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

SumoSprings Solo Custom Helper Springs - Rear Axle

Item # SSR-329-47
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Vehicle Suspension

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Vehicle Suspension SSR-329-47 - Standard Duty - SuperSprings
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2,200-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. SumoSprings Solo Custom Helper Springs - Rear Axle part number SSR-329-47 can be ordered online at etrailer.com or call 800-298-8924 for expert service.
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SuperSprings Vehicle Suspension - SSR-329-47

  • SuperSprings
  • Jounce-Style Springs
  • Rear Axle Suspension Enhancement
  • Standard Duty

2,200-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
    • Support heavy rear loads to keep your vehicle level
    • 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): 2,200 lbs
    • SumoSprings will not increase your vehicle's weight-carrying capacity
  • 2-Year limited warranty


Rear Suspension Support

A heavy rear load can cause 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-329-47 SuperSprings Sumo Springs Solo Rear Vehicle Suspension Kit

Replaces SSR-325-47

Installation Details SSR-329-47 Installation instructions

This Product Fits The Following Vehicles




Video of SumoSprings Solo Custom Helper Springs - Rear Axle

Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.




Video Transcript for SumoSprings Solo Custom Helper Springs Review

Speaker 1: Today, we'll be taking a look at the SumoSprings Solo Line of Custom Helper Springs for the rear axle. You'll want to use eTrailer's fit guide to determine the correct kit for your vehicle. This is what our SumoSprings look like when installed. Yours may look a little different depending on your vehicle.They're gonna replace our factory jounce stops and sit right between our frame and our rear axle. So whenever we're carrying a heavy load, they're gonna give us that extra support that we need. The way our SumoSprings are gonna work is when our suspension starts to sag from the heavy load, these are gonna absorb a lot of that weight.They are gonna work independently from each other so it's gonna help with those off-center loads.

Our springs are gonna have a progressive rate to 'em. So if we have a light load, they're gonna compress softly, still giving us that comfortable ride. But the heavier load we put on 'em, the more they're gonna compress and the more firmness they're gonna have to them.Now comparing to our factory jounce stop, you can see there's a big difference in height. These are gonna give us a lot more compression, whereas our factory jounce stops are really just preventing the axle from hitting the frame.We have a water tank at the bed of our truck as a heavy load or to simulate the tongue weight of a heavy trailer or a fifth wheel. So as I take the truck through my test course, I can definitely tell that there's a load back there.

The engine doesn't seem to be strained that much, but the bumps are extremely harsh and I can definitely feel it resonating through the seat.When I come to the slalom course and I'm going through the turns, it definitely has a lot of body roll and I just generally feel like I need to slow down because it feels likes it's leaning a lot and it's not responding quickly enough to the turns.Now that we have our SumoSprings installed and I have the same load back there, when I'm driving through our course, I can immediately tell a difference. It's much of a smoother ride. Going over the bumps really doesn't feel like anything's back there and it's just a lot more comfortable.When I come into the slalom course, it definitely feels a lot more stable and it doesn't seem to sway as much side to side and it just generally feels like it wants to go faster.These are made of a durable micro cellular urethane that works in temperatures from -25 degrees to 200 degrees Fahrenheit, and resists damage caused by oils, road salts and UV rays. Compared to air bags, these are maintenance free option with no tubes to run or air pressure to maintain. Both will help level your load and provide a smoother ride.

Airbags can be adjusted to suit your needs whereas the SumoSprings are a fixed option.That completes our look at the SumoSprings Solo Line of Custom Helper Springs for the rear axle.


Customer Reviews

SumoSprings Solo Custom Helper Springs - Rear Axle - SSR-329-47

Average Customer Rating:  4.7 out of 5 stars   (478 Customer Reviews)

2,200-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.

- SSR-329-47
by:

Graeme product easy to install 717170



- SSR-329-47
by:
Mercedes-Benz Sprinter

Rebecca knows her stuff. I gave a request on a Mercedes Sprinter van for our son AND on my Mercedes Winnebago camper and she got both of them correct. The order arrived almost overnight. I trust her. 539469



- SSR-329-47
by:

What a great alternative to having to worry about the air bags all of the time!! 614637



- SSR-117-47
by:

Review from a similar SumoSprings Solo in Vehicle Suspension


Very easy to install. Normal ride unless loaded and ride is smooth, even then. Helps with porpoising when hauling a heavy tongue weight. 658065


Comments
Pulling my camper is no longer a “ white knuckle “ experience. These are a no brained if you have a 12 ton pickup and carry heavier loads.
Larry - 06/15/2020

80914

- SSR-338-54
by:

Review from a similar SumoSprings Solo in Vehicle Suspension


These work exactly as stated on my 2018 sprinter class C. They do not make the ride harsh at all. The yellows combined with an upgraded sway bar helped stop the sway of coming out of a driveway tremendously. Sway from wind and being passed by trucks was also greatly reduced. The addition of upgraded shocks make it so that I can drive one handed the majority of the time now. Recently had the chance to test these in a long run of coastal highway one in northern CA, they made the extremely windy road a pleasure to drive, even with the bad road conditions. Only scored a 4 and not a 5 because they do not solve all of the issues by themselves, but are an integral part of a total solution. 663600


Comments
One year later Ive since upgraded the front suspension as well and Im still loving the ride. The idea of driving in adverse conditions no longer impacts trip planning.
Biz - 06/28/2020

83361

- SSR-338-54
by:

Review from a similar SumoSprings Solo in Vehicle Suspension


Not only are the products sold by etrailer great quality but the prices and service can't be beat. One of the best places to shop online 759089



- SSR-307-47
by:

Review from a similar SumoSprings Solo in Vehicle Suspension


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. 764466



- SSR-130-54
by:

Review from a similar SumoSprings Solo in Vehicle Suspension


Front & Rear Sumo Springs Just installed the Sumo Springs I ordered and oh WOW!!!!! That is the finishing touches to my suspension on my 32 ft Class C on an E450 chassis and love the results. Bought our coach a year ago and installed Hellwig sway bars ( front & Rear ) Bilstien shocks and Safe T Plus Steering control and that made a huge difference to drivability but then decided to add Sumo Springs, Oh My Goodness with all that I’ve done our coach drive down the highways and byways rock solid. The sumos weren’t to difficult to install considering this ole man has had 3 back surgeries and 2 bad knees but we got it done and I was blown away on the test drive. I highly recommend the Sumo products. 641292


Comments
Still love the Sumos, they do their job. Class C is so much more a pleasure t drive even in wind and large semi trucks passing by, barely a wiggle. I would highly recommend these on any motorhome
Joseph - 05/13/2020

76407

- SSR-209-40
by:

Review from a similar SumoSprings Solo in Vehicle Suspension


Installed in 10 min. Easy install.Have not tried them yet.Boat is at the dealer.Will know when I pick it up. 692446



- SSR-130-54
by:

Review from a similar SumoSprings Solo in Vehicle Suspension


SumoSprings really improved the ride on my 2018 Thor Axis 24.1 It is much easier to drive the twisty roads in the mountains with this product because the motorhome does not lean as much. 610794



- SSR-117-47
by:

Review from a similar SumoSprings Solo in Vehicle Suspension


Went from air springs to these and much more happier with the ride and simplicity of these over the air bags. 735203



- SSR-307-47
by:

Review from a similar SumoSprings Solo in Vehicle Suspension


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. 347254



- SSR-307-47
by:

Review from a similar SumoSprings Solo in Vehicle Suspension


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. 660605



- SSR-307-47
by:

Review from a similar SumoSprings Solo in Vehicle Suspension


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. 674123



- SSF-106-47
by:

Review from a similar SumoSprings Solo in Vehicle Suspension


Great product. Very easy to install. I installed Sumo springs front and rear on my class C Sprinter-based RV (Winnebago View) as part of a suspension upgrade to improve handling in cross winds. The other suspension upgrades included a Hellwig rear sway bar and Bilstein rear shocks. The handling improvement was dramatic. No more sway when being passed by semi’s and much, much better handling in cross winds. I am very happy with the Sumo springs. 656765



- SSR-117-47
by:

Review from a similar SumoSprings Solo in Vehicle Suspension


Excellent addition to the truck and easy to install. Greatly reduces squat when pulling the RV and eliminates rear end hop when going over bumps with no load. 756809



- SSR-209-40
by:

Review from a similar SumoSprings Solo in Vehicle Suspension


I Received the SumoSprings Solo Custom Helper Springs shipment today and installed them on my 2017 Chevy Silverado 1500 standard cab long bed truck. It took about 30 minutes to install the helpers springs. I watched the install video and read the installation instructions on the etrailer website while waiting for the shipment to arrive. They were easy to install without jacking up the truck, I laid flat on my back and slid under the truck on my garage floor and had no problems at all. After installation I hooked up my 20 ft travel trailer and went on a test drive. The helper springs made a big difference and gave a more solid stable performance with the truck while towing my 5,000 lb travel trailer. I've installed airbags on previous trucks and I believe for the money and easy installation this is the best option to improve towing performance. 725590



- SSF-106-40
by:

Review from a similar SumoSprings Solo in Vehicle Suspension


Super fast shipping and delivery. Had them installed this morning and we're enjoying a better ride with less sway in cornering and curb transitioning. Installed on a Sprinter chassis, B+ touring van. 668030



- SSF-106-47
by:

Review from a similar SumoSprings Solo in Vehicle Suspension


Can’t eat Etrailer products and service 559621



- SSF-106-40
by:

Review from a similar SumoSprings Solo in Vehicle Suspension


These were perfect for our E450 Dynamax Class C motorhome. They really enhanced the ride and handling. I would definitely purchase again. 718740



- SSR-610-40
by:

Review from a similar SumoSprings Solo in Vehicle Suspension


Purchased for a Tacoma 4 dr, long bed, with a fiberglass cap. I have the TSB/recall replacement spring pack. With this set up I had a decent ride, and better support over the OEM springs, but still see that the springs provided only minimal improvement when loading in the bed say 300-500#. If so loaded (camp gear, MC gear, 2-3 persons in cab) on moderate unpaved roads the OEM springs were at max load and had we too much frame sag. WITH the addition of the SumoSpring kit I found my truck when UNLOADED handled the same, but did have less body roll in the rear. At rest the frame rail is just touching the SumoSpring and wheel well to ground is 36 1/2" with P245 tires. When LOADED as detailed above, the rear feels firmer, has less body roll, and does not sag to excess like the OEM spring pack. Very satisfied with results. A very nice enhancement at a excellent price point. Kit is simple to install and should require no regular service/adjustment. 353831



- SSR-210-40
by:

Review from a similar SumoSprings Solo in Vehicle Suspension


They really make a difference. I have a truck load of tools and was it really noisy hitting bumps etc. They are a must have! 612257



- SSR-130-47
by:

Review from a similar SumoSprings Solo in Vehicle Suspension


Installing these babies in the morning. Very pleased with this product. 707679



- SSF-202-47
by:

Review from a similar SumoSprings Solo in Vehicle Suspension


Product appears to dampen front end response so far to hard bumps. I definitely rate the install on these things LOWER than POOR. The instructions lead you to believe that you can simply twist and push these in place. This is not the case for the home mechanic with a floor jack. I had to take the truck to a mechanic and he threw all kinds of muscle, people, pry bars, and other items at these to get them to seat properly. Once in, they appear to function as intended. I would suggest you consider the fact that you may need outside assistance when installing these things. 559218



- SSR-210-40
by:

Review from a similar SumoSprings Solo in Vehicle Suspension


2009 Chevy Colorado 4x4. Leaf springs were getting a bit weak and $600+ to replace with a set of overload springs, so I found this. Even empty, a rough road would knock your fillings out of your teeth, so I thought I would take a chance on these. I was a bit worried about breaking a bolt getting the old bump stops off since I live in rust country and the truck is 10 years old. But came right off and the new ones installed quickly. I had removed wheels since I was also putting on a new set of Bilstein shocks on the rear. The urethane seems to be a pretty tough material that should hold up well. I did need to jack up the body of the truck about a half inch to provide the necessary clearance since the Sumosprings are significantly taller than the factory bumpstops. Even with a 1000 lb load, the truck rides smoothly over the worst of bumps, without the teeth-rattling "ker-chunks" of driving over a rough road. Delivery was fast, as usual with e-trailer.com. I am considering a set for my Chevy 3500 to tame the rear end on that when traveling unloaded... 633668


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Ask the Experts about this SuperSprings Vehicle Suspension

  • SuperSprings Rear Helper Springs on 2016 Mercedes Sprinter 2500 are Not Engaging
    Having that slight gap between the new SuperSprings # SSR-329-47 and the platform they make contact with is common not just with this brand but with others as well. It allows your suspension to compress some so as not to have too much of an effect on the unloaded ride quality. Since the springs are not engaging at the rear of your 2016 Mercedes Sprinter 2500 that means that the factory suspension is not compressed enough. And that means that the amount of weight you have in the van...
    view full answer...
  • Correct SumoSprings for a 2006 Roadtrek SS Agile on a Dodge Sprinter 2500 Chassis
    The correct SumoSprings Solo Custom Helper Springs for your 2006 Roadtrek SS Agile on a Dodge Sprinter 2500 Chassis is part # SSR-329-47 for the rear and part # SSF-401-54 for the front. These are both easy to install and will work well to provide additional support and help reduce body roll. They are a very popular upgrades for these Class B motorhome conversions.
    view full answer...

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Info for this part was:

Edited by:
Leah B
Video by:
Andrew K
Video by:
Dustin K
Expert Research:
Michael H
Video Edited:
Jacob T
Video Edited:
Chris R
Installed by:
Cole B
Installed by:
Robert C
Written by:
Mary E
Test Fit:
David F

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