To see if this custom-fit item will work for you please tell us what vehicle you'll use it with.
When heavy loads or trailers weigh down the back end, these SumoSprings Rebel helper springs step in with up to 5,000 lbs of rear axle support at 50-percent compression. They keep your ride level so steering, braking, and headlight aim stay right where they should be. The urethane springs absorb bumps and shocks to smooth out the ride and help your factory suspension handle the extra weight without sagging or bottoming out.
Every trip isn’t loaded the same, and these springs adjust automatically. With lighter loads they compress easily for a softer, more comfortable feel. As weight increases, they stiffen progressively—compressing by as much as 80 percent for strong support under heavy cargo or towing. The two-piece design lets your suspension move freely when unloaded, giving you a smoother ride whether you’re hauling gear or driving empty.
Uneven loads and sharp turns can throw a truck off balance, but each SumoSpring works on its own side to keep things even. That independent action helps cut down on body roll and sway through corners or gusty highway stretches. It also compensates for off-center weight so your vehicle stays planted and predictable on rough or uneven ground.
These maintenance-free helper springs are made from microcellular urethane that resists oils, road salt, and UV rays while performing in temperatures from -25°F to 200°F. They expand and compress vertically with minimal side growth, so they won’t rub against nearby parts. With no air lines, compressors, or adjustments to worry about, you get reliable suspension support that just works—mile after mile.
Installation is straightforward with the included brackets and hardware—just bolt them in place where your bump stops sit. There’s no tubing to run or air pressure to check, making these a clean solution for anyone who wants better stability without extra maintenance or complicated setup.
Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.
Hi there, heavy haulers. Today, we're going to be taking a look at SumoSprings' line of Rebel Custom Helper Springs for the rear axle. You'll want to use our fit guide to help determine the appropriate spring for your vehicle. The weight capacity of the springs are going to vary between 2,600 and 5,000 pounds, and there may be more than one set for your particular vehicle with different weight ratings, so you could choose a softer or a more aggressive, more supportive one, if you want.SumoSprings are designed similarly to a jounce bumper, which goes between your frame and your axle, except our SumoSpring here is significantly larger. This is a two piece design, so that way we have maximum travel when extending our suspension. With a jounce bumper, you only get compression support once your suspension is completely bottomed out.
It's just that last little bit that the jounce bumper comes in to prevent any contact between the two components.With our SumoSpring here, it's going to compress throughout the suspension travel as it goes down, and it will receive a maximum load level support at 50% compression. The load leveling capacity that this SumoSpring has, it doesn't increase the maximum carrying capacity of your vehicle. This is just how much it can help assist supporting because as the back of your vehicle is down and the front of the vehicle lifts up, the geometry of your tires change, and that's going to change how much contact the tire has on the road, the amount of surface area, and it does help change how much the weight transfers to the front of the vehicle as well.If you're heavy in the back, it's not going to transfer as properly as it would before, and most of the braking is done with your front brakes. So if the weight can properly transfer onto those, you can get a shorter stopping distance as well. So what this really means is that when you load down this spring, it's going to help smooth out your ride.
It's also going to help level out your ride because your suspension is not going to be sagging down as much in the back because our spring is going to be help assisting, helping us stay at that normal ride height, which is going to help restore loss of breaking, and handling performance.And another benefit of having your vehicle's ride height level back out is that your headlights are going to be pointed back down towards the road instead of up at the sky, so that'll help improve your visibility at night, and here you can see what our SumoSprings are going to look like when they're now under load. They have contacted one another and compression has begun. They're barely compressed right now because we don't have a crazy load on it right now, but the more we would load it up, the more it would compress, and this is going to work with your suspension system. So it's helping to not only keep your vehicle's ride height where it should be, but it's also going to help extend the life of your suspension components because they're not going to be working as hard, because they have the assistance of the SumoSpring.And since our springs work independently with one another, they can help offset uneven loads because you're going to have the support from each one on its own side, and it can also help reduce sway because as you start to sway and the spring wants to compress, it's going to want to push it back up, and then it's going to try to go this way, but this spring also wants to stay at its normal position. So when it starts to compress it again, it's going to push it back up and that can help minimize the back and forth oscillations you get when going down the road.
This is particularly useful when you have an evasive maneuver, or a heavy crosswind, or maybe a semi blows right by you, and they start to joscillate, it's going to help be a little more stable for you.Unlike airbags, these are going to be completely maintenance free because they're constructed of a microcellular urethane that's protected against UV rays and road grime. So you don't have to worry about oils and all that stuff on the road, breaking them down, and since there's no air or anything on them, it's just done based on the compression. Once they're installed, they do their thing, and that's it.Airbags are a great option for suspension enhancement. The issue with airbags though, is that you do have to constantly maintain them. When you're unloaded, you want to make sure you've got them down, usually around five pounds, to ensure a good ride quality, but then when you load it up, you'll want to increase that air pressure to help support your load.
Now, if you don't have a compressor on site, when you load it up, you'll have to predict how much air pressure you're going to need before you reach your destination and load it up, and as the temperatures change outside, the pressures in your airbags can change as well. Especially here in the Midwest, when we've got days that can easily change 20 degrees plus or minus, your airbag pressure can drastically change on you as well.That being said, with the SumoSprings here, you just get what you get. There's no further adjustments that you can make for the weight that you're going to be hauling, but if you want to save some time on the installation and have something that is going to be on your truck every time you need it, without having to worry about it, SumoSprings is going to be the better option for you.Before we begin our installation, we're going to go ahead and simulate a heavy load. We've got a water tank here with about 2000 pounds of water weight on it. We've got it on our trailer, hooked up to the back of our vehicle, so we know we've got the back loaded down plenty good. We're going to hit our test course, see how the vehicle rides, then we'll install the components and we'll retest and verify that we've made some substantial improvements.All right, we're heading in to the test course, but before we even get there, I can already feel the backend is down and the front end of our vehicle's pointed up. So our headlights are pointed up, and we know that we're not driving the way it would normally sit. We're going to now hit our uneven bumps section first. This is going to rock us back and forth, and it's going to mimic things like hitting a pothole, and the vehicle's fairly stable, but we definitely feel the bumps when we're going over them.Next, we're going to be going into the even bump section, and this is going to simulate a speed bump, and here we're going to have our forward and backed motion, and I expect once we get some suspension in the back, it's definitely going to help out with how much bouncing we have there in the back, should also help even us out as far as leveling out our ride.Lastly, we're going to be heading over to our slalom section, and this is going to simulate performing an evasive maneuver, and I expect this one here should be pretty drastic differences, once we've got our suspension enhancements installed, and you do feel a little bit of sway here. We can kind of really see it in our trailer in the back. Once we get some suspension enhancements on here, I definitely expect that to be minimized.We're now hooked back to our trailer again, all loaded up. We've got our SumoSprings installed, and I can already tell that our truck doesn't seem to be dipping down in the back as much as it was before. We're going to enter the test course and see how it feels.It does feel a little bit stiffer of a ride when we we're unloaded, but now that we've hooked the trailer up to it, it seems two heads helped smooth that out. So if you're somebody that constantly has their vehicle loaded up, then I would definitely recommend these. If you're rarely loaded up, then you may want to consider another option because it does seem to stiffen it up a little bit when we're unloaded.We're going into our even bump section now, and boy, does it really make a difference here on how much we bounce up and down. It feels a lot more stable. We hit our pothole section before that and it wasn't too noticeable difference. It did seem like it helps stable us out a little bit, and lastly, we're going to do our slalom section now, and our SumoSprings work together with one another. So as one compresses, it wants to push back. So that helps to also minimize sway that we would get. When we get to our slalom section here, that's one of the biggest issues that you get when turning with evasive maneuvers is that you start to get that body roll and it starts to sway.Oh man, and it made a huge difference in the sway. It almost completely eliminated it. It definitely feels a lot more stable when we're just kind of whipping it nice and fast. You don't really feel the weight kind of throwing us around as much as we used to, it just feels like we've got a lot more control, that the body's not tipping over as we're doing that, and that's pretty crazy considering that we're hauling water back there. So when you start to whip it, that water all wants to slosh to one side. So that usually makes sway even worse due to what we're hauling.In summary, Rebel Custom Helper Springs are a great option if you're a frequent heavy holler, and want to get the most out of your truck, and that completes our look at SumoSprings line of Rebel Custom Helper Springs.
Customer Satisfaction Score:
88% were satisfied with this product
12% of customers were not satisfied
Ratings & Reviews
Awesome ride feel. Easy installation all accept for one bolt that is almost impossible to get tight even with multiple wrench angles. Overall with instructions provided it was a fairly easy install.
Install was easy and loaded ride is improved.
Unloaded ride is terrible. It's so stiff that I'll likely remove and purchase a different product. I called Sumo Spring twice and was not able to reach anyone. I also left a message (2 days ago) and no one returned the call. I was calling for advice or return. The 30 day money back guarantee is useless when you can't reach the manufacturer.
The sumo shocks arrived faster than was told. Fantastic products and great customer service! Nicole who took my order was great! Thanks again Nicole you are exceptional in the customer service dept. at Etrailer. Second time ordering from them out standing company and great employees, You Rock!!!!!
Just put these on our 2014 F350. We have a 40’ fifth wheel and on a 400 mile trip. So far so good!
Install was easy. Took about 2 hours start thru cleanup.
The truck is very bouncy now unloaded. I think the money is better spent on air bags.
Very easy install and product worked great. Helped most with leveling my truck while loaded with my camper. Body roll was still there but these definitely reduced it. Would definitely recommend this product.
Adding a pair of SumoSprings to the rear axle of our 2015 F250 did little to help level the vehicle when hauling 500 to a 1000 lbs of feed or other materials. When pulling a bumper pull tandam trailer with a UTV, tractor, etc.,these springs did not hold the pickup level. We have since replace the leaf springs with OEM parts and all is better. The SumoSprings is a very good idea however did not solve our concern and probably should have saved the cost and replace the leaf springs first. Please note that this F250 does not have a goose neck hitch and it is rare to be overloaded. We use a one ton for those loads. Thanks.
nice improvement when 5th wheel is hooked up. maybe half inch ride height improvement. bumps and potholes are dampened nicely, not eliminated but not harsh and smoothed as should be.
The installation went very well. The ride seemed smooth.
I haven't had the springs under load, yet. I'm sure they'll perform as expected. I was not able to adjust the driver's side springs so that they align correctly. (see pic). The bottom spring does go into the top spring, but it's off enough that over time it will be an issue. Passenger side is spot-on! I have a 2024 F350 Tremor
took about 2 1/2 hours to put them on. Love them!! Trailer sits level and truck still has it's proper angle to the road!
Ride is great unloaded. They don’t touch until you load the truck with a little weight. On a light trailer 16ft or 20ft car hauler they just touch. The ride may be a little stiffer in the rear since there isn’t much weight to keep them down or the bounce down. But it’s not bad at all. Hauling a heavy load where they get compressed the load is much more stable and the truck hauls the heavy loads MUCH better. Cheaper than air ride. No lines to run. No worry to inflate or deflate. I give them 10/10. Very nice product. If you run light loads more than heavy I would go with the blue or yellow versions. I have the 5k sumos on a 2018 Ram 3500 4x4
100% satisfied.
Still too new for me to review how the product works, but in terms of installation, I had a lot of issues with installation on my 2015 Ford F150. Everything I saw made it sound easy for self install by one person, but was pretty tough self install for me. I'm not an expert on vehicles, but generally pretty handy and I had trouble doing it by myself and took at lot of time.
Difficult parts were attaching the upper mounting bracket to the frame, and getting the bolt through a washer and into a mounting piece that I had to insert into the frame
Couple of notes. My truck is a 4x4 and the instructions said to mount the upper bracket in the bottom holes for 4x4's, but that was not possible as it wouldn't fit. After talking to manufacturer, they said it was ok to mount in the the upper holes that was supposed to be for 2wd models.
The instructions don't mention using lock tight on all nuts, but I had one the the sides come off and lost some pieces. After getting a warranty replacement, the manufacturer said to use lock tight, even though it wasn't noted on instructions man. They said in newer instructions, it adds that, but that wasn't included in the product I received
Hoping I will like the ride when I connect and use on my trailer and will reserve judgement till then
I wish I would have put on an air ride system instead. When I put my light (1750lb.)truck camper on my F250 truck, the back of the truck saggs. Not happy! I am sure the product is okay, just not what I wanted.
It’s a fantastic product and shipping was right on time. Thank you so much etrailer.
Just Installed my Sumo Rear Springs. They went in real easy on my Dodge Ram 3500. The thing that took the most time on the install was jacking up the frame 3-4" to make enough space between the axle base and top of frame to slip in the entire lower and top sections of the Sumo Springs. Once I did that, I narrowed that space by letting the frame down a little but not all the way. Just enough to catch the receiving spring and leaving a half inch gap between the two sections. This allowed me to easily rachet the bottom u-clap without a problem and keep good alighment. I know I'm going to love this product once I hitch up. No more 2' drop in the rear end once hooking up to my 15k 5th wheel. These springs are stout but no so stout I'll beat the hell out of my body when hunting the rutted roads of the great North West. Thank you Jessie for your expertise and steering me toward the perfect application to meet my pulling and off-road needs.
I put a small leveling kit in my 2500hd Silverado. I noticed afterwards towing my excavator or dump trailer I was getting some rear sag when I had my trailers loaded heavy. I considered doing air bags for the rear. Instead I installed the sumo springs. I installed them in about an hour. Very happy with them. No noticeable difference in ride quality while empty. And they keep my truck level when I’m hauling my trailers. 5 stars!
Product works very well. Only problem we had was an alignment problem on the drivers side spring. Couldn't get it completely centered top to bottom, but was close enough to still fit together.
I installed on 24 Silverado 2500hd. Install went great. They work well when towing. I haul a 32’ bumper pull camper. They help reduce the sag dramatically. When not hauling, the truck rides rougher than without them installed. That makes sense and I am happy with them. I may have went with a bit less stiffness now that I know.
Sumo rebel Springs are in contact with each other when unloaded. The factory overloads are still 3 inches from touching the frame supports. This is not what was advertised for this setup
The product did a good job in reducing body roll in the 2025 Winnebago View 24t. The instructions were less than helpful - they need to be rewritten for better clarity, orientation, and specificity for the Mercedes 2023 Sprinter 3500 XD AWD. I had considered Timberens, but I think these will do a better job in the long run.
I replaced both the front and rear helper springs. The tolerances on the front were really tight - doable but really tight. Don't have any suggestions for getting the springs bolted on other than to be patient, it's a tight fit and smaller hands would have helped, but no such luck - it just took patience. No big surprises, basically remove and replace - just be cautious on raising and lowering the front end. Wheel blocks and frame supports are mandatory for safety.
As far as the rear helper springs, the designers planned for the potential rerouting of lines on the left side of the coach quite nicely. Takes some time, DON'T lock tite anything until installation is complete, run around the block a couple of times, and readjusted for fit. The factory frame bumpers can be removed very easily with a pair of channel locks, rather than messing around with screwdrivers and prybars. Takes all of two seconds and the bumpers were removed without damaging the bracket.
Communications with etrailer were great, probably overthought the project a bit but the representatives were great in keeping my thoughts corralled. The installation took longer than I expected but it was great fun, so who really minds additional time to do the job right.
With the new Sumo Springs my Sprinter is an amazing highway cruiser. Drives like a dream! It's a little rough on potholes, but overall a great purchase.
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