SumoSprings Solo Custom Helper Springs - Rear Axle
(2276 reviews)
Price: $351.99
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SumoSprings Solo Custom Helper Springs - Rear Axle
Item # SSR-121-54
Retail:$385.22
Our Price: $351.99
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SuperSprings Intl Vehicle Suspension - SSR-121-54
- Jounce-Style Springs
- Rear Axle Suspension Enhancement
- Standard Duty
- SuperSprings Intl
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.
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.
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
Installation Details
This Product Fits The Following Vehicles
- 2015 - 2023 Ford Transit T150 Cargo Van
- 2015 - 2023 Ford Transit T150 Passenger Wagon
- 2015 - 2023 Ford Transit T250 Cargo Van
- 2015 - 2023 Ford Transit T250 Passenger Wagon
- 2015 - 2023 Ford Transit T350 Cargo Van
- 2015 - 2023 Ford Transit T350 Passenger Wagon
Customer Satisfaction Score:
97% were satisfied with this product
3% of customers were not satisfied
- Wrong item was ordered
Customer Reviews
SumoSprings Solo Custom Helper Springs - Rear Axle - SSR-121-54
Average Customer Rating: 4.7 out of 5 stars (2276 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: Chris 01/06/2023
Very easy to install. Improve suspension considerably. Melissa was a pleasure to deal with when ordering.
by: db03/26/2023
Easy to install. Used on a custom campervan that is loaded slightly less than GVCW. The Sumo springs, with their progressive dampening characteristics, removed the sway of vehicle and improved the general handling. Highly recommend.
by: Gary 06/29/2020
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.
Gary
6/30/2021
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
by: Allen03/05/2022
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: Mark 07/24/2022
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: John 08/07/2022
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: Dan 04/27/2023
A great investment!
by: Cliff04/11/2022
2021 Ford Transit T350
Easy order. Quick delivery. Easy instal lation.
by: Nick05/04/2018
2016 Ford Transit T350
These work out very well. The customer was happy. Not hard to install was a plus.
by: Robert10/17/2018
2017 Ford Transit T350
Easy install, great performance, no maintenance. What could be better.
by: Billy 09/19/2022
by: Kevin 08/17/2022
2020 Ford Transit T250
by: Charlotte 05/25/2021
by: Peggy04/05/2021
by: Paula 02/13/2023
2017 Ford Transit T250
by: David03/21/2023
I believe it’s going to be a great addition to my truck when pulling our RV. Looking forward to a smoother, more even ride. I left the 2x4 blocks in overnig8ht and drove around to ensure a good seat for the springs.
by: Tony04/08/2023
Very easy installation in about 20 minutes. Very ingenious concept as opposed to bolt on leaf style helper springs
by: Jeremy01/04/2023
I installed Sumo Springs on our 06 Xterra right after we bought our Casita 17' trailer. The back of the X squatted a bit more than I liked. I had also noticed before some tendency to bottom out if the car was full of people and stuff. These ingenious devices are a perfect solution for me! They are about 3/4" clear of being engaged with the axle when unloaded, so the ride is not overly affected, but progressively take up some of the weight when the back end starts coming down with load. It now sits very nicely with the trailer connected, no weight distributing hitch and stuff in the back, and no more bottoming. We've put a good number of miles on the X in the last year, towing and not towing, and they are still doing the job.
I should note, the back of my Xterra is lifted about an inch with AAL springs. If that were not the case, the Sumo Springs would be engaged all the time. That will vary with vehicle.
I will also note that they are non-adjustable, unlike airbags. I kinda like that, I didn't want to mess with adjusting air pressure and such. But once they do start kicking in as one or both wheels travel, they do stiffen it up quite a bit. I mean, there's no way around that; you can't take load without stiffening the suspension. As such I think they inhibit upward axle articulation a bit when 4-wheeling, but for us that's not a big deal. Since they do not connect to the axle, they don't affect downward articulation at all.
The pics are shortly after installation, one with the car unloaded, and two with trailer and gear loaded up.
by: Dan08/01/2023
These Sumo Springs were easy to install, even for a 70 year old guy. I tow a 7,000lb camper and even tho I have a nice WDH I still had som sag on my Tundra. These helped level it out when towing and got rid of “some” of the bounce. They were really a godsend when I overloaded the bed with about 2,000lbs of pavers. That weight squished the Sumos significantly but the truck drove and rode great. Better and less expensive than air bags.
by: Kenneth02/22/2023
Gave it 5 because of ease of install - note they use SAE threads 9/16, truck frame and oem is metric 15mm wrench. Makes no difference but don't use oem nuts on spring. I installed all shims supplied and this left about 3/4" gap so hoing its the best for my needs. Easy to reduce if needed.
by: Thomas07/09/2022
The SumoSprings Solo came to the RV Resort today. I installed them on my Titan SV today in less than an hour. Only drove 10 miles with them and they are what I was looking for. In my opinion it was a needed upgrade and thumbs up!
by: Zach01/24/2024
While these worked great for the first few months and helped level the load, they have now become deformed and squished out of shape permanently. We have a slide in camper that is on the truck for only for trips otherwise the truck is unloaded and off the bumps. I did not expect them to deform so much, and so easily after only a year of use.
by: William01/13/2024
I have had these on my Jeep Gladiator for over a year now and I still like them. Sumo Springs really help with sag when towing my Scamp camper trailer and when the truck bed is loaded with stuff. When it is cold outside they are stiffer and I can feel when they hit the stops on hard bumps. Sumo Springs are a very easy overload spring option with factory lift.
by: Curt03/16/2024
Fairly simple to put on but need to work around the brake lines and bed cross beams. I haven’t tried it yet with weight. I have enclose pic of drivers side. Maybe can’t tell from the pic but there is space and flexibility around the lines around bolt.
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See what our Experts say about this SuperSprings Intl Vehicle Suspension
- Mounting Bolt Sizes Used With SumoSprings Solo Helper Springs on 2017 Ford Transit T350The 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.
view full answer... - Which Jounce Bumper Replacement Helper Spring for 2021 Ford Transit T250 Camper ConversionIf 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...
view full answer... - Does SumoSprings Solo Spring Kit # SSR-121-54 Fit 2020 Ford T350 TransitYes the SumoSprings Solo Springs part # SSR-121-54 are a confirmed fit for your 2020 Ford Transit T350 with a high roof.
view full answer... - Recommended Suspension Enhancement For a 2018 Ford Transit 350HD Camper VanFor your 2018 camper van on the Ford Transit 350HD having the dual wheel wheels I recommend installing the SumoSprings Solo Custom Helper Springs # SSR-121-54. These will help to reduce the rear end sag and increase stability around turns. The Firestone # F53ZR and other air spring products we carry are not compatible with your dual rear wheels. You can also add the Coil SumoSprings # CSS-1195F to your front suspension. These will also help increase stability when turning while also helping...
view full answer... - Recommended Suspension Enhancement For 2016 Thor Gemini 23TRI do have a suspension enhancement option for you but the Firestone Ride-Rite Air Helper Springs part # F2603 are designed for the Ford Transit Cargo Van. There are currently not any air bags available for the 2016 Thor Gemini 23TR on Transit Chassis but I recommend to use the SumoSprings part # SSR-121-54. According to our installers, the SumoSprings progressive spring design is much better at combating sway and supporting the load on a motor home compared to air bags. The progressive...
view full answer... - Recommended Rear Suspension Enhancement for a 2020 Ford Transit T350 with Dual Rear WheelsI have a few different suggestions and it all depends on what style of 2020 Ford Transit T350 you have. If your T350 is a cargo van then the best suspension enhancement available is the Firestone Ride-Rite Air Helper Spring Kit # F2603 because you can manually adjust how much help your rear suspension is getting at any given point in time. To help you monitor and control the amount of psi in the air springs I also recommend installing the Air Command Compressor System # F2610. This not...
view full answer... - SumoSprings for RV on 2016 Ford Transit 350 ChassisFor 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,...
view full answer... - SumoSprings and Sway Bar For a Thor Compass On 2018 Ford Transit 350HD ChassisYes, I always prefer to also install the Front # CSS-1195F with the Rear # SSR-121-54 SumoSprings on your Thor Compass with the 2018 Ford Transit 350 HD chassis. The combination will greatly improve your ride quality and reduce the amount of sag the chassis will have due to the additional weight. We do offer the Hellwig Adjustable Rear Anti-Sway Bar # HE44YR for your Transit chassis. This is the only currently available sway bar I can find. The 1-3/8" chromoly steel bar is going to be...
view full answer... - Suspension Help for a 2017 Ford Transit 350 Cutaway Cargo VanThere 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...
view full answer... - Rear Helper Springs for a 2016 Ford Transit T250 Cutaway with KUV Utility BodyThe 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.
view full answer... - Is There a Gap with SumoSprings Solo Custom Helper Springs On 2016 Ford Transit T350 ChassisI 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...
view full answer... - 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.
view full answer... - Can SumoSprings SSR-121-54 Be Installed W/ Firestone F2603 On 2017 Winnebago Fuse Motorhome?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...
view full answer... - Sumo Springs Solo Helper Spring Recommended for Coachmen Beyond Class B MotorhomeYou're on the right track in my opinion. I'd eliminate the Sumo Springs Solo # SSR-121-54 from consideration because that'd be more support than you'd actually need and would tend to provide a harsher ride than what your looking for. The SumoSpirings # SSR-121-40 offers 1000 lbs of additional support and the # SSR-121-47 would give 1500 lbs of additional support. The # SSR-121-47 would provide the best compromise between the needed support without making your motorhome ride like a buckboard,...
view full answer... - Suspension Enhancement Recommendation for Ford Transit T350 RV Orion RVThe 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.
view full answer... - Will The SumoSprings Solo Custom Helper Springs # SSR-121-54 Fit a 2024 Ford Transit 350? I do see the 2024 Ford Transit 350 is unchanged from the 2023 model year so there should be no reason the SumoSprings Solo Custom Helper Springs # SSR-121-54. When I reached out to SumoSprings they have not yet been able to verify fitment yet as they have not had a 2024 in their facility to test on.
view full answer... - Recommended Air Helper Springs For A 2020 Ford Transit T250 With 6 Inch LiftWhen installing Air Helper Springs on your 2020 Ford Transit T250 with a 6 inch lift I recommend The Air Lift LoadLifter 5000 Ultimate Air Helper Springs with Internal Jounce Bumpers - Rear Axle # AL88213. The Sumo Spring option # SSR-121-54 will not work because there is not way to get it to work with the 6 inch lift. The Airlift # AL88213 has a 2-ply, fabric-reinforced rubber air spring which is very durable. The load-leveling capacity is up to 5,000 pounds, and the adjustable air pressure...
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- Recommendation to Help Reduce Rear Sway on a 2017 Okanagan Tribute with Ford T350 ChassisFor your 2017 Okanagan Tribute, on a 2016 Ford T350 chassis, 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 from customers regarding the SumoSprings regardless of what vehicle they are installed on. Secondly once they are installed they have zero maintenance so you get the benefit of improved ride quality without the hassle of maintaining a suspension...
view full answer... - Should SuperSprings or Air Lift be Used on a 2017 Thor Motor Coach Gemini MotorhomeThe 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...
view full answer...
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Info for this part was:
Edited by:
Leah B
Video by:
Andrew K
Expert Research:
Jameson C
Written by:
Mary K
Updated by:
Wilson B
Updated by:
Alex H
Updated by:
Noah M
Installed by:
Robert C
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Chris
1/6/2024
Works exactly as it should. Stabilizes my Ford transit350.