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Coil SumoSprings Custom Helper Springs for Coil Spring Suspension - Rear Axle

Coil SumoSprings Custom Helper Springs for Coil Spring Suspension - Rear Axle

Item # CSS-1094R
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Get the cushioning power of SumoSprings for your coil springs and keep your ride comfortable. The wedge-shaped springs fit between the individual coils of your existing springs and help support heavy loads on your rear suspension. Lowest Prices for the best vehicle suspension from SuperSprings Intl. Coil SumoSprings Custom Helper Springs for Coil Spring Suspension - Rear Axle part number CSS-1094R can be ordered online at or call 1-833-496-1390 for expert service.
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SuperSprings Intl Vehicle Suspension - CSS-1094R

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

Get the cushioning power of SumoSprings for your coil springs and keep your ride comfortable. The wedge-shaped springs fit between the individual coils of your existing springs and help support heavy loads on your rear suspension.


  • Helper spring inserts increase ride comfort and enhance your coil suspension's ability to support loads
    • Inner core of microcellular polyurethane foam provides cushioning and support
  • Adjusts progressively to the weight of your load - the more you load onto your vehicle, the stiffer they become
  • Reduces body roll and helps level your truck
  • Withstands extreme temperatures
  • Durable springs resist damage caused by abrasion, oil, road salt and UV rays
  • Installs easily on rear coils
    • Inserts between the individual coils of each coil spring
    • Custom fit for your vehicle
  • Requires no maintenance
  • Includes 2 helper springs
  • Made in the USA


  • Application: rear coil spring suspensions
  • Designed to work with a suspension system that is in good working order
  • Coil SumoSprings will not increase your vehicle's weight-carrying capacity. Do not exceed the manufacturer's weight limit for your vehicle.
  • Limited Lifetime warranty
  • 30-Day satisfaction guarantee

Insert these helper springs in between the individual coil loops in your rear coil springs to defeat driver fatigue and add better support for heavy loads. Most factory coil suspensions have a difficult time hauling added weight. The rear coils may struggle with supporting the extra load placed on your rear axle when you're towing a trailer or using a hitch-mounted cargo carrier or bike rack. If your coil springs are totally squished under a load, the lack of shock absorption can be harsh on your backside, especially if you spend long hours sitting in your vehicle while driving to your campsite.

Coil SumoSpring installed between rungs of coil spring

Inside each helper spring, a core of microcellular polyurethane foam adds cushioning between your coils to make your ride more comfortable. Each doughnut-shaped spring has H-shaped channels at the top and bottom that fit to the rung of an individual coil in your rear coil springs. The cushioning absorbs shock, but also works progressively to better support weight, keeping your truck level.

Unlike air springs that fit inside your coil springs, these polyurethane springs require no air pressure monitoring, and they are easier to install. Say goodbye to air lines, valves and air tanks and hello to maintenance-free suspension support. Unbumpify your ride with Coil SumoSprings for coil suspensions.

CSS-1094 SuperSprings Coil SumoSprings Helper Springs for Coil Spring Suspension - Rear Axle

Installation Details CSS-1094R Installation instructions

This Product Fits The Following Vehicles

Customer Reviews

Coil SumoSprings Custom Helper Springs for Coil Spring Suspension - Rear Axle - CSS-1094R

Average Customer Rating:  4.6 out of 5 stars   (295 Customer Reviews)

Get the cushioning power of SumoSprings for your coil springs and keep your ride comfortable. The wedge-shaped springs fit between the individual coils of your existing springs and help support heavy loads on your rear suspension.

Subaru Outback Wagon

We purchased these for our Outback about a year ago. They definitely improved the ride when towing our tear drop trailer, especially over the “washboard” sections of I80 in PA, and some of the logging roads in northern Maine. Our mechanic complimented us on the choice as well. Not needing a total suspension upgrade, these helper-springs are a great alternative for an improved ride for small vehicle lite/medium load road hauling. We’ve made several purchases from e-trailer – these hit the mark like everything else.

2013 Subaru Outback Wagon

The instructions, well!! lack a bit of detail. My first instinct was to return them . I called the manufactures tech line ,and got the 10-36 asap.

........ after that the install was a breeze !!
I am in the opinion these helper springs will stiffen the rear coil enough to balance a heavier tongue or small trailer weight.

Do these work well towing a 2200 lb work trailer hauling a moderate load with a 03 tahoe
-- comment by: Tracy - 06/08/2014


These items worked great! Easy to install as the video guides helped a ton!


Coil SumoSprings for a 2008 Honda Fit Sport. I ordered the correct springs based on etrailer's website and when it came time to install them, we discovered they were too big. I called etrailer customer service and was fortunate to be connected to Natalie L. Natalie was patient and after a couple of calls, found the springs that work for my vehicle. Natalie updated the website to reflect the accurate part number. Natalie, thank you for making the return process painless. Your customer service was outstanding, Natalie. As an aside, it's difficult finding and keeping good employees. I'd do what I could to keep Natalie.

The replacement springs have been installed and working as expected.


Etrailer customer service is always excellent.

product installs easily and quickly and performs as claimed. Provided just enough additional compressive loading resistance in conjunction with the rear struts to prevent bottoming out while towing a lightweight pop up camper. Quick fix for folks hauling something with 100 pounds or less of tongue weight.

Tips: 1" overlap worked best on my Subaru. SumoSpring elastomer cut easily and accurately with a band saw. Knife works but the elastomer is slippery and the cut is less than accurate.
As you push the zip ties through their holes put an index finger under the hole on the inside and direct the end of the zip tie upwards to make it easy to retrieve. Make zip ties snug but not so tight they distort the geometry of the elastomer.

Continue to be pleased with the SumoSprings on our 2005 Subaru Outback. The alternative was to spend $800 for new heavy duty rear struts. They work well to prevent bottoming out when towing a camper and dont seem to effect the overall ride quality when not towing a trailer.
Brian M - 03/25/2015

Subaru Outback Wagon

These work really well to keep the back end of my Subaru Outback from dropping when towing my 5x10 trailer.

2013 Volkswagen Touareg

Installed this on my 2013 Diesel Cayenne as I put larger tires on it and when hauling trailers it bottomed out. It still does from time to time, but it has been drastically improved.

2011 Subaru Outback Wagon

Just installed them on my ‘11 Subaru Outback and they appear to function well over 1 short trip. I was initially concerned as following the instructions demanded I trim almost 4” off of them, but a tech at the manufacturer stated it would be fine. I did and installation was a breeze


For me it's dont seem to make a big difference. Maybe if i double the kit I will fill it. But it hold nicely in place, they are in place about a year now and the tirap do the job. It's easy to install. But for the price I will figure to replace the coil spring by stronger one.

2013 Subaru XV Crosstrek

Easy Easy Install
Great directions
in minutes
Did remove the rear wheels
Cause it is easier
Can't wait to see how they work with a trailer on my Subaru XV Crosstrek


Arrived sooner than expected, installation was simple and quick. It seems as though I will havean additional 1” of lift. Looking forward to trying it out on a trip.
It fitted on my Forester 2015.

2017 Subaru Outback Wagon

These are great for increasing the stability of my car when I'm towing my boat

2011 Ford Crown Victoria

Coil SumoSprings-These supported my Crown Vic towing my trailer LOADED from Pennsylvania to Florida no bottoming out. In FL, I tow my 16 ft boat no problem. I like my Crown Victoria P7-F150!I recommend this product 100.Great service again from etailer!
Harold - 08/11/2022


2012 Subaru Outback Wagon

Easy to install, took about 15 minutes.


2011 Volkswagen Touareg


Review from a similar SumoSprings Coil in Vehicle Suspension

Installed the CSS-1168R Coil SumoSprings Custom Helper spacers on a 2011 Honda Ridgeline 4 wheel drive rear springs. Installation took about 45 minutes including removal of tires. Once spacer was started the installation was easy.
Zip ties were a little more difficult because of the dust strut covers installed by Honda.

Excellent product. Holding up great. When towing my camper, the squat is less the 1. Much better then before when 3 was the norm.
Thomas - 09/20/2021


Review from a similar SumoSprings Coil in Vehicle Suspension

Easy to install on 2020 Mercedes Metris Cargo Van if you remove tire, clean spring and use soapy water to lubricate coil. Reduced "squat" about 3/4" for ~325 Lb. trailer tongue weight without weight distribution hitch.


Review from a similar SumoSprings Coil in Vehicle Suspension

Works exactly how I needed. The Ride is still very nice. There's about 350lbs with the weight of the box & rack. Suspension in the rear used to sag a bunch, even with a 2" suspension lift.


Review from a similar SumoSprings Coil in Vehicle Suspension

The Sumo Springs Custom Helper Springs I purchased and installed on my 2022 Winnebago Solis 59PX have made all the difference in the way the vehicle handles. I purchased both sets of helper springs for the front and rear. They have made a huge difference. I believe they are worth the price of the products.


Review from a similar SumoSprings Coil in Vehicle Suspension

Pretty easy install on a Winnebago Solis, built on the Ram Promaster 3500 chassis, took about an hour to install on all 4 wheels. I only parked on a level surface and used the factory jack, didn’t even lift the van off the ground all the way but enough for clearance to install, no tire removal done. I gained about an inch of clearance which is nice for my onboard generator and hoping for a better ride on windy days. The pictures are before and after of (in order) front, rear, size difference of Sumo vs. oem and the generator.


Review from a similar SumoSprings Coil in Vehicle Suspension

Installed pretty easily. The trick is to start at the bottom of the spring and push it up. Didn’t need to apply any soap but springs were pretty clean to begin with (38K miles). The kit did not come with zip ties even though the etrailer description says it should, but the Sumosprings documentation clearly states they are not included.


Review from a similar SumoSprings Coil in Vehicle Suspension

Ok installed outside january 27th. Temp 10 degree windchill -5. I used canola oil since it stays slippery when cold. I recommend taking off the tires. Also wirebrush the coil spring to get rust and debris off. Coat coil spring in canola oil. Also 1997 crv rear will require about 3/4"-1" off of the helper spring before hand. The driver side took 15-20 mins the passenger less than 5. My car rear was sagging it sits level or slightly above level now in the rear. Mileage of vehicle is 73k shocks struts and springs are original. Curt class 3 hitch is also installed on vehicle. I am curious to see how it does while pulling a 5x8 trailer. Overall seems good only time will tell. Wondering how installing two on a side would do?

So far so good it eliminates sag while towing or having heavier objects in the vehicle.
bruno f - 01/28/2020


Review from a similar SumoSprings Coil in Vehicle Suspension

I could not place the SumoSprings in the middle of the coil springs to start installation. Rather I had to start lower on the coil springs, where the spacing is wider, and then slide the SumoSprings up to the middle.
I used a screwdriver run into the holes for that purpose to help slide the SumoSprings to the middle of the coil springs. Otherwise, the installation went well. There seems to be less squat in the rear of my '04 Highlander when my camping trailer is attached.

There still seems to be less squat with my camping trailer attached. It is leveled out a bit.
Michael T - 08/15/2015

Show More Reviews

See what our Experts say about this SuperSprings Intl Vehicle Suspension

  • Recommended Super Springs Rear Coil Helper Springs for 2011 Subaru Outback with 3.6L H6 Engine
    The difference between Super Springs Coil Helper Spring kits # CSS-1094 and # CSS-1094R is that the CSS-1094 can be used in either front or rear coil spring applications while the other kit is for rear springs only. For your 2011 Subaru Outback with 3.6L H6 Engine use kit # CSS-1094R on the rear axle. Please note that this item requires some trimming for installation on your vehicle.
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  • How To Prevent Sag While Towing With a 2011 Volkswagen Touareg
    The Coil SumoSprings Custom Helper Springs for Coil Spring Suspension part # CSS-1094R are exactly what you'll want to use to try and level a 2011 Volkswagen Touareg while towing. It is actually the only option available but nonetheless still a good one. These are also super easy to install as well so you can do this at home by yourself.
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  • Coil SumoSprings Custom Helper Springs Availability for a 2018 Subaru Forester 2.5 Premium
    So far as of June 2019 there aren't any suspension enhancement options for a 2018 Subaru Forester, but if you can get me some measurements of your rear suspension springs I can make a recommendation for correct Coil SumoSprings Custom Helper Springs like the part # CSS-1094R you mentioned. The letters on the left (A, B, C, and D) are when your Forester is loaded while the letters on the right (E and F) are when the Forester is unloaded. If you can get me these dimensions I can use a calculator...
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  • Will Rear Suspension Enhancement Springs Increase the Tongue Weight Capacity of a Vehicle
    Rear suspension enhancement will not increase the tongue weight capacity of a vehicle. They will only reduce the amount of sag in the rear suspension. I looked up the owners manual for your 2008 MKX and it looks like the maximum tongue weight capacity for your vehicle 350 lbs no matter what additional components are used. My recommendation would be to reduce the tongue weight on the trailer. If your travel trailer has anything mounted on the tongue such as propane tanks or storage bins,...
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  • How To Prevent Suspension Sag When Towing Trailer With 2014 Subaru Outback Wagon.
    Ideally you want a ball mount that allows you to tow your trailer level, but this will not keep your 2014 Subaru Outback Wagon from sagging slightly when the trailer is hooked up. To prevent sagging you would need suspension enhancement like the Coil SumoSprings Custom Helper Springs for Coil Spring Suspension # CSS-1094R which is confirmed to fit your Outback as long as it is not a 2WD model. The # CSS-1094R progressively stiffen up the rear coil springs of your vehicle when weight is...
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  • Will CSS-1094R Coil Sumo Springs Help Reduce Rear End Sag From Trailer Tongue Weight
    The # CSS-1094R Coil SumoSprings helper spring would indeed help reduce some of the minor sag caused by the tongue weight of a trailer being applied to the rear suspension of your Touareg. The product mounts in between the coils of your existing rear springs to provide additional support and dampening. They will also help reduce body roll experienced in turns. This is the only helper spring option we offer for your 2015 VW Touareg. I'll link to a video that explains more about the Coil...
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  • Will Installing The SumoSprings CSS-1094R On A 2020 Subaru Ascent Lift The Rear When Unloaded?
    As the Coil SumoSprings # CSS-1094R will fit in between the slats of the coil spring on your 2020 Subaru Ascent, it will not lift the rear up at all. However, they will definitely help if the back of your vehicle is sagging as they will supplement your factory springs and give them a little support when needed.
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  • Coil SumoSprings Custom Helper Springs for Coil Spring Suspension - Rear Axle - 2010 Subaru Outback
    The SuperSprings Coil SumoSprings would be an excellent addition to your 2010 Subaru Outback Wagon to help reduce sag when you are carrying your motorcycle. Once the SumoSprings are installed, they will not raise the rear of your Outback. They are simply there to keep the rear coil springs from compressing as much when there is a load. To answer your second question, the difference between the SumoSprings, part # CSS-1069R and part # CSS-1094R, are their size. The number in the part number...
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  • Weight Distribution or Suspension Enhancement for 2014 Subaru Outback Wagon
    Since your 2014 Subaru Outback is not rated for use with a weight distribution system the best option would be a suspension enhancement kit that fits your vehicle like the Coil SumoSprings part # CSS-1094R. But no option will give your vehicle/hitch a higher towing capacity to tow beyond the capacities of your vehicle. We do have higher rated hitches that fit your vehicle like the Draw Tite part # 76227 but if your vehicle is rated for only 200 lbs tongue weight this also wouldn't give...
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  • SumoSprings Suspension Enhancement Recommendation for a 2009 Subaru Outback Wagon
    Yes, there are SumoSprings available that are confirmed to fit your 2009 Subaru Outback Wagon. If you have the H6 engine you would want the part # CSS-1069R. If you do not have the H6 engine you would want the part # CSS-1094R. Other customers who have bought these two part numbers have left reviews saying the install was pretty easy and that removing the wheels helped. Soapy water can also be used if the spring is being stubborn.
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  • Suspension Enhancement Recommendation For 2004 Chevrolet Tahoe 4x4
    Personally, since you are in the market for a smoother ride, I recommend the Coil Sumo Spring Custom Helper # CSS-1094R, which, as an added bonus will help support heavy loads on your rear suspension. The Coil Sumo Spring, unlike the AirLift # AL60769 that you referenced, will not have to be adjusted or monitored. I have attached the installation directions, but, basically, they simply fit within your existing coil springs and secures with zip ties.
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  • Suspension Enhancement for Rear Suspension of 2010 Subaru Outback Wagon
    We have suspension enhancement kits for the rear suspension of your 2020 Subaru Outback Wagon like with the Coil SumoSprings kit part # CSS-1094R but there are no Air Lift kits like the # AL61730 that you referenced that are a fit. The SumoSpring kit will give you rear suspension support that won't require maintaining air pressure so it's a maintenance free solution.
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  • Can Weight Distribution Hitch Be Used On 2021 Subaru Ascent
    I do have an option for you buy you cannot use any sort of weight distributing device on a 2021 Subaru Ascent due to the design of the vehicle. Therefore, the only option you have for weight distributing is suspension enhancements for which the only option currently is the Coil SumoSprings Custom Helper Springs part # CSS-1094R. These work well and are easy to install. Then for the sway control you can use the Sway Command Electronic Sway Control System part # LC380605 if the trailer has...
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  • Sway Control and Suspension Enhancement Recommendations for a 2013 Subaru Outback
    Since the Hidden Hitch # 87568 is not rated for use with a weight distribution system I would not recommend you attempt to use a system with it. The best recommendation I could give you would be to load your trailer properly and if you are experiencing any sag you could install a set of Coil SumoSprings Custom Helper Springs for Coil Spring Suspension # CSS-1094R. These will help your vehicle ride level by giving extra support to the rear suspension. There is a sway control system that...
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  • Can SumoSprings Be Added To 2002 Chevrolet 4WD Tahoe With Front And Rear Timbrens In Place
    The first thing you will want to do is inspect your suspension system to make sure it is in good working order. If you have a weak suspension and relying on the Timbrens you already have installed, you will get more bounce than normal. The Timbrens are intended to help with a properly working system to help add support when carrying heavy loads. I called my contact at Timbren and they told me that adding additional support to the rear coil springs on your Tahoe like part # CSS-1094R will...
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  • Parts Needed to Tow Trailer With 2012 Subaru Outback 3.6R
    To answer your question about if a 2012 Subaru Outback 3.6R can add a Class III Draw-Tite trailer hitch with a 2" receiver the answer to that is an unequivocal yes! The two Draw-Tite hitches that fit this car are the Draw-Tite # 76227 and # 75673. Of these two hitches I strongly recommend part # 76227 because it does not require drilling to install and also has a hidden crosstube to keep your Outback's appearance clean; the other model does require drilling and has a visible crosstube. In...
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