bing tracking image
  1. Vehicle Suspension
  2. Timbren
  3. Jounce-Style Springs
  4. Rear Axle Suspension Enhancement
  5. Extra Heavy Duty
Timbren Rear Suspension Enhancement System

Timbren Rear Suspension Enhancement System

Our Price: $252.45
You Save: $44.55
Vehicle Suspension

Will this fit?

To see if this custom-fit item will work for you please tell us what vehicle you'll use it with.

This item qualifies for Free Shipping
Shipping Weight: 9 lbs
In Stock
zoom in icon
slider vertical icon
zoom out icon
Comment field cannot be left empty.
Name field cannot be left empty.

Thank you! Your comment has been submitted successfully. You should be able to view your question/comment here within a few days.

Error submitting comment. Please try again momentarily.

Product Images

In Use/Installed

Customer Photos

Need help with installation?
Locate installers near me
6,000-lb Capacity. These hollow rubber springs sit above the rear axle to help stabilize and level your vehicle. They also provide a more comfortable ride by absorbing road shock and improving roll stability. Easy to install and use. Great Prices for the best vehicle suspension from Timbren. Timbren Rear Suspension Enhancement System part number TGMRCK25S can be ordered online at or call 1-636-306-4830 for expert service.
  • All Info
  • Reviews (4683)
  • Q & A (0)
  • Photos
  • Why etrailer?

Timbren Vehicle Suspension

  • Jounce-Style Springs
  • Rear Axle Suspension Enhancement
  • Timbren
  • Extra Heavy Duty

6,000-lb Capacity. These hollow rubber springs sit above the rear axle to help stabilize and level your vehicle. They also provide a more comfortable ride by absorbing road shock and improving roll stability. Easy to install and use.


  • Improves suspension, handling and safety
  • Provides additional support as needed so you always have a smooth, comfortable ride
    • Allows the leaf spring ample movement while cushioning light loads
    • Becomes more rigid as more weight is added
      • Increases stability - providing great performance while hauling heavy loads
      • Reduces vehicle sag
  • Works independently - side-to-side
    • Helps compensate for off-center loads
    • Reduces body roll when swerving and turning corners
  • Acts as shock absorbers, taking the brunt of bumps and rough roads
    • Extends the life of your vehicle's suspension


  • Includes 2 Aeon hollow rubber springs, vehicle-specific brackets and hardware for simple installation
    • Replaces axle bump stops on frame
    • No drilling required
  • Capacity: 6,000 lbs
    • Do not exceed the vehicle's weight-carrying capacity
  • Designed to work with a suspension system that is in good working order
  • Bump stop height: 5-1/8"
  • Spacer height: 7/8"
  • Limited lifetime warranty - satisfaction guarantee

Reduced rear axle sag with Timbren suspension enhancement

Whether you're hauling heavy loads in your bed or cargo area or 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 your rear axle. Hollow rubber springs are bolted to the bottom of the bracket and hang down to where the bottom of the leaf 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.

Action 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.

Trailer swaying as it is towed behind a truck

Because your 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 SES

Another great feature of the rubber construction is that the springs absorb most of the road shock, creating a smoother, more stable ride overall. 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 because the rubber has more travel.

GMRCK25S - Rear Suspension Enhancement System with Aeon Hollow Rubber Springs by Timbren

Item # TGMRCK25S

Installation Details TGMRCK25S Installation instructions

This Product Fits The Following Vehicles

Customer Satisfaction Score:

Customer Reviews

Timbren Rear Suspension Enhancement System - TGMRCK25S

Average Customer Rating:  4.7 out of 5 stars   (4683 Customer Reviews)

6,000-lb Capacity. These hollow rubber springs sit above the rear axle to help stabilize and level your vehicle. They also provide a more comfortable ride by absorbing road shock and improving roll stability. Easy to install and use.


These were exactly what I needed they only get used when you have a heavy load so there is no change to the ride quality, very heavy duty and well made. I also purchased front ones for my truck because I use it for plowing and made the truck so much better when having the plow attached, I highly recommend, also there were both pretty easy to install.

After one year still exactly what I needed, I had to completely redo the frame on my 2001 Silverado and the bump stops are still in perfect condition I will be reinstalling them as soon as done with the frame, and I still would highly recommend these
Steven G - 11/26/2022


Not as good as Sumosprings. The Tibrens on the rear of my truck are way too stiff, and don't have a gradual compression. It's like riding a rigid frame

Since the springs are not an adjustable spring, some people feel that it does create a stiffer ride when not towing with a load on the truck. For a 2004 Chevy Silverado there is several alternate air bags available. I recommend taking a look at part # F2250
Firestone Ride-Rite Air Helper Springs - Double Convoluted - Rear Axle
from Firestone. It works with 2 or 4 WD and with in bed hitches.
-- Etrailer Expert Jenny N - 06/06/2022


The springs have eliminated the squat and have softened the suspension while towing. While unhitched, the rebound is very limited and a bit tough going over bumps or pot holes. I have to admit I installed the additional “hockey pucks” that came with the kit. If I remove them and just install the springs, the rebound would be increased and soften the ride. My tow vehicle is a GMC 1500HD. The installation was very simple. I am very satisfied with this product. If you are finicky with ride quality and do not mind spending more money, try the airbag kit.


I had air bags and like these alit better. Truck handles better with these


Got them got them installed but haven't had a chance to hook upy 5th wheel trailer and check them out .

2009 Chevrolet Silverado

I put these on my 2500 HD Silverado with a Bull Dog ATV carrier and towed a 6000 lb. camper into the mountains this weekend. With the Timbrens and an equalizer hitch, I never felt a better ride on the highway towing before. These are much better than the air bags and no maintenance. My atv rack ways 300 lbs in the bed of the truck and the ride empty was not rough at all.

2004 Chevrolet Silverado

Great product, SO easy to install if there was a hard part i guess it would be getting the old bump stops off. I have an 04 Silverado 2500HD we have a 94 Elkhorn truck camper. These new Timbren springs took all the rock out of the ride. With out the springs suspension sagged 3 inches with the springs it only sags 1.5 inches witch is the gap to the axel from the spring. I used the spacer that was included. Product comes with all new hardware. I can get over how easy the installation was. Stock ride of truck remained the same after installation too.


They work great. My truck barely dips when I load the travel trailer


Not Made in China! but from our neighbors up North. Good quality and easy installation on a 2008 Chevrolet Silverado HD Duramax 4X4. Installed the kit with the additional round block that is barely resting on the rear axle. I purchased the kit to avoid heavy trailer tongue weight that was causing an uneven vehicle stance. Haven't had a chance to road test yet. I hope is doesn't affect the factory ride.

If you do test it without a full load and the ride is too rough, you can remove the spacer.
-- Etrailer Expert Sierra K - 10/07/2021


The installation was on a 2009 Silverado 2500 HD 4X4 and the product fit perfectly! Installing them was a snap! They really made a difference when towing my 5th wheel RV.

2002 GMC Sierra

Perfect fit and works as advertised. The Timbren were very easy to install. Thanks for the advice etrailer!

Both pictures are right after installation with a completely unloaded bed. Since installation, I have not had weight in the bed, so I can not 100 percent say if the top brackets would touch the U bolts orleaf springs. But from looking at it just now, it appears the top bracket would just barely touch the U bolts with a loaded bed, and would definitely touch if there was side to side movement with a loaded bed like going over a speed bump, pot holes, or uneven terrain.
-- comment by: Jimmy - 01/05/2022


Too stiff with an empty load.


Fast delivery but missing hardware as advertised and pictured!

I will have our Customer Service team reach out to you.
-- Etrailer Expert Jenny N - 03/21/2022


Best investment for my suspension. I have had them for over a year and haven’t broken any springs these were my third set of springs. I can fit 7-1/2 yards of wood chips on a full load averaging 6200 lbs. and tow a 6800 lbs chipper!!!

Nissan Leaf

I carry a few more tools in the back of my truck than the average person does. My main leaf springs, just touch the overload springs in my day-to-day activity. I wanted to lift the truck up just enough to reposition my springs into the unloaded position.

Then when I hooked up our 9,000 lbs. travel trailer the springs would be in a better position to handle the additional load. The Timbren enhancement system worked just the way I had hoped. I would recommend these to anyone who might want to do the same thing that I did.

After one year of pulling our TT the Timbren springs are working just like the day they were installed. I cant see any compression of the springs after 15,000 miles of towing. I would recommend these springs to my friends.
Joe - 05/18/2017


Removed my old air bags after fighting leaks for 6 months. Installed the solid rubber TGMRCK25S. Truck rides a little stiffer,but the body roll has been almost eliminated. Lot more stable in turns. My truck is a bit overloaded with my camper but is level and not mushy as before. Great product.

Ive had the TGMRCK25S instled for over a year now and couldnt be happier. I have a 2007 GMC 2500HD with a Artic Fox 990 cab over camper. The body roll is minimal and overall stability ks greatly improved. Great product.
Buz E - 07/17/2020

2016 Chevrolet Silverado 2500

I installed a set of these on my 2016 R 2500 to control body roll when hauling my slidein camper. It completly eliminated the body roll when loaded and improved ride when empty. It is very easy to install and works better than described. Both sets arrived within 2 days of order. Another benefit over airbag system is if your truck is on rack for repair the timbren will not be damaged when truck is raised on lift.

I am completly satisfied with the timbren suspension aid. It stopped the body roll on my truck wirh my slidein camper on. Thanks for selling a quality product.
Don - 12/28/2018


Didn't have all the hardware, I have to go buy all the nuts.(Didn't want to just say I have no nuts). But the product looks great and was a very easy install.

This kit is supposed to come with 4 nuts. I will have customer service reach out to you.
-- Etrailer Expert Sierra K - 10/21/2021

Chevrolet Silverado 2500

The Timbrens gave me about 1/2" lift assistance with a 2200# load in my Chevy 2500 pickup. I recently changed to a 5th wheel with 2500# hitch weight. I was very pleased that the Timbrens where sufficient to keep the truck level and I did not need to install air bags. This is my second set of Timbrens. The first I bought at a local shop and had them install them. I bought the latest set from etrailer, and they were very easy to install, and I saved about 30%.

2003 Chevrolet Silverado 2500

I installed this on my 03 GMC 2500 Duramax ex cab Long bed. The reason for the installation was, when pulling my 35 foot Hitchhiker 5th at night my headlights
at low beam were too high and causing problems for oncoming traffic,. This was
caused by deflection in the rear springs. The installation corrected the problem.
I carry tools and other equipment in a 29x56 inch in bed tool box that is mounted
in the front of the bed, the box loaded weight I would estimate 135lbs. There is
also a 20k Reese hitch which is mounted in the bed and I would estimate the weight with the mounting rails as around 100lbs, with there combined weight
empty ride is like axle is a solid hookup to the frame via the rubber bumpers.


The product serves it's purpose by transferring the load directly to the axle. Thereby bypassing your suspension system. As expected, this removes sway and stabilizes the towing experience. While that is ok, this also transfers vibrations and bumps encountered from road conditions, that are normally mitigated by shock absorbers, directly into the ride experience. But due to the tough rubber composition, this is minimized. Be aware, however, that loads directly transmitted to the rear tires without shock reduction can increase the stress on them resulting in a higher potential for damage if they are older. Might accompany this product with fresh tires.

2003 Volkswagen CC

I have a 2003 GMC 2500HD Duramax 4x4 CC. I put on super springs when the truck was new. I pull a Alpenlite 5 wheel, with a pin weight over 2300 lbs
I wanted to change from super springs to timbrens to loose weight and retain support for suspension.
I installed timbrens without the spacer and they rested on the axle pad. The ride wasn’t awful but more harsh then with the super springs. I reinstalled the super springs and this gave me an
1 1/4” space from timbrens and axle. I haven’t pulled the 5 th wheel yet. I think with both on should help with sag.

2005 Chevrolet Silverado

I love, Love, LOVE these things. The ride quality when towing our 9000# RV is like night and day. Dramatic improvement due them being in contact with the axle. I highly recommend purchasing these if you have issues when towing. Installation was a breeze. No issues at all.


I have used the Timbren units on my current truck as well as two others in the past, including on the front of a snow plow, and I am very happy with them. I like their simplicity, performance, and ease of installation.


I recommend it for your truck!! I bought it for my 1/2 ton 2006 silverado 1 year ago. Even tho he had 3 leaf spring and a helper in each side.. when a was towing my 2 axles enclosed trailer it made a significant difference.

I have a 3/4 ton now. With 5 leaf spring and a helper. I haven't bought some for this one, but i will be looking into it depending on my need's in the future...

Show More Reviews

See what our Experts say about this Timbren Vehicle Suspension

< Previous
123. . .4

Do you have a question about this Vehicle Suspension?

  • Why

    At we guarantee:
  • Real product know-how.

    We make sure that the products we sell are what we say they are, and that they work the way they are supposed to work. Get real advice from a real person who has the knowledge and expertise needed to solve your problem.
  • Most detailed, accurate vehicle suspension information available.

    Because we take providing accurate product information seriously, we take our own detailed product photos, demo videos and installation videos, as well as verify measurements, instructions, and vehicle fit information.
  • Installations, made easy.

    We love helping people and have the most highly-trained customer service, hands-on experience, step by step videos and installation instructions.
  • Fast shipping.

    Your order is automatically routed to get out of our warehouse and to your door as quickly as possible. Receive free shipping on orders over $99.
  • Personalized service for life.

    We provide one-on-one, personalized service from the ordering process through the life of your product.
  • Trusted since 1946.

    We've been serving customers since our parts store first opened in 1946 and continue to be recognized by our customers, our vendors and third parties for exceptional service.
  • Returns Policy

    Need to return an item? No problem. Please read our Returns Policy for more information.

Info for this part was:

Employee Mike L
Expert Research:
Mike L
Employee Robert G
Expert Research:
Robert G
Employee Michael H
Expert Research:
Michael H
Employee Jeff D
Expert Research:
Jeff D
Employee Jameson C
Expert Research:
Jameson C
Employee John H
Expert Research:
John H
Employee Adam R
Expert Research:
Adam R
Employee Lori W
Expert Research:
Lori W
Employee Rachael H
Expert Research:
Rachael H
Employee Jeffrey L
Expert Research:
Jeffrey L
Employee Joshua S
Video by:
Joshua S
Employee Kathleen M
Video by:
Kathleen M
Employee Jonathan Y
Video by:
Jonathan Y
Employee Nicholas E
Test Fit:
Nicholas E
Employee Robert C
Test Fit:
Robert C
Employee Jacob T
Video Edited:
Jacob T
Employee Sue W
Video Edited:
Sue W
Employee Chris R
Video Edited:
Chris R
Employee Cole B
Installed by:
Cole B
Employee Mary E
Updated by:
Mary E
Employee Wilson B
Updated by:
Wilson B
Employee Noah M
Updated by:
Noah M
Employee Carrie F
Updated by:
Carrie F

At we provide the best information available about the products we sell. We take the quality of our information seriously so that you can get the right part the first time. Let us know if anything is missing or if you have any questions.

Product Experts Available Now!
Call 1-636-306-4830