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Heavy loads or tongue weight can make the back of your truck sag and the front end lift, throwing off steering and braking. The Timbren Suspension Enhancement System – Severe Service – Rear Axle adds solid support with 5,000-lb capacity hollow rubber springs that sit above the rear axle. They work with your factory suspension to keep the truck level when hauling gear or towing, improving handling and stability without changing the ride height or alignment.

The hollow rubber design cushions bumps and rough terrain so you don’t feel every jolt in the seat. The convoluted shape collapses progressively—the more weight you add, the stiffer it gets. That means a comfortable ride when empty and solid control under a heavy load. The rubber also helps take road shock off the leaf springs, protecting your factory suspension from bottoming out.

Each Timbren spring works on its own to handle side-to-side weight. When a curve or crosswind tries to push you around, the springs resist body roll and keep the truck planted. They also help when loads are off-center, keeping both sides balanced whether you’re turning into a driveway or cruising down the highway.


This system bolts directly onto the frame with custom-fit brackets and hardware—no drilling needed. Once installed, it’s ready to go with no airlines, compressors, or gauges to maintain. The setup is simple, durable, and built for years of dependable load support with a lifetime warranty.


Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.
Today we're gonna be taking a look at a popular upgrade for your pickup trucks. It's the Timbren Suspension Enhancement System. All you gotta do is put your vehicle in the fit guide, just to get the kit that'll have a custom bracket so it'll fit the truck. There's a lot of different ways that you can beef up your suspension and a lot of options on our site. But I like these the best, because it literally took me maybe 15 minutes to install. So if I we're to compare this to airbags, airbags are kind of a pain, you have to run airlines you probably need a compressor.
And if you don't get a compressor, you gotta run out and air them up. They're a little bit more customizable, but you don't really have it completely dialed in. With this, the stop is exactly where it is, and as your suspension starts to sag, it'll kick in right away and there's a lot less maintenance and it's the most cost effective way to kinda beef up your suspension. So if you want my opinion, this is the way to go. So here is what we added today.
So we basically just replaced the factory bump stops. So there's a lot of different situations where we're gonna really need these. We'll notice the gap down here. We're gonna have a lot less of a gap than we did with the factory system. So, if your vehicle sags under a load whenever you have a lot of stuff in here.
You have a 450, you're planning on doing some pretty big stuff with it, so a lot of the times it'll make your headlights just go way up bright and you're blinding everybody that you're driving against. Also with less of a load on the front wheels, we are going to have a little bit less good steering and handling just because of the weight transferred to the back. So, you bought a big old truck, you're planning on doing quite a lot of heavy hauling, so this isn't going to increase our capacity of our truck. It is gonna have a limit of 12,000 pounds, but it is going to do a lot for you, what Well, a lot of that sag whenever you have a lot of load in the back, what happens is it starts going like that. One, you're gonna be that guy on the highway that everybody's flashing lights at because once your front end starts to raise, it's gonna look like high beams and you're gonna be blinding everybody.
You don't wanna be that guy, trust me. Also, whenever that weight kinda transfers to the back, there's gonna be less weight on the front. So less weight on the front, that's what steers. We're not gonna have near as good of handling as if we have these on, and it's a little bit more level to where we keep the weight kinda distributed a little bit more. Also with the leaf springs, they're gonna engage a lot quicker with the Timbren Suspension System. So your leaf springs aren't gonna be working a whole lot. It's gonna limit trailer sway and all sorts of stuff. So if you really just wanna kind of protect your truck and just make the whole riding experience a little bit nicer, it's definitely the way to go. Whether you're hauling with a ball mount, or a gooseneck or fifth wheel, it's not gonna have any interference with the gooseneck or fifth wheels in the bed of your truck. So you don't have to worry about that. Some of you guys we're wondering, and Adam's saying, it's not gonna be a problem. So one, I like the black color, 'cause it doesn't really stick out like the factory ones. And also these are a lot smaller than the ones we put on here, there's only about a finger's length in between there. So they're definitely gonna engage even with some of the lighter loads. And that'll do it for a look at the Timbren Suspension Enhancement, and I'm Adam with etrailer..
Ratings & Reviews

Tom E.
8/9/2026
Still working great! No issues. Other than being dirty, they look and perform like new.


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.



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.

Eduard
12/11/2025
Great! After 20,0000 miles, Timbren Still keeps my truck Level and stable towing heavy loads.
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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?