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

SumoSprings Solo Custom Helper Springs - Rear Axle

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$300.99
Vehicle Suspension

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1,500-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 SS45FR can be ordered online at etrailer.com or call 1-800-940-8924 for expert service.
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SuperSprings Intl Vehicle Suspension

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

1,500-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): 1,500 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-217-47 SuperSprings Sumo Springs Solo Rear Vehicle Suspension Kit for Trucks

Item # SS45FR

Installation Details SS45FR Installation instructions

This Product Fits The Following Vehicles




Customer Satisfaction Score:

Ratings & Reviews

4.7

2087 reviews
5 Stars
(1684)
4 Stars
(283)
3 Stars
(43)
2 Stars
(27)
1 Star
(50)
1,500-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

  • 2021 Chevy Silverado 1500 Gap Recommendation for SumoSprings Helper Springs
    You are looking for a 1/4" to 1/2" gap between the SumoSprings Solo Custom Helper Springs # SS45FR and the contact point on your 2021 Chevy Silverado 1500. This gives you enough space so the springs won't always be engaged, but if they are needed they will engage in an appropriate amount of time. This kit comes with a 1" spacer so you have the option to use that if the gap is larger than 1/2".
    view full answer...
  • Will SumoSprings Fit 2025 GMC Sierra 1500 Denali With Adaptive Ride Control
    Hi Brian; the SumoSprings # SS45FR will not fit your 2025 Sierra 1500 with Adaptive Ride Control. The answer from Sam is a little older and probably written before anyone knew about the restriction. I went ahead and corrected it, thank you for pointing this out. However, that doesn't solve the problem of suspension enhancement for your truck. I have two options for you that are compatible with Adaptive Ride Control. The first is the RoadActive Suspension Custom Leaf Spring Enhancement...
    view full answer...
  • Will the SumoSprings # SS45FR Fit My 2023 Chevrolet Silverado 1500 with 2" Lift?
    Hello John, Looks like you already found the right fit. The SumoSprings Solo Custom Helper Springs - Rear Axle # SS45FR is a great fit for your 2023 Chevrolet Silverado 1500. With having the 2" lift I am going to need a measurement from you to confirm these will work, can you please measure the distance from the underside of your frame where your bump stop sits to the axle directly below where the spring makes contact. I appreciate your time, and look forward to hearing from you.
    view full answer...
  • SumoSprings or Timbrens for a 2024 Chevy Silverado 1500 4x4
    Hey Dustin, thanks for reaching out! I will recommend SumoSprings over Timbrens all day everyday because they are much more forgiving when the vehicle is unloaded. We've actually joked around here about how the Timbren kits will either give you back problems or fix your back problems because of how rigid they make the unloaded ride quality. The SumoSprings Solo Custom Helper Springs # SS45FR have a 1,500 lb weight rating which will be great for the tongue weight of your 7,500 lb trailer....
    view full answer...
  • What Is Recommended Space for SumoSprings On 2020 Chevy Silverado 1500
    The SumoSprings Solo Custom Helper Springs part # SS45FR which are a fit for a 2020 Chevrolet Silverado 1500 will provide around a 1/4"-1/2" gap between the spring and contact point. These will have a much tighter fit than the Timbren Rear Suspension Enhancement System part # TGMRCK15S but since they are softer won't create any ride quality issues. If the vehicle has been lifted, you can use spacers like the Timbren 1" Spacer For Raised Frame Vehicles part # A25723-90AH00.
    view full answer...
  • Are SumoSpring Solo Custom Helper Springs A Fit For A 2025 Chevy Silverado 1500 ZR2
    Hi Edward, The SumoSprings Solo Custom Helper Springs # SS65FR is listed as not a fit for Trail Boss or ZR2 models so you would want to swap out those jounce springs for the SuperSprings Custom Suspension Stabilizer and Sway Control Kit # SSA28. This would sit over the factory leaf springs and only engage as weight is added to the rear suspension, which will prevent a stiff ride when you're unloaded. The other jounce spring options for your Silverado are all waaaaaay too high in capacity...
    view full answer...
  • Which Jounce-Style Suspension Enhancement Should I Install On 2020 Chevy Silverado 1500 Non Mag Ride
    The Timbren and Sumo Spring suspension enhancement systems use a jounce-style spring which is an excellent choice for leveling out your truck and trailer, all while improving handling and reducing trailer sway. They simply replace your factory bump stops and require a simple bolt-in installation process. The SumoSprings Solo Custom Helper Springs - Rear Axle # SS45FR are confirmed to fit your 2020 Chevrolet Silverado 1500 but this only has a 1,500lb weight capacity for the rear of your...
    view full answer...
  • Comparing The SumoSprings Solo Customer Herlper Springs # SS45FR And # SS65FR
    The SumoSprings Solo Custom Helper Springs # SS45FR and SumoSprings Solo Custom Helper Springs # SS65FR both have the same fitment but have different weight capacities. The # SS45FR is rated for 1,500lbs while the # SS65FR is only rated for 1,000lbs.
    view full answer...
  • What Timbren Rear Suspension Springs Fit a 2024 GMC Sierra 1500?
    The Timbren Suspension Enhancement System # T28MR is the kit which will fit your 2024 GMC Sierra 1500. Do understand this is a very heavy duty spring with a weight capacity of 8,600lbs. This will most likely give you a less than desirable ride quality. Instead I recommend checking out the SumoSprings in a 1,000LB # SS65FR or 1,500LB # SS45FR capacity. These are much more inline with the weight capacities of your Sierra. And as these are a progressive material it will not be as harsh of...
    view full answer...
  • Comparing SumoSprings and Timbren Springs For a 2023 GMC Sierra 1500
    Personally I feel the SumoSprings Solo Custom Helper Springs # SS45FR are a better option for your 2023 GMC Sierra 1500. These are not as stiff as the Timbren Springs # T28MR and will not cause such a harsh ride when not hauling additional weight or under light loads. These particular SumoSprings are rated for 1,500lbs which is more in line with the payload capacity for your Sierra. The Timbrens are rated for 8,600lbs which is far more than your truck would ever be able to carry.
    view full answer...
  • Will SumoSprings FIt 2021 GMC Sierra 1500 Elevation
    Good question, and your 2021 GMC Sierra 1500 Elevation is perfectly compatible with the SumoSprings Solo Custom Helper Springs # SS45FR. What happens a lot of times is people with standard models (not elevated) wind up not even using the 1 inch spacer that comes with the # SS45FR, so you won't have any issues with the SumoSprings fitting and providing your Sierra with the added suspension help.
    view full answer...
  • Recommended SumoSprings for a 2023 Chevy Silverado 1500
    Congrats on the upgrade! For your 2023 Chevy Silverado 1500, I recommend the SumoSprings Solo Custom Helper Springs item # SS45FR. These helper springs have a 1,500 lbs capacity that will keep your truck from squatting when you are loaded down with a bunch of dirt and rock. I have linked an installation video to help you get them set up.
    view full answer...
  • How to Get Rid of Too Large of Gap Between Frame and SumoSpring
    If you aren't using the included spacer of your kit you would want to. Ideally you want 1/4 inch to 1/2 inch of gap between the SumoSpring and the contact point on the vehicle. Since you are right at 1-1/2 inch that would indicate you are probably not using the spacer.
    view full answer...
  • Recommended Rear Suspension Enhancement For A 2020 Chevy Silverado 1500 Towing A Horse Trailer
    Timbren's are rated for a much higher capacity than SumoSprings typically are, but the trade off is that they tend to be very stiff and offer poor ride quality. SumoSprings like the Solo Custom Helper Springs # SS45FR offer a much softer progression so that it doesn't feel like you're hitting a pothole every time the suspension compresses. This specific set has a 1,500lb capacity, which should be equal to or greater than that of the tongue weight from your horse trailer so you should see...
    view full answer...
  • Best Option for Addressing a Squatting Rear End on a 2016 Chevy Silverado 1500
    SumoSprings would definitely be the solution I would recommend for your squatting concern. The SumoSprings Solo Custom Helper Springs - Rear Axle item # SS45MR have a 2,800 lbs capacity which would eliminate that carolina lift look you get when your bed is loaded. These springs have progressive load control, which means that the springs compress according to the weight of your cargo. If you're not towing or hauling you won't notice a difference unless you hit a pretty big bump. The leveling...
    view full answer...
    Image 1 for
  • Cost-Effective Suspension Enhancement For 2021 GMC Sierra 1500 Towing Light Travel Trailer
    The most cost-effective option that will give your 2021 GMC Sierra 1500 a more level, stable ride when you are towing your travel trailer is from SumoSprings, and there are two options with different capacities: - 1,000 lb Capacity: SumoSprings Solo Custom Helper Springs # SS65FR - 1,500 lb Capacity: SumoSprings Solo Custom Helper Springs # SS45FR The 1,000 lb capacity # SS65FR is what you will want to go with for a 5,000 lb travel trailer as that's more than enough capacity to handle...
    view full answer...
  • SumoSpring Recommendation for a 2022 Chevy Silverado 1500 LTD Trailboss
    For your 2022 Chevy Silverado 1500 LTD Trailboss you can either use the SumoSprings # SS65FR which is rated for 1,000 lbs or the SumoSprings # SS45FR which are rated for 1,500 lbs. I honestly just recommend going with the higher rating. SumoSprings is known for retaining the great OEM ride quality of trucks so having the extra capacity just means you'll get more support if you ever need it. Please note that a suspension enhancement system will only add some help to a current suspension...
    view full answer...
  • Unloaded Ride Quality Of SumoSprings On a 2022 GMC Sierra 1500 Limited
    The SumoSprings Solo Custom Helper Springs # SS45FR will be noticeable at times when driving your 2022 GMC Sierra 1500 Limited unloaded. The springs will have an air gap between them and your axle when you have no additional weight on the rear suspension so most the time you will not feel a difference in the suspension. You will likely notice a difference if you hit a pot hole or driving fast around corners. When the suspension compresses enough to contact the spring it will begin to absorb...
    view full answer...
    Image 1 for
  • Comparing SumoSprings and Timbrens for a 2021 GMC Sierra 1500 AT4
    The Timbren Suspension Enhancement System part # T28MR and SumoSprings Solo Custom Helper Springs part # SS45FR are both great options for a 2021 GMC Sierra 1500 AT4. I recommend the SumoSprings as they don't typically ride as rough as the Timbrens but the Timbrens also offer more support. They are both however bolt-on, no maintenance options. Please note, a leveling kit won't warranty any additional spacers to be added to the rear suspension enhancements. These kits are also not compatible...
    view full answer...
  • Do the SumoSprings Solo Helper Springs Fit a 2021 Chevrolet Silverado 1500 Trail Boss?
    For your 2021 Chevrolet Silverado 1500 Trail Boss, I recommend using the SumoSprings Solo Custom Helper Springs - Rear Axle item # SS45FR over the Timbrens. There are no compatibility issues with your Trail Boss edition Silverado. The SumoSprings have a 1,500 lbs capacity and will keep your truck level when you're towing or hauling a heavy load. They have progressive load control which means that the more weight you put on or in the back of your truck the more the springs will compress....
    view full answer...
  • Recommended Suspension Upgrade for a 2023 GMC Sierra 1500
    Congrats on the new truck! The Timbren item # T28MR will work and it'll keep the rear end of your 2023 GMC Sierra 1500 from squatting but they're also going to give you a rough ride when you are not towing or have your camper. They're just a solid piece of rubber and they don't have much give to them. I recommend using the SumoSprings Solo Custom Helper Springs item # SS45FR instead. These have a 1,500 lbs capacity and only engage when there is weight added to your truck. When you are...
    view full answer...
  • Comparing SumoSprings Solo Custom Helper Springs for a 2022 Chevy Silverado 1500
    There are two SumoSprings Solo Custom Helper Springs for a 2022 Chevrolet Silverado 1500, part # SS65FR which has a 1,000 lb weight capacity and part # SS45FR which has a 1,500 lb weight capacity. The lower rated option rides smoother whereas the higher rated option provides more support. The correct one will come down to what you're towing or hauling. If you have a heavy trailer over 10K then go with the higher rated part # SS45FR but for most others under this use the lower rated part...
    view full answer...
  • How Much Space Should There Be Between SumoSprings And My Axle Pad On 2021 Chevrolet Silverado 1500?
    With the SumoSprings Solo Custom Helper Springs # SS45FR or # SS65FR installed on your 2021 Chevrolet Silverado 1500 with no additional cargo weight you will see 1/2" of clearance between the spring and your axle pad. This allows for you to have a comfortable ride when you are unloaded. SumoSprings does include an additional 1" spacer and longer mounting bolts with both kits that will allow you to add preload to your springs if so desired. This comes in handy if you always have additional...
    view full answer...
  • SumoSprings for 2021 Chevolet 1500 Trailboss w/ Factory 2 Lift
    I reached out to my contact at SuperSprings to determine the best helper spring for your 2021 Trailboss truck. You were comparing the SuperSprings # SS45FR with the SuperSprings # SS65FR. These helper springs will have about a 1" gap before they contact the suspension and then they will compress and further support your load, so there will still be just a little bit of squat at the back of the truck. The # SS45FR springs are bigger and will support more, whereas the # SS65FR springs are...
    view full answer...


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Info for this part was:

Employee Mike L
Expert Research:
Mike L
Employee Jameson C
Expert Research:
Jameson C
Employee Jeff D
Installed by:
Jeff D
Employee Joshua S
Video Edited:
Joshua S
Employee Jacob T
Video Edited:
Jacob T
Employee Dustin K
Video Edited:
Dustin K
Employee Chris R
Video Edited:
Chris R
Employee Jonathan Y
Video Edited:
Jonathan Y
Employee Wilson B
Updated by:
Wilson B
Employee Noah M
Updated by:
Noah M
Employee Daron K
Edited by:
Daron K
Employee Alex H
Written by:
Alex H
Employee Aidan B
Test Fit:
Aidan B
Employee Bradley B
Test Fit:
Bradley B
Employee John S
Video by:
John S

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