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  1. Vehicle Suspension
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  3. Towing/Load Leveling
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  6. Rear Axle Suspension Enhancement
Timbren Rear Suspension Enhancement System
Timbren

Timbren Rear Suspension Enhancement System

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$269.36
Retail:$316.90
You Save: $47.54
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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  • Reviews (5652)
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Timbren Vehicle Suspension

  • Towing/Load Leveling
  • Bump Stops
  • Timbren
  • Extra 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. 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 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. 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.



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:

Ratings & Reviews

4.7

4015 reviews
5 Stars
(3197)
4 Stars
(530)
3 Stars
(119)
2 Stars
(77)
1 Star
(92)
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:

Easy install. Provides more stability and control when pulling our RV



by:

Fit perfect, install in five to ten minutes. Work as advertised. Shipping super fast



by:

Easy install, about one hour with minimal mechanical ability.



by:

Installed easy enough with directions going camping next weekend will re post



by:

No issues after one year.



by:

Works great easy to install.



by:

Parts arrived as scheduled. Assembly was easy. Thank You Kelsey.



by:

Has been working great



by:

Excellent service, great prices and fast shipping. Even had a return of my own fault. No questions asked, quick return and credit. Highly recommend.



by:



by:

Went on great and made a huge difference in the load squat.



by:

Grate for hauling heavy loads



by:

fast shipping ,great instruction to install, 15 to 30 minutes to install , made a world of differance



by:

Just what I ordered. Easy to install. Took about an hour.



by:

It's an awesome product



by:

This is a fantastic product, strong and sturdy! It was very easy to install, overall 1 hour. Will update after I pull my 20’ snowmobile trailer.



by:

Thank you



by:

Product was what I ordered, just put them in which was very easy. Don’t know for sure how they well work, give me a couple weeks or months to try them out.



by:

gimmicky. regret buying them.



by:

Works well for intended use.



by:

Excellent product, love them!



by:

Definitley much heavier than stock. Very easy install.



by:

Have not tried them yet but very easy install slight bump in the back when bouncing but other than that seem like theyll work great



by:

I still have to try them out but they were a snap to put on.



by:

Awesome product!


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4015
Show More Reviews

See what our Experts say about this Timbren Vehicle Suspension

  • Suspension Enhancement for 2020 GMC Sierra 2500
    If you're towing most of the time then I would go with the Timbren Rear Suspension Enhancement System # TGMRCK25D. These will provide the most support for your 2020 GMC Sierra 2500 while towing your 5th wheel. If you're more concerned about ride quality then the RoadActive Suspension # RAS3611-HD would be the better choice. The Timbren has a tendency to be a bit rough when you aren't towing or hauling. If you want the best option possible I would go with the Firestone Air Bags # F2709....
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  • Timbren or Hellwig Load Pro for 2023 Chevy Silverado 2500
    Hey Uwe, I would definitely go with the Hellwig Load Pro 35 part # HE93XR over the Timbren. The Timbrens are notoriously harsh and bouncy and since that's not what you want I would definitely avoid them at all costs. Hellwig will give you the support and stability you are wanting while actually improving the ride quality instead of hurting it. I have another option you might be interested in too if you'd be interested in?
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  • Compatibility of the Air Lift LoadLifter 5000 Springs on a 2016 Chevy 3500 Cab and Chassis DRW
    The Air Lift LoadLifter 5000 Helper Air Spring, # AL88339, is confirmed to fit the 2011 to 2015 Chevrolet Cab and Chassis 3500. However, my contact at Air Lift confirmed that the there are no air helper spring kits that fit the 2016 and on models. But I have a solution for you. We do carry the Timbren Rear Suspension System, # TGMRCK25D. This system will replace the OEM bumps stops located on the rear axle of your 2016 Chevrolet Silverado 3500 Cab and Chassis. The Timbren Aeon rubber...
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  • Rear Suspension Helper Springs for a 2018 GMC Sierra 2500 Towing a 5th Wheel Trailer
    Hello, I will be happy to help you select some helper springs to improve the ride and level out the truck when you are towing. Timbren springs are an easy install but they will make the ride stiffer when you are not towing. The similar SumoSprings Solo # SSR-207-47 will also level out the truck but will not be as stiff when not towing compared to the Timbren springs. Another option to consider is RoadActive Suspension # RAS3611-HD. Installation is easy with this kit as well. It will...
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    Image 1 for
  • Does Using an Offset Gooseneck Ball Change where the Pin Weight is Carried in the Truck Bed
    If you were to use the 4 inch offset ball # BWGNXA4085 the pin weight on the ball will not be changed. What will change is where the weight is carried on the truck. Using the offset ball will put more weight 4 inches back from the center of the gooseneck ball hole in the truck bed. This may or may not affect the truck. Some things that could happen include reduced steering and braking and headlights angled upward. If the weight is far enough behind the rear axle it can lift the front...
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  • Does Timbren Suspension Enhancement Fit 2025 Chevy Silverado 2500 ZR2
    Hey Jordan, Yep, I went ahead and verified directly with Timbren the Timbren Suspension Enhancement System - Severe Service # TGMRTT35D are indeed a fit for your 2025 Chevy Silverado 2500 ZR2. That said, the Severe Service kit is designed for trucks that have in-bed campers or are used as work vehicles (like salt spreaders, etc.). So if you have an in-bed camper you keep on this will be great, but if you want the suspension upgrade for things like helping stay level while towing a trailer,...
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  • Suspension Enhancement Recommendation for 2016 GMC Sierra 3500 for Smoother Ride Unloaded
    We have found that the Timbren setups affect the unloaded ride quality of a vehicle more than the other suspension enhancement solutions. For a similar solution that we have found to be a bit less harsh the Firestone Work-Rite kit part # F8632 would be a great option.
    view full answer...
  • Why Can't Timbren Be Used with 2025 Silverado Trail Boss (It Can!)
    I just confirmed with Timbren that the # TGMRCK25D DOES fit the 2025 Chevy Silverado 2500 Trail BOss.
    view full answer...
  • Lifted Truck Still Sagging with Equal-i-zer Weight Distribution System
    The adjustments for the Equal-i-zer Weight Distribution Systems like part # EQ37120ET will pertain to adding and removing washers from the head to try and get the spring arms as parallel with the trailer frame as possible. However, this may not completely level your vehicle. The majority of these systems are only designed to gain back half of what you lost and since your vehicle is lifted, there is an even greater chance that the vehicle will not be completely level. If you still seek...
    view full answer...
  • Which Timbren Kit Fits 2013 GMC Sierra 2500
    Hey Lyn, the correct Timbren kit for your 2013 GMC Sierra 2500 is the part # TGMRCK25D. This will offer you quite a bit of additional suspension support for your camper.
    view full answer...
  • Recommended Suspension Enhancement For A 2007 GMC Sierra 2500 With An In-Bed Camper
    Hi Mary, Do you leave the camper in the bed most of the time or does this truck spend a good chunk of time driving around without the camper? The SumoSprings Solo Custom Helper Springs # SSR-211-54 would be a great option if you leave the camper in the bed all the time. They take about 20 minutes to install and would just essentially replace the factory jounce stops for hassle-free, no-maintenance load leveling support. These have a 2,800lb capacity so they're be a bit stiff when the...
    view full answer...
  • Why is Truck Fifth Wheel Towing Capacity Much Higher than Cargo Capacity
    Fifth wheel towing capacities are different from cargo weight capacities. The reason is mainly that a fifth wheel hitch essentially attaches to the frame of the truck (the strongest part of it), and the cargo capacity is more related to the weight capacity of the truck's bed. Your truck would have no problem with the weight of your fifth wheel trailer plus the cargo you mentioned adding.
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  • Suspension Enhancement for 2019 Chevy Silverado 3500 Cab and Chassis that is Towing Trailer
    We have suspension enhancement solutions that would work great on your truck but since it's a cab and chassis we don't have any air bag setups we can recommend.
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  • Comparing Timbren TGMRCK25D And TGMRTT35D For 2020 Chevy Silverado
    Hello Ken, thanks for reaching out. Both of the kits you mentioned, the Timbren # TGMRCK25D and # TGMRTT35D are correct for your 2020 Chevy 2500. The difference is the 25D is a standard duty kit, while the 35D is a severe service kit. The severe service kits are intended for vehicles with a constant heavy load in the bed like a truck bed camper, or salt spreader. They are designed to be constantly loaded. The standard duty kit is more suited for towing applications like travel trailers...
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  • Timbren Kit Recommendation for 2022 Chevy Silverado 3500HD with Slide In Camper
    Hey Ted, yes Timbrens would be a great option to add additional suspension support to your 2022 Chevy Silverado 3500. For that I would go with the part # TGMRCK25D though over the # TGMRTT35D as it would still give you the support you are looking for without being too harsh. The part # TGMRTT35D is a severe duty application which I would only recommend if you are basically at the capacity of your truck and won't ever really drive it without the slide in camper.
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  • Will Timbren TGMRCK25D Work On 2025 Chevy 2500 And 3500 Trail Boss? (Yes, It Will!)
    Hey Seth, thanks for letting us know. It looks like we recently had another of our customers confirm the # TGMRCK25D does work with the trail boss models as well. I will go ahead and add this page to the Q/A section for the # TGMRCK25D just so this information will be available for others to see. Thanks again!
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  • Recommended Suspension Leveling Kit for a 2011 GMC Sierra 3500 With In-Bed Camper
    Hey John, take a look at the Timbren Rear Suspension Enhancement System # TGMRCK25D. These springs are going to sit above the rear axle to help stabilize and level your Sierra, has a nice 8,600 lb capacity, and requires no drilling for install since they replace the factory bump stops. For an install shop near you, you can check out the "Installer Locator" that I've hyperlinked to this answer, and enter your ZIP code to show all shops in your area that'd be able to install these springs.
    view full answer...
  • Can Timbren Kit Also Fit with 2021 Chevy Silverado 3500 Air Bags
    The Timbren Rear Suspension Enhancement System # TGMRCK25D replace the factory bump stop on a truck, which unfortunately happens to be the same place as the air bag kits so you won't be able to install these together on your 2021 Chevy Silverado 3500. If your truck has the factory upper overload springs then an alternative option for you is the TorkLift StableLoad Suspension Upgrade # TLA7200. This installs to the sides of your leaf springs so it will fit with your air bag kit just fine.
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  • Recommended Timbrens For A 2023 GMC 3500 Dually With Truck Bed Camper
    Hello Steve, thanks for reaching out. The Timbrens will work great to level out your 2023 GMC 3500 dually with a truck camper installed. In fact, we recommend Timbrens quite often for truck that have a constant load in the bed like a slide in camper or salt spreader. For you I recommend the Timbren Suspension Enhancement System # TGMRTT35D. These will do a great job absorbing shock and leveling out your ride while you are carrying your camper. Installation is quite easy too. You will find...
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  • What is Temperature Range for SumSprings for 2022 Chevrolet Silverado 3500HD LTZ I was wonde
    The SumoSprings Rebel Custom Helper Springs # SSR-203-40-2 are a two piece design so when you aren't hauling anything they wouldn't really compress at all. SumoSprings has told us that these will remain functional down to negative 25 degrees so as long as you are at that temp or above they would function like normal. Beyond -25 the Timbren would be the better choice part # TGMRCK25D as they aren't affected at colder temps.
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  • Comparing Timbren and Firestone Suspension Enhancement for 2019 Chevy Silverado 3500HD
    There are a few options for suspension enhancement for your 2019 Chevy Silverado 3500 but the main types are air bags like the Firestone kit part # F2709 which fits your vehicle and the rubber spring style like the Timbren part # TGMRCK25D which also fit. The advantage the Timbren has is a quicker install, no maintenance ever, and a lower price. The Firestone kit has the advantage of fully adjustable whereas the Timbren gives you one preset amount of support. The Firestone kit does require...
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  • Recommended Suspension Enhancement for a 2013 Silverado 2500 Carrying a Lance Camper
    Choosing the best suspension enhancement system will depend on how often you have your Lance 865 on your 2013 Silverado 2500HD. If you will be keeping the camper on your vehicle full time, or close to full time, the Timbren Rear Suspension Enhancement System # TGMRCK25D will be a good option. This is a set it and forget it type product and will definitely get you the added support needed. However, this is not adjustable. I tend to prefer the Firestone Ride-Rite Red Label Extreme Duty...
    view full answer...
    Image 1 for
  • Can I Use The Timbren Severe Service Suspension Enhancement On My Silverado 2500HD For Towing?
    You will be okay with the Timbren Rear Suspension Enhancement System # TGMRTT35D on your 2021 Chevrolet Silverado 2500HD. Them being the Severe Service means that they are capable of holding up better in the long haul with always having weight on them. When you are not towing with either them or the # TGMRCK25D they will not even be in contact with the axle. so the majority of your driving you will not even notice a ride quality difference. And when you are loaded both of the springs will...
    view full answer...
  • Comparing Timbren Helper Springs for a 2015 Chevy Silverado 3500
    Timbren helper springs # TGMRCK25D and # TGMRTT35D have different designs. The springs for kit # TGMRCK25D are double-convoluted. For optimal balance between softness and toughness, fabricators choose the double-convoluted rubber spring. Taller than the single donuts, these springs are engineered to deliver superior ride quality and significant load capacity. The springs in kit # TGMRTT35D are single-convoluted. When space is limited or extra stability is required, fabricators and engineers...
    view full answer...


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