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Heavy gear or a loaded trailer can make your suspension sag and your steering feel off. Coil SumoSprings Custom Helper Springs slide right between the coils of your existing suspension to help support that extra weight. Each spring’s microcellular polyurethane foam core automatically stiffens as the load increases, reducing body roll and keeping your truck level when it’s working hard.
When your factory coils are fully compressed, every bump can hit hard. These helper springs add cushioning between each coil to soften those impacts and keep the ride comfortable. The foam design absorbs shock and vibration so you’re not feeling every dip in the road, even when your rear axle is under load.
Unlike air systems that need constant pressure checks or hoses to route, these polyurethane springs require no air tanks, valves, or upkeep. Once installed, they quietly do their job with zero maintenance—just consistent support every time you haul or tow.
Coil SumoSprings stand up to harsh weather and heavy use. The material resists abrasion, oil, road salt, and UV damage while staying flexible in extreme temperatures. That means long-lasting suspension help without wear or leaks, no matter where the miles take you.
Customer Satisfaction Score:
87% were satisfied with this product
13% of customers were not satisfied
Ratings & Reviews
2005 Honda Cr-V, they went on pretty easy, it was a tight fit but no trimming required. I jacked the car up on some stands, had both sides installed and zip tied in 45 minutes..
Just finished installing these on my 2014 Ford Expedition EL Limited. Very easy to install. Never removed the wheel to install. Jacked the vehicle up one side at a time and did the install. Haven't hooked to my 30ft camper yet to see how they work. Will update after my trip in July.
OEM springs not strong enough.
After installed feels a lot stiffer and raised the back 2". Material looks really good. Installation done in 40 min using a nut driver, a flat head screw driver and hand soap. I did have to take wheel off it just makes like easier.
Initial reaction is positive - I installed front and rear sumo helper springs yesterday (5-23-19) and did a test drive around the block. The side to side pitching of our Transit Class B+ motorhome was greatly reduced. I still need to test on highway. I did not install the optional spacers that increase the ride height and reaction time of the rear sumo springs. The spacers will be added later if needed.
Perfect fit on my Ridgeline
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?
Improved handling/safety significantly while towing. This is the first vehicle I used these on. I will not have another tow vehicle without Sumo Springs.
It has a firmer ride now that this custom helper is installed.
Phil R.
4/30/2022
We installed the sumo springs on our 2016 Travado and they are all we were looking for, stability, leveling, and smooth ride, I have since put them on my 2014 GMC pick up and recommended them to our circle of construction workers and friends.
Not a bad self install if you use enough dish soap and once you figure out how to jam them in there....sure rides better and corners much more level
ALWAYS GREAT PRICINIG AND QUICK DELIVERY- ETRAILER IS A GREAT SOURCE FOR PARTS!
Love them on the Travato. Love etrailer too.
I added Sumo Springs to my 2019 Winnebago Travato on the Promaster chassis, and it made a huge difference in handling. Better ride, less sway, and surprisingly, not any harsher.
Would definitely recommend.
WAY harder to install than I thought, but once I figured out how to do it (the half-dozen YouTube videos I watched didn't really help) it went pretty easy. Far too expensive for what you get (should be a third the price at most), and didn't get any additional front lift on my brand new Promaster 2500. On the first test drive after installing them, I honestly didn't notice any difference. Time will tell. Probably could have done without them, at least for now.
Lazer S.
3/24/2026
Sorry to hear about the install difficulties, Robert. I do have to say that this kind of suspension supplementation will never lift the vehicle they are installed on though. They will really only "tighten" up the compression of the coil springs to offer more support. Have you tried towing anything with your Promaster yet to see if there is any difference? They do have a 30-Day satisfaction guarantee in case they don't perform to your liking.
Game changer
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.
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Evan
11/15/2022
Still doing fine after 1-year and 10,000 miles. They help smooth out a choppy ride I experienced at highway speeds when I had just the rear springs installed. Definitely install front and back!