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When you pile on the weight—like a camper, salt spreader, or loaded bed—rear sag can throw off handling and braking. The Timbren Suspension Enhancement System adds 7,000-lb capacity hollow rubber springs above the rear axle to help stabilize and level your ride. They provide extra support only when you need it, letting your leaf springs move freely under light loads while firming up automatically as weight increases.
Rough roads and uneven loads can beat up your suspension and make driving uncomfortable. These Aeon hollow rubber springs act as shock absorbers, cushioning bumps and rough terrain so the ride stays smooth and steady. The convoluted shape collapses progressively as the load increases—soft when empty, firm when full—so your vehicle stays comfortable and controlled no matter what you’re hauling.

Sharp turns or uneven cargo can make one side squat more than the other. Each Timbren spring works independently to support its side of the vehicle, helping keep things balanced even with off-center loads. This action cuts down body roll during swerves or quick lane changes and keeps sway to a minimum when passing trucks or driving through crosswinds.


Getting real load support doesn’t have to mean running hoses or compressors. This kit bolts onto existing frame points above the axle in place of the factory bump stops—no drilling required. With custom-fit brackets, included hardware, and no air pressure to monitor, it’s a straightforward install that’s ready to work as soon as it’s bolted up.

Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.
Hello, Steven here with etrailer.com. Today we're gonna be taking a look at this Timbren Suspension Enhancement System for your rear axle. Now these jounce stoppers, as they're called, are gonna improve your suspension, your handling, and your overall safety. They work really good for trucks that have like a sliding camper or maybe your spreading salt and that kind of stuff in the wintertime, these are gonna give you that boost of suspension to help you not bottom out, sag, and also keep your truck lights, tow vehicle lights, straight level where you want 'em. They are gonna improve the comfort of your ride and they allow the leaf spring ample movement and at it cushions light loads. That way, it's more rigid when the more weight is supplied, but when you have a light load, it basically is never touching your spring on the light load, so it's not messing with your stock performance.
Now this kit is gonna reduce rear sag, like I was just mentioning. They do work independently, side to side, so driver to passenger side. They will help to compensate for off-center loads as well. They will also reduce body roll when you have to swerve or maybe execute a sharp turn or something like that, they're gonna take the brunt of the bumps in the rough roads and they're gonna extend the life of your stock suspension. You will get two Aeon hollow rubber springs, the custom fit brackets for the frame of your particular vehicle, and you're gonna get all the hardware you need to make that install.
Now this is a no drill setup, so I've just kind of stacked these pieces. I'll kind of make sure you a close up of that, hardened steel, powder coated. Then you've got a little spacer block here. And then, of course, you've got the Aeon hollow rubber spring. So those simply get stacked, like so, and then they mount with the bracket on the frame of the truck.
Now it does come with a set of instructions as well. You're gonna get that. That'll help you with your install. And like I said, they are a limited lifetime warranty. They're rated up to 7,000 pounds capacity.
Never, never exceed your vehicle's weight carrying capacity. They will work with the suspension system that's in good working order. And there's no drilling required, whatsoever, so it's a pretty easy install. Now these are going to replace your current axle bump stops that are on your frame already. You'll simply remove those and these will replace it. Again, pretty simple install. Now these are a custom fit, so anytime we have a custom fit item, I recommend you using our website, year, make, and model, our fit guide on etrailer.com to make sure they're gonna fit your needs. This particular kit here that today I'm showing you fits a 1997 to 1999 Ford F-150 and F-350 Light Duties, and it also fits the 2000 to 2003 F-150s. Well, I hope that our time together today has been helpful for you. I'm Steven with etrailer.com. Thank you so much for joining me.
Ratings & Reviews

Jameson C.
11/5/2026
thats really great to hear!

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.



Loren
3/6/2026
No changes, zero issues or regrets!

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.

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.
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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?