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When the rear end starts to sag under a heavy load, steering and braking can get sketchy. The Timbren Rear Suspension Enhancement System adds up to 15,000 lbs of support above the rear axle to keep your vehicle level when hauling or towing. The hollow rubber springs sit right over the axle to help stabilize handling and maintain proper ride height without changing your factory setup. With the added resistance, weight stays balanced, steering feels steady, and your headlights stay aimed where they should.
Bumpy roads and uneven loads can make a truck bounce and jar both driver and cargo. Timbren’s hollow rubber springs act as shock absorbers that take the edge off bumps and rough terrain. Their convoluted shape compresses gradually—soft when lightly loaded, firm when the weight comes on—so you get a smoother, more controlled ride whether you’re running empty or fully loaded. The rubber construction also helps extend the life of your suspension by preventing bottoming out.
When crosswinds or tight turns push one side of your truck down harder than the other, each Timbren spring works independently to keep your vehicle planted. This independent action reduces body roll and helps compensate for off-center bed loads. The result is better stability on curves, less sway when a trailer moves behind you, and a calmer drive overall.
Adding serious load support doesn’t have to be complicated. The Timbren system bolts directly onto frame rails using custom brackets and hardware—no drilling required. Once installed, there are no air lines or compressors to deal with. The springs automatically adjust to load changes, giving you constant support without manual tuning or maintenance.
Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.
Hello everybody, this is Jeff at etrailer.com. Today, we're gonna take a look at the Timbren Rear Suspension Enhancement System. Now, this is a custom fit part, this is designed to fit the 1967 to 1999 Ford F-800 trucks, and on a custom fit part like this, I do recommend for you to go to our website, use the fit guide, put in your year and model vehicle, and it'll show if this will work for your application. Now, this kit here will improve the suspension, the handling, and the safety of your vehicle. It does provide additional support as needed, so you always have a nice, smooth, comfortable ride, it'll allow the leaves spring ample movement while cushioning any light loads, so it does not affect the empty ride of the vehicle, and it will become more rigid as more weight is at it, so this will increase the stability, provides greater performance while hauling heavy loads, even helps reduce vehicle sag. Now, these do work independently side to side, they do help compensate for any off-center loads, help produce body roll when swerving or turning corners, and they'll even act as shock absorbers, taking the brunt of any bumps and rough roads, helps extend the life of your vehicle's suspension.
Now, this does include two Aeon hollow rubber springs, the two vehicle specific mounting brackets with the hardware for a nice, simple installation, comes with a nice set of instructions that'll describe how this goes together, and it does install directly onto the frame of the vehicle, there's no drilling required. Few specs on this, the capacity on this is 15,000 pounds. Now, these Timbren springs will not increase your vehicle's weight carrying capacity, so you do wanna make sure not to exceed the manufacturer's recommended weight limit. And these also are designed to work with a suspension system that is in good working order. But that should do it for the review on the Timbren Rear Suspension Enhancement System..
Ratings & Reviews
Christopher H.
8/14/2026
Love hearing this! Really appreciate the detailed feedback and photos. That extra stability when you're loaded up can make a huge difference. And installing them at 11 at night—that's commitment. Hope they treat you just as well on those mountain roads. Safe travels and we'll definitely make sure Dee Dee gets the shoutout.
Lazer S.
8/19/2026
Glad to hear they are working well for you, Ryan! Now that they are on, where you headed?
Jay S.
8/14/2026
Now that its been a year Im very impressed with them. Theres no ride detriment without the 5th wheel attached and they do a great job of mitigating squat
Christopher H.
9/3/2026
Happy to hear the Timbrens are making that big of a difference Tony. Thanks for including the photo and we appreciate the kind words! Have you taken any longer trips with the Timbrens installed?
Jesse M.
9/10/2026
Awesome! Glad to hear the Timbrens made such a big difference in the ride quality. Thanks for sharing! Happy travels!
Brooke M.
5/7/2025
Wow, thank you for sticking with us, Don! That is awesome. I think you made an excellent choice here. Timbrens are tough and the heavy duty are SUPER tough. Glad to hear these were a good fit. Love the photos! Is that your own property?
Don
5/21/2026
The TIMBRENs work as stated during when I am pulling anything heavy. However, when the truck is not pulling anything, anyone riding in the rear seat gets a very hard jarring jolt when driving over any roadway repairs, bumps, expansion joints on bridges. I wished that I would have went with the Super Springs, or the Road Active Suspension. I may replace the TIMBRENS later.
Gwendolyn Y.
5/21/2026
Kate F.
5/6/2026
Glad to hear the Timbren systems worked out so well for your RAM Van Mitchell! It’s great that you noticed the smoother, more progressive response compared to the factory bump stops, especially under load. Thanks for sharing your experience with both the front and rear installs, that’s really helpful for others considering the upgrade. What kind of loads are you usually hauling with your van?
Lazer S.
6/16/2026
They definitely look like they are helping, Orlando! How are they when you aren't towing? We hear a lot of people say they can be pretty harsh when unloaded.
Kate F.
7/13/2026
Bud, thank you so much for taking the time to leave a review! I'm glad to hear the suspension upgrade helped reduce the sagging and porpoising while towing. I also really appreciate you including the installation pictures and sharing your tip about removing the rear wheels. I'm sure that will help the next person tackling the install. Thanks again for choosing etrailer!
Heather A.
4/24/2026
Hi there, thanks for reaching out, that’s actually a common issue with this type of trim. The one you tried is a standard flat insert, but some RVs (like your NOBO) use a slightly domed trim to help it sit over the screw heads in the track. If the screws stick up even a little, a flat trim won’t fully snap in place, which sounds like what you’re running into. The best way to find the right replacement is to remove a small piece of your original trim, lay it flat, and measure the full width from edge to edge. Most are either 3/4" or 1", but the shape matters too, not just the width. If yours has that domed profile, you’ll want something similar or a softer vinyl that can flex over the screws. If you’re able to send a quick photo of your track or old trim, I’d be happy to help you find a better match.
Mike L.
4/2/2026
Glad to hear they worked well for you Jerrod. Hope you had a good trip!
Mike L.
4/23/2026
Niiiice, I see what you did there!! That looks like a sweet setup!
Mike L.
4/23/2026
Lazer S.
7/20/2026
Glad they are working well for you, Kevin! Well, while you are towing, that is. We have heard that these can be pretty rough when unloaded, but work great when you are loaded. A quick release function on these would make taking them off when not towing a lot easier. I may pitch that to Timbren to see if they can work something out. I will tell them to call it something like the Kevin Device if they agree! ^___^ Sounds like quite the trip! What has been your favorite stop so far?
Mike L.
2/26/2026
Thank you Darrell, we're glad to hear your Timbrens are still on the job!
Kate F.
4/23/2026
Thanks for sharing your experience Thomas. It is great to hear the Timbrens made a noticeable difference in ride quality and reduced body roll on your E350 Class C. We also appreciate the heads-up on the install. That kind of real-world feedback about brake line clearance is very helpful for others working on a similar setup. Would be nice if they had a stronger option, if you need the 5K, might need to go to airbags, but who wants to deal with having to air up if you don't need to. Where are you off to on the next adventure?
Mike L.
7/7/2026
Nice setup David, thanks for the photo!
Kate F.
5/6/2026
Glad we had the right suspension upgrade to help with the squat Dennis! How is the ride when you are unloaded?
Kate F.
8/31/2026
With the Timbrens, you will want to have a 1/2" to 1-1/2" gap when the vehicle is unloaded. They are only designed to engage when the suspension is under load and you need the additional support. If you want to reduce that gap so the Timbrens engage sooner, you can add the 1/2" Spacer # TA25722-90P00 or the 1" Spacer # A25723-90AH00.
Kate F.
8/31/2026
I am happy to see we had some suspension support for you Benjamin! What kind of trailer are you towing?
Heather A.
2/21/2025
Timbrens are the best for sag because they are made of dense rubber. 6500 lbs sounds like one heck of a travel trailer, what is it? Any fun plans this summer?
Jerome
3/2/2026
Awesome product. Would recommend.
James D.
7/24/2026
We're glad to hear the Timbren suspension system is already making a difference. We'd love to hear how it performs over time. What are you using your vehicle for most often; towing, hauling, or everyday driving? Thanks for your review and we appreciate you choosing etrailer!
Claire H.
7/14/2026
Wow! That is quite a difference between your factory bump stop and the Timbrens! Definitely let us know how they perform for you!
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Robin H.
9/22/2026
Thanks for taking the time to share such a detailed review and all of the pictures! The unloaded ride is a concern we hear fairly often with SES upgrades, so your experience with the 1" gap and rough-road testing will be really helpful to others considering these for their F-250. We appreciate the kind words about Naomi and our team as well. Looking forward to your update once you get some miles on them with the Rockwood!