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When the back end starts to sag from a trailer or heavy cargo, these SumoSprings Solo helper springs step in with up to 1,800 lbs of support at 50-percent compression. They keep your vehicle level so your steering, braking, and headlight aim stay right where they should be. Whether you’re hauling tools, gear, or towing something heavy, the springs help your factory suspension stay balanced and under control.
Rough roads and heavy loads don’t have to mean a harsh ride. The microcellular urethane material in these springs compresses easily for lighter loads and stiffens up as weight increases. That progressive load control smooths out bumps and cushions shocks while still giving firm support when you need it most. The result is a steady, more comfortable ride on any trip.
When curves or side winds try to push your vehicle around, each spring works independently to keep both sides planted. This reduces body roll and helps control sway so the vehicle feels more solid through corners, uneven terrain, or when you’ve got an off-center load in the back.
These helper springs are made from durable microcellular urethane that holds up from -25 F to 200 F. They resist oil, salt, and UV damage so they won’t crack or wear out easily. Since they don’t use air lines or tubing, there’s no pressure to monitor—just install them once and go. Their vertical compression minimizes side expansion so they fit safely in tight spaces without rubbing against other components.
Getting extra load support doesn’t have to be complicated. These one-piece jounce-style springs mount directly in place of factory bump stops with no drilling required. Each pair upgrades your rear axle suspension for better handling, less sway, and fewer bottom-outs every time you load up or tow.
Ratings & Reviews
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.
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.
Work awesome on keeping my Gladiator level while pulling my travel trailer!
Simple install on my 2020 Jeep Gladiator. These springs seemed to help when towing our travel trailer.
Easy install. Just raise the rear of the truck enough to get the old bumps out which was very easy, place a little dish soap on the sumo spring to aid in the install, lower the rear of the truck and the springs should pop right in. If you have a lift kit place a block of wood between the sumo and bump stop plate.
Easy to install on my Jeep Gladiator. I've used the Gladiator to pull a 23ft rv trailer also with the weight distribution hitch. The unit runs level without any squat. I think it is a good add on.
Super easy to install as I did not have to use any tools. Replaced the short foam bump stop from the factory.
I love the product very easy install. Big difference
For my 1024 jeep gladiator.Very easy installation. I personally found it easier to just go ahead and remove the tire, it gives you straight access to the installation point.
I have had these on my Jeep Gladiator for over a year now and I still like them. Sumo Springs really help with sag when towing my Scamp camper trailer and when the truck bed is loaded with stuff. When it is cold outside they are stiffer and I can feel when they hit the stops on hard bumps. Sumo Springs are a very easy overload spring option with factory lift.
Jeep Gladiator Mojave - swapped out the rear stock bump stops with these. High quality parts. Just jack up the truck enough to give you room to work with and put in your jack stands, no need to remove the wheels. I look forward to seeing how they do with towing! Hopefully I can update my review here afterwards. Check out the gap difference in the pictures. Should touch sooner during normal drive conditions and hopefully help reduce some trailer squat and help towing to be smoother.
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Todd
8/25/2023
A must have if you tow & haul to full capacity as I do .