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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

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.

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.

Jim
4/1/2024
As expected. No issues and still performing perfectly.

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.

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!
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Timothy
8/24/2025
No squat, no sway, no regrets! Love my Timbrens F350 superduty 6.7L diesel 4x4 and Brinkley Z3100 fifth wheel.