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SumoSprings Solo Custom Helper Springs - Rear Axle

SumoSprings Solo Custom Helper Springs - Rear Axle

Retail:$389.66
Our Price: $339.99
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Vehicle Suspension

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2,800-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-121-54 can be ordered online at etrailer.com or call 1-800-496-5010 for expert service.
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SuperSprings Intl Vehicle Suspension

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

2,800-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, high-density 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): 2,800 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-121-54 SuperSprings Sumo Springs Solo Rear Vehicle Suspension Kit for Vans

Item # SSR-121-54

Installation Details SSR-121-54 Installation instructions

This Product Fits The Following Vehicles




Customer Satisfaction Score:


Customer Reviews

SumoSprings Solo Custom Helper Springs - Rear Axle - SSR-121-54

Average Customer Rating:  4.7 out of 5 stars   (1666 Customer Reviews)

2,800-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.

by:
Ford Transit Connect

I have a set of SumoSprings on my Super Duty. Adding these to my Transit was a no brainer.
Install went without a hitch. I'm ready to take them out for a test run.




by:
Ford Transit Connect

These sumo springs did the job. I'm an electrician and our vans are heavly loaded when set up. I put them on a Ford 250 transit van to bring it back up to stock height after the van was loades with shelving, ladder racks, tools, and parts. The ride is great and the install was very easy. I would buy them again.




by:
2021 Ford Transit T350

Product was easy to install and definitely helped reduce body roll and sway when being passed by semi’s or transitioning over curbs.




by:

Better ride for my transit250 high roof extended van




by:

Significant improvement in the handling in windy and rough road conditions. Increased height of back of my 2017 Fuse 23A by 1 to 1 1/2 inch.
I added the springs to help with the addition of another a/c on top at rear of my unit.
Very pleased and installation was straight forward and relatively easy. Took about 1 hour to complete.


Comments
The increased handling and height gain are helpful on all the road conditions I have encountered. The ride is a little more stiff than the original factory suspension but the improvement of handling and reduction of sway is worth the small increase in the stiffer ride. Would recommend for all Winnebago Fuse owners
Gary - 06/30/2021


by:
2021 Ford Transit T350

Easy order. Quick delivery. Easy instal lation.




by:
2017 Ford Transit T350

Easy install, great performance, no maintenance. What could be better.




by:
2016 Ford Transit T350

These work out very well. The customer was happy. Not hard to install was a plus.




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by:

Review from a similar SumoSprings Solo in Vehicle Suspension


Very straight forward installation. Simple. very noticeable difference under load. Towing with the gooseneck also an improvement, looking forward to the longer road trip test. So far pleased with the product and results


Comments
after a year i could buy them again. great performance and no issues.
Richard J - 06/04/2022
My wife and I loved him on our trucks
-- comment by: Ben L - 07/26/2022


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


by:

Review from a similar SumoSprings Solo in Vehicle Suspension


I had Sumo helper springs installed on my Winnebago Sprinter RV both front and back. It made an amazing difference! It no longer felt like riding in a Conestoga wagon…swaying side to side and bouncing everything to the floor. The ride is now smooth. Driving was easier. Turns are suddenly level instead of feeling like I might turn over. I could not be happier with these products! And it only took 20 minutes to install all four!




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


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


by:

Review from a similar SumoSprings Solo in Vehicle Suspension


They help. My 2016 F250 feels more stable towing my 8500 pound travel trailer along with the EZ lift springs, plus Bilstein shocks.
A good combination upgrade I can afford and install myself in my driveway.




by:

Review from a similar SumoSprings Solo in Vehicle Suspension


I installed these myself on a 2020 F150 XLT 4x4 in half an hour. There was no need for a jack or jack stands because the ride height of the stock suspension allowed just enough room. As you can see in the photos, the assembly is about 9” tall, the same distance between the frame and the axle. The ride height remained the same as before using the 1” spacer! The instructions did fail to mention that a 15mm socket is needed to tighten the new hardware.

I do have a concern about the shape of the spring at the axle being unlike the oem bump stop. Why couldn’t the spring have the same contour so that deflection would be minimized? I say this because of the very close proximity of the brake lines and wiring harness to the helper spring, especially on the driver’s side. It would be interesting to film the movement of the helper spring as this vehicle is driven over rough roads to see just how close it comes to the brake lines. I’m not completely satisfied in the design, so we’ll see how this goes.




by:

Review from a similar SumoSprings Solo in Vehicle Suspension


The SumoSprings Helper springs have too much clearance between the spring and the axle. Probably because I have helper springs on the rear axle which raises the Sprinter somewhat.




by:

Review from a similar SumoSprings Solo in Vehicle Suspension


Parts arrived on schedule. At first I thought that the parts did not fit my truck, so I called customer service and they immediately started to send me a return label and refund. It turned out that I was wrong, and the parts did fit. I called them back cancelled the refund action.
Great friendly service!
I also found that the price I paid was much cheaper than [online store]. I highly recommend etrailer!


Comments
The springs still work as they should. They are nice because they dont seem to affect the ride quality when the camper is not on the truck. Very happy with my purchase.
David B - 05/31/2022


by:

Review from a similar SumoSprings Solo in Vehicle Suspension


Made towing TT with my Toyota Tundra much better. My camper has a tongue weight over 900 pounds. Made bridge crossing and overpasses much smoother.




by:

Review from a similar SumoSprings Solo in Vehicle Suspension


The massive ride feel improvement, I have a topper and drawers in the rear of my Tacoma. With the SumoSprings and medium-duty Old Man Emu leaf springs, the truck does not feel any hint of bucking or kicking anymore.




by:

Review from a similar SumoSprings Solo in Vehicle Suspension


As advertised very easy to install these Sumo Springs on my 21GMC 1500. I only installed the plate not the 1” spacer. I tow an RV and expect the ride to be more balanced and able to carry more “stuff”. Ride after install is still smooth but on larger bumps I can notice stiffness. Very satisfied right now




by:

Review from a similar SumoSprings Solo in Vehicle Suspension


The sumo springs have been a very good addition to my Toyota Tacoma DCLB. I added a leaf and changed the shocks at the same time I added the sumo and the truck rides about a half inch above the sumo. I definitely can feel the sumo kick in when I compress the rear on bumps etc. non loaded. It’s not a bad thing but I don’t get the same travel but I also don’t slam on the bump stop. With that said, both driving with a loaded up truck and trailering has been much better than before. I can definitely tell the sumo doing its job. I towed a 4000lb boat the other day and the truck behaved perfectly.



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Show More Reviews

See what our Experts say about this SuperSprings Intl Vehicle Suspension

  • Suspension Help for a 2017 Ford Transit 350 Cutaway Cargo Van
    There are springs available that will enhance the suspension of your 2017 Ford Transit 350 Cutaway, though there are no rear sway bars that will fit. The helper springs that will fit your 2017 Transit Cutaway are the SumoSprings Solo Custom Helper Springs # SSR-121-54 and # SumoSprings Solo Custom Helper Springs SSR-121-47. Each of these helper springs absorb shocks, reduce sway and keep your van level even when making sharp turns. They install without drilling and will not require any...
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  • Should SuperSprings or Air Lift be Used on a 2017 Thor Motor Coach Gemini Motorhome
    The air springs are great products but are more for hauling trailers or equipment. Since you have a model C motorhome I highly recommend going with the SumoSprings Solo Custom Helper Springs # SSR-121-54. The SumoSprings have a weight capacity of 2,800 lbs and will not only work to help control sway and squatting, but they are also maintenance free so after you install them you don't ever have to think about them again. Please note that any suspension enhancement system will not increase...
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  • SumoSprings for RV on 2016 Ford Transit 350 Chassis
    For your RV built on a Ford Transit 350 chassis I highly recommend the SumoSprings Solo Custom Helper Springs # SSR-121-54. These springs will compress to help the squatting you are experiencing in your motorhome. Any suspension enhancement you get is going to impact how your RV drives, but it will be an improvement. The SumoSprings # SSR-121-54 keep you level and work independently so there will be less sway and body roll as you turn. They are simple to install and do not require drilling,...
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    Yes the SumoSprings Solo Springs part # SSR-121-54 are a confirmed fit for your 2020 Ford Transit T350 with a high roof.
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    The perfect suspension kit you'd want is the SumoSprings part # SSR-121-54 which is a confirmed fit for the Cutaway chassis models of the 2017 Ford Transit T350 like what the RVs are built on. These are also very popular in the RV industry to help prevent sag and improve ride quality.
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  • Will SumoSprings Solo Custom Helper Springs SSR-121-54 Fit A 2020 Ford Transit T250 AWD?
    I reached out to SuperSprings and the SumoSprings Solo Custom Helper Springs - Rear Axle # SSR-121-54 you were looking at is confirmed to fit your 2020 Ford Transit T250 AWD and is a great option for adding 2800lbs of load leveling support to your rear suspension. I included a video review for you to take a look at.
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    I reached out to my contact at SuperSprings about the SumoSprings Solo Custom Helper Springs part # SSR-121-54 for a 2016 Ford Transit T350 chassis and they stated that the gap between the spring and contact point can vary by application as this spring can be used on both standard models and cutaways. The gap should be less when used on a motorhome but there are too many factors to say exactly what that will be. They stated a lot of these small Sprinter van chassis don't pre-load the spring...
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  • Mounting Bolt Sizes Used With SumoSprings Solo Helper Springs on 2017 Ford Transit T350
    The SumoSprings Solo Custom Helper Springs # SSR-121-54 will include 2 sets of M10-1.5 bolts for mounting in place of the factory bump stop. The lengths are going to be 55mm and 80mm to account for the different height spacers that you may need.
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    The chassis on your 2016 Ford Transit T250 cutaway is the same as the cargo van models so you can use SuperSprings # SSA11. But what I recommend that will work just as well and that costs less is the SumoSprings # SSR-121-54. They will help keep the van level, absorb road shock, and reduce sway or body roll.
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    For your 2017 Okanagan Tribute, on a 2016 Ford T350 chassis, the only kind of rear stabilizer available is the Blue Ox TigerTrak Rear-Axle Stabilizer # TT2603. This is a great option that will help to reduce the sway that you are experiencing but I also recommend adding some suspension enhancement as well. The SumoSprings Solo Custom Helper Springs # SSR-121-54 are the best option in this case for a few reasons. First of all they perform really well and we have received great feedback...
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    You can install both the SumoSprings Solo Custom Helper Springs - Rear Axle # SSR-121-54 and the Firestone Ride-Rite Air Helper Springs - Double Convoluted - Rear Axle # F2603 on your 2017 Winnebago Fuse motorhome, but it really comes down to what you are planning on towing/carrying as having both would be a bit of overkill. If you are not planning on towing with your motorhome using just the # SSR-121-54 would be my recommendation as they do not require any maintenance while still providing...
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  • Which Jounce Bumper Replacement Helper Spring for 2021 Ford Transit T250 Camper Conversion
    If your 2021 Ford Transit T250 is a high roof model, the Timbren # TFRTR350 you'd looked at would be a fit. This being said, the Timbren # TFRTR350 which provide a combined 5600 lb capacity would provide a pretty harsh ride, which I'm not certain you'd be happy with. Instead, I'd recommend the SumoSprings # SSR-121-54 which bolt to the frame above the rear axle, replacing the factory bump stops. The SumoSprings have a combined 2800 lb rated capacity, and are constructed of a more pliable...
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Info for this part was:

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Edited by:
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Video by:
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Expert Research:
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Employee Mary E
Written by:
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Updated by:
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