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2023 Ford F-150 Lightning
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SumoSprings Solo Custom Helper Springs - Rear Axle
Part Number: SSR-121-54
In Stock
$362.99
2023 Ford F-150 Lightning
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- All Info
- Reviews (2548)
- Q & A (0)
- Photos
SuperSprings Intl Vehicle Suspension - SSR-121-54
Highlights
- Custom Fit for Your Vehicle: Mounts to existing attachment points
- 2,800-lb Load Support: Keeps your vehicle level under heavy weight for safer, more stable control.
- Zero Maintenance Required: No air lines, fittings, or pressure to check—just install and go.
- Smoother Ride on Any Road: Cushions bumps and shocks so the ride stays comfortable when loaded.
- Better Stability in Turns: Independent springs cut sway and body roll when cornering or hauling uneven loads.
- Built to Last: High-density microcellular urethane resists oil, salt, and UV damage from -25 F to 200 F.
Features to know about
Stay Level and Confident Under Load: 2,800-lb Rear Suspension Support
Heavy loads can make the rear of your vehicle sag, throwing off steering and braking. These SumoSprings Solo Custom Helper Springs add up to 2,800 lbs of support at 50-percent compression, helping your suspension stay level when towing or hauling cargo. They keep your ride height steady so front tires maintain better contact with the road for safer handling, steering control, and correct headlight aim.
Smooth Ride Over Bumps and Rough Roads: Progressive Load Control
Not every trip carries the same weight. These microcellular urethane springs compress easily with light loads for a softer, more comfortable ride, and stiffen progressively as weight increases. That means less bounce and sway when loaded and a smooth ride when empty—all without needing to adjust air pressure or monitor lines.
Stay Steady in Crosswinds and Turns: Independent Spring Action
When crosswinds or uneven roads try to push you around, each spring works independently to stabilize the vehicle. This helps control body roll on sharp turns and keeps the ride balanced even when loads are off-center. The result is a more controlled feel through corners, driveways, and highway gusts.
Built Tough for Real-World Conditions: Maintenance-Free Design
Made from high-density microcellular urethane, these springs resist abrasion, oil, salt, and UV damage while performing in temperatures from -25 F to 200 F. They compress vertically with minimal side expansion so nearby parts stay protected. With no air lines or pressure to maintain, they’re a simple, no-drill upgrade that adds lasting support without extra upkeep.
Specs
Weight and Capacity
- Weight capacity (at 50-percent compression): 2,800 lbs
Warranty
- Limited lifetime warranty
- 30-Day satisfaction guarantee
SSR-121-54 SuperSprings Sumo Springs Solo Rear Vehicle Suspension Kit for Vans
This Product Fits The Following Vehicles
- 2022 - 2022 American Coach American Patriot Motorhome FORD 148 - MD2
- 2019 - 2020 Coachmen Beyond Motorhome 22C - 3.5L EcoBoost
- 2019 - 2020 Coachmen Beyond Motorhome 22C - 3.7L Ti-VCT
- 2021 - 2022 Coachmen Beyond Motorhome 22C AWD
- 2021 - 2022 Coachmen Beyond Motorhome 22C RWD
- 2019 - 2020 Coachmen Beyond Motorhome 22D - 3.5L EcoBoost
- 2019 - 2020 Coachmen Beyond Motorhome 22D - 3.7L Ti-VCT
- 2021 - 2022 Coachmen Beyond Motorhome 22D AWD
- 2021 - 2022 Coachmen Beyond Motorhome 22D RWD
- 2020 - 2020 Coachmen Beyond Motorhome 22RB - 3.5L EcoBoost
- 2020 - 2020 Coachmen Beyond Motorhome 22RB - 3.7L Ti-VCT
- 2021 - 2022 Coachmen Beyond Motorhome 22RB AWD
- 2021 - 2022 Coachmen Beyond Motorhome 22RB RWD
- 2017 - 2019 Thor Compass Motorhome 23TB
- 2021 - 2022 Thor Compass Motorhome 23TE
- 2017 - 2019 Thor Compass Motorhome 23TK
- 2016 - 2019 Thor Compass Motorhome 23TR
- 2019 - 2022 Thor Compass Motorhome 23TW
- 2020 - 2021 Coachmen Cross Trek Motorhome 20XG
- 2020 - 2021 Coachmen Cross Trek Motorhome 21XG
- 2018 - 2019 Coachmen Crossfit Motorhome 22C
- 2017 - 2019 Coachmen Crossfit Motorhome 22D
- 2022 - 2022 Winnebago Ekko Motorhome 22A
- 2022 - 2022 Winnebago Ekko Motorhome 24C
- 2017 - 2025 Forest River Forester Motorhome TS2371
- 2018 - 2025 Forest River Forester Motorhome TS2381
- 2017 - 2018 Forest River Forester Motorhome TS2391
- 2017 - 2019 Coachmen Freelander Motorhome 20CB Micro
- 2016 - 2016 Coachmen Freelander Motorhome 20CBT
- 2016 - 2020 Winnebago Fuse Motorhome 23A See All Vehicle Fits
Customer Satisfaction Score:
97% were satisfied with this product
3% of customers were not satisfied
- Wrong item was ordered
- Too difficult to install
Ratings & Reviews
4.7
2548 reviews
by:
Paul
05/31/2026
Definitely improved the ride... Much firmer cornering and handling... Super easy installation but note that due to the clearance, you will need to put the deep socket in first, then the short extension & then connect the ratchet. Also, I reached above the spring and hand threaded the long bolt before using the wrench.
by:
Daniel
06/12/2026
Installed easily once I got the correct small extensions so I could get them back out after tightening. With both spacers on my 21 Thor Gemini it sits about 1/4” off axle plate. Helps significantly with body roll.
by:
C
05/04/2026
Ford
Transit Connect
I think this is the best option for my 2023 Ford Transit Trail 350. It has somewhat restored the leaf spring arc. The way I think it should be.
by:
Julian C
12/10/2024
The sumosprings make a noticable improvement in handling of my RV.
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.
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:
Allen
03/05/2022
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:
db
03/26/2023
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:
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.
Install went without a hitch. I'm ready to take them out for a test run.
by:
Chris
01/06/2023
Very easy to install. Improve suspension considerably. Melissa was a pleasure to deal with when ordering.
Chris
1/6/2024
Works exactly as it should. Stabilizes my Ford transit350.
by:
Keith
12/24/2024
As always, I needed a host of devices to set up our new Toad, and etrailer was the perfect choice! Lot of product, in stock, for a decent price, and shipped quickly! HIGHLY recommend
by:
MJ
06/21/2024
Definately noticed the ride difference just leaving the driveway entering the street. Less sway and more solid feel of a ride. Installation was a bit trying to begin with, getting all the right combinations of sockets, extentions, ratchet in the tight area. Once that was figured out, the passenger side was completed in 10 minutes.
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:
Cliff
04/11/2022
2021
Ford
Transit T350
Easy order. Quick delivery. Easy installation.
by:
Nick
05/04/2018
2016
Ford
Transit T350
These work out very well. The customer was happy. Not hard to install was a plus.
by:
Robert
10/17/2018
2017
Ford
Transit T350
Easy install, great performance, no maintenance. What could be better.
by:
Alex A.
04/18/2026
by:
Dan
04/27/2023
A great investment!
by:
Kevin
08/17/2022
2020
Ford
Transit T250
by:
Billy
09/19/2022
by:
Charlotte
05/25/2021
by:
Peggy
04/05/2021
by:
Lawrence
06/26/2024
by:
Paula
02/13/2023
2017
Ford
Transit T250
by:
Michael
05/09/2026
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.
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.
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Show More Reviews
See what our Experts say about this SuperSprings Intl Vehicle Suspension
- 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... - 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... - 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... - 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... - 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... - 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...
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... - 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... - 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... - 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... - 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... - 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... - 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... - 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... - 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... - 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... - 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... - 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... - 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...
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Do you have a question about this Vehicle Suspension?
Info for this part was:
Edited by:
Leah B
Video by:
Andrew K
Video by:
Ethan H
Expert Research:
Jameson C
Video Edited:
Dustin K
Video Edited:
Jonathan Y
Written by:
Mary K
Updated by:
Wilson B
Updated by:
Alex H
Updated by:
Michael B
Updated by:
Noah M
Installed by:
Robert C
Test Fit:
Bradley B
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Brooke M.
12/11/2024
Sounds like theyre doing their jobs well and thats great to hear! Were you on a the road a lot this summer?