help with the rear end sag when we have that hitched plus putting some weight in the back of the truck (firewood, water, etc). Our Tacoma is lifted (2.5") but the lift kept the stock springs with an added Deaver leaf to help with the notoriously soft Toyota springs. However, with the shell and ~300 pounds of weight in the back, it still sagged, especially with another 250 lbs of tongue weight from the trailer. The Sumos have eliminated that sag, even with bigger loads in the bed, eliminated body roll (also notoriously bad with Tacomas) and didn't destroy the ride for day to day driving. There might be a slight bit more stiffness when hitting speed bumps, but definitely not bad at all. If anything, I would say it IMPROVED the ride and handling. The springs themselves were simple to install, less than half an hour start to finish. Some reviews have said they were bumping the frame after installing but we had about 1/2" gap on both sides. The only "specialty" tool would be a torque wrench capable of 90 lbs to get it to spec. We considered Firestone air bags but after talking with the reps at e-trailer, we decided on these and couldn't be happier. Reasonably priced (half the price of air bags), no maintenance, great customer service...can't argue with anything at all.


Comments
One year and working better than I imagined it would. Carrying loads in my Tacoma is no longer an exercise in fear and my shocks are way happier happier with a little help!
Barry - 08/07/2021


- SSF-280-47
by:

Review from a similar SumoSprings Solo in Vehicle Suspension


2007 Workhorse W22 chassis, easy install, slight KJ knuckle busting on drivers side, but patience works.


Comments
Most Excellent, great ride
Bryan - 12/30/2021


- SSR-612-47
by:

Review from a similar SumoSprings Solo in Vehicle Suspension


Couldn’t have been a simpler install! Total time was less than 15 minutes which included digging the floor jack out, blocking the tires and cleanup. Makes a heck of a difference in keeping the nose of the truck up when towing trailer or hauling 16 golf cart batteries.


Comments
Still awesome. A year later, have hauled up to 16 golf cart batteries with no issues due to the weight. A real help in getting the work done without the fear of bottoming out.
EV T - 08/19/2021


- SSR-610-40
by:

Review from a similar SumoSprings Solo in Vehicle Suspension


Instructions were adequate. installer has to contribute to the outcome with bolt cleaning, match marking axle saddle and finding out "u" bolt torque value. I think the mount should be radiused where the "u" bolt contacts it as opposed to the square edge. Was unnecessary to jack up truck to get clearance to screw on spring, I put a wood between frame and leaf and raised the box 1/2" with a wedge. I got the ride height I was looking for, the blue springs are very close to offsetting trailer tounge weight allowing for a bit of takeup with my Andersen hitch. Barely noticeable change in unloaded rear end stiffness.



- SSR-307-47
by:

Review from a similar SumoSprings Solo in Vehicle Suspension


When installing the springs I discovered that one of the mounting plates (1 out of 4) had 2 of the holes missed drilled and was unable to install. I had to send back to etrailer.


Comments
Sorry to hear about this defect. I see in your account that the manufacturer has provided you with a new mounting plate.
-- Etrailer Expert Sierra K - 10/18/2021


- SSF-204-47
by:

Review from a similar SumoSprings Solo in Vehicle Suspension


First off, these won't fix worn out suspension components, they are designed to improve ride quality by reducing sag/porpoising, especially on heavier vehicles. Our 2010 Roadtrek 210P (75k miles) is a great rv but essentially a big heavy tub going down the road. Has the tendency to lean and wallow front to back. New shocks and all suspension is good, as mentioned make sure that stuff is all in good shape. Pics show the oem stops vs the SS stops. Big difference - you may assume ride gets harsh but not the case. The oem stops were very tired and didn't do much. The preload on the new SS stops is just about perfect - any weight changes are very progressive which takes the harshness out of the ride. I didn't really see any change to ride height either. Road manners are improved, there's a bit more resistance to lean, but the main difference is that the front end doesn't try to change height as readily with the back end. Not a big deal to install. Youbdont need to pull the wheels, just turn them side to side to get to the stops. Pop out the old stops and clean the retaining cups with a wire brush and some brake clean. I used syl-glyde on the new stops to help get them into place. I also used a crowbar under the stop to push it into the cup while making sure the 4 tabs captured the top of the stop. Final step was to lower the van and give it a drive, then check to ensure the fit was good. The key here is to clean the cup first and use a bit of lube on the new stop. Very pleased and I'll be installing SS on the back end soon. Yup, they're pricey but they are good quality with a limited lifetime warranty.



- SSR-612-40
by:

Review from a similar SumoSprings Solo in Vehicle Suspension


I have an ARE Overland camper shell on my 2019 Toyota Tacoma. Installed these to help with the over all ride especially over hard bumps. Sounded like I was hitting the bump stops hard. Installed and ride did improve for the back. Also less body roll. P.s. George J is the best! Always on it when it comes to getting parts out!.



- SSR-127-54
by:

Review from a similar SumoSprings Solo in Vehicle Suspension


Super easy to install, and is a perfect fitting, direct replacement of OEM hardware. Half an hour, and done. Don’t forget to torque fasteners properly, and use Type-E torque seal/mark, to do it like a pro.


Comments
Way better ride and control over the airbags with on board compressor. F250, Lance 825 For my application, yellow Sumo Springs are a superior product. And 110 the cost!
Paul - 12/23/2021


- SSR-114-54
by:

Review from a similar SumoSprings Solo in Vehicle Suspension


Not driven under load, but think it is the answer. I may have to remove the spacer. I had to have them installed, not as easy /smooth as their video portrays. The instructions do not advise as what it suppose to look like (for F350 SRW) . IE: barely touching the axel? Above the axle? The 2800 load was recommended, I will follow up after my RV trip. I want it to set level, but not ride stiff W/O a load.


Comments
You are going to want at least 1 inch of space between the bottom of the spring and the axle otherwise it will create a rough ride. I do recommend removing the spacer.
-- Etrailer Expert Sierra K - 09/30/2021


- SSF-106-47
by:

Review from a similar SumoSprings Solo in Vehicle Suspension


We love our Sumos. They are easy to install and they helped with our sway and jouncing. Unfortunately, we just added a new rear suspension package which lifted the rear about 2 inches. Now the Sumos don’t touch the axle and won’t provide much sway damping. They act now more like a very fancy jounce bumper. Still good to know that the rear Sumos will give us extra protection should we hit a wicked pothole. Front sumos still snug against the axle and helping with sway and crosswinds



- SS78DR
by:

Review from a similar SumoSprings Solo in Vehicle Suspension


I have always used airbags in the past and this is my 1st time using SumoSprings and I can say I will never go back to airbags! I run a heavy load on a 21’ 4Runner pulling a Teardrop with two motorcycles on stock suspension



- SSR-313-54
by:

Review from a similar SumoSprings Solo in Vehicle Suspension


I am happy doing bussines with Etrailer, I ordered the wrong Super springs for my Ram Promaster 2500 by mistake, called them up spoke to miss Paula and she was able to find and ship the correct one fot my Vehicle within a couple of days. She even send me a Return lable so I can return the other one back to the company. I look forward to continue doing bussines with this company.



- SSR-130-54
by:

Review from a similar SumoSprings Solo in Vehicle Suspension


Installed these on our 24' 2018 Sunseeker. Need small hands to get past the wiring and fuel lines in order to access the bolts to remove the old bump stops and install the new spring assembly. Insructions say to install the bracket first, then bolt on the springs. I found it easier to do the assembly on the work bench. I found there was enough space to install the entire assembly into position if the motor home was raised by the frame. I used thread lock gel on the bolts for added security. So far very pleased with the way the motor home handles on the road. No more sway on those twisty mountain roads. Also the rear skids no longer drag when exiting our driveway. On this short and relatively light motor home I did not find it necessary to use the spacers as this would have likely made the ride too stiff. Will recommend these to my sister who also has a Ford based motor home.


Comments
SumoSprings are working just fine. Wished they would of provided a flat pad for them to rest on instead of the rounded axle housing they rest on now.
Ivan - 04/15/2022


- SSR-612-40
by:

Review from a similar SumoSprings Solo in Vehicle Suspension


We installed the SumoSprings SSR-612-40and replace the OEM shocks with the Rancho RS9000 XL on a 2016 Nissan Frontier. When pulling a trailer (KZ Sportsmen Classic 160QB)the back of the truck sag only 1 1/4".I have used Sumosprings in the past and with great results.



- SS95MR
by:

Review from a similar SumoSprings Solo in Vehicle Suspension


This is one of the best upgrades ever. The sumo springs were like adding pillows to the back. Took out the bad body roll and rear shock chatter from the factory junk rancheros. On my Sierra 1500 2017 z71. Easiest install and upgrade spent on this truck.



- SS65FR
by:

Review from a similar SumoSprings Solo in Vehicle Suspension


Work great!!!! Super easy install. Took me 20 minutes to install both springs. They reduced the sag on my Silverado by a little over an inch when hooked up to our RV.



- SSR-209-40
by: 05/25/2021

Review from a similar SumoSprings Solo in Vehicle Suspension


2018 silverado z71 crew cab 6'6 bed Replaced air bags with 1000# sumo springs. Do a lot of offroading and bags limited travel. With these I can use my suspension and stay level on the trip with all my gear. Nicer ride unloaded and even sweeter when loaded. Easy 40 min install if you're use to working on your own stuff. A definite upgrade.



- SSR-207-47
by:

Review from a similar SumoSprings Solo in Vehicle Suspension


Good piece of gear, works great supporting my new grand design 5th wheel. Installing was easy, only information I can pass is the 2x4 was not enough to seat the spring, had to add another 1/2 piece of wood to help seat the spring inside the cup..


Comments
Great, after 1 year the spring is still doing its job. No issues no complaints
George W - 04/09/2021


- SS38HR
by:

Review from a similar SumoSprings Solo in Vehicle Suspension


I just wanted to share the amazing experience I had with etrailer.com. i purchased the sumo springs for my beautiful nissan frontier (rear bump stop version) not for hauling heavy loads but more for body roll and help stiffen up the ride a bit and piece of mind. I installed an alldogs offroad suspension lift with the add a leaf in the rear and the sumo springs just complete the whole system I'm my opinion. Upon receiving the sumo springs, I had a question about the correct alen key needed for the set screw. I emailed etrailer.com and received a quick response with all the info I needed. Christine was very very helpful and I just really appreciate that. You can't go wrong with etrailer.com and I am a lifelong customer for sure! Thank you etrailer!



- SSR-117-40
by:

Review from a similar SumoSprings Solo in Vehicle Suspension


My F150 seemed to have super soft rear springs. After adding a topper, any payload made it squat. The Sumo Springs have really helped stop that from happening. I'd recommend them to anybody that ever plans on putting anything in/on the bed of their truck or towing a trailer. You get the performance of airbag overloads without having install an air compressor or plumbing.



- SSR-329-47
by:

Review from a similar SumoSprings Solo in Vehicle Suspension


Hard to install for 2008 Dodge Sprinter. Had to bend some metal on the van and use some grease along with tire removal. Purchased with matching front sumo springs. The front were easy install. I can tell a ride difference in the front but not the rear. The front spring stay in constant contact with the lower tire arm. The rear springs are not in contact with the rear axel. I attribute no rear ride difference due to this. The van has the original rear leaf strings with no other modification. Possibly when more weight is in the van a difference in ride could be felt.


Comments
I would like to reach out to the manufacturer about the issues that you are having with the rear springs. I wanted to ask if you have the 2500 or 3500 Dodge Sprinter van?
-- Etrailer Expert Jenny N - 04/02/2022

33
1430
Show More Reviews

Ask the Experts about this SuperSprings Intl Vehicle Suspension

Do you have a question about this Vehicle Suspension?




  • Why etrailer.com?

    At etrailer.com we guarantee:
  • Highest quality vehicle suspension for the best price.

    Our Lowest Price Pledge ensures you will never overpay for the parts you need.
  • Real product know-how.

    We make sure that the products we sell are what we say they are, and that they work the way they are supposed to work. Get real advice from a real person who has the knowledge and expertise needed to solve your problem.
  • Most detailed, accurate vehicle suspension information available.

    Because we take providing accurate product information seriously, we take our own detailed product photos, demo videos and installation videos, as well as verify measurements, instructions, and vehicle fit information.
  • Installations, made easy.

    We love helping people and have the most highly-trained customer service, hands-on experience, step by step videos and installation instructions.
  • Fast shipping.

    Your order is automatically routed to get out of our warehouse and to your door as quickly as possible. Receive free shipping on orders over $99.
  • Personalized service for life.

    We provide one-on-one, personalized service from the ordering process through the life of your product.
  • Trusted since 1946.

    We've been serving customers since our parts store first opened in 1946 and continue to be recognized by our customers, our vendors and third parties for exceptional service.
  • Returns Policy

    Need to return an item? No problem. Please read our Returns Policy for more information.

Info for this part was:

Employee Leah B
Edited by:
Leah B
Employee Andrew K
Video by:
Andrew K
Employee Jeff D
Installed by:
Jeff D
Employee Robert C
Installed by:
Robert C
Employee Mary E
Written by:
Mary E
Employee Wilson B
Updated by:
Wilson B
Employee Alex H
Updated by:
Alex H
Employee Noah M
Updated by:
Noah M

At etrailer.com we provide the best information available about the products we sell. We take the quality of our information seriously so that you can get the right part the first time. Let us know if anything is missing or if you have any questions.