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  1. Vehicle Suspension
  2. SuperSprings Intl
  3. Towing/Load Leveling
  4. Bump Stops
  5. Light Duty
  6. Rear Axle Suspension Enhancement
SumoSprings Solo Custom Helper Springs - Rear Axle
SuperSprings Intl

SumoSprings Solo Custom Helper Springs - Rear Axle

Part Number: SSR-121-40
In Stock
$310.99
Retail:$399.99
You Save: $89.00
Vehicle Suspension

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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. Great Prices for the best vehicle suspension from SuperSprings Intl. SumoSprings Solo Custom Helper Springs - Rear Axle part number SSR-121-40 can be ordered online at etrailer.com or call 1-800-940-8924 for expert service.
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SuperSprings Intl Vehicle Suspension - SSR-121-40

  • Towing/Load Leveling
  • Bump Stops
  • SuperSprings Intl
  • Light Duty
  • Rear Axle Suspension Enhancement

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-121-40 SuperSprings Sumo Springs Solo Rear Vehicle Suspension Kit for Vans

Installation Details SSR-121-40 Installation instructions

This Product Fits The Following Vehicles




Customer Satisfaction Score:

Ratings & Reviews

4.7

2033 reviews
5 Stars
(1643)
4 Stars
(274)
3 Stars
(43)
2 Stars
(25)
1 Star
(48)
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.

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See what our Experts say about this SuperSprings Intl Vehicle Suspension

  • Can RoadActive Suspension and SumoSprings be Used Together on a 2018 Ford Transit T150
    You can definitely add both the RAS Custom Leaf Spring Enhancement Kit # RAS3623-GT as well as the SumoSprings Solo Custom Helper Springs # SSR-121-40 to not only give you a much smoother driving experience but also help fight sway from high winds or passing vehicles. All of this should help to keep your equipment from bouncing in the back. I will say that even though these will drastically improve your driving experience, if your equipment doesn't weigh very much then it could still move...
    view full answer...
  • What Sumo Springs Are Recommended For My Ford Transit T350 2015 Rear Suspension
    We can definitely find a suspension enhancement that will work for your 2015 Ford Transit T350. My first suggestion would be to take care of your suspension first if you think there is a problem. None of the suspension enhancements are designed to help a vehicle that has suspension that does not work properly. Once that is taken care of, you can look at the different options. If you go with the Sumo Springs, I recommend the SumoSprings Solo Custom Helper Springs - Rear Axle, pat # SSR-121-47....
    view full answer...
  • Sumo Springs Solo Helper Spring Recommended for Coachmen Beyond Class B Motorhome
    You'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...
  • Dimensions of SumoSprings kit part # SSR-121-40
    The height of the SumoSprings kit part # SSR-121-40 that you referenced is 10-3/4 inches, the width is 7-1/4 inches and the spring diameter is 4-1/2 inch.
    view full answer...
  • 2017 Thor Class B Gemini On Ford Transit 350HD Chassis Anti-Sway Bar and Suspension Enhancement
    I do have an option for you but there are not air springs available for the 2017 Thor Class B Gemini on the Ford Transit Chassis. I recommend to use a Roadmaster Anti-Sway Bar part # RM-1209-120 to minimize sway. The sway bar attaches to the rear axle and chassis to brace the frame as it shifts to minimize the side-to-side movement you are experiencing. To soften the ride, I recommend SumoSprings Solo Custom Helper Springs part # SSR-121-40 for the rear axle. The SumoSprings are designed...
    view full answer...
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  • Recommended SumoSprings for a 2017 Coachman Freelander 20CB on a Ford Transit Chassis
    I would be happy to help you. It looks like your 2017 Coachman Freelander 20CB has a total weight of right around 10,000 lbs. I recommend going with the 1,500 lbs item # SSR-121-47 SumoSprings. The extra capacity of the 1,500 lbs system will help you level out your suspension and compensate for the cabover portion of your motorhome. The SumoSprings will also help balance your rear end out from side to side. I have linked an installation video below for you to take a look at.
    view full answer...

Do you have a question about this Vehicle Suspension?


Info for this part was:

Employee Leah B
Edited by:
Leah B
Employee Andrew K
Video by:
Andrew K
Employee Kathleen M
Installed by:
Kathleen M
Employee Robert C
Installed by:
Robert C
Employee Dustin K
Video Edited:
Dustin K
Employee Chris R
Video Edited:
Chris R
Employee Jonathan Y
Video Edited:
Jonathan Y
Employee Mary K
Written by:
Mary K
Employee Wilson B
Updated by:
Wilson B
Employee Alex H
Updated by:
Alex H
Employee Noah M
Updated by:
Noah M

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