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

SumoSprings Solo Custom Helper Springs - Rear Axle

Our Price: $331.99
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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 SSR-307-47 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
  • Light Duty
  • SuperSprings Intl

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-307-47 SuperSprings Sumo Springs Solo Rear Vehicle Suspension Kit for Trucks

Item # SSR-307-47

Installation Details SSR-307-47 Installation instructions

This Product Fits The Following Vehicles

Customer Satisfaction Score:

Customer Reviews

SumoSprings Solo Custom Helper Springs - Rear Axle - SSR-307-47

Average Customer Rating:  4.7 out of 5 stars   (2172 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.


Did exactly as advertised. RV trailer rides smoother, headlights arent' blinding oncoming traffic because of lifting the front end. Excellent product.

2018 Ram 1500

When installing the springs I discovered that one of the mounting plates (1 out of 4) had 2 of the holes missed drilled and was unable to install. I had to send back to etrailer.

Etrailer Expert

Sierra K.


Sorry to hear about this defect. I see in your account that the manufacturer has provided you with a new mounting plate.

Dodge Ram Pickup

One year in, they are still terrific and make a world of improvement in the Ram spring suspension when towing.

Even our friends that follow us when traveling commented how much more stable our trailering is.

2014 Ram 1500

took about 45 mins to a hour to install mostly because of bolt up other wise probably 30 min install if bolt up was not in such a tight location. I did leave out the spacers which left me with about a 1 inch gap where as I had about 3 before install with OEM bump stops. I have not loaded a trailer on my truck yet but I did load around a 1000lb bail of hay right after install into the bed and you could not really see a drop in the back. Moment of truth will be when I load my travel travel which is the main reason I bought these due to sag. 2014 Ram 1500 4x4

2016 Ram 1500

Great product. Cured the sagging problem with my truck while towing my trailer.



Its working great. Leveled the truck and trailer perfectly.


At first SumoSprings worked well. I drove to Arizona pulling a 21 ft camper and stayed for six weeks. I stayed at several camp sites. I notice my truck was higher on the passenger rear side and the truck was slightly swaying when driving. I looked under the truck and saw that the rear driver SumoSpring was gone. I removed the the other SumoSpring and found that it was smashed on one side. I installed the Firestone coil-Rite air helper springs on 3/30/2023.

Dodge Ram Pickup

Really happy with the Sumo's on my 1/2 ton Ram. The stock Ram coil springs are a comfy ride and without the spacers that is maintained. Under a load the truck handles much better with a trailer or cargo. Installation was really easy and no maintenance is why I chose these over some other air springs.

2022 Dodge Ram Pickup

I received them on time. They appear to be good quality. Install was fairly easy, I recommend using a rachet wrench. The fit is good. I'll see how they work towing a trailer over the next couple days. My install was on a 2022 Ram 1500.


They are fine when pulling a trailer, help with squat well. However when not pulling the springs sit very close to the axle causing a hard ride especially on rough roads or pot holes.


Assembly went very well. I used the spacer and it actually raised the truck 1/2". After the camper was attached,the rear-end only dropped 3",much better than the 6 to 7" before.

Dodge Ram Pickup

It ruined the ride of my Ram when it’s not loaded.

Etrailer Expert

Jenny N.


We have had similar reviews about the stiffness of the springs when unloaded. For an alternative in the same price range that would not cause a terrible ride when unloaded I suggest part # F4130 for a 2021 Ram 1500. It installs in the coil springs and is an adjustable air bag. The load leveling capacity is 500 pounds so it is on the lighter side.

2023 Ram 1500

This is the 2nd truck I have pit them on. Excellent product and I would recommend these to anyone who uses a truck like a truck.


Great ride, extra support with rv on hitch, much more comfortable, smoother ride then the previous timbrens

Dodge Ram Pickup

I pull a 24 ft trailer w/ one slide out. It weighs roughly 5K (more loaded). My RAM 1500 is well balanced for the tongue weight and , of course, when not pulling, the truck drives as if the sumos were not there-which they are NOT when the weight comes off. I have noticeably more control overall. Glad to have purchased these.

They were installed by Dodge dealership--no issues. A great product.

Dodge Ram Pickup

They definitely stiffen the suspension on this ‘22 Ram 1500. I used the 1” extension plate and will try it out pulling my aluminum horse trailer with 1 horse. I may remove the extension if the stuff ride gets uncomfortable.
A couple of bolts were hard to get to. Took about 2 hours and some cussing to install.

2015 Dodge Ram Pickup

On a 2015 Ram 1500. The Sumo springs work great. I went from a loaded ride height of 35 inches to 36 1/4 inches. But the real improvement is in the ride. No longer have the squishy rear end wobble that I used to have. Combined with my weight distributing hitch my ride height improves to 37 1/2 inches. Truck is level along with my travel trailer. When I'm not loaded I don't even notice that I did anything. Still rides like factory. My only complaint is in the installation. Eight nuts with washers per spring and there is no space at all on multiple nuts to fit a so met or even a ratcheting wrench. Took about an hour in my driveway. Other than this minor inconvenience, I have to say excellent product.

2015 Ram 1500

I should of gotten airbags.
I bought
these in hope of making towing my camper feel more stable and I was let down big time. These did not help in towing and in fact made towing worse. I had a neighbor that thought these were awesome when he got them for his truck but he has also since gone with air bags. My truck didn't handle very well with or without towing and I had to remove them.
I still do not have air bags but I also haven't had time to camp. So, once camping picks back up I will be buying air bags.


A year later the SumoSprings did exactly as advertised. I am pleased with the product and the service I received from Etrailer

Dodge Ram Pickup

The Sumo Springs worked as advertised. Installed them on a 2021 Ram 1500 Big Horn 4x4. I had to install them with a wrench, the socket set didn’t have enough clearance. Took a little bit of time and patience but got them installed. I pull a travel trailer with a 600 lb tongue weight. Towing the trailer was smoother and dampened the rear bouncing when going over rough spots on the road. I would recommend this product.


The SuperSpring Solo work as advertised. They definitely help level the load when pulling my 27' camper. My only complaint is that they fit so tight (1/4" gap) between the bottom of the SuperSpring and the axle that as soon you load anything you are already using the SuperSpring. I would have preferred a little more of the oem suspension for day to day driving.

2019 Ram 1500

Supports the hitched ride fantastically. Unhitched is a bit bouncy but not terrible.


Did not work took them off sitting on my shelf. Had to by air bags

Dodge Ram Pickup

This product does what it says it will do. One of the issues that I have is the difficulty to install this product. The 2020 Ram 1500 on the passengers side has a stabilizing bar that interferes installing all the nuts on the rear of the mounting plate spring. My truck supposedly has a 1 inch lift from the factory (Big Horn North Edition). I used the plastic extension as recommended in the installation instructions and even with the 1 inch factory lift, using the plastic spacer makes the spring rest on the rear axle with no load in the truck. I'd recommend to not install with the plastic spacer. The ride is much stiffer but I'm OK with that as when my trailer is attached the ride is as expected.


They are great I pull fifth wheel around and lot of bumper pull trailers and they have been a life saver when comes to steering and handling the heavy loads


I originally ordered springs and then thought I would call about them. I talked to Emily. She was very knowledgeable and told me I ordered the wrong springs. She steered me to the Sumo springs and explained why I would prefer them. She was right on target. She took care of all the details, switching for the sumos. The Sumos are a perfect fit and exactly what I wanted! The discussion was very helpful. Thank you Emily!! I’ve bought several other items from etrailer and been happy with all purchases.

Show More Reviews

See what our Experts say about this SuperSprings Intl Vehicle Suspension

  • Recommended SumoSprings for a 2021 Ram 1500 Pulling a Travel Trailer
    Thanks for the picture! For your 2021 Ram 1500 I recommend the SumoSprings Solo Custom Helper Springs item # SSR-307-47 over an air bag system. These 1,500 lbs capacity springs have a progressive load control. Which means the springs compress according to the weight of your trailer or cargo in the bed. When you are not towing or loaded down you won't notice they are installed. Under a heavy load these springs will compress by as much as 80% to support your suspension and keep your truck...
    view full answer...
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  • Recommended Suspension Enhancement For 2022 Ram 1500 TRX Towing Gooseneck Trailer
    To reduce the squatting you're experience while towing I recommend the SumoSprings Solo Custom Helper Springs # SSR-307-47. These will provide you with additional support and will help keep you level while reducing sway. They also have a minimal impact on unloaded ride quality. They feature progressive load control so the springs compress according to the weight of your cargo. They have a weight capacity of 1,500 lbs and a microcellular urethane construction to hold up to the elements....
    view full answer...
  • Timbren or SumoSpring Kit for 2022 Ram 1500 Big Horn Crew Cab
    If you value your ride quality at all I would recommend the SumoSprings like the part # SSR-307-47 which has the 1,500 lb capacity. This will give you the support you are wanting without destroying your ride quality which the Timbrens are more known for.
    view full answer...
  • Ride Comfort for SumoSprings When Unloaded
    The SumoSprings Solo Custom Helper Springs item # SSR-307-47 have a 1500 lbs capacity whereas the SumoSprings Solo Custom Helper Springs item # SSR-307-40 have a 1,000 lbs capacity for lighter towing and hauling applications. Both are designed to offer a stable ride when your 2019 Ram 1500 Classic is loaded down or towing a heavy load. The SumoSprings are by far the most ride comfortable jounce style springs available. There would be minimal difference if any at all when unloaded. They...
    view full answer...
  • Best SumoSprings For 2022 Ram 1500 Towing Camper Trailer
    The best option for SumoSprings for your 2022 Ram 1500 for towing a camper trailer are the 1,500 lb capacity springs, with the correct fit for your truck being the following: - SumoSprings Solo Custom Helper Springs # SSR-307-47 The reason why the # SSR-307-47 are the best for your '22 Ram for towing a camper is because they have enough capacity at 1,500 lbs to give your suspension the support it needs and won't provide a stiff ride like the higher-rated springs can. The 1,000 lb SumoSprings...
    view full answer...
  • SumoSprings Helper Spring Recommendation for 2022 Ram 1500 Classic
    We offer two SumoSprings options for your Ram 1500 Classic. For 1000 lbs of support, use the # SSR-307-40 kit you'd looked at. For up to 1500 lbs of support, use # SSR-307-47. Either kit is compatible with in-bed 5th wheel or gooseneck hitches. If you click the provided link, you can see an install video.
    view full answer...
  • Which SumoSprings Kit for 2020 Ram Rebel 1500
    We have two SumoSpring options that fit your 2020 Ram 1500 Rebel with the tow package. We have the part # SSR-307-47 which can provide up to 1,500 lbs of additional support or we have the # SSR-307-40 which can provide up to 1,000 lbs of support. Since you will be on the higher end of your towing capacity the better option would be the 1,500 lb # SSR-307-47. Unlike other options (Timbren specifically) the SumoSprings aren't nearly as harsh so the higher capacity kit won't make your daily...
    view full answer...
  • Recommended Solution to Fight Sag When Towing in a 2021 Ram 1500
    The SumoSprings Solo Custom Helper Springs - Rear Axle # SSR-307-47 you were looking at are a really nice solution to help fight the sag you're experiencing and they'll also help with road shock to help smooth out your ride a bit. I really like the SumoSprings compared to an air bag since they're maintenance free and you don't need to add a compressor to get the most out of the system. SumoSprings are progressively load bearing, so they'll get stiffer as more weight is applied on them;...
    view full answer...
  • Custom Helper Springs For A 2019 Ram 1500
    The SumoSprings Solo Custom Helper Springs # SSR-307-47 has a higher weight capacity being at 1,500 pounds and The SumoSprings Springs # SSR-307-40 have a 1,000 weight capacity. The # SSR-307-47 will be your best bet on your 2019 Ram 1500. The sumo springs have a simple, no-drill installation and will work in temperatures from -25 degrees F to 200 degrees F. Using the Sumo Springs will not increase your vehicle's weight-carrying capacity. I attached an installation video link below.
    view full answer...
  • Recommended Rear Axle Jounce Spring Kit for 2017 Ram 1500 4x4 Quad Cab
    Air bags kits are a better option when your trailer or cargo load varies a lot, especially with an uneven cargo load, but for towing one trailer that is more or less uniformly loaded up each trip I recommend jounce springs. Jounce springs will give you progressive rear axle support when you need it but they will otherwise not affect your ride quality. They also cost less than air bag systems, are much easier to install, and they require no maintenance. Since most of your trailer's 5900-lb...
    view full answer...
  • Will SumoSprings Part # SSR-307-47 Interfere with Factory Air Suspension on a 2018 Ram Rebel 1500
    The SumoSprings Solo Custom Helper Springs part # SSR-307-47 will physically ft onto your 2018 Ram 1500 Rebel however, the factory air suspension system will likely interfere with the jounce springs. SuperSprings states that when they tested the SumoSprings on a model with air suspension, the air suspension system had problems while trying to lower the truck. Unfortunately, all of the other suspension enhancements we have for your vehicle will run into the same issue listed above.
    view full answer...
  • SumoSprings Recommendation for 2016 Ram 1500 Big Horn
    Yes, I would recommend the SumoSprings kit part # SSR-307-47 for your 2016 Ram 1500 Big Horn. This will do a great job reducing the sag of your truck when towing your fifth wheel.
    view full answer...
  • What Rear SumoSprings Fit My 2022 Ram 1500 Rebel?
    For your 2022 Ram 1500 Rebel, I recommend the SumoSprings Solo Custom Helper Springs - Rear Axle # SSR-307-47. These springs fit both 2-wheel and 4-wheel drive 1500s and help keep your vehicle level during transport. The springs provide you with 1,500 pounds of load-leveling capacity to help absorb bumps and shocks. Another great feature about the SumoSprings is that they do not require any additional maintenance once they are installed. The installation involves a simple, drill-free installation...
    view full answer...
  • Recommended SumoSprings For My 2021 Ram 1500 Rebel
    I recommend the SumoSprings Solo Custom Helper Springs - Rear Axle, part # SSR-307-47, for your 2022 Ram 1500 with the Rebel trim. These SumoSprings are compatible with a 4X4 vehicle, such as your 2022 Ram 1500 Rebel. These SumoSprings have a 1,500 lb capacity. Please keep in mind, adding SumoSprings will not increase your vehicle's weight capacity. I have included product description links and an installation video link below.
    view full answer...
  • Suspension Enhancement Recommendation for 2020 Ram 1500 Big Horn
    For additional support that won't hurt the unloaded ride quality of your 2020 Ram 1500 you'd want the SumoSprings kit part # SSR-307-47 which will do a great job getting rid of the suspension sag of your truck when towing your camper.
    view full answer...
  • Suspension Enhancement to Work With Coil Springs on a 2017 Ram 1500 Regular Cab
    The SumoSprings Solo Custom Helper Springs # SSR-307-47 are designed to be used with coil springs on your 2017 Ram 1500. These will help your truck stay level when under a heavy load.
    view full answer...
  • Best Suspension Enhancement Kit for 2020 Ram 1500 that Isn't Too Harsh
    The SumoSprings kit part # SSR-307-47 is the perfect suspension enhancement kit solution for your 2020 Ram 1500 as it provides a smoother ride quality than other similar kits and also is a jounce style spring and not an air spring as well. This kit provides the best blend between support and ride quality of all of the options out there so it's your best solution.
    view full answer...
  • Timbrens or SumoSprings to Help Out with Sag on 2022 Ram 1500
    I usually recommend going with the SumoSprings like part # SSR-307-47 for your 2022 Ram 1500 mainly because most people complain that the unloaded ride of Timbrens is too harsh and uncomfortable. From our experience and the reviews that we've gotten back, the SumoSprings are a great alternative. They still help out when your truck is under a load but you will hardly notice they are there when you aren't under a load. Attached is an installation video on a 2013 Ram 1500 for you to check out.
    view full answer...
  • Can I Use SumoSprings with a Weight Distribution Hitch?
    Yes, you absolutely can use the SumoSprings Solo Custom Helper Springs Item # SSR-307-47 with a weight distribution system. Those springs were designed for exactly the type of issue you are encountering. These will keep your 2019 Ram 1500 Classic level when you're towing your RV. You can use them with a weight distribution system but you may not need to unless you're also needing it for sway control. I recommend hauling with and without the weight distribution system connected after you...
    view full answer...
  • SumoSpring Kit Recommendation for 2024 Ram 1500
    Yes, we have the SumoSprings kit part # SSR-307-47 that are a confirmed fit for your 2024 Ram 1500. These will do a great job of balancing ride quality and additional support that will get rid of sag when towing your travel trailer.
    view full answer...
  • Suspension Enhancement Recommendation for 2018 Ram 1500
    For your 2018 Ram 1500 the low maintenance suspension enhancement kit I recommend is the SumoSprings Solo Custom Helper Springs - Rear Axle # SSR-307-47. These springs will install by replacing factory bumpstop and will only engage to the capacity needed to level your ride. Air spring kits are a lot of maintenance and have a more in-depth install since you have to run air lines but the SumoSpring kits installs easily and you never have to worry about it again. We've also seen that the ride...
    view full answer...
  • Recommended SumoSprings for Rear Sag on 2022 Ram 1500
    The SumoSprings Solo Custom Helper Springs # SSR-307-47 are a great choice and I would highly recommend them. These have a 1,500 lb weight capacity and will help keep you level while towing or hauling with your 2022 Ram 1500. The feature progressive load control and also work independently to help reduce body roll and compensate when loads are off-center. The SumoSprings have a microcellular urethane construction and are completely maintenance free unlike air bags. They have a bolt on...
    view full answer...
  • 2013 Ram 1500 Towing Capacity and Suspension Enhancement
    The length of a trailer isn't the issue as long as it remains under your max towing capacity weight. You shouldn't have any issues with a 24 foot trailer as long as it is under the weight capacity. To reduce any sag from the trailer, I recommend the SumoSprings Solo Custom Helper Springs - Rear Axle # SSR-307-47 which is a custom fit for your truck, easy to install, and maintenance free. These will help your factory suspension with support and will also help with stability by helping...
    view full answer...
  • Suspension Enhancement Recommendation for 2017 Ram 1500 Towing 5th Wheel
    The best suspension enhancement option we have for your 2017 Ram 1500 would be the SumoSpring kit part # SSR-307-47 which will give you the support you are needing to reduce sag, is maintenance free, and unlike other options isn't super harsh.
    view full answer...

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Info for this part was:

Employee Leah B
Edited by:
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Expert Research:
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Employee Adam R
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Employee Jeffrey L
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Video by:
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Employee Dustin K
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Employee Chris R
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Installed by:
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Written by:
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