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When heavy gear or a trailer pushes down on the back of your vehicle, the rear end can sag and throw off your steering and braking. These SumoSprings Solo Custom Helper Springs add up to 1,000 lbs of support at 50-percent compression to help your suspension stay level. They work with your factory setup to even out weight distribution so your front tires keep proper contact with the road. That means steadier handling, safer headlight aim, and less bottoming out when the load gets heavy.
Rough pavement or uneven loads can make driving a handful. The microcellular urethane springs compress progressively—soft at first for comfort when lightly loaded, and stiffer as the weight increases. They cushion bumps and shocks for a smoother ride whether the bed is empty or full. With up to 80 percent compression under heavy load, they give solid support without making the unloaded ride harsh.
Sharp turns, crowned roads, or uneven cargo can cause sway that throws you off balance. Each SumoSpring works independently to handle its side of the vehicle, reducing body roll and helping compensate for off-center loads. You’ll feel more control through curves and less rocking when you hit dips or driveways at an angle.
These springs are made from closed-cell microcellular urethane that resists oil, road salt, UV rays, and abrasion. They handle temperatures from -25 F to 200 F without losing performance. Because they compress vertically with minimal sideways expansion, they fit safely into tighter suspension spaces without contacting other parts. There are no airlines or compressors to maintain—just dependable support every time you load up.
Getting better suspension support doesn’t have to be complicated. The custom-fit SumoSprings bolt in with a simple no-drill installation using basic tools. Once installed, they’re completely maintenance free with no air pressure to monitor or fittings to adjust—just steady load support ready for every haul or trip.
Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.
Hey guys, this is Jake here with etrailer. Today we're gonna be talking about the density differences in the different colors of SumoSprings. More specifically, today we're gonna be talking about the blue line of SumoSprings. So just to compare each one to start with, the blue is going to be for your lighter, more frequent use. The black is going to be a more heavier duty, constant use, and then your yellow is going to be a more extreme duty, if you're constantly towing at the max capacity of the vehicle that you're using. To go over each one a little bit more and what case is best for each one, the blue one, which is why it's most popular, is going to be for frequent towing.
If you're towing like what we've got back here, a couple of buckets of salt or if you're going to the store to pick up a load of lumber or different building materials, whatever you're hauling, if you don't have a constant load on these, these are gonna be a great option. If you're wanting to put a set of SumoSprings on, say a sprinter van that's always loaded down with tools or maybe a rigging truck that's got a welder in the back, and you just want a little bit more support than what the factory suspension can supply, the black ones are gonna be a great option if they're always engaged. The yellow is going to be your most extreme option. So if you're pushing your vehicle to its max weight capacities, the yellow's probably gonna be what you're gonna want to go with because they're gonna supply the most support if you're at that max capacity. Now focusing more in on the blue set, they are going to be made out of a softer compound, which is why they're so ideal for people who are not towing all the time because the suspension on the vehicle is designed to be soft for a comfortable ride.
Well, if you go and throw a super stiff add-on spring on there, then it's gonna completely eliminate the fact that you had a softer suspension before. So when you put these on, they're going to help to absorb the shock rather than resist it like the other ones are. For when you hit bumps, this one's going to absorb it. It'll be a soft-cushion feel, whereas those are stiffer, so they're going to hit the frame, and you're gonna feel it transfer through the vehicle. Now, being made out of a urethane material, it's going to make it quiet but still harsh.
With the blue ones they are, like I said, they're gonna be much softer. If you're not towing all the time, these are gonna be a great option to add to your vehicle because you're gonna get the support when you need it and you won't even know it's there when you don't. Now, when it comes to installation, SumoSpring does a great job of making a custom install for each vehicle that you purchase these for. For example, we installed some on this 2020 Nissan Frontier, and this lower bracket is identical to the bracket that the factory jounce bumper was bolted onto. Except this one is going to be a little bit beefier, which is always a good thing.
You want the hardware to be able to support the add-on that you're putting on there. So depending on your vehicle, you can use our fit guide to find the right SumoSpring to fit your vehicle. Let's go ahead and take this over the test course and see how the suspension performs without our SumoSprings, and then we'll get them installed. Now to start off our test course, we're gonna start with just a couple of little bumps. Oh, you can feel a lot of sag in the back end of this truck because it's already compressed, so when we go over a bump there's not much more room to travel after that. When I'm hitting these bumps, the steering on the front feels very light. The steering wheel is kind of doing whatever it wants, and we're going at low speeds too, so this is not even a, not really a true example of what you might experience on the highway with high winds or anything like that to cause sway or any other problems you might have. But this is giving us a very good example of how soft the suspension is. Even with 450 pounds in the bed, that's, I mean, that's hardly nothing for what the owner of this vehicle typically hauls with it. He hauls a heavier trailer to do some side work here and there, and he's got usually about 400 pounds on the tongue or on the trailer hitch itself. So that's a lot more leverage than just in the bed of the truck directly over the axle. So in our little slalom here, driving back and forth, you can feel a little bit of body roll side to side. So hopefully those SumoSprings are gonna help out with some of that roll and help to get this suspension a little bit more dialed in and provides more support for us. Now with our SumoSprings installed in that same 450 pounds in the bed of our truck, take another measurement, we're at 34 and a half inches, so that's only a half inch of sag compared to the inch and a half we had earlier. Now with suspension enhancement, it's designed to provide some support not get it back to that factory ride. We want to have a little bit of sag because that's how we get the correct amount of weight on our ball mount or the tongue of our trailer. For when we are going over bumps is really when it's gonna count. We're not gonna have that same drop that we had in the first run. So let's go ahead and take it through and see how the support is with our SumoSprings. To start off our test course with our SumoSprings installed, we've got that same double bump. You can tell there's a lot more support in the rear now. Now these SumoSprings are still going to be relatively soft compared to a set of Timbrens or something a little bit stiffer, but you can tell, yeah, on that double bump there, it still has that softness that we want, but it's supporting it, and that's definitely what we're looking for out of this set. Now coming around a turn, we didn't have a whole lot of body roll before, but I can definitely tell it's a little bit more solid back there. I went over some small bumps in the parking lot, and I think it's handling quite a bit better than it was before. Again, we've only got about 450 pounds in the bed, so it's not a crazy heavy load, but it's definitely enough to engage our SumoSprings to really see how they work. Now the only thing is with this kit, you're not gonna have the adjustability like you would with a set of airbags, but for the example of this neighbor of ours that owns this vehicle, he doesn't need the adjustability. He's hauling the same load all the time, and it just so happens to be a decently heavy trailer that makes his truck squat a lot more than he feels comfortable with. So this set of SumoSprings is gonna work out great for him. These are gonna be made out of a microcellular urethane, which is essentially another term for foam that has tiny little air pockets in it that allow it to flex enough but also be stiff enough to provide that support. They are also going to be a progressive spring, so the more and more they compress the stiffer they get to provide that support. There are a couple options for jounce-style replacement springs on our website. I do like these a lot because there's other types out there that are much stiffer. They may be able to hold a lot more than these can, but a lot of trucks, such as the Frontier, they don't need that much support. These being rated for 1400 pounds is more than enough support for this Frontier and what it can handle. And the reason for that is, with those stiffer springs, you almost have to be loaded to half the capacity that they can carry in order for them to give you a comfortable ride. These being that softer urethane material, when you go over a speed bump or anything unloaded, you're not gonna feel a knock up against your frame because those other springs, when they engage, since it's such a hard rubber you'll feel it every time you go over a bump or anything like that. With these, you're not hardly gonna feel it because they are that softer material. These jounce-style bumpers are gonna be for the rear of your vehicle, but if you're looking for a front-end suspension enhancement, SumoSprings does make a variety of different products for different vehicles, so be sure to check out our fit guide to see what kits are available for your vehicle if you're having an issue with your front end. Hopefully this video was able to help you decide whether or not the Blue SumoSpring line is the right one for you.
Customer Satisfaction Score:
94% were satisfied with this product
6% of customers were not satisfied
Ratings & Reviews
Very easy installation. The improvement in handling is phenomenal.
2024 Z71 Silverado towing a travel trailer. Prior to these springs, the truck would bounce and sag. With the SumoSprings, truck is stable and sags less. Unloaded truck drives like factory. Easy install on my own.
The Sumo helper springs were not difficult to install (had to jack up the rear a few inches) & I really do think they have helped with steadiness in towing our camper.
Would recommend.
I have had these on my 2006 Colorado for a year, great product easy install I haul a compact tractor with bucket and tiller on a single axle trailer and the truck doesn't sag. No adverse ride quality when carrying no load definitely better than installing air shocks. Highly recommend to anyone having issues with vehicle sagging when loaded.
If you want an affordable, indestructible suspension upgrade to eliminate rear sag and towing harshness—without the maintenance head-aches of air systems—the SumoSprings Solo sourced through etrailer.com is one of the smartest weekend upgrades you can make. The installation was easy and the install video they provide on YouTube is priceless.
I’ve owned these SumoSprings for a year now and love them! I installed them on a 2016 Ram 1500 Crew Cab Outdoorsman 4x4. I tow a 7x14 aluminum cargo trailer that probably weighs 4000lbs loaded with gear. Before installing the SumoSprings my axles would almost touch my OEM bump stops and truck would sag. With SumoSprings my truck rides more evenly and is surprisingly smooth on the road. The ride quality is definitely better with SumoSprings. Less body roll in corners and an overall more confident ride. When I’m not towing I don’t even know they’re there. Awesome product!
Really solid for the money. Obviously if you plan to haul a load regularly you should upgrade springs or run bags, but these were a great temporary measure for hauling my bikes out west and back in my frontier. Easy to install and do the job well; particularly noticed the difference on rough dirt roads where in the past I would have been banging on the bump stops.
The Sumo Springs worked great in my 2022 Nissan Frontier and stopped the rear from sagging under trailer load but rode like normal unloaded. Very good product and very easy to install.
This only pertains to the order, shipping speed, and install as I have not put a heavy load on these sumo Springs yet but I feel like that's a foregone conclusion based off the reviews already. The ordering process, the shipping, and the installation was unbelievably easy. I kept rereading the instructions thinking this can't be right because it was so simple. I looked at the YouTube video and realized it is that simple! So happy with the ordering process, the quality of the initial product I opened, and how simple it was to put on the jeep.
I was surprised at how much of a difference these actually make. I bought them based on some videos of others using them, but wasn't sure if they would actually make much difference in my situation. I tow a 6800lb trailer with a Silverado 1500. With the tongue weight of that trailer, the rear of the truck doesn't drop all that much and I wasn't sure if replacing the bump stops was even necessary, but when I'm on roads with "heaves" and especially bridges where porpoising can be a problem, these SumoSpring certainly help. You probably won't notice some huge drastic change, but it's just enough to matter and even out the ride to a noticeable degree. Also, they're pretty easy to install (and I'm only barely handy when it comes to this stuff.)
I've never put on a easier product. I put the jack under the trailer hitch mount. Just lifted the body 1-2 inches and used a 12 mm socket . The socket removed the old ones and I hand tightened the new on. Literally took 10 minutes and a beer.
Great product! Bought these for my 2000 7.3 f250. Didn't want something that is constantly active like ras or hellwig since my leaf springs are new and rated for 4k pounds. Installed these in 1 hr super simple only hard part was the factory bump stop on driver side was a pain. Didn't install the puck they give due to height of truck and I knew more or less at what point I wanted them engaging. I haul cattle to shows/ auctions or between pastures with my 24ft big bend and these things actually provided a smoother ride in my truck loaded then unloaded.they do a great job with the added support and are better than an overload spring with handling sway and providing a smooth ride loaded. Just wish I could use the 3k pound rated ones on this truck and my dually but doesn't fit if you have a gooseneck sadly so will probably have to go with timbs on the drw. Over all great product can't speak to longevity but solid for the time being. And customer service with this company is excellent if you have a question or problem they're on top of it...hope they pay them as well as the reputation they're building for them.
I bought and installed the 1000lb Sumo Solo springs to help alleviate rear end squat on my 2024 GMC Canyon Denali when pulling my boat. My boat trailer has a long mono tongue with no weight distribution installed. The boat weighs in at about 5500lbs, the truck fender lip measures 38” high unloaded, once I dropped the hitch down on the ball and the Sumos picked up the load, the fenders measured 36.25” equating to an inch and 3/4 squat. Empty the Sumos have an apx gap of 7/8” above the frame rails. The Sumos were recommended over the Timbrens for my situation of infrequent towing with this truck and to maintain the best ride possible when not towing. So far my ride is virtually unchanged when empty and feels controlled when towing. Installation is straight forward but the instructions could be a little clearer with a diagram showing the intended location of the springs. Luckily an etrailer customer had already done the install and provided some pics so there was no question. I chose to remove the tires to have good access and I’d do it again this way. I supported the truck with a jack stand under the receiver. IMHO the proper method to locate the over frame upper clamp brackets is to push the forward clamp as far forward until it contacts the bed stiffener and you’ll be in the correct location then let all the hardware hang to position itself, tighten as required and enjoy.
Installed these right before a long road trip, and were impressed with how much the ride improved. Opted not to include the spacers, which has worked out fine. While not towing have not noticed any change to the ride, which is good. When towing the steering has a solid grip on the road now (sometimes felt a little loose before installing these) and no more issues with 'porpoising'. We drove across a several mile long bridge in the Bay Area that likely would have been a roller coaster ride previously, and had no issues. Quick and easy to install.
Put these on a Jeep Gladiator to haul a motorcycle to Sturgis. Kept everything level, good ride and stability. Highly recommend.
I had installed this model SumoSpring on my 2019 4Runner and had great results when towing the camper I had at the time. They greatly reduce the bounce when going over dips in the road at highway speeds. Now I have a 2021 Titan and a bigger heavier camper. I expect the same great results on the Titan. Installation was pretty straight forward and took about a half hour. The size difference between the OEM bump stops and the SumoSprings alone should give a better ride when towing my camper.
Product is great, exceeded my expectations. Install is simple and straightforward. It’s a night and day difference in both the body roll and the handling small bumps all the way up to off-road conditions.
Love them! The truck barely even squatted, had two dirt bikes, and a generator in the bed as well! It handles the bumps and sway great
I got the springs installed last week and wanted to have a drive time before I wrote the review.
The height of the springs are perfect for my 2016 Tacoma, They keep the truck stable and nearly eliminate the body roll I had before installing them. I am heading to the mountains in a couple weeks, so I will update the review when I get back. That way I will know for sure the body roll is gone and the truck is stable on the winding mountain roads.
The springs installed in no time at all and since I had the rear end apart, I decided to add the leveling blocks at the same time, to keep the truck from squatting with the gear I haul around with me.
The guys at etrailer are great. And while I did not call them to discuss this item, they have been very helpful in the past with all my questions.
Below are pictures of before, a couple comparisons and after. Sorry if they come out sideways.
These Sumo Springs were a great addition to my Tacoma and well worth the money, IMHO.
Opted for the Blue 1000lb Sumo's w/spacer over the 1500lb Black ones. 1500 Silverado Max Tow & reduces squatting by 2" on a 1000lb+ tongue weight. Ride is still good, but you can feel the Sumo's engage over large dips or bumps which is not an issue for me.
2025 Promaster 2500 159” wheelbase. Backed the van on couple 2” X 6 “ easier sliding under. Sprayed PB Blaster on top of bumper spring, using a 16” Channel Lock, easy off with the old. At that time I jacked the rear end to allow clearance. One side at a time. Took longer for set up then the job. I used the long bolt with two spacers. Have not drove yet, though looking for great results.
I put these on a 2013 Jeep JK (not lifted) that tows a 3000 lb trailer in rough terrain; Total game changer.
These replaced the anemic factory stops (which had completely disintegrated) and make it impossible to 'bottom out' on the dips and holes that use to beat up the suspension. I got nearly all of my vertical travel back and the vehicle now sits almost level under high tongue load.
They go on pretty easy. I suggest sliding in one side, and then using a wooden dowel and hammer to pop the other side in the stock receiver cup.
Highly recommended. These are a MUST if you are towing a trailer (with a medium sized SUV) of any significant weight or if you just want to be able to bounce hard without bottoming out your suspension. I am likely going to get the front suspension version now as well.
Wish I knew these existed sooner.
Worked perfectly for my 2020 Chevy express 3500 van
Sure does help driving ability. These motorhomes need all the help they can get.
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