Timbren Suspension Enhancement System - Severe Service - Rear Axle
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2007 Toyota 4Runner
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2007 Toyota 4Runner
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When you’re hauling a slide-in camper, spreading salt, or towing heavy gear, rear-end sag can throw off your stance and steering. The Timbren Suspension Enhancement System uses 10,000-lb capacity hollow rubber springs mounted above the rear axle to keep your vehicle level and stable. They add support as weight increases, reducing squat and keeping handling predictable when the load gets serious.
Bumps and washboard roads can beat up your suspension when you’re loaded down. Timbren’s Aeon hollow rubber springs absorb most of that shock before it ever reaches the frame. The elastic rubber cushions light loads for a comfortable ride, then stiffens under pressure to prevent bottoming out on rough terrain. You get a smoother, more controlled ride while extending the life of your factory suspension.
Sharp turns, crosswinds, or off-center loads can make a heavy rig feel unsettled. Each Timbren spring works independently to support its side of the vehicle, cutting down on body roll when swerving or cornering. That independent action also helps balance uneven loads so you stay steady through curves and when entering driveways or uneven ground.
Installing the Timbren system is straightforward with included custom brackets and hardware. The brackets bolt onto each frame rail above the rear axle and replace the factory bump stops—no drilling required. Once mounted, the springs sit about 1" above the axle so your stock suspension handles light loads normally while the Timbrens stand ready for heavy work.
Unlike air systems that need compressors or hoses, these solid rubber springs need no maintenance or manual tuning. Their progressive design naturally adjusts stiffness as they compress—soft when unloaded and firm when loaded—keeping you level and in control without gauges or pressure checks.
Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.
Hi, everybody. Andy here with etrailer.com, and today we're gonna take a look at this Timbren Rear Axle Suspension Enhancement System. Now, this system is designed to fit your 1975 to 1980 Dodge full size Pickup D350, the pickup and the cab and chassis. And then the 1975 to 1980 Dodge full size Pickup W350, and that's the pickup and the cab and chassis. And then the 1981 to 1993 Dodge Ram Pickup D350, and that's the pickup and cab and chassis. And then, finally, the 1981 to 1993 Dodge Ram Pickup W350, and that's the pickup and cab and chassis.
Now, these hollow rubber springs with a 10,000 pound capacity are going to sit above your rear axle to help stabilize and level your vehicle. These springs are ideal for trucks with slid-in campers, or an in-bed salt spreader, and they're going to improve your suspension, handling and safety. These springs also provide additional support as needed, so you can always have a smooth, comfortable ride, letting the leaf spring, giving the leaf spring, rather, ample movement, while cushioning light loads. Now, these are going to ride just as smoothly when you're not hauling the load. They become more rigid as more weight is added for great performance when you're hauling a heavy load, increasing stability, and reducing vehicle sag.
These work independently, adjusting side to side, helping compensate for off-center loads, and reducing body roll when swerving and turning corners. Now, these springs also act as shocked absorbers, taking the brunt of bumps and rough roads, extending the life of your truck suspension. So, this kit includes everything that you see here in front of me on my table. As you can see, I just kind of have the hardware loosely in place, just to kind of give you an idea of where most of the hardware is going to go. So, this is going to include everything that you need to install these.
You're gonna get these two AEON hollow rubber springs, and then the vehicle specific brackets, and the hardware for that simple insulation. What's nice about the insulation on these is there's not gonna be any drilling required. They're going to actually replace the axle bump stops on the frame of your truck. Instructions are included to walk you through the step-by-step installation process. And again, these have a capacity of 10,000 pounds, but it is important to note that these Timbren springs will not increase your vehicle's weight carrying capacity, so you want to make sure that you do not exceed your manufacturer's recommended weight limit.
These do have a lifetime warranty from Timbren. And that's gonna conclude our look today. I do hope that it was helpful for you. Again, my name is Andy. Thank you for joining me.
Ratings & Reviews
Tom E.
8/9/2026
Still working great! No issues. Other than being dirty, they look and perform like new.
Jerred H.
8/9/2026
James
7/27/2026
So far they have been fine. They are part of my suspension upgrades, along with stable loads and sway bar. I wasnt worried about harder ride when camper off, I wanted best suspension when camper was on. I would definitely recommend them.
Charles
2/8/2026
Excellent product. Does exactly what they were designed to do. I removed the sever duty extension. Now the ride is soft when unloaded. But yet smooth when towing or loaded heavy.
Andrew N.
2/9/2026
Scott
5/9/2026
They work great and are holding up well after a year in service on my 2011 F350 SRW hauling my Lance 855 truck camper.
Loren
3/6/2026
No changes, zero issues or regrets!
Bryan L.
12/11/2017
The air springs have performed flawlessly ,very pleased with the product and performance ! As a matter fact I was recommending this product to a friend the other day.
Brandon
5/11/2021
After a year of towing some kind of trailer every week, the bump stops are showing some wear from riding on the bump stop pad on the axle. That being said, they are still working as intended and as good as the day I installed them. After a lot of miles, the only draw back is driving around with no trailer. Normal driving the ride isn’t effected but when you hit a bump in the road you really feel it hit the bump stop. You loose a fair amount of rear suspension travel with these but I’m used to it now.
Eduard
12/11/2025
Great! After 20,0000 miles, Timbren Still keeps my truck Level and stable towing heavy loads.
Jimmy
1/5/2022
I am not sure when I will be able to have a load on it to confirm, as I do not have a camper just yet. I am currently working on upgrading the suspension in preparation for one. Is there an alternative similar solution, other than airbags - as I dont want those, that can be run? With a similar weight capacity? Kind of interesting Timbren hasnt run into this issue before with the older Ram 3500s. Wonder if this is somehow unique to my truck? All the rear components are original OEM, so it seems kind of strange.
Jenny N.
1/5/2022
You mentioned that the jounce bumpers were touching up against the lift blocks without a load in the truck and I wondered if you could send a picture of the installation?
Jenny N.
1/5/2022
I do have additional questions for you. Is the top picture showing how the springs look with a loaded weight? Have you already installed your slide in camper? I wanted to see if the top bracket were touching as well? The manufacturer is trying to determine if a smaller diameter spring would help or not
Jimmy
1/5/2022
Both pictures are right after installation with a completely unloaded bed. Since installation, I have not had weight in the bed, so I can not 100 say if the top brackets would touch the U bolts or leaf springs. But from looking at it just now, it appears the top bracket would just barely touch the U bolts with a loaded bed, and would definitely touch if there was side to side movement with a loaded bed like going over a speed bump, pot holes, or uneven terrain.
Jenny N.
1/5/2022
I did hear back from Timbren. Currently there is not a bracket that would be narrower that they can offer. When loaded if the brackets interfere with the smaller spring, then it may be advisable to return the kit.
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Heather A.
5/26/2026
Wow, that is exactly what we love to hear about these springs! That is a serious camper. Any plans with it this summer?