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

SumoSprings Maxim Custom Helper Springs - Rear Axle

Item # SSR-336-47-1
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Vehicle Suspension

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SSR-336-47-1 - Standard Duty SuperSprings Vehicle Suspension
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2,200-lb Capacity. Maintenance-free microcellular urethane springs upgrade your vehicle's rear suspension. They cushion bumps and support a heavy load to level your ride and minimize sway. Springs attach at top and bottom for constant support. Lowest Prices for the best vehicle suspension from SuperSprings. SumoSprings Maxim Custom Helper Springs - Rear Axle part number SSR-336-47-1 can be ordered online at etrailer.com or call 800-298-8924 for expert service.
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  • Reviews (96)
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SuperSprings Vehicle Suspension - SSR-336-47-1

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

2,200-lb Capacity. Maintenance-free microcellular urethane springs upgrade your vehicle's rear suspension. They cushion bumps and support a heavy load to level your ride and minimize sway. Springs attach at top and bottom for constant support.


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
  • Springs are connected to your vehicle at top and bottom to provide support even when your vehicle is unloaded
    • Expand up to 50 percent of their height
  • 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 expand and 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
  • Easy bolt-on installation
  • 2 Springs and necessary hardware 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

SumoSprings helper springs are great for work vans. Towing or hauling a heavy 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 van's weight. 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.


SumoSprings diagram of installation above existing vehicle spring

Each spring in this kit is bolted to two mounting brackets. One bracket is attached to the frame of your vehicle, and the other bracket is attached to the axle, typically above your existing factory leaf spring. Because each helper spring is in full contact at the top and bottom of the suspension's travel, the expanding and contracting action of the SumoSprings enhances your ride under all conditions, not just when it's loaded. And the closed-cell urethane springs act like a shock absorber to dampen road vibration.


SumoSprings compressing under load

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 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.


SumoSprings expanding to allow play in the suspension

These springs extend in height by as much as 50 percent to allow more movement in your suspension when you're traveling unloaded, making your ride smoother and more comfortable.


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 expand and 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.


This kit comes with custom-fit brackets that are designed to easily bolt onto your vehicle.



SSR-336-47-1 SuperSprings Sumo Springs Maxim Rear Vehicle Suspension Kit for Vans

Installation Details SSR-336-47-1 Installation instructions

This Product Fits The Following Vehicles




Video of SumoSprings Maxim 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 Maxim Rear Helper Springs Review

Speaker 1: Today we're gonna be taking a look at SumoSprings Maxim Custom Helper Springs for the rear axle. You'll want to use our fit guide to verify, which one are the correct ones for your vehicle, and this is what our springs will look like when it's installed. It's got a mouth connected between the upper bracket connected to the frame and the lower bracket connected to our leaf spring.So when going over potholes or uneven terrain it's gonna absorb some of that shock, so it won't it transfer into the body giving you an overall smoother ride.Additionally, when you load down your vehicle, this is gonna help provide some cushion, and help keep your vehicle at it factory ride height when loaded down. This is gonna help keep your suspension at the correct geometries since it's closer to the factory ride height. So even while loaded down, you're not gonna get as bad of tire wear as you we're before. Helping to increase the life of your tires and your suspension components.Before we install our SumoSprings we'll take our motor home out on our test course and we'll see how it drives now.

I can already tell when turning even slightly the motor home wants to rock to the right. And as we go over the bumps it really starts to sway back and forth. This throwing you around is going to cause fatigue as you're going down the road. You're trying to maintain your self steady in your seat and control your vehicle. It's gonna leave you exhausted once you get to your destination and as I go through this longer turn I can really feel the RV staying out to the outside.

It doesn't want to spring back and become level. It keeps you hanging you hanging off on one side. Once you straighten it back out it really sways back and forth as it tries to return to that level center.And now with our SumoSprings installed we'll head back out on our test course. And even turning right into the test course I can feel our RV is staying straighter than it was before. And when going over the bumps I can feel that it's easier to hold on to my wheel and maintain straight line.

It's not jostling me back and forth nearly as much in the wheel or my seat. So overall I'm more comfortable and I can already tell it's easier to drive. So on those long distance road trips I won't have worry about being so fatigued when I get there.And now on that long turn I don't feel like a roller coaster going around the edge. It's much more straight up and down. I just feel like I can relax as I drive.

It's made of a durable micro cellular urethane, with operating temperatures of -25 degrees fahrenheit, up to 200 degrees fahrenheit and it's resistance against damage caused by oils, road salts, and UV rays.So when comparing these to your factory Jounce Bumper it's gonna provide more cushion, as there is always contact between the leaf spring and the frame with your SumoSpring, where as your Jounce Bumper has a gap and it only applies if you're near bottoming out your suspension.And, when comparing them to airbags, the SumoSprings are gonna be a lot less maintenance and they're gonna be a set and forget. They're always gonna be installed, doing their thing. Where as airbags are gonna change in pressure depending on the temperature of where you're at, so you're constantly have to adjust those pressures to maintain that proper ride height and load carrying capacity. Additionally airbags can leak down if there are any leaks with those systems, you can lose that. Where SumoSprings don't have any air in them. So they're always gonna be there. They're gonna be more reliable in ready to go. One of the benefits of airbags is that you are able to adjust them independently from side to side to help better compensate for uneven loads. You can also adjust the air pressure to an extreme of very high or an extreme of very low to match your load to match your load whether it be completely unloaded or loaded down as much as you needed it to be.And that completes our look at SumoSprings Maxim line of Custom Helper Springs for the rear axle.


Customer Reviews

SumoSprings Maxim Custom Helper Springs - Rear Axle - SSR-336-47-1

Average Customer Rating:  4.9 out of 5 stars   (95 Customer Reviews)

2,200-lb Capacity. Maintenance-free microcellular urethane springs upgrade your vehicle's rear suspension. They cushion bumps and support a heavy load to level your ride and minimize sway. Springs attach at top and bottom for constant support.

- SSR-336-47-1
by:

Improves front end stability and softens ride. A no brainer. 765047



- SSR-106-54-1
by:

Review from a similar SumoSprings Maxim in Vehicle Suspension


We ordered the sumo springs for our 2004 coachmen freedom series. The order came in just a few days as they did when we bought a heavy duty rear stabalizer last year. While I waited for the order ,myself and a grandson put the rear of our rv up on 7500 lb jack stands, two would have been fine but I wanted two more just in case. We took the rear duals off to make the installation easier ,and it was. Instalation went well,only having to move the gas line on passenger side up an inch by moving a clamp.We hoped these would help the light steering issue and related pushing from side when we would get passed on freeway. Not only did it clear up these issues but also quieted the coach down some. All my tests where done at highway speeds with the towed car behind. Thank you again to all at etrailer! Don. Ps. Had issue loading pics will update another time 786989



- SSR-187-40-1
by:

Review from a similar SumoSprings Maxim in Vehicle Suspension


Installation of the rear SumoSprings Maxim Custom Helper Springs was accomplished without any problems. All necessary parts to install the springs were supplied in the kit. The SumoSprings have made a great difference in the ride and stability of our 2015 Thor ACE. The ACE ride and sway has improved to the point it is like driving a new RV. The side winds that push on the rear do not make the front want to move toward the center line or road side. I don't feel like I'm in a constant battle to stay in my lane which will vastly improve my driving pleasure. Passing 18 wheeler trucks didn't make our rig move away like before. I feel much safer with this more stable drive. The RV also doesn't seem to have the top heavy sway as we corner we actually have a much safer and smooth transition. Our test drive home from the shop was about 22 miles, with 5 miles on 4 lane and 18 miles on a narrow two lane back road. I feel this gave me the chance to evaluate the improved performance gained by installing the SumoSprings. I know our next trip will be a much safer and pleasant drive Thanks to the SumoSprings. 611841


Comments
Great
John - 03/21/2020

71545

- SSR-184-40-1
by:

Review from a similar SumoSprings Maxim in Vehicle Suspension


First time using etrailor. Very satisfied. Very helpful customer service when ordering. Item received quickly and with all parts. Had the SumoSprings installed ... Wow! Huge difference in my ride, a 31 ft Winnebago. Stable, and much easier to steer. Seems to have quieted down much of the rattling, probably because of the much sturdier ride. Extremely satisfied, and highly recommend. 715353



- SSR-106-47-1
by:

Review from a similar SumoSprings Maxim in Vehicle Suspension


2019 Thor Outlaw 29J I've only driven this RV for about 1800 miles. I don't know if I could rate these any higher. I ordered both the front and rear Sumosprings and the fronts arrived earlier than the rear, so I went ahead and installed them and went for a 100 mile test drive. Night and day difference, no more harsh ride in the front, and a lot less pogoing. Now I can't wait until the rears come in and I can test those. 539764



- SSR-187-54-1
by:

Review from a similar SumoSprings Maxim in Vehicle Suspension


I have received but not installed will get back in a few months All looks good and service in receiving my order and shipping were outstanding 363209


Comments
The sumo springs installed by your techs like night and day traveling home after install had vicious cross wind and had know issues keeping it straight with little effort and cornering improvement is measurable. was a needed upgrade as the unit was brand new and very unstable.
Roy - 04/05/2018

36911

- SSR-187-54-1
by:

Review from a similar SumoSprings Maxim in Vehicle Suspension


Best purchase you can make for the f53 chassis. I can't believe how big a difference these things make. Very nice ride. Can actually drive for hours now and not feel fatigued. I recommend to buy these first thing when you get a new motorhome. 677974



- SSF-180-40-1
by:

Review from a similar SumoSprings Maxim in Vehicle Suspension


Installed Sumo helper springs SSF-180-40-1 and ssr-186-54 on my 2014 Georgetown 328TS on a F53 chassis the springs stabilize the ride also recovers faster on rough roads and doesn't bottom out anymore . Installation time was 2 hours and 45 minutes for front and back . I would definitely recommend this product. I received the springs in three days and service was very helpful from etrailer all it took was a five minute phone call to get the right set of springs for my MH . 376115



- SSR-187-54-1
by:

Review from a similar SumoSprings Maxim in Vehicle Suspension


Already had front sumos and my thought on them is lukewarm. I installed the rears and test drove it yesterday. Wow, what a difference when turning corners and entering/exiting driveways with a lip on them. No more rolling from side to side. My wife rode along on the test drive and also felt the difference almost immediately. It just feels stable. I highly recommend this product. Did the install myself in about 2 hours without pulling the wheels, just make sure you have a good right angle drill for the bottom rear holes. 547447



- SSR-106-47-1
by:

Review from a similar SumoSprings Maxim in Vehicle Suspension


I am sure these are very good, the only reason for the low rating is to get attention so no one makes the same mistake like i did. These DONOT FIT on a 2018 Jayco Greyhawk equipped with the JRide suspension. The Heliwig helper springs are in the way. etrailer application guide needs to be updated, the picture attached show the Heliwigs are in the way. 612717



- SSF-180-40-1
by:

Review from a similar SumoSprings Maxim in Vehicle Suspension


Before installing the Sumo Springs my motor home had a dangerous sway and would bottom out going on and off bridges and over passes. After installation, I have much better control of the vehicle. Sumo Springs have made my vehicle a much more comfortable vehicle to drive. 327544



- SSR-187-54-1
by:

Review from a similar SumoSprings Maxim in Vehicle Suspension


Installed front sumosprings myself and they made a great improvement in sway from passing trucks. Just received my rear sumosprings and can'r wait to get them installed before our next trip. Thank you etrailer, for having a great price and answering my calls, to discuss all my question before and after I purchased my products. 595308



- SSR-106-54-1
by:

Review from a similar SumoSprings Maxim in Vehicle Suspension


Firstly great many thanks to etrailer for advice and and product information. You helped buy the perfect fit for our Fleetwood Tioga ranger. When it came to fitting the sumo springs your video and instructions made it so much easier. It took around 2.5 hours to fit and we didn’t even have to take the wheels off. The difference before and after fitting the sumo springs is definitely noticeable. There is less sway, less sag and overall a better ride. I am glad we went with more heavy duty version that you recommended. Our class C Rv is quite heavy and this kit suits it very well. We would recommend this to anyone who has a ford E450 super duty chassis for their rv 683535



- SSR-187-40-1
by:

Review from a similar SumoSprings Maxim in Vehicle Suspension


Our 28 foot Ford chassis Class A handles like flying a kite with no string. It needed help. I started with the Sumo springs because the description made it sound like I could do them myself. Yep. Job accomplished. Then, I purchased a front sway bar, which did not come with my motorhome. Got ready for the job and discovered Sumo springs are incompatible with mounting a front sway bar. Had I known… By the way, we are still flying our kite and having a ball. 15 states and 16,000 happy miles. But it could be better. 649728



- SSR-187-54-1
by:

Review from a similar SumoSprings Maxim in Vehicle Suspension


2017 Newmar Canyor Star: We installed the front & rear SUMO springs and the side-to-side sway improved a lot. Total installation time was less than 4 hours. 851600



- SSR-184-40-1
by:

Review from a similar SumoSprings Maxim in Vehicle Suspension


The SumoSprings made a big difference in the handling of our motorhome and significantly reduced the body roll. 848978



- SSR-180-54-1
by:

Review from a similar SumoSprings Maxim in Vehicle Suspension


My 2007 Allegro Bay on an F53 chassis had a real tendency to bob and weave on crooked roads and in windy weather. The Sumo Springs removed virtually all the instability. The coach handles much better and I am not as fatigued at the end of the day. 830969



- SSR-187-54-1
by:

Review from a similar SumoSprings Maxim in Vehicle Suspension


Made for a more comfortable drive. No longer felt as if you were in a boat floating around corners. Ease of traveling. 830605



- SSR-187-40-1
by:

Review from a similar SumoSprings Maxim in Vehicle Suspension


We are so excited our Sumos have arrived! We are having them installed by a local Custom’s installer shop next Wednesday, and we just can’t wait to experience the ride on our 2015 Forest River FR3 30DS! We have pretty much customized everything else inside with a lot of help from etrailer, now thankful they are there for us for the outside stuff as well! 829856



- SSR-187-54-1
by:

Review from a similar SumoSprings Maxim in Vehicle Suspension


Thanks for the fast service. 829202



- SSR-106-54-1
by:

Review from a similar SumoSprings Maxim in Vehicle Suspension


I worked with the E trailer staff for recommendations for my 2017 E450 motorhome. I was having Sway issues and wind issues with semi trucks inside wind. They recommended a front and rear sway bar, a reflex steering stabilizer shock and the sumo springs helpers for the rear axle. I installed all four items at the same time and all my issues were solved. The coach drives very stable and the Rear of the motorhome does not Sage either. They were great help! 825106



- SSR-187-54-1
by:

Review from a similar SumoSprings Maxim in Vehicle Suspension


Great Product and great service 822208



- SSR-106-47-1
by:

Review from a similar SumoSprings Maxim in Vehicle Suspension


ordering and shipment were spot on. I have not installed the product yet. 820252



- SSR-184-40-1
by:

Review from a similar SumoSprings Maxim in Vehicle Suspension


They made my pursuit rv handle like am SUV love them also cut down on away and being blown off the road by the big rigs 819043



- SSR-184-40-1
by:

Review from a similar SumoSprings Maxim in Vehicle Suspension


great help 811525


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Ask the Experts about this SuperSprings Vehicle Suspension

  • How To Improve the Ride on a 2014 Mercedes-Benz Sprinter 3500 Chassis
    The SumoSprings Maxim Custom Helper Springs like part # SSR-336-47-1 do indeed offer a better ride quality when compared to the SumoSprings Solo Custom Helper Springs like part # SSR-338-47 which is what I assume you are referring to. However, the SumoSprings Maxim Custom Helper Springs will only work for you if you have the standard axle configuration and not the 2" spacer (see photo). If you do have this spacer which most Sprinters do then you will want to consider the Roadmaster...
    view full answer...
  • How To Softer the Ride On a 2015 Mercedes-Benz Sprinter 3500 Passenger Van
    In order to help soften the ride in the rear of your 2015 Mercedes-Benz Sprinter 3500 I recommend installing the SumoSprings Maxim Custom Helper Springs part # SSR-336-47-1 so long as you don't have the 2" block lift between the axle and spring pack (see photo) otherwise you can use the SumoSprings Solo Custom Helper Springs part # SSR-338-47. These options will both work to improve/soften the ride quality on your Sprinter. The Timbren Rear Suspension Enhancement System part # TMBRSP35B...
    view full answer...
  • SuperSpringsRear Suspension Enhancement on a 2011 Mercedes-Benz Sprinter 3500
    Any suspension enhancement that you add to your 2011 Mercedes-Benz Sprinter 3500 wouldn't necessarily add height to your RV, but it would help to keep it level when under a load and would also help create a more comfortable ride. The SumoSprings Maxim Custom Helper Springs # SSR-336-47-1 are a great option to add to your Sprinter for suspension enhancement. They have a 2,200-lb weight capacity at 50% compression (they will not raise the weight capacity of your Sprinter) and they are...
    view full answer...
  • Sway Bar and Steering Stabilizer Recommendation for 2016 Winnebago View Motorhome 24D 3500
    For the 2018 Winnebago View 24D class C motorhome built on a 2017 Mercedes-Benz Sprinter 3500 chassis we do have confirmed fits for aftermarket rear anti-sway bars but not for the front. For that you'd want the part # RM-1209-120 which is a confirmed fit and would work well. This will greatly help your ride quality. For a set of SumoSprings for the rear we have the part # SSR-336-47-1 which will work well too. SumoSprings are highly recommended in the RV world because of how well...
    view full answer...

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Info for this part was:

Edited by:
Leah B
Video by:
Dustin K
Installed by:
Cole B
Installed by:
David F
Written by:
Mary E
Updated by:
Sarah W
Updated by:
Hannah L

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