SumoSprings Solo Custom Helper Springs - Rear Axle
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2016 Toyota RAV4
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2016 Toyota RAV4
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Heavy loads can make the rear end sag, which throws off steering and braking. These SumoSprings Solo helper springs add up to 1,400 lbs of support at 50-percent compression to help your suspension stay level and stable when towing or hauling. They absorb bumps and shocks so handling stays smooth and your ride height stays even.
These microcellular urethane springs compress progressively depending on how much weight you’re carrying. With lighter loads, they compress easily for a soft, comfortable ride. With heavier loads, they can compress by as much as 80 percent to give firm support and help prevent bottoming out. The result is a balanced ride that stays comfortable when empty and stable when loaded.
Each spring works on its own side of the vehicle, compensating for off-center loads and reducing body roll during sharp turns. That means more control when you’re cornering or driving in crosswinds. Whether you’re running uneven gear in the back or towing on a winding road, your vehicle feels planted and predictable.
The closed-cell microcellular urethane stands up to oils, road salts, and UV rays, performing from -25?°F to 200?°F. The springs compress vertically with minimal lateral expansion so they resist damage in tight spaces. They also require no air pressure checks or tubing—just install them once and drive knowing they’ll keep working trip after trip.
These helper springs are custom-fit and bolt on with simple hand tools—no drilling needed. Each kit includes two jounce-style springs that replace the factory bump stops to enhance load carrying ability, reduce sway, and improve ride comfort without changing your normal suspension setup.
Customer Satisfaction Score:
95% were satisfied with this product
5% of customers were not satisfied
Ratings & Reviews
Brent
10/22/2022
After 70,000+ miles of both highway and off-road driving with and without a trailer in tow, I am upgrading my original rating to 5-stars because the bluemedium SumoSprings have performed exactly as advertised and show no signs of degradation in either wear, appearance, structural integrity or any noticeable deformation after being hammered unmercifully by the tongue-weight of the trailer I frequently tow along with the “moonscape” off-road terrain and even worse conditions of the roads I usually travel . Even though the SumoSprings still lacked ¼” from being perfectly centered on my 2019 4-Runner’s rear axle housing after installing them as far forward as their elongated slots would allow, my assessment of the suspension’s compression arc moving the third-member a bit to the rear on its upward swing proved to be true since the “shiny spots” of the contact points on the rear axle housing are well-centered. Unlike a Jeep Wrangler with an extremely stiff “hay-wagon” ride and having “no butt” or cargo space that protrudes more than a few inches past its rear wheels to strike the ground after traversing a sharp terrain -off, the largerlonger 4-Runner with a more comfortable ride has a lot of rear body protruding past its rear wheels – especially with a trailer hitch draw-bar attached. The 4-Runner’s hard-rubber OEM bumper stops allowed almost 5-inches of upward rear suspension travel before “bottoming out” which occasionally caused the underhung spare tire or hitch drawbar to contact the ground in extreme off-road terrain -offs or sudden roadway dips when towing a loaded trailer. However, the SumoSprings worked magic because there was only ½” clearance between them and the rear axle housing under normal conditions, and the rear axle housing gently touched the SumoSprings when the trailer was hooked up – which almost completely eliminated rear-end squat on a sharp off-road -off or sudden roadway dip without making the 4-Runner ride like a hay-wagon, farm tractor, 1950 International pickup with overload springs, Jeep Wrangler, etc. in the process. After another 250,000 miles or so, I’ll put SumoSprings on my next 4-Runner – good show guys!!!
Russ
3/16/2025
The Sumo Springs have worked perfect, the motorhome has near zero sway and roll. When the similar goes past it doesn’t move. I heard Tiffin gas motorhomes that are new offer them as an option.
Kate F.
3/16/2025
Do you have a question about this Vehicle Suspension?
Condition: Installed
Notes: There are install marks from previously being test fitted. All hardware is included.
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Jenny N.
10/27/2021
Thank you for the detailed feedback. When the SumoSpring is installed you will want to position the bracket so that it is offset outboard towards the wheel. This product does have a limited lifetime warranty against defects.