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When you’re hauling heavy gear or towing a big trailer, rear-end sag can throw off your steering and braking. The Timbren Rear Suspension Enhancement System adds up to 8,600 lbs of load support above the rear axle to keep your truck level and controlled. The hollow rubber springs automatically stiffen as more weight is added, helping eliminate squat and keeping the ride height even under serious load. That means better traction, steadier handling, and confidence when you’re towing or hauling heavy.
Bumps and uneven pavement don’t have to beat you up. Each Aeon hollow rubber spring cushions road shock and takes the brunt of vibration before it reaches the cab. The rubber design acts like a shock absorber, softening the ride while protecting your factory suspension from bottoming out. You’ll feel less bounce over rough roads and reduced wear on suspension parts thanks to the progressive spring design that flexes easily with light loads and firms up as weight increases.
When a gust of wind hits or a curve tries to push you off line, these springs go to work individually on each side of the vehicle. The independent action helps control body roll and keeps the truck planted through corners or when carrying off-center loads. That same stability carries over to your trailer—less sway gets transferred back through the hitch, helping everything track straight and smooth down the highway.
Adding serious load support doesn’t have to be complicated. The Timbren kit includes 2 Aeon hollow rubber springs, vehicle-specific brackets, and all required hardware for a straightforward bolt-on install. It replaces your factory bump stops with no drilling required. Once installed, there’s nothing to adjust or maintain—just dependable support that engages only when you need it, so your ride stays smooth when empty and stable when loaded.
Customer Satisfaction Score:
96% were satisfied with this product
4% of customers were not satisfied
Ratings & Reviews
No complaints with Etrailer customer service and delivery time. I thought I would need the spacer, and while putting everything together to check the fit, the bolts were not long enough. I drove to hardware stores for longer bolts. Well I did not need the spacer, and wasted some time. The stock stops were a bitch to take off. The only method that worked was tie wrapping pliers to the stops to grip in order to turn the bolts. The Timbren stops went on very easy. I hooked up my trailer for a drive. The truck does not sag and does not bump up and down as before. I drive a 2013 Ford F-350 single axle. I took my wife for a ride with out the trailer and she feel the stiffness of the Timbren, but nothing uncomfortable.
Have not towed our fifth wheel with these installed yet which was the main reason for the purchase. Towed a dump trailer and the added stability was definitely noted. With my truck loaded as usual with several hundreds of pounds of gear (two tool boxes, wood dunnage for leveling camper, ladder, B&W Companion fifth wheel hitch/Turnover ball, floor jack, tire inflator, jumper cables, screw gun kit, two traffic cones, brooms, squeegee - you get the idea!) the Timbrens are in contact with the bumper bars on the axle setup. Was hoping that the springs would not be in contact during normal daily driving but the stiffening of the ride is more than tolerable. I did not install the additional spacers as I could tell it would just add more weight to the Timbrens when loaded for daily driving. I'm sure if my truck bed was truly empty I would be off of the Timbrens.
As for the five star rating without using these for the primary purpose I must say that is all on etrailer. They were great to deal with, answered a question I had very well and the shipping was extremely fast.
This system worked very well. The Timbren system brought the truck back to level and also help the sway of the truck. This suspension Enhancement system went on a 2012 Ford F350 after adding a truck camper of 4000lbs.I am glad I went this way instead of air bags.
i have finally hooked up after installing Timbren rear suspension system it ended up being what i was hoping for took the sag out took the sway out of driving when pulling loaded trailers i have been missing my dually this system has sure helped with my 2008 f350 single wheeled pickup a lot cheaper than air bags did not give an excellent review because have not pulled enough to see how the system holds up
We got these Timbrens for our truck that hauls a truck camper. Took the sway out of driving
I placed these on my 2012 F-350 SRW as an alternative to putting air bags on due to the price difference. The timbrens have worked well when pulling but has taken the rough ride of a one ton truck and made it worse under normal driving conditions. These don't allow for much travel of the suspension when going down the road and hitting normal bumps. If you're considering these or airbags spend the extra money on airbags and be done once and for all.
Although these timbrens worked better than the standard suspension I ultimately had to remove them and replace them with airbags which worked substantially better. They were relatively easy to install. I didn't see any issues with the quality of the product I just don't think it was sufficient enough to provide the additional suspension support for my heavy camper. The airbags work much better. My timbrens have spent now most of their time in a box in my garage still in near new condition.
I drive a F350 Super Duty, 2016, Crew cab, short bed. I pull a 38 FT, 16,500 GVWR goose neck 3 horse with living quarters. I was going to put in air bags as I was sick of slamming into my bump stops and my headlights aiming to the sky; oddly the trailer towed great except for those two items. I had thought about the Timbren's but was hesitant. After my trailer guys at Triple C in Watervliet, MI; great guys, told me they had stopped putting in air bags, but now suggested the Timbren enhancement system, I thought I would try it.
GREAT PRODUCT; cheaper than airbags, easier to install, no maintenance and works great. I put them and immediately drove the horses from Chicago to West Palm with no problems. Truck is almost perfectly level now. I did not have one of the shuddering slamming events I typically get 3 of in Indiana alone. I would strongly recommend.
Also; he service was great. The online ordering would have gotten it to me late, but I called and LaceyG was a huge help in getting it with that days shipments. She was also a big help on finalizing my decision.
I have installed and used the Timbrens on my 2015 F350 dually with my 5th wheel Keystone Fusion RV for a year now. i have to say that the Timrens are not only easy to install but make the ride of my truck excellent not only on the highway but back roads as well that includes very twisty turns. Timbrens keep my truck level and i don't have to ever worry about airbag air pressure. i have owned airbags before and never again will i ever buy or use them. When you don't have a load in the bed or your RV hooked up the Timbrens ride above then axles.. Best investment for towing period!
Great product and installs easily. I did not use the spacer, so this allows the stock suspension about 1-1/2" of travel before contacting the Timbren units. I tow a 16K fifth wheel and the Timbren's handle this load very well. You can see the compression marking on the lower side of the Timbren when the trailer is hooked up to the truck. Just enough contact to keep the truck at a level stance. My stock "bump stops" were starting to fall apart from age and wear/tear. These Timbrens now add an extra level of suspension that makes the truck feel much more in control when pulling the fifth wheel.
Hi quality parts but worthless instructions. No sequence of assembly and the orientation of the brackets are totally wrong in the illustration. You should pre assemble the bracket to the rubber bumper then install that in the truck frame.
Az
8/3/2023
Just as well as it did on day one. I am so happy with it that recommended it to my son who wants to install airbags. Now he is thinking about it. He drives a 2016 F250.
just installed, too early to tell!
Installed these Timbrens on my 2016 F350 to enhance the stability of my truck for a slide in truck camper. Have loved the results of them. They have noticeably helped leveling the truck/camper combo, and sway while driving. When the camper is off the truck these are not engaged. Have had no issues and would recommend them.
Jim
4/1/2024
As expected. No issues and still performing perfectly.
I won’t have a truck without this product. We haul a lot of cows and hay with an early 1999 F350. This product makes an instant difference in handling with a heavy load. So much so that I was asked to hold money out of an employee check to order a set for his personal truck. Install was easy. Holding up well after two years of abuse. Could not recommend more.
My 2015 F-350 dually would always squat when I’d hook up my fifth wheel.
Towed it for the first time since purchase and install and the truck is nice and level. The ride is better also and after driving a bit without the camper I don’t really notice them. I love the simplicity of these over airbags and imagine they won’t be needing any maintenance or replacement anytime soon. Great simple solution. Not so easy for an old fat guy to install
laying under the truck in the driveway but I managed!
John R.
10/13/2018
They work. It is nice towing nice and level now. The ride with the load on is good and smooth and very stable. I am still very happy I went them. Put them on and forget about them, no maintenance and no worries.
Installation was a breeze on my 2016 F-350 sbcc 4x4 thanks to the provided videos (didn't even need to jack up the truck). It has performed as advertised towing a 16,000 lb 5th wheel, no squat, rides great on most surfaces and handles curves with little effort. The frosting on the cake is the fact that they require no maintenance! I will never buy another set of air bags again!
Scott S.
6/13/2019
Just came back from a 5,000 mile trip through 6 states towing a 16,000 5th wheel. We encountered everything from dirt roads to major city interstates. The Timbrens performed flawlessly as advertised.
We love them!
I don’t know why people say it changes the ride when not loaded mine does great just touching a little bit when not loaded but also drives the same on my ford dually when it’s loaded with excavator just not much squat!! Life changer for me!
Outstanding support for my F350. Simple to install and all certainly help in towing!
The Timbrens are great. I have not had the truck with a full load yet but I anticipate they will help bring the truck back to level. The install went well but we were not able to use the additional spacer even with the longer bolts. We were not able to put enough pressure on the bolt to get the nut started. I don’t believe I will need the spacers so it should be ok. The directions didn’t include the amount of torque that was needed so I sent e-trailer an email. They checked with Timbren and the torque is 1/4 turn after they are tight. Ive attached some pictures of the completed install.
One year later and I still love them. Fifth wheel towing is so pleasant. Super stable, and no squat. I love that I don’t need to worry about air leaks like I did with the airbags these replaced.
Timothy
8/24/2025
No squat, no sway, no regrets! Love my Timbrens F350 superduty 6.7L diesel 4x4 and Brinkley Z3100 fifth wheel.
I've had the Timbrens installed for about a year now and can report that they have done exactly what I wanted from them. The install was pretty easy (did it in the driveway using my creeper).
My F350 was squatting a bit from the 3000# pin weight and I wanted to reduce that. Unloaded I can't tell they are there unless I hit a pretty big bump and when we're hitched they eliminate most of the squat and the truck is now pretty level when towing. I was thinking about installing air bags but went this route since it was simple and cost less. It's a great product!
I've read some complaints about a rough ride when unloaded and I think that's due to not getting the unloaded gap right during installation.
Submitting an "Installed" pic.
We're still very happy with our purchase. Thanks etrailer!
Very easy to install, so far unloaded ride us great..cant wait to hookup trailer
I installed these on a F350 with a service box. I run pretty heavy with all the tooling in the service box and truck would be on the overloads even before hooking up to a trailer. These took the sag out and helps greatly when I pull trailers. I would say the ride is stiffer beings the truck sits on the new bump stops all the time, but it isn't terrible. I trade a little rougher ride to reduce the sagging.
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Allen
4/1/2024
The extreme timbrens are definitely extreme! We should have purchased the standard timbrens as the extreme one shake our teeth and our truck with the camper on it. They are so stiff that they don’t provide any suspension to the rear axle. It more or less a dead or fixed axle. I’d prefer and recommend the standard timbrens!