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SumoSprings Solo Custom Helper Springs - Rear Axle

SumoSprings Solo Custom Helper Springs - Rear Axle

Our Price: $309.99
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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 SS95MR can be ordered online at or call 1-800-940-8924 for expert service.
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SuperSprings Intl Vehicle Suspension

  • Jounce-Style Springs
  • Rear Axle Suspension Enhancement
  • SuperSprings Intl
  • Light Duty

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.


  • 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): 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-209-47 SuperSprings Sumo Springs Solo Rear Vehicle Suspension Kit for Trucks

Item # SS95MR

Installation Details SS95MR Installation instructions

This Product Fits The Following Vehicles

Customer Satisfaction Score:

Customer Reviews

SumoSprings Solo Custom Helper Springs - Rear Axle - SS95MR

Average Customer Rating:  4.7 out of 5 stars   (1701 Customer Reviews)

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.


This is one of the best upgrades ever. The sumo springs were like adding pillows to the back. Took out the bad body roll and rear shock chatter from the factory junk rancheros. On my Sierra 1500 2017 z71. Easiest install and upgrade spent on this truck.


The Sumo springs engaged to early. The dwell between the axle, and the sumo spring is only half an inch. So unless the sumo spring is fully engaged, the truck bounces significantly every time we hit a bump. I would reduce the overall length of assuming spring by at least a half inch to allow time for the shocks to engage.


The installation was a bit slower as this was a 2002 GMC Sierra 1500 and the bump stop did not have the bolt in the hollow opening. Instead, the bump stop and cup came off by removing a nut between the bracket and frame. Access to that bolt is more difficult but doable with an open end wrench. Then use the provided spacer and in my case one washer, and the provided nut and bolt to secure the spacer. The Sumo spring then simply screws on. Both fit very well leaving a gap between the spring and Axle. This installation was on a quadrasteer Denali. Very pleased with etrailer's written instructions (although a video for this vintage truck would have been great) and their delivery time.


To rough of a ride, had to take them off. Wish I had sent them back.

I will have the manufacturer reach out to you.
-- Etrailer Expert Jenny N - 04/25/2022


Thay fit perfectly and work great!


Been 1 year great product, works

2014 Chevrolet Silverado 1500

Fits as advertised. Easy install. Easy transaction and a good company to do business with.

2007 Chevrolet Silverado New Body

Great product.

2017 Chevrolet Silverado 1500

missing some parts (2 off set plate) some far not good

Thank you for bringing this to our attention. Our customer service team should be reaching out in the near future.
-- Etrailer Expert Brooke M - 09/02/2021


2014 Chevrolet Silverado 1500





Review from a similar SumoSprings Solo in Vehicle Suspension

First off, these won't fix worn out suspension components, they are designed to improve ride quality by reducing sag/porpoising, especially on heavier vehicles.
Our 2010 Roadtrek 210P (75k miles) is a great rv but essentially a big heavy tub going down the road. Has the tendency to lean and wallow front to back. New shocks and all suspension is good, as mentioned make sure that stuff is all in good shape.
Pics show the oem stops vs the SS stops. Big difference - you may assume ride gets harsh but not the case. The oem stops were very tired and didn't do much. The preload on the new SS stops is just about perfect - any weight changes are very progressive which takes the harshness out of the ride. I didn't really see any change to ride height either.
Road manners are improved, there's a bit more resistance to lean, but the main difference is that the front end doesn't try to change height as readily with the back end.
Not a big deal to install. Youbdont need to pull the wheels, just turn them side to side to get to the stops. Pop out the old stops and clean the retaining cups with a wire brush and some brake clean. I used syl-glyde on the new stops to help get them into place. I also used a crowbar under the stop to push it into the cup while making sure the 4 tabs captured the top of the stop. Final step was to lower the van and give it a drive, then check to ensure the fit was good. The key here is to clean the cup first and use a bit of lube on the new stop.

Very pleased and I'll be installing SS on the back end soon. Yup, they're pricey but they are good quality with a limited lifetime warranty.

A year later, all is great. The SS on the front are solid performers, combined with an airlift airbag system on the rear and new coil springs on the front for a slight increase in ride height. Ride, stability and control are greatly improved.
Roadtrek - 01/05/2023


Review from a similar SumoSprings Solo in Vehicle Suspension

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.


Review from a similar SumoSprings Solo in Vehicle Suspension

Parts arrived on schedule. At first I thought that the parts did not fit my truck, so I called customer service and they immediately started to send me a return label and refund. It turned out that I was wrong, and the parts did fit. I called them back cancelled the refund action.
Great friendly service!
I also found that the price I paid was much cheaper than [online store]. I highly recommend etrailer!

The springs still work as they should. They are nice because they dont seem to affect the ride quality when the camper is not on the truck. Very happy with my purchase.
David B - 05/31/2022


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


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

Seems very robust. Looking forward to towing the trailer in the spring! Relatively easy to install, but thanks to a little [online] search, I was able to install them more easily. The steps for installation did not call for any lubrication of the top of the spring in order to get it into place, but it definitely needed it. I took multiple attempts to try and install them without and they simply wouldn't slip into place. I used a little bit of Simple Green in order to provide the lubrication that they needed to slip into place. It worked on the first attempt. OE bump-stops included in the picture next to the new Sumo Springs.


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!

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

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


Review from a similar SumoSprings Solo in Vehicle Suspension

I wish I installed these earlier on my Ram Promaster converted into a camper van, the improvement in stability, feel and peace of mind. No longer blown around in high wind, better towing for my boat, firmer feel just driving normal. Hard to describe all the benefits but for how reasonable they are priced and ease of installation certainly wish I had these day one when I bought the van. 100% will install these again on future vehicles and would definitely recommend this to any and everyone


Review from a similar SumoSprings Solo in Vehicle Suspension

I gave the SumoSprings an initial rating of 4-stars because they do work as advertised. During the first thousand miles I've driven since installing them on my 2019 Toyota 4Runner, I have noticed they contact the rear axle much sooner than the OEM bumper stops which serves to quickly increase the suspension's resistance to any further downward motion of the truck's body - which not only dampens excessive rear end "dipping" on rough terrain, but also works well to prevent any appreciable rear end squatting from the tongue weight of my heavy 2-axle utility trailer.

I reduced my initial rating by one star because, while they centered on the mounting bracket holes in the same manner as the OEM bumper, I wasn't able to center the SumoSprings over the rear axle even after pushing them as far forward as the elongated bolt holes would allow.

Since the center of the SumoSpring pad (midway in the adjustment range of the elongated bolt holes) is in exact vertical alignment as the center of the OEM bumper, the only explanation would be that the 4Runner's coil-spring rear suspension has a slightly arced rear-axle "full travel" range as it rises upward from the lowest to highest position. If that "full travel arc" moves the axle to its rearmost position when the suspension is at full compression (where it contacts the OEM bumper), the "full travel arc" would then move the axle about 1/2" forward during the downward portion of the arc back to the normal ride position.

Therefore, since the surface of SumoSpring's long cushion pad is very close to the axle when it's in the normal ride position, that would explain why the SumoSpring at its farthest forward adjustment position is still about 1/4" to the rear of being centered on the axle(even though the SumoSpring in that position is now a bit further forward from vertical center of the OEM bumper).

However, since the rear axle's upward travel moves it slightly to the rear (and more toward center-mass of the SumoSpring's cushion pad), perhaps it won't suffer any premature deterioration or failure - but only time will tell about the SumoSpring's durability and longevity.

Thank you for the detailed feedback. When the SumoSpring is installed you will want to position the bracket so that it is offset outboard towards the wheel. This product does have a limited lifetime warranty against defects.
-- Etrailer Expert Jenny N - 10/27/2021
After 70,000+ miles of both highway and off-road driving with and without a trailer in tow, I am upgrading my original rating to 5-stars because the bluemedium SumoSprings have performed exactly as advertised and show no signs of degradation in either wear, appearance, structural integrity or any noticeable deformation after being hammered unmercifully by the tongue-weight of the trailer I frequently tow along with the “moonscape” off-road terrain and even worse conditions of the roads I usually travel . Even though the SumoSprings still lacked ¼” from being perfectly centered on my 2019 4-Runner’s rear axle housing after installing them as far forward as their elongated slots would allow, my assessment of the suspension’s compression arc moving the third-member a bit to the rear on its upward swing proved to be true since the “shiny spots” of the contact points on the rear axle housing are well-centered. Unlike a Jeep Wrangler with an extremely stiff “hay-wagon” ride and having “no butt” or cargo space that protrudes more than a few inches past its rear wheels to strike the ground after traversing a sharp terrain -off, the largerlonger 4-Runner with a more comfortable ride has a lot of rear body protruding past its rear wheels – especially with a trailer hitch draw-bar attached. The 4-Runner’s hard-rubber OEM bumper stops allowed almost 5-inches of upward rear suspension travel before “bottoming out” which occasionally caused the underhung spare tire or hitch drawbar to contact the ground in extreme off-road terrain -offs or sudden roadway dips when towing a loaded trailer. However, the SumoSprings worked magic because there was only ½” clearance between them and the rear axle housing under normal conditions, and the rear axle housing gently touched the SumoSprings when the trailer was hooked up – which almost completely eliminated rear-end squat on a sharp off-road -off or sudden roadway dip without making the 4-Runner ride like a hay-wagon, farm tractor, 1950 International pickup with overload springs, Jeep Wrangler, etc. in the process. After another 250,000 miles or so, I’ll put SumoSprings on my next 4-Runner – good show guys!!!
Brent - 10/22/2022

Show More Reviews

See what our Experts say about this SuperSprings Intl Vehicle Suspension

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    For your 2014 Chevy Silverado 1500 towing a mid-sized, 6,000 lb travel trailer, the best SumoSprings for your application are going to be the 1,500 lb capacity SumoSprings Solo Custom Helper Springs # SS95MR. These will give you the right amount of compression so you get the best support possible without having a ride that would be too stiff like the higher-rated springs would give you.
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    Leveling out the front end of your 2016 Chevrolet Silverado 1500 will have no effect on the function of the SumoSprings Solo Custom Helper Springs item # SS95MR. The SumoSprings aren't under pressure and ride unloaded on your truck when you're not hauling so clearance isn't an issue. I have included a picture of these Sumosprings.
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    Image 1 for
  • SumoSprings or Timbren Kit for 2014 GMC Sierra 1500
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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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  • Correct SumoSpring Solo Helper Spring Fit for 2019 Chevy Silverado 1500
    For the 2019 model year, Chevy offered two different body styles for the 1500 Series Silverado, the Silverado 1500 (all new body style) and the Silverado 1500 Limited (old body style), which was mechanically and visually identical to the 2018 model. If you have the 1500 Limited, then the # SS95MR SumoSpring kit you'd looked at would indeed be a fit. If you have the all-new Silverado 1500, you'll want to use # SS45FR which offers 1500 lbs of support like the # SS95MR SumoSpring kit. The...
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    The SumoSprings Solo Custom Helper Springs # SS95MR will be a total of 6" in height once fully installed on your 2001 GMC Sierra 1500 if you use the 1/2" spacer that is included. With the 7-1/4" clearance you measured there will a 1-1/4" gap. Your vehicle would need to sag 1-1/4" before the SumoSprings would start to engage. According to SuperSprings, no additional spacers can be used with these SumoSprings. Instead of the SumoSprings, I recommend the RoadActive Suspension Custom Leaf...
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    I do have some other options for you but adding suspension enhancements to a vehicle will more often than not decrease ride quality as they are designed to prevent sag and in order to do so you must increase firmness which leads to a rougher ride. Furthermore, there are very few options for a 2018 GMC Sierra 1500 Denali due to the MagneRide suspension. It looks like you went with the SumoSprings Custom Helper Springs part # SS29EV which are engaged all the time. If you're looking for an...
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  • How To Fix Rough Ride with Timbrens On 2017 Chevrolet Silverado 1500
    The Timbren Rear Suspension Enhancement System part # TGMRCK15S is a great option to help reduce sag while towing with a 2017 Chevrolet Silverado 1500 but they do have a tendency to ride rough as the material is very dense. I think the perfect option for a compromise between support and comfort are the SumoSprings Solo Custom Helper Springs part # SS95MR. These ride much smoother than Timbrens and still provide support for towing or hauling.
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  • Troubleshooting Rear End Of Truck Bouncing When Towing Trailer W/ Fastway e2 Weight Distribution
    You should not be getting any bouncing in the rear of your 2018 Chevrolet Silverado 1500 when towing your 6000lb camper with 700lbs tongue weight with your Fastway e2 Weight Distribution Hitch. There are a few things I would check first before resorting to suspension enhancement. First what are the weight of the spring bars on your hitch? It is possible if you have an underrated system that it is not doing its job and causing the bouncing. Second I would go through and make sure the...
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  • Which SumoSprings Fit A 2002 GMC Sierra 1500 Denali With Qudrasteer?
    I reached out to my contact at SuperSprings and the correct SumoSpring for your 2002 GMC Sierra 1500 Denali with Quadrasteer is the SumoSprings Solo Custom Helper Springs - Rear Axle # SS95MR. This will give you 1400lbs of load leveling support when you are towing or carrying a heavy payload and will not affect your unloaded ride like other suspension enhancement options. I included a video of the # SS95MR for you to take a look at.
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  • Comparing Timbren, SumoSprings, and RoadActive System 2015 GMC Sierra 1500
    Between the SumoSprings and the Timbren kits for your 2015 GMC Sierra 1500 I'd go with the SumoSprings # SS95MR as the Timbrens are notoriously harsh when the truck is unloaded. That said the best option is the RoadActive Suspension kits like the part # RAS54FR for if you have a non-Denali or part # RAS2611 for if you do have a Denali with the Magneride. This gives you the support of the best systems out there while improving ride quality and stability so it's definitely the best option.
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  • How to Increase the Towing Capacity of a 2014 GMC Sierra 1500
    When considering increasing the towing capacity of your 2014 GMC Sierra 1500, there is something that you need to keep in mind. That is the fact that without serious upgrades to your engine and body, you cannot exceed the towing capacity of your hitch. However, it looks like the hitches made for your Sierra are rated for weight distribution systems. Using one of these can increase the load your vehicle can handle. For example, the Curt Class IV for your Sierra, part # C14006, has a tongue...
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  • Leaf Spring Reinforcement for a 2011 Silverado to Haul a 1400 Pound Ultra Light Truck Camper
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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
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Video Edited:
Jacob T
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Video Edited:
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Employee Wilson B
Updated by:
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Edited by:
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Test Fit:
David F
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