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  1. Vehicle Suspension
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SumoSprings Solo Custom Helper Springs - Rear Axle

SumoSprings Solo Custom Helper Springs - Rear Axle

Item # SS45MR
Retail:$825.70
Our Price: $336.99
You Save: $488.71
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. Great Prices for the best vehicle suspension from SuperSprings Intl. SumoSprings Solo Custom Helper Springs - Rear Axle part number SS45MR can be ordered online at etrailer.com or call 1-800-940-8924 for expert service.
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SuperSprings Intl Vehicle Suspension - SS45MR

  • 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 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.


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   (2182 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:
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.



by:

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!



by:

I haul my side by side in my truck and sumo springs make a huge difference with that much weight! Very easy to install.



by:

Could you please put the instructions in?
Yes
it is a simple job but the instruction would help with the details.
Like, what to do with all those washers.

Thank you



by:

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.



by:
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.



by:
2012 GMC Sierra

Won't know until i get them installed



by:
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



by:
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.



by:

Absolutely awesome



by:
2017 Chevrolet Silverado 1500

Josh helped me tremendously on proper installation upon my request



by:
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



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2018 Chevrolet Silverado 1500



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2012 GMC Sierra



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2016 Chevrolet Silverado 1500



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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:

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:

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:

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:

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.


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See what our Experts say about this SuperSprings Intl Vehicle Suspension

  • Can SumoSprings Solo Custom Helper Springs Be Installed On A Truck With A Suspension Lift
    The SumoSprings Solo Custom Helper Springs # SS45MR simply replaces the factory bump stops so you wouldn't have an issue with a lifted truck. If the space between the frame and axle increased due to the lift then the springs just wouldn't engage as soon.
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  • Will SumoSprings Fit 2017 GMC Sierra 1500 Denali With MagneRide Suspension
    The SumoSprings # SS45MR are compatible with the MagneRide suspension on your 2017 GMC Sierra 1500. These have a 2,800 lb weight capacity and a microcellular urethane construction. The SumoSprings are a great solution to help keep you level while towing. They also absorb bumps and shocks while minimizing sway. The # SS45MR features a no-drill installation and is maintenance free. These come with a limited lifetime warranty and are made in the USA. I have attached an installation video...
    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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  • Recommended Suspension Enhancement For A 2015 Chevrolet Silverado 1500
    I recommend the SumoSprings Solo Custom Helper Springs # SS45MR for your 2015 Chevrolet Silverado 1500. I like this springs over the others that we offer because they're maintenance free and have no tubing to run or air pressure to monitor like you do with the air springs. The SumoSprings have a weight capacity at 2,800 pounds, and will work in temperatures from -25 F to 200 F. I linked an installation video below of the SumoSprings being installed onto your exact vehicle. If you have...
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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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    Image 1 for
  • 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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  • 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...
    view full answer...
  • 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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  • Recommended Rear Suspension Enhancement for a 2021 GMC Sierra 1500 AT4
    There is a set of SumoSprings that fit your 2021 Sierra 1500 AT4 but item # SS45MR do not fit. The ones that fit are item # SS45FR. These have a slightly lower capacity at 1,500 lbs but will fit so long as your truck doesn't have the adaptive ride control option. I have a completely different system I would recommend you use. Since your 1500 AT4 has a 2" lift from the factory, SumoSprings will not be the best way of supporting your truck's rear suspension. The kit comes with a 1" spacer...
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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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  • 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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  • 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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  • Best Suspension Enhancement for 2016 Chevy Silverado 1500 Towing Trailer
    If you are looking for the best suspension enhancement for your 2016 Chevy Silverado 1500 to provide additional support when towing a trailer you'd want the RoadActive Suspension kit part # RAS4611. The reason this is the best option is that it gives you the support you are wanting, improves stability when towing, and also improves ride quality whereas the other options are going to make the ride quality rougher and not offer the same improvements in handling/stability. If you were going...
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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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  • 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.
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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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  • 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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  • Suspension Enhancement Recommendation for 2018 Chevy Silverado 1500 Towing Travel Trailer
    For what you are looking for the best suspension enhancement kit for your 2018 Chevy Silverado 1500 would be the Roadactive part # RAS54FR which is easy to install, gives you adjustable support, and unlike other options improves the ride quality instead of making it harsher and also improves handling and stability loaded and unloaded. Its by far the best option.
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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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    Yes, we have the Demco Composite eZ-Latch Repair Kit # DM6288 that will replace the eZ-latch on Demco 2-5/16" cast couplers like that which comes on the Demco Hydraulic Brake Actuator # DM8104311.
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  • Suspension Enhancement for Pulling a Travel Trailer With a 2012 Chevrolet Silverado 1500
    If you are only needing the suspension enhancement for pulling a travel trailer with your 2012 Chevrolet Silverado 1500 I wouldn't recommend any. You will be much better off going with a weight distribution hitch with sway control. The weight distribution hitch will better distribute the weight across your truck giving you a level ride. It is also adjustable so it can be fine tuned for your truck and trailer, and can be moved to different trucks and trailers if you decide to make a change....
    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 by:
Joshua S
Employee Jonathan Y
Video by:
Jonathan Y
Employee Jacob T
Video Edited:
Jacob T
Employee Chris R
Video Edited:
Chris R
Employee Wilson B
Updated by:
Wilson B
Employee Daron K
Edited by:
Daron K
Employee David F
Test Fit:
David F
Employee Ryan G
Test Fit:
Ryan G
Employee Kevin C
Test Fit:
Kevin C
Employee Alex H
Written by:
Alex H

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