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  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

Retail:$297.00
Our Price: $252.45
You Save: $44.55
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. 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 TGMRCK25D can be ordered online at etrailer.com or call 1-800-940-8924 for expert service.
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  • Why etrailer?

Timbren Vehicle Suspension

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

8,600-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.


Features:

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


Specs:

  • Includes 2 Aeon hollow rubber springs, vehicle-specific brackets and hardware for simple installation
    • Replaces axle bump stops on frame
    • No drilling required
  • Capacity: 8,600 lbs
    • Do not exceed your vehicle's weight-carrying capacity
  • Designed to work with a suspension system that is in good working order
  • Limited lifetime warranty - satisfaction guaranteed


An example of sag on a truck's rear axle under a heavy load. The Timbren Suspension Enhancement System levels the vehicle.

Whether you're hauling heavy loads in the cargo area or by pulling a trailer, you will often see the rear sag while the front end rises. In these cases, the rear axle is handling not only the weight of the cargo, but more of the truck's weight, as well. 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 has a custom-fit bracket that will be 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, one inch 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 the truck level.


Timbren suspension system works to prevent body roll

Each hollow rubber spring works independently to support the driver's 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 the truck. 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. Wear and tear on the factory suspension is also lessened because the rubber springs work to prevent bottoming out on rough roads.


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.



GMRCK25D - Rear Suspension Enhancement System with Aeon Hollow Rubber Springs by Timbren

Item # TGMRCK25D

Installation Details TGMRCK25D Installation instructions

This Product Fits The Following Vehicles




Customer Satisfaction Score:


Customer Reviews

Timbren Rear Suspension Enhancement System - TGMRCK25D

Average Customer Rating:  4.7 out of 5 stars   (4812 Customer Reviews)

8,600-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.

by:
2011 Chevrolet Silverado

About a 1/2 inch difference in gap at the bump stop perch but still within parameters. Truck sits perfect with trailer attached. Haven’t towed yet. After towing if they perform like they should will upgrade to a 5 star. Easy to install, definitely needed 2x4 and jack. 2011 Silverado ext cab with 30 ft Genisis 5th wheel.




by:

Makes my truck feel better while towing a 5th wheel camper, especially over expansion joints of the expressway.




by:
2015 GMC Sierra 2500

I haven’t hooked up to the fifth wheel yet or else it might be a 5 star. Based on the 15 minute installation time and the price compared to air bags this appears to be a logical way to go. I will update this as I hook up and put a load on it.




by:

I will say they are perfect for towing but when your not towing cause they are so close to the bottom it feels stiffer when not towing! They should make long enough so that it touches besides that these are perfect




by:

We prefer it over airbags. No hassle adding air etc. Great under our 3/4 ton pickup with our Artic Fox camper!


Comments
Wonderful product!
Jerry - 11/28/2022


by:

Couldn’t be happier with way they operate. I haul a 12,000lb 5th wheel trailer and helps tremendously with the handling and keeps my vehicle from sagging in the rear. Great idea and very reasonably priced.


Comments
Excellent, use them on a regular basis and still holding up great. They’ve been a great addition and also had a couple relatives add them to their vehicles.
Mike M - 08/27/2022


by:

After a year on the road, and a few thousand miles of towing our 5th wheel, the Timbren bump-stops work great. Had air bags that required tinkering and always needed to adjust the pressures. No adjustments needed with Timbren.
Pros: Easy to install, no adjustments, adds stability while towing heavy loads.

Cons: Unloaded, makes driving over seriously large bumps a bit rough with only about an inch or so of factory suspension travel.




by:

I’d seen similar products rated in the 4,000 lb ratings but I went with these. I’m not a mechanic but I removed the factory bump stops and installed both these in 30 minutes or less. I used my rolling jack and lifted from the drop hitch and easily removed the old ones and soapy water and 1/4 twist and these were on. Placed a block of wood in the space between these coils and lowered the jacks then pressed it with my tractor to confirm full engagement. I carry a lot of tools on a 2020 Chevy 2500 I do feel a bit of butt bounce on large bumps but other than that I’m very pleased.




by:
Jeep

I had bought these timbrens and the weight safe hitch with the 8” drop from etrailer. I was quite please by both products. Installation of the timbrens was very easy, only took 30-40 minutes to change out bump stops in my garage.I hauled a Uhaul trailer with a Jeep over 300 miles, with no issues. The timbrens worked great, no issues with the rife. And I really like the weight safe hitch. I recommend checking out these two products from etrailer. Thanks etrailer.


Comments
Great no issues, made a couple trips out to California pulling heavy trailers, the hitch and timbrens are working out great.
David G - 05/17/2020


by:

What I think is that it seems like most of the installers and reviewers of this item aren't using the sense God gave a gnat. This has to be the easiest install ever. It took me 15 minutes to do the entire job including removing the old stops and installing these Timbrens. Had a friend use a floor jack under my hitch, raised it up, i pried out the old stops and inserted the new ones, let it down on a piece of 2x4 and DONE! No removing tires, no removing heat shield, no nothing. 2 screwdrivers and a piece of wood.




by:

Received my springs today and had them installed in less then 45 minutes in my driveway, on my 2018 GMC Denali 3500 HD. I followed the advice of etrailer's videos. I pull a 2011 all aluminum self contained toy hauler and use Husky weight distribution hitch. I have not yet taken our trip to AZ from WI yet but will provide further input when we do over the 4th of July. I used a floor jack on the frame rails to provide clearance for installation and did not take the rear wheels off...worked in the wheel wells to remove and install.




by:

Product does not help rear swag with fifth wheel camper but a half inch. On brand new truck as well. Not happy with product. Called to return them and want me to pay 27.00 shipping and stated in email that was sent to me I couldn’t return if installed. I’m not understanding this ? Do not buy ! I won’t be doing any more business with etrailer . Not helpful at all


Comments
I will have our Customer Service team reach out to you. For Timbren products there is a 60 day money guarantee and they can be returned after installation. There is a shipping cost back that you would be responsible for.
-- Etrailer Expert Jenny N - 03/31/2022


by:
2015 Chevrolet Silverado 2500

Awesome customer service and follow up. Easy installation. Pry bar, couple of 2x4 wood blocks, floor jack and a little WD40. Weight of the truck seats the new bumpers in and you're good to go. Literally took me 20 minutes to remove and install. Can't wait to tow our 5th wheel.


Comments
Excellent!!! Takes the long extended bounce out of bumps/dips in the road. Helps keep the truck from sagging with a big payload as well.
Ty - 06/17/2019


by:
2016 Ram 2500

Absolutely the best load supporting product on the market! Even without a load in my 2016 chevrolet 2500 4x4 the road control and handling is far greater than stock. Ive recommended this product to several friends and complete strangers. Everyone i know that has purchased this for their vehicle feel the same as i. thanks!




by:
2022 Chevrolet 3500

Easy install. Very stable ride for my one ton Chevy. I feel safer now hauling the 44’ fifth wheel. Excellent product.




by:

These have been a great add to my truck for towing. I have a travel trailer and own a business where I use my truck for pulling. The bumps in the road feel much better with these on the rear axel. When compared to stock you will be shocked. Very easy to install and worth every penny.




by: 01/31/2021
2018 GMC Sierra 3500

My order for timbrens was received very quickly.Installation took 45 minutes.It took longer to get my spare tire out of the way.Install was much easier than air bags for sure.I replaced my ride Rite air bags with the Timbrens.Air Bags always loosing 3 to 4 lbs air a week.I had no onboard compressor.Timbrens were better for me.




by:
2011 GMC Sierra

Installed easily with a few blocks of wood and a pry bar.
I'm pleased with the results of the test run with cargo trailer. Next will be the 5th wheel.




by:
2014 GMC Sierra 2500

This is the second set of Timbrens that I have purchased from etrailer and as always they work perfectly with my trailer and Bulldog ATV rack. The shipping is fast, prices are very good, and customer service is great.




by:
2018 Chevrolet Silverado 3500

This rating of 4 stars is because I have not put a load on my truck to test the drive loaded. I have driven it unloaded. The unloaded ride is the same as original. Installation was easy, I looked at the etailer video perfect procedure. It took 30 minutes tops. Fit perfect, easy installation, speedy delivery.


Comments
I did 8,400 miles summer with a 3900 lbs dry weight truck/camper on the truck. The Springs preformed as good as I hoped they would. I definitely would recommend them for this application.
Richard - 10/25/2018


by:
Chevrolet Silverado

I have a 3500HD Silverado and pull a GD Solitude 5th wheel about 17k lbs. The installation was easy for this 65 year old and went well. Truck front and back fender wells measure 40in. from top of well to ground with 5th wheel connected. Rear fender well was 42in. unloaded. During our first trip after installation the ride feels smoother when on roller coaster highway.

The installation video's on this site and other YouTube channels were very helpful for the installation. Definitely glad I did the install myself.




by:
Ram 2500

The set of timbres has worked out great for the rear of my chevy 2500,getting the extra weight off my springs and onto the axle.




by:
2016 Chevrolet Silverado 3500

Easy install....took about 45 minutes including the time to find what I needed to install, and put the tools away....will be putting the trailer on soon can't wait to try these out...


Comments
They work great. The nice thing is you dont have to worry about air leaking out or adding air to adjust your ride. I am very satisfied with your product
Samuel - 08/18/2022


by:

Went on fairly easy, jacked the rear of truck up pulled out old bump stops,soapy water on new ones positioned them and with the help of two short pieces of 2×4s under each side lowered the truck, they slid right in place. Very easy. Won't be hooking up to 5th wheel for a couple of months, looking forward on how they work on truck squat. Might follow up then and give another star.




by:

Timbrens we’re not delivered only Weath ertech


Comments
I see that the package for the Timbren system was delivered on August 3rd. I was wondering if you had any feedback about the product for other shoppers? We look forward to hearing from you.
-- Etrailer Expert Jenny N - 08/09/2022

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3812
Show More Reviews

See what our Experts say about this Timbren Vehicle Suspension

  • What Holds the Rubber Springs in Place on the Timbren Kit # TGMRCK25D on a 2012 Chevy Duramax
    The Timbren Rear Suspension Enhancement system that you referenced # TGMRCK25D, is intended to replace the factory installed bump stops on your truck. These Timbrens are confirmed as a fit for a 2012 Chevy Silverado Pickup 2500 or 3500 and fit both the 2 wheel drive and the 4 wheel drive versions of this truck. This style of Timbrens will install directly in the current bump stop cup and is held in by compression. There is no hardware that is needed to install these Timbrens on your...
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  • Suspension Enhancement or Weight Distribution for Sag on a 2012 GMC Sierra
    If it is sagging now without a load in the bed or towing the trailer then there is something else wrong that will need to be checked out by a GM dealer or trusted mechanic. Suspension enhancement like air bags or Timbren springs # TGMRCK25D, are meant to be used on a stock suspension that is in good working order. After the stock suspension is given the OK then you could install suspension enhancement. If the sag happens when you have the trailer connected then the best solution is weight...
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  • What is the Height and Diameter of Timbren Helper Springs for a 2015 Chevy Silverado 2500
    I went out to the warehouse and pulled Timbren springs # TGMRCK25D for the 2015 Chevy Silverado. The overall height of the springs is 6-1/4 inches. Part of the tops of the springs will be recessed in the factory bump stop mount so as little as 5-1/4 inches of the spring would be sticking out. The diameter is just a hair less than 4-1/4 inches.
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  • Timbren Rear Suspension Enhancement System # TGMRCK25D Recommendation for a 2011 Chevy 2500 HD 4WD
    While this Timbren Rear Suspension Enhancement System, part # TGMRCK25D, is not an air lift system it is comparable to one. This system uses rubber springs instead of air bags that will sit above the axle, helping to stabilize and level the vehicle when towing your Companion 5th wheel trailer. The functions and benefits of this product are similar to an air bag/lift system but also has many advantages over one. This system is much easier to install than air springs - there are no hoses...
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  • Removing Factory Suspension Bump Stops on 2011 Chevy Silverado to Install Timbren Rubber Springs
    The bump stops are compression fit into the cups on the truck frame, therefore they aren't designed to come out easily. I have spoken with one of my contacts at Timbren, who tells me that the bump stop can be removed with a pair of channel lock-type pliers. Grasp the bump stop with the pliers and pull down on it while twisting back and forth. In case you do not have them handy, I have provided a link to the install instructions.
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  • Recommended Timbren Suspension Enhancement for a 2015 GMC Sierra 3500
    The recommended Timbren system for your 2015 GMC Sierra 3500 is the part # TGMRCK25D. This will provide you with 8,600 lbs of additional suspension support. You should note that this will not increase the towing capacity of your vehicle. It only allows you to carry your current towing capacity in a safer manner.
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  • What is Overall Height of Timbren SES Kit # TGMRCK25D
    Overall height is 5-3/16 inches. That means that once installed, the double convoluted springs from the Timbren SES Kit, # TGMRCK25D, will sit 5-3/16 inches below the jounce bumper holder on the frame. The outer diameter of these springs is 4-5/16 inches.
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  • Suspension Enhancement Recommendation for 2019 Chevy Silverado 3500
    For your 2019 Chevy Silverado 3500 the suspension enhancement I recommend is the Timbren kit part # TGMRCK25D because it's compatible with fifth wheel rail kits like you have, it can provide up to an additional 8,600 lbs of support, and unlike air bag kits you never have to mess with air pressure or compressors. Basically you just install the kit and never have to worry or think about it again.
    view full answer...
  • How to Remove the Rear Bump Stops on a 2012 Chevrolet Silverado 3500
    When we removed the rear bump stops on a 2016 Chevy Silverado 2500 to install a set of the Timbren Rear Suspension Enhancement System part # TGMRCK25D, we found that by using a screwdriver and placing the end between the jounce spring and mounting cup we were able to pry the spring down and outward as shown in the attached video. Unfortunately, we have not removed the bump stops on your exact truck (2012 Chevrolet Silverado 3500) but the 2016 Chevy Silverado 2500 we did remove them on...
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  • Rear Suspension Enhancement for 2017 Chevy Silverado 3500 Towing Fifth Wheel Trailer
    Yes, a Timbren kit like the part # TGMRCK25D would be exactly what you'd need to beef up the rear suspension of your 2017 Chevrolet 3500HD Duramax when towing a fifth wheel trailer. This is a confirmed fit for your truck and will provide you with additional support when towing. I attached an install video for this kit for you to check out as well. I like the Timbrens because they don't require you to monitor air pressure like the air bag kits do and the install in much simpler.
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  • Timbren Weight Ratings Explained, Recommendation for 2015 GMC Sierra 3500
    The weight rating for Timbrens like the part # TGMRCK25D that you referenced is the amount of additional suspension support they will provide the vehicle they are installed on. You should note that Timbrens do not actually increase the towing capacity of the vehicle they are installed on. They will provide additional support so that the vehicle can carry it's current capacity in a safer, more level way. I attached a help article on Timbrens for you to check out as well. These have been...
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  • Should Upper Control Arm Stop be Cut After Lift Kit is Installed on Truck
    If you cut the control arms stops off of your vehicle all of the steering and suspension components will wear out quicker and the vehicle might handle unpredictabley as you'll over extend not only your shocks but ball joints, tie rods, and cv axles. Best option is to replace the upper control arms with ones designed for lift kits.
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  • Timbren Suspension Enhancement Recommendation for 2015 GMC Sierra 2500 Towing Heavy Trailer
    We can never safely recommend you exceed the towing capacity of a vehicle, but also we aren't an authority on GM truck towing capacities as we aren't involved with the towing capacity determination. It is possible though that the capacity you listed is for the truck bed and not the pin weight of a fifth wheel/gooseneck trailer. There is a difference as the truck bed weight rating is based on the sheet metal of the bed and pin weight capacity is for the frame since that's where the hitches...
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  • Recommended Suspension Enhancement For 2015 Chevrolet Silverado 3500 Towing A Fifth Wheel
    The pin weight of a trailer can cause the ride to be uncomfortable at times. If everything is adjusted properly on the fifth wheel hitch and trailer you can help reduce the road shock and loping as you called it by using suspension enhancement. I recommend installing a Timbren Rear Suspension Enhancement System # TGMRCK25D on your Silverado 3500. This system will not affect the ride of your truck when empty but acts like a shock absorber when the truck is placed under load(like hauling...
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  • Suspension Enhancement Recommendation for 2018 Chevy Silverado 3500 Cab and Chassis
    For your 2018 Chevy Silverado 3500 cab and chassis we have suspension enhancement but not an air bag solution. For that we have Timbren springs like the # TGMRCK25D which are a great solution. What's great about these is there are no air lines to run or air pressure to maintain.
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  • Timbren Suspension For GMC Sierra 3500HD With Duallies
    Yes, I am pleased to let you know that the Timbren Rear Suspension Enhancement System # TGMRCK25D is confirmed to fit the 2017 GMC Sierra 3500HD with duallies. These are also jounce style springs that get progressively stiffer as more weight is applied to them, no maintenance is required, limited lifetime warranty, and they work independently side to side. I have linked a video showing an example installation for you. The severe-use Timbren suspension is for vehicles like tow, dump, snowplow,...
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  • Timbren Suspension Kit Recommendation for 2011 Chevy Silverado 2500HD
    If you are over the towing capacity for your truck I can't recommend anything that will make it safe to exceed that figure but we do have suspension enhancement kits for your truck which are designed for providing additional suspension support to help reduce sag. I really like the Timbren kits as they are maintenance-free and easy to install. Air bag kits are great too but they have a more involved install and require you to maintain air pressure. So for a Timbren kit confirmed to fit...
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  • Timbren Kit that Fits 2016 Silverado 2500 w/20 inch Rims
    Yes, the Timbren kit part # TGMRCK25D that you referenced will fit your 2016 Chevy Silverado 2500HD that has 20 inch rims. Nice looking truck! I attached an install video as well.
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  • Rear Helper Springs for a 2017 GMC Sierra 3500 Dually 4-Wheel Drive
    I do have a solution for you but I checked with SuperSprings and none of the Sumo Springs are listed as a fit for the 2017 GMC Sierra 3500 dually. But for a similar part that will fit I recommend Timbren springs # TGMRCK25D. These are also jounce style springs that get progressively stiffer as more weight is applied to them, no maintenance is required, limited lifetime warranty, and they work independently side to side. I have linked a video showing an example installation for you.
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  • Are Timbren Springs a Good Solution for 2017 Chevy Silverado 2500 Towing Fifth Wheel Trailer
    Timbrens are a perfect solution for your 2017 Chevy Silverado 2500 that is towing a fifth wheel trailer. They replace the bump stops and provide an additional spring that engages when the suspension gets compressed. Basically this acts as a supplemental spring when carrying a heavy load like when you are towing a fifth wheel trailer. I attached an install video for this for you to check out as well.
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  • Recommended Suspension Enhancement for 2018 Chevy Silverado 3500HD with Arctic Fox Slide-In Camper
    To better support the weight of your Arctic Fox 865 Camper I highly recommend the Timbren Rear Suspension Enhancement System # TGMRCK25D. These heavy-duty Aeon hollow rubber springs will greatly increase stability on the road with that camper attached. Since they basically act as shock absorbers they (along with the other suspension components you have already added) will go a long way towards extending the life of the truck's factory suspension. The springs themselves have an 8,600 pound...
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  • Will Timbrens for a 2019 Chevy Silverado 2500 Prevent Porpoising While 5th Wheel Towing
    The Timbren Rear Suspension Enhancement System part # TGMRCK25D which is a fit for a 2019 Chevrolet Silverado 2500 will help to reduce porpoising. The porpoising is caused by the suspension flexing which is a result of the heavy pin weight. The Timbrens will help stiffen the rear suspension which will then help prevent the trailer from rocking back and forth i.e. porpoising.
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  • How Tall Are the Timbren Springs for a 2018 GMC Sierra 2500
    The Timbren Rear Suspension Enhancement System part # TGMRCK25D which is a fit for a 2018 GMC Sierra 2500 will measure 5-1/4" tall without the 1" spacer or 6-1/4" tall with the 1" spacer. I have attached a photo below. The springs should not be engaged without a load, if the suspension was worn or there was weight in the bed that could then cause them to be engaged but that's about the only thing that would cause this. The vast majority of installs will not produce the engaged unloaded...
    view full answer...
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  • Determining If 1" Spacer Included with Timbren TGMRCK25D Needs To Be Used On 2013 Chevy Silverado
    The Timbren Rear Suspension Enhancement System # TGMRCK25D you were looking at for your 2013 Chevrolet Silverado 2500HD 4x4 are 5-1/4" tall without the 1" spacer, or 6-1/4" tall with it. You want 1" - 1-1/2" gap between the # TGMRCK25D and the axle so if this gap is 6-1/4" - 6-3/4" you won't need the included spacer, or if the measurement is 7-1/4" - 7-3/4" you will need the included 1" spacer. I included a video of the # TGMRCK25D being installed for you to take a look at.
    view full answer...
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