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SumoSprings Solo Custom Helper Springs - Rear Axle

SumoSprings Solo Custom Helper Springs - Rear Axle

Item # SS45MR
Our Price: $324.99
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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. Lowest Prices for the best vehicle suspension from SuperSprings Intl. SumoSprings Solo Custom Helper Springs - Rear Axle part number SS45MR can be ordered online at or call 1-833-496-1390 for expert service.
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SuperSprings Intl Vehicle Suspension - SS45MR

  • 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.


  • 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


  • 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-209-54 SuperSprings Sumo Springs Solo Rear Vehicle Suspension Kit for Trucks

Installation Details SS45MR Installation instructions

This Product Fits The Following Vehicles

Customer Satisfaction Score:

Customer Reviews

SumoSprings Solo Custom Helper Springs - Rear Axle - SS45MR

Average Customer Rating:  4.7 out of 5 stars   (1662 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.


I have a 2020 Silverado 1500 that I tow a 30 foot long 6500 pound dry travel trailer with. The stock suspension was a little soft and bouncy which made towing a bit of a white knuckle ride. I ordered the SumoSprings in hopes of helping this and I must say I think they did the trick. The install wasn't as straight forward though as the supplied spacers were not thick enough to properly space the plate that holds the spring far enough off the frame to clear the factory welded cup. Lucky for me I work at a machine shop so I turned a couple of new spacers out of aluminum the proper thickness which in my case was .700 thick compared to the supplied 1/2 inch thick. In order to use the supplied spacers I would have to rotate the mounting plate into the opening of the welded cup which put the springs in the wrong location. After all is said and done I towed with it this weekend and it was night and day. Extremely happy with the ride now and if it weren't for those spacers I would have given 5 stars. The truck still rides close to factory unloaded which is what I wanted and the springs really only come into play when the camper is attached. Nice product otherwise!


I had limited knowledge about this type of product and wasn't aware of the options.
I purchased the yellow but think that the blue would have been a better fit for my needs.
Now I have to switch back and forth to stock bump stops
They are great with the slide in camper on the truck but way to much with it off.

2015 GMC Sierra 1500

Installed them today but, haven't put a load on them yet. Drove around with them and am excited to get my trailer hooked up. They are no joke. I will be pulling almost 9500 lbs with my gmc 1500. The truck does great the handling needed some help.

2017 GMC Sierra

These literally took 30 minutes to install. I did install them with the wheels off and then installed the super springs as well. Towed a 8K lb bumper pull 900 miles after installation and they combined with the super springs transformed how my 1/2 ton towed. 2017 GMC Sierra 4x4. Fit was excellent and quality was good, USA made a definite plus.

Chevrolet Silverado 1500

I put them on my '15 chevy 1500.they support the extra weight of my 24' enclosed car hauler very well.they do make the rear of the truck ride a bit stiffer but I'll take stiff over squatted any day


Absolutely awesome

2012 Chevrolet Silverado

I put these on my 2012 Silverado 1500. With my heavy trailers, I was having problems with bouncing and stability. These fixed all of my issues. The truck drives great, even pulling my boat and trailer which are close to 6,000 pounds. The best part is that they don't effect the ride for daily driving.

2015 Chevrolet Silverado 1500

I was surprised at how fast my order was shipped to me I will make sure too order from you people again

2017 Chevrolet Silverado 1500

Josh helped me tremendously on proper installation upon my request


2012 GMC Sierra




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.

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


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

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: 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!!!

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


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!


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.

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


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.


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.


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.


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.


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


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.


Review from a similar SumoSprings Solo in Vehicle Suspension

Took all but 15 minutes each side to install. Haven't hooked up trailer yet, but looking forward to see how it handles.

Show More Reviews

See what our Experts say about this SuperSprings Intl Vehicle Suspension

  • Which SumoSprings Solo Fits 2020 Chevy Silverado 1500
    Yes the SumoSprings part # SS45MR is a fit for your 2020 Chevy Silverado 1500 Z71.
    view full answer...
  • Fitment Issues with Installing SumoSprings on a 2020 Chevrolet Silverado 1500
    When installing SumoSprings # SS45MR on your 2020 Chevrolet Silverado you will need a lift on the chassis of the vehicle and allow the rear axle to hang. The review may have been on an installation with the truck on the ground. It is difficult to get the SumoSpring in place with the axle not hanging.
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  • Should Spacer of Sumosprings Kit for 2018 GMC Sierra 1500 4x4 Be Used
    It is recommended that you use the included spacer with the SumoSprings kit part # SS45MR that you have installed on your 2018 GMC Sierra 1500. This allows the kit to engage at the appropriate point in your suspension travel to give you the support needed.
    view full answer...
  • Will SumoSprings Custom Helper Springs Fit 2018 GMC Sierra 1500 Denali With MagneRide Suspension
    The SumoSprings Solo Custom Helper Springs - Rear Axle # SS45MR are compatible with the MagneRide suspension on your 2018 GMC Sierra 1500. These have a 2,800 lb weight capacity and a microcellular urethane construction. The SumoSprings will be a great solution to help soften your ride while towing. They will help keep you level, absorb bumps and shocks, and also minimize sway. The # SS45MR features a no-drill installation and is maintenance free. These come with a limited lifetime warranty...
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  • 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...
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  • Which Sumo Spring Product for 2018 GMC 1500 Towing Up To 10,000 lbs
    Since the SumoSprings will be helping to support the trailer's tongue weight load, ideally you'll want to match the amount of support offered by the SumoSpring to the trailer's tongue weight. Since at most, the tongue weight of your dump trailer will be about 1500 lbs, worst case, I'd go with the 1500 lb capacity, part # SS95MR. When installed, the springs won't quite touch the rear truck axle, so they won't have any effect on your ride except when you're hauling items in the truck bed...
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  • Recommended SumoSprings for Hauling 1000 lb Round Hay Bales w/ 2007 Chevy Silverado 1500 Classic
    If a 1000 lb round bale is the heaviest thing you'll haul in the truck bed, I'd recommend going with the SumoSprings # SS95MR that you'd looked at, which would provide you a little bit of leeway in case the bales vary in weight a bit as the springs offer up to 1500 lbs of support per pair. If you'll occasionally haul items heavier than that, I'd go a step up in capacity with the # SS45MR which can support up to 2800 lbs. The SumoSpirngs are more pliable than other jounce spring replacements,...
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  • Will the SuperSprings Sumo Springs SSR-209-54 Also Fit on a 2020 Chevy Silverado 1500
    I checked with my contact over at SuperSprings and he tells me that the SumoSprings Solo Custom Helper Springs SSR-209-54 you mentioned- part # SS45MR -is not specifically designed for the new body style of the 2020 Chevy Silverado 1500 but will fit. This was also confirmed by our install team that it can be installed on your 2020 Silverado 1500; it's just not designed specifically for this truck as the # SS45FR and # SS65FR are. Depending on what you're towing or the size of the payloads...
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  • SumoSprings or Timbrens Which is Better for a 2018 Chevy Silverado 1500?
    I have a solution for you but adding the Timbren Suspension Enhancement System item # TGMRCK15MR to your 2018 Chevy Silverado 1500 is not a good idea. This system is typically only used on work body trucks or vehicles that are used exclusively for towing or hauling. The Timbren's will effect your ride quality when you are not towing your trailer and will provide a rough ridged ride. I recommend using the SumoSprings Solo Custom Helper Springs item # SS45MR. These springs have a 2,800...
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  • Comparing SumoSprings Solo Custom Helper Springs for a 2008 Chevy Silverado 1500
    There are three different SumoSprings Solo Custom Helper Spring options for a 2008 Chevrolet Silverado 1500. The difference is indeed weight capacity; part # SSR-209-40 for 1,000 lbs, part # SS95MR for 1,500 lbs, and part # SS45MR for 2,800 lbs. The part # SS95MR for 1,500 lbs would be a great option for your setup and what I recommend.
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  • Best Adjustable Suspension Enhancement For 2015 Chevrolet Silverado 1500
    The SumoSprings Solo Custom Helper Springs # SS45MR don't have any adjustments on them unlike the RoadActive Suspension Enhancement Kit # RAS4611 does. I would go for the RoadActive if it were me. Both of these will fit your 2015 Chevrolet Silverado 1500. For the best unloaded ride quality, the Sumo Springs would be best as they aren't activated until your suspension sags enough to make contact. The RoadActive option will always be engaged.
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  • Suspension Enhancement that Can Fit 2018 GMC Sierra 1500 with Lowering Shackles
    Since your lowering shackles change the distance between the rear axle and the truck frame you would not be able to use the # SS45MR for suspension enhancement as it would be too tall.
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  • Sumo Springs Helper Springs for a 2018 Chevy Silverado 1500 4WD w/ In Bed Camper
    I have a great solution for your 2018 Chevy Silverado 1500 4WD that will add support when you are using your truck camper but not stiffen your ride when going without it. It is the SumoSprings Solo Custom Helper Springs - Rear Axle item # SS45MR. These springs have a 2,800 lbs capacity and offer a progressive load control. Under lighter loads the springs compress easily at first for soft engagement and a less bumpy ride. Under heavier loads like when you are using your camper the springs...
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  • Will Rear Suspension Enhancement For 2006 GMC Sierra Prevent Bouncing When Towing Camper Trailer?
    The Timbren Rear Suspension Enhancement # TGMRCK25S will indeed help to fight the bouncing you are experiencing when towing your 3600lb camper trailer with your 2006 GMC Sierra 1500 2WD but I do not recommend going with this option. The reason for this is the # TGMRCK25S is rated for 6000lbs of weight which is way over the tongue weight of your trailer and as such you will have a very stiff loaded and unloaded ride. Instead I recommend going with the SumoSprings # SS45MR which have a 2800lb...
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  • Recommended Suspension Enhancement for 2015 Chevy Silverado 1500 With 6 Inch Lift
    With a 6" lift on your 2015 Silverado 1500 I recommend the RoadActive Suspension Custom Leaf Spring Enhancement Kit - Heavy Duty # RAS54FR. The SumoSprings # SS45MR are designed for stock height and would not be of any value with that lift. The RAS system attaches to your leaf springs so the lift won't impact their performance. This kit will eliminate axle wrap and wheel hop while reducing sway and body roll. The leaf springs adjust based on the vehicle load and have a 3,000 lb capacity....
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  • Recommended Suspension Enhancement For 2019 Chevrolet Silverado 1500 LD 4WD
    I recommend the RoadActive Suspension Kit # RAS54FR over the SumoSprings # SS45MR for your 2019 Silverado 1500 LD. The RAS is an active system so it is always providing the additional support to improve your ride. These will help keep you level while also eliminating axle wrap, wheel hop, and bottoming out. The kit will also improve your traction and prolong the life of your leaf springs, shocks, and tires. I'm not entirely sure how bad these roads actually are but it is possible to use...
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  • Recommended Suspension Enhancement for a 2000 GMC 1500 Sierra 2WD with a 3 Inch Lift
    As the SumoSprings # SS45MR are designed to be used with stock height vehicles, I do suggest going a different way. The RoadActive Suspension Custom Leaf Spring Enhancement Kit # RAS54FR will not be impeded by the lift on your vehicle. This is also rated up to 3,000 pounds and will definitely help with sagging while towing. This can also be used in unison with the Roadmaster Rear Anti-Sway Bar # RM-1109-176. This is, however, intended as a replacement/upgrade for a vehicle with a 1 inch...
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Info for this part was:

Employee Mike L
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Installed by:
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Employee Joshua S
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Test Fit:
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