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Timbren Suspension Enhancement System - Rear Axle
Timbren

Timbren Suspension Enhancement System - Rear Axle

Part Number: T28MR
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$269.36
Retail:$316.90
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Vehicle Suspension

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8,600-lb Capacity. These hollow rubber springs sit above the rear axle to help stabilize and level your vehicle. Becomes more rigid as more weight is added for great performance when you're hauling a heavy load. Great Prices for the best vehicle suspension from Timbren. Timbren Suspension Enhancement System - Rear Axle part number T28MR can be ordered online at etrailer.com or call 1-800-940-8924 for expert service.
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Timbren Vehicle Suspension - T28MR

  • Bump Stops
  • Towing/Load Leveling
  • Timbren
  • Heavy Duty
  • Rear Axle Suspension Enhancement

8,600-lb Capacity. These hollow rubber springs sit above the rear axle to help stabilize and level your vehicle. Becomes more rigid as more weight is added for great performance when you're hauling a heavy load.


Features:

  • Improves suspension, handling, and safety
  • Becomes more rigid as more weight is added for great performance when you're hauling a heavy load
    • Increases stability
    • Reduces vehicle sag
  • Works independently - side-to-side adjustment
    • Helps compensate for off-center loads
    • Reduces body roll when swerving and turning corners
  • Acts as shock absorber, taking the brunt of bumps and rough roads
    • Extends the life of your vehicle's suspension
  • Includes 2 Aeon hollow rubber springs, custom-fit brackets, and hardware for a simple installation
    • Installs directly onto frame
    • No drilling required


Specs:

  • Load-leveling capacity: 8,600 lbs
    • Timbren springs will not increase your vehicle's weight-carrying capacity. Do not exceed the manufacturer's recommended weight limit.
  • Lifetime warranty
  • Satisfaction guarantee


An example of sag on a vehicle's rear axle under a heavy load

Whether you're hauling heavy loads in your bed or cargo area or you're towing a trailer, you will often see the rear of your vehicle sag while the front end rises. In these cases, the rear axle is handling not only the weight of the cargo, but also more of the vehicle's weight. Because less weight is on the front axle, the front tires are making less contact with the road. Overall handling - traction, steering, and braking - is negatively affected. But the resistance from Timbren's Suspension Enhancement System works with your factory suspension to keep your vehicle level and improve your driving experience.


Diagram of the Timbren spring installed

The Timbren system comes with custom-fit brackets that are bolted onto each frame rail above the rear axle. Hollow rubber springs are bolted to the bottom of the bracket and hang down to where the bottom of the spring sits, 1" above the axle. The inch of clearance allows the existing factory suspension to operate normally under light loads and standard terrain, ensuring the smooth, comfortable ride that you are used to.


Animation of a standard Timbren rubber spring

Timbren Suspension Enhancement Systems are designed to work progressively. When the hollow rubber springs are compressed, the convoluted design causes them to quickly collapse along the folds. Once the folds are compacted, the stacked barrel shape increases resistance, stiffening the suspension and keeping your vehicle level.


Timbren suspension system works to prevent body roll

Each hollow rubber spring works independently to support the driver's side or passenger's side of your vehicle. This is helpful when you swerve or make sharp turns. Each spring is activated when it is needed, so body roll is greatly reduced. The independent action also works well when you are hauling off-center loads.


An example of a trailers swaying

Because the vehicle handles better with the springs, less turbulence will be passed along to the trailer, and this helps to keep the trailer in line. Your driving comfort is further enhanced if the trailer does begin to sway (from a gust of wind or a passing semi), because the movement from the trailer is not transferred to your vehicle. This also works to make the sway subside more quickly.


An empty truck on a bumpy road without Timbren

Another great feature of the rubber construction is that the springs absorb most of the road shock, creating a smoother, more stable ride overall when loaded. Wear and tear on the factory suspension is also lessened because the rubber springs work to prevent bottoming out on rough roads.


Timbren Suspension Enhancement Compared to the Competition

Timbren's Suspension Enhancement Systems are much easier to install than air springs - there are no air hoses to run, no compressors or gauges to hook up, and no manual adjustments to make. The rubber construction makes Timbren's springs more elastic than similar products constructed of microcellular urethane. And more elasticity allows for a more comfortable ride when loaded or towing because the rubber has more travel.



GMRS15 Timbren SES with Aeon Hollow Rubber Springs - Rear Axle

Installation Details T28MR Installation instructions

This Product Fits The Following Vehicles




Customer Satisfaction Score:

Ratings & Reviews

4.7

3647 reviews
5 Stars
(2887)
4 Stars
(482)
3 Stars
(115)
2 Stars
(75)
1 Star
(88)
8,600-lb Capacity. These hollow rubber springs sit above the rear axle to help stabilize and level your vehicle. Becomes more rigid as more weight is added for great performance when you're hauling a heavy load.

by:

We would not be without the product and will go to the site. It is wonderful!



by:

Great product. Huge improvement over stock and easy to install. I have put them on my last several trucks.



by:

bought a couple things from your site and i could not be more pleased--everything about my experience was first class--i will be looking to buy from you in the future



by:

Does the job and easy to install. Does make for a little rougher ride while towing but I’m used to it now



by:

Easy to install and stabilizes ride when hauling heavy loads. Would highly recommend.



by:

Works great. Still looks like new after a year and we use it hard.



by:

Excellent



by:

this fit perfectly on my 2016 nv2500. It really helped with my sag. would not hesitate to buy again.



by:



by:

Working really well, should have bought this first. Very easy to install.



by:

Very easy to install and did everything it said it would do. I'm very pleased with the quality.



by:

Excellent product. 2000 pounds in the box of my F-150, always stable on the
road.



by:

These work like a champ. Ten minute install and removes the rear end squat straight away.



by:

Works great. Truck rides as normal without load. Load it up and they engage and the truck rides level.



by:

Yes I like them they do a great job and was easily installed directions was easy to follow



by:



by:

These have helped with squat and swaying but definitely rough the ride.



by:

This is my second vehicle with the Timbren system. Simple to install and they work Awesome.



by:

Install was a snap. Works as anticipated. Leveled out our 2014 F-250 very well when loaded vs without.



by:

Pricey, but effective. The ride is unaffected when not towing. While towing, there is a bit more bounce on uneven rough pavement. Great on smooth even pavement.



by:

Very easy to install and they worked as indicated keeping the back of the truck level.



by:

Worked great, easy to install and I no longer get ss much bottoming out...



by:

Gave alot better support and ride without having to deal with adding air. Hook and go.



by:



by:

Easy to install. can haul heavier loads without the rear squat. works great.


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3647
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See what our Experts say about this Timbren Vehicle Suspension

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    Hi Brian; the SumoSprings # SS45FR will not fit your 2025 Sierra 1500 with Adaptive Ride Control. The answer from Sam is a little older and probably written before anyone knew about the restriction. I went ahead and corrected it, thank you for pointing this out. However, that doesn't solve the problem of suspension enhancement for your truck. I have two options for you that are compatible with Adaptive Ride Control. The first is the RoadActive Suspension Custom Leaf Spring Enhancement...
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  • Choosing Between Air Bags and Timbren SES for 2022 GMC Sierra 1500
    Hello Bob; between the two options the air bags are definitely the better choice. Not only are they fully adjustable, they can be run at the 5 psi minimum when you aren't towing or hauling. This means they won't have an impact on your unloaded ride quality. The Timbren # T28MR tends to result in a harsh ride when it comes to everyday use. The best and most reliable option for air bags on your 2022 GMC Sierra 1500 is the Firestone # F2609. I also recommend adding an air compressor like...
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  • Could Timbren Kit # T28MR for 2025 GMC Sierra 1500 fit AT4 Model
    Hey Shane, sorry for any confusion but the AT4 models of the 2025 GMC Sierra 1500 have a factory 2 inch lift which is why the Timbren kit part # T28MR would not fit. What you could do is order the kit and install it and then let me know how much of a gap is created between the bottom of the Timbren and where it contacts axle. With that info I could let you know how big of a spacer you would need to take up the additional space created by the lift kit.
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  • What Timbren Rear Suspension Springs Fit a 2024 GMC Sierra 1500?
    The Timbren Suspension Enhancement System # T28MR is the kit which will fit your 2024 GMC Sierra 1500. Do understand this is a very heavy duty spring with a weight capacity of 8,600lbs. This will most likely give you a less than desirable ride quality. Instead I recommend checking out the SumoSprings in a 1,000LB # SS65FR or 1,500LB # SS45FR capacity. These are much more inline with the weight capacities of your Sierra. And as these are a progressive material it will not be as harsh of...
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  • Comparing SumoSprings and Timbren Springs For a 2023 GMC Sierra 1500
    Personally I feel the SumoSprings Solo Custom Helper Springs # SS45FR are a better option for your 2023 GMC Sierra 1500. These are not as stiff as the Timbren Springs # T28MR and will not cause such a harsh ride when not hauling additional weight or under light loads. These particular SumoSprings are rated for 1,500lbs which is more in line with the payload capacity for your Sierra. The Timbrens are rated for 8,600lbs which is far more than your truck would ever be able to carry.
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    The rear Timbren kit you'd want for your 2024 GMC Sierra 1500 is the part # T28MR which is the standard duty version. This will give you a better blend of support and ride quality than the severe duty version part # T53MR which would be a lot harsher.
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  • Timbren or Roadactive Kit for 2019 Chevy Silverado 1500 with Sag when Towing
    Both the Timbren and he Roadactive part # RAS54FR would work for getting rid of the sag you mentioned but the RAS kit is for sure the winner. The Timbrens get the job done but they are notoriously harsh when loaded and unloaded whereas the RAS kits actually improve loaded and unloaded ride quality and improve handling. They are also adjustable too unlike the Timbrens.
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  • Correct Timbren Suspension Enhancement For 2021 GMC Sierra 1500 AT4
    I reached out directly to Timbren for you, and they told me the correct fit for your 2021 GMC Sierra 1500 AT4 was indeed the Timbren Suspension Enhancement System # T28MR.
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  • Are Spacers Needed to Install Timbrens on 2024 Chevy Silverado 1500
    Additional spacers are not needed for your 2024 Chevy Silverado 1500, but you will use the spacers that come with the Timbrens that fit your truck, the Timbren Suspension Enhancement System # T28MR. The spacers are common on Timbrens and won't affect the performance in any way, they're just to ensure a good fit.
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    The Timbren Suspension Enhancement item # T28MR and the RoadActive Suspension item # RAS54FR can both be used in tandem on your 2021 Silverado 1500 but I wouldn't recommend it. The Timbrens are great to reduce sag but they only engage when your suspension is weighed down so there will still be some sag no matter what. Timbren's are also bouncy and will negatively affect the comfort of your truck's suspension when you are not towing. I recommend only using the RoadActive Suspension item...
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  • Comparing Timbren Suspension Enhancement For a 2023 GMC Sierra 1500
    The Timbren Suspension Enhancement System # T28MR is designed for your 2023 GMC Sierra 1500 both for heavy loads and unloaded. Do note that unloaded ride quality will be more stiff. The Timbren System # T53MR is their severe service kit. This is designed for vehicles that will always be carrying heavy loads. If you are adding a service bed, slide in camper or salt spreader this is the better option. Without a heavy load on the suspension you will notice a much stiffer ride for the rear...
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  • Are Spacers Needed for Timbrens on 2021 Chevrolet Silverado 1500 Z71 Trail Boss
    Yes, the Timbren Suspension Enhancement System # T28MR will be the best option when it comes to cost-effectiveness. This will fit with your 2021 Chevrolet Silverado 1500 Z71 Trail Boss but you'll want to make sure these fit the gap properly. The Timbrens measure 5-5/8" high overall and you need a gap of 1/2" to 1-1/2" for the Timbrens to be effective. If you find that you have more than 1-1/2" of a gap then you can use the 1/2" Spacer # TA25722-90P00 and the 1" Spacer # A25723-90AH00 as...
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  • Comparing SumoSprings and Timbrens for a 2021 GMC Sierra 1500 AT4
    The Timbren Suspension Enhancement System part # T28MR and SumoSprings Solo Custom Helper Springs part # SS45FR are both great options for a 2021 GMC Sierra 1500 AT4. I recommend the SumoSprings as they don't typically ride as rough as the Timbrens but the Timbrens also offer more support. They are both however bolt-on, no maintenance options. Please note, a leveling kit won't warranty any additional spacers to be added to the rear suspension enhancements. These kits are also not compatible...
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  • Recommended Suspension Upgrade for a 2023 GMC Sierra 1500
    Congrats on the new truck! The Timbren item # T28MR will work and it'll keep the rear end of your 2023 GMC Sierra 1500 from squatting but they're also going to give you a rough ride when you are not towing or have your camper. They're just a solid piece of rubber and they don't have much give to them. I recommend using the SumoSprings Solo Custom Helper Springs item # SS45FR instead. These have a 1,500 lbs capacity and only engage when there is weight added to your truck. When you are...
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  • Recommended Suspension Enhancement System For A 2019 GMC Sierra 1500
    When installing a Suspension Enhancement System on your 2019 GMC Sierra 1500 The Timbren Suspension Enhancement System - Rear Axle # T28MR are confirmed to fit. The system has a 8,600 pound capacity that reduces vehicle sag, and increases stability. Using these springs will not increase your vehicle's weight-carrying capacity.
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  • Recommended Suspension Enhancement for 2021 GMC Denali 1500 With Adaptive Ride Control
    For suspension enhancement that is compatible with the Adaptive Ride Control on your 2021 GMC Sierra Denali 1500 I recommend the Firestone Ride-Rite Air Helper Springs - Double Convoluted - Rear Axle # F2609. These air bags will keep you level while towing and improve steering and stability. These have a load leveling capacity of 5,000 lbs and feature a simple, no-drill installation. I also highly recommend adding an air compressor like the Firestone Air Command II # F2178. This will allow...
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  • Will Timbrens for a 2021 GMC Sierra 1500 Work with Elevation Package
    Yes, the Timbren Suspension Enhancement System part # T28MR which is a fit for a 2021 GMC Sierra 1500 will work on models with the elevation package. I checked with Timbren to confirm this for you as well. The only models which are lifted from the factory and would create issues for the suspension enhancements are AT4.
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  • Recommended Suspension Enhancement for a 2022 GMC Sierra Denali 1500 w/ Adaptive Ride Control
    I have an option for you but the Adaptive Ride Control on your 2022 GMC Sierra Denali 1500 severely limits your choices. I recommend the Timbren Suspension Enhancement System item # T28MR. I confirmed with Timbren that these do fit your Sierra. This are typically only used for service vehicles or trucks that routinely haul heavy loads. If you are not towing regularly you should look into a weight distribution system. They will do a great job of providing support for towing or hauling...
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  • Is the Timbren Suspension Enhancement System Compatible With Max Tow Package on 2020 Silverado 1500
    Yes, the Timbren Suspension Enhancement System # T28MR is compatible with the max tow package on your 2020 Chevrolet Silverado 1500. This fits 2 wheel and 4 wheel drive models and is also compatible with an in-bed hitch. These have a load leveling capacity of 8,600 lbs and come with a lifetime warranty.
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  • Will The Timbren Suspension Enhancement Fit a 2024 Chevrolet Silverado 1500 ZR2?
    While I can confirm the Timbren Rear Suspension Enhancement # T28MR will fit your 2024 Chevy Silverado 1500 ZR2, I would be hesitant to put such a heavy spring on your truck. I would personally select the SumoSprings # SS65FR as these will actually help to absorb road shock where the heavy Timbren's would transfer it to the truck. I only like using Timbren springs on very heavy duty applications such as trucks with a plow or work box in place of the bed.
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  • How to Fix a Rough Ride with the Timbren Suspension Enhancement System on 2019 Chevy Silverado 1500
    It's pretty normal to experience a rough ride with the Timbren Suspension Enhancement System part # T28MR on a 2019 Chevrolet Silverado 1500 while going over bumps unloaded. There isn't much that can be done to stop that with these springs but we do have a similar style which are much more forgiving when going over bumps in the road while unloaded, the SumoSprings Solo Custom Helper Springs part # SS45FR. The Sumo's are progressive unlike the Timbren's which means the first few inches of...
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  • How Does Factory Jounce Bumper of 2021 Chevy Silverado 1500 Remove for Install of Timbren
    There is a bolt head in the center of the factory jounce bumper of your 2021 Chevy Silverado 1500 that you will need to remove to remove the factory jounce bumper. You can see this in the attached install video for the Timbren kit part # T28MR.
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  • Recommended Air springs for a 2025 Chevrolet Silverado 1500 W/ Adaptive Ride Control
    Kurt, it looks like the reason the AirLift Air Springs won't work with the adaptive ride control because of the way the springs install in the suspension, but the good news is that there is an alternative; the Firestone Ride-Rite Air Helper Springs # F2609, which will work. These springs have a load leveling capacity of 5,000 lbs, an adjustable air pressure range of 5-100 PSI, and has a simple no drill install.
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Used Picture for Timbren Suspension Enhancement System - Rear Axle
Used Picture for Timbren Suspension Enhancement System - Rear Axle
Used Picture for Timbren Suspension Enhancement System - Rear Axle
Used Picture for Timbren Suspension Enhancement System - Rear Axle

Condition: Installed

Notes: There are install marks from previously being test fitted.

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Info for this part was:

Employee Jeff D
Installed by:
Jeff D
Employee Jameson C
Expert Research:
Jameson C
Employee Joshua S
Video Edited:
Joshua S
Employee Jacob T
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Jacob T
Employee Dustin K
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Dustin K
Employee Chris R
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