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Timbren Suspension Enhancement System - Severe Service - Rear Axle

Timbren Suspension Enhancement System - Severe Service - Rear Axle

Item # TDRTT3500E
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8,000-lb Capacity hollow rubber springs sit above the rear axle to help stabilize and level your vehicle. Provides a comfortable ride by absorbing road shock and improving stability. Ideal for trucks with slide-in campers or an in-bed salt spreader. Lowest Prices for the best vehicle suspension from Timbren. Timbren Suspension Enhancement System - Severe Service - Rear Axle part number TDRTT3500E can be ordered online at or call 1-833-496-1390 for expert service.
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Timbren Vehicle Suspension - TDRTT3500E

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

8,000-lb Capacity hollow rubber springs sit above the rear axle to help stabilize and level your vehicle. Provides a comfortable ride by absorbing road shock and improving stability. Ideal for trucks with slide-in campers or an in-bed salt spreader.


  • Improves suspension, handling, and safety
    • Ideal for trucks with slide-in campers or an in-bed salt spreader
  • Provides additional support as needed so you always have a smooth, comfortable ride
    • Allows the leaf spring ample movement while cushioning light loads
      • Rides just as smoothly when you're not hauling a load
    • 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


  • Load-leveling capacity: 8,000 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

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.

DRTT3500E Timbren SES with Aeon Hollow Rubber Springs - Rear Axle - Severe Service

Installation Details TDRTT3500E Installation instructions

This Product Fits The Following Vehicles

Customer Reviews

Timbren Suspension Enhancement System - Severe Service - Rear Axle - TDRTT3500E

Average Customer Rating:  4.7 out of 5 stars   (4182 Customer Reviews)

8,000-lb Capacity hollow rubber springs sit above the rear axle to help stabilize and level your vehicle. Provides a comfortable ride by absorbing road shock and improving stability. Ideal for trucks with slide-in campers or an in-bed salt spreader.


My Timbrens work great. No adding or subtracting air for towing. No worries about air lines leaking or coming loose. Just hook up the 5th wheel and go. No muss, no fuss, no sag.

Very happy with the purchase process, best price, quick delivery.


They did not fit right on my 2021 power wagon, I had to modify to make them line up with my differential and had to buy shorter mounting bolts for the bracket plus they where already used

I am sorry to hear that these didnt work out well for you. Additionally, it is not our policy to return used items to the shelves and resell them as new. I will make sure our customer service team reaches out to you shortly.
-- Etrailer Expert Brooke M - 08/06/2022


2017 ram 2500 with coil springs. Wast of time, install with 1” spacer, truck road like a box of rocks, could feel every little bump, took 1” spacer off not much better at all, way to stiff of a ride, when you hit a bump you new it. Parts are already in box to go back. Not any fault or etrailer at all, they don’t make the product just sell it.


Very easy to install. Does exactly what they say it will do. I no longer experience the sag, roll, and sway that is associated with Ram 2500 coil suspension.

2020 Ram 2500

Bought them to remedy sway problem my rig (2020 Ram 2500 Hemi, with slide in camper) experienced recently. I was debating between add Timbren and a stronger sway bar. Decided to try Timbren first for cheaper price and ease of installation. Just returned from a camping trip from Tahoe last night without a single case of sway during 500 miles of driving. Highly recommend this product.

2020 Dodge Ram Pickup

Worked great. Fixed my sway issue on my 2020 Ram 2500 with a truck camper.


They do a lot for stability for heaving towing the ride suffers a little empty


Watched numerous videos highlighting the Timbren SES and how to install on my 2019 RAM 2500. It seemed like a good idea due to the fact I tow a 5th wheel RV that almost maxes out the payload limit on my truck. I had them installed as instructed, which included installing the spacers, by a local garage. The ride home was an eye opener. The ride was very stiff and it felt like every bump in the road was magnified. Fortunately a few of the videos I watched suggested the install minus the spacers. I returned to the garage and had the SES reinstalled without the spacers. The ride home again was much smoother. I can't wait to hitch up my 5th wheel and go camping knowing I have the Timbren SES installed to help cushion the suspension of my truck.

2015 Dodge Ram Pickup

Installation was a breeze took about 20 minutes to install. I have a Travel Lite 840SBRX slide in camper on my 2015 RAM 2500 4x4 SB. My truck is lifted in the front for a level ride and when the camper was loaded it had little to no squat in the rear at all. The ride without a load is stiffer but not bad. Loaded with camper and they worked perfect. No roll in the corners and no porpoising.

2019 Ram 2500

They work as expected and installation was 20 mins

2020 Ram 2500

Installed on a 2020 Dodge 2500. The ride when empty is awful. Like riding in a wagon it is so stiff. I took out the round disk to give a little play between the stop and diff. Loaded my 4 Wheeler on a trailer and it was terrible. I hate to hook up my 34 foot toy hauler. I'm afraid the truck will beat me to death, it is so stiff.
Therebis absolutely no give here. I am surely disappointed and will remove these and try something else. Air bags


Awesome service


Super easy to install, let's see how long they last. The local truck camper dealer says he has been installing them for 10 years and no failures.

2015 Ram 2500

Easy to install. Pickup remained level with loaded trailer. Got exactly what I wanted.


2022 Ram 2500


Product still working great.


Awesome thank you so much I haven't hooked my trail or up yet



2021 Ram 2500

2019 Ram 2500

2019 Ram 2500



Review from a similar Timbren Aeon Spring System in Vehicle Suspension

Worked great on our 2019 Honda Odyssey Elite to the East coast.Fully loaded with 4 people and a car top carrier,the Timbrens kept the van stable and level.
Sold the 2019 but took the Timbren system out and put them in our new 2022 Elite. Very easy to install, highly recommend.


Review from a similar Timbren Aeon Spring System in Vehicle Suspension

I used this on my Isuzu tow truck. The blocks in and of themselves are fine, they support the weight. Here's the problem: They are pre-loaded, meaning that they always touch between the frame and the rear axle. As you load the vehicle this puts more pressure on the frame in this 5" area where the blocks are. The springs have not yet taken as much weight as they normally would. Now, all this upward pinpoint pressure bends the frame. This is what happened to me on my rollback tow truck. After many hours and now double plating the frame all is well again, but a tremendous amount of work. Yes, the blocks are fine, but the result of installing this product resulted in a bent frame. The vehicle was not overloaded and was within the GVWR.

I have reached out to the manufacturer who will be reaching out to you.
-- Etrailer Expert Jenny N - 01/20/2022

Show More Reviews

See what our Experts say about this Timbren Vehicle Suspension

  • Recommended Timbren Suspension Enhancement for 2018 Ram 2500
    Since you will be hauling a slide-in camper on your 2018 Ram 2500 you will want to go with the 8,600 lb Timbren # TDRTT3500E. I checked with Timbren and their recommendation is if you have a slide-in camper the best option is the severe service kit, as that will give you the best stability for your application.
    view full answer...
  • Timbren Recommendation for 2016 Ram 2500 with 2,600 lb Slide In Camper
    For the weight of your slide in camper the heavier duty Timbren kit part # TDRTT3500E that you referenced would be the way to go. This can provide up to an additional 8,000 lbs of suspension support so it will work well for your application.
    view full answer...
  • Does Timbren SES Kit TDRTT3500E Fit A 2017 Ram 2500 Power Wagon?
    I reached out to my contact at Timbren and the Timbren Suspension Enhancement System # TDRTT3500E you were looking at is indeed a confirmed fit for your 2017 Ram 2500 Power Wagon. This kit provides 8000lbs of load leveling support to keep your truck from sagging when carrying a heavy payload, or towing a trailer. I included an installation video of the # TDRTT3500E for you to take a look at.
    view full answer...
  • What Can I Do to Minimize Bucking in My 2020 Dodge Ram 2500 With Hawk Pop-Up Camper
    The product I recommend to help with the bucking/lurching issue with your 2020 Dodge Ram 2500 is the Timbren Suspension Enhancement System - Rear Axle # TDRTT3500E.The Timbrens install in place of the factory bump stops shown in your picture. They'll engage a lot sooner than the bump stops supporting your suspension to help reduce the bucking you're experiencing.. These springs work independently of each other and will improve your stability on uneven roads. I have linked a video to the...
    view full answer...
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  • Space Between the Timbren Suspension Enhancement System and Axle on a 2022 Ram 2500
    You will want a space between the Timbren Suspension Enhancement System - Rear Axle item # TDRTT3500E and your axle. The installation instructions call for a 1 inch gap. The only time there shouldn't be a space is when the rear of your 2022 Ram 2500 is loaded down in the bed or hauling a trailer.
    view full answer...
  • Troubleshooting Loose Timbren Spring of 2022 Ram 2500
    There's a nut that needs to be held in place when tightening the bolt that holds the rubber spring of the Timbren kit part # TDRTT3500E for it to actually tighten otherwise the bolt will just turn. If you fast forward to the 3 minute mark of the install video link I attached to this page you'll see what I mean.
    view full answer...
  • Will Timbren TDRTT3500E on 2019 Ram 2500 Always Touch Axle
    For the heavy duty, single Timbrens like the # TDRTT3500E on your 2019 Ram 2500 that are for trucks with a camper or severe service vehicles, they will actually always be touching the axle. There are standard, double convoluted Timbrens that should have a gap, but the ones you have are meant to be touching the axle.
    view full answer...
  • How To Fix 2020 Ram 2500 Rocking Back and Forth With Heavy Load/Trailer
    The issue you are having with the truck rocking back and forth due to the heavy load in the rear is referred to as porpoising and a common problem when towing or hauling. I have a few different options to help with this. If you are looking for a rugged sort of set and forget option then I recommend the Timbren Suspension Enhancement System part # TDRTT3500E. If you are looking for an option that you can adjust for the best mix of support and comfort then I recommend the Air Lift LoadLifter...
    view full answer...
  • Recommended Rear Suspension Enhancement For A 2022 Ram 2500
    If you are asking about a front leveling kit on your 2022 Ram 2500 affecting a rear suspension enhancement system, then I can say that it will not. However, if you are asking about a front leveling system helping with rear sag and preventing the front of your truck lifting up, then I have to say it will not do either of these things, unfortunately. With that said, supplementing the rear suspension will assist with both of these things. The Timbren Rear Suspension Enhancement System # TDRTT3500E...
    view full answer...
  • Recommended Suspension Enhancement For A 2018 Ram Power Wagon With AEV HD Suspension
    If you are looking for something smaller than the Firestone Ride-Rite Red Label Extreme Duty Air Helper Springs # F2706 to shore up the suspension on your 2018 Ram 2500 Power Wagon, you will want to look at a Timbren set up. Though I do prefer air bags, if they won't fit, then they won't fit. Granted I prefer them as they are adjustable so you can deflate them when you are not under load, but as you mentioned using a slide in camper, I would have steered you towards Timbren from the get...
    view full answer...
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  • Recommended Timbren Suspension Enhancement for 5th Wheel Towing with a 2015 Ram 2500 4x4
    Yes, the Timbren suspension enhancement system (SES) jounce-style springs will help to level your 2015 Ram 2500 when you are under a load. The correct part you want to use is # TDR2500D as the other part for the rear suspension, part # TDRTT3500E, is designed for service vehicles that are under a constant heavy load. I have attached a review video for the Timbrens as well as a photo that a customer sent in of this same system installed on their 2014 Ram 2500 for you to reference. One...
    view full answer...
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  • Which Timbren SES Do I Need for a 2017 Ram 2500
    The difference between the Timbren # TDR2500D and the # TDRTT3500E is that the TDRTT3500E are designed for commercial service trucks which will have a more beefy suspension system already and a slightly different frame. The TDR2500D is designed for the passenger vehicles like your 2017 Ram 2500, so this would be the Timbren SES you're looking for. Whether or not you have the off-road package on your 2017 Ram 2500 won't have any effect on which Timbren system you're using, so there's nothing...
    view full answer...
  • Recommended Timbren Bump Stop for 2018 Dodge Ram 2500
    A good fit for your 2018 Ram 2500 is the Timbren Rear Suspension Enhancement System # TDR2500D. With the weight you are hauling/towing, this help prevent your rear from sagging and keep your truck level. There's also the Severe Service Kit # TDRTT3500E, but that is more for use with a slide-in camper or salt spreader. The Timbren # TDR2500D I recommended for you is a better fit for your RV and fuel weight as well as for good loaded and unloaded ride quality. One thing to note is that...
    view full answer...
  • Will the Timbren Suspension Enhancement System Fit a 2015 Ram 2500 With Factory Air Suspension
    Yes, the Timbren Suspension Enhancement System is one of the very few suspension enhancement options that you have that will work on a 2015 Ram 2500 with the factory air suspension. That said, I would actually recommend the part # TDR2500D for your truck instead of the part # TDRTT3500E as these are more designed for service trucks or those with an in-bed camper.
    view full answer...
  • SumoSprings or Timbren, Which One Is Better for my 2022 Ram 2500 4WD
    I would be happy to help you setup your 2022 Ram 2500 4WD with some helper springs. I recommend the SumoSprings Rebel Custom Helper Springs item # SS27GR. These springs have a 5,000 lbs capacity when they are compressed at 50%. The best part about them is that they are a two piece system and the two pieces stay disconnected when the truck is unloaded. This allows the suspension to travel much more and provide a smoother ride. The Timbren Suspension Enhancement System - Rear Axle item #...
    view full answer...
  • Is Timbren Or SumoSprings Rear Suspension Enhancement Better For A 2022 Ram 2500
    Determining if the Timbren # TDRTT3500E or the SumoSprings # SS27GR is better for your needs will depend on your application. With the Timbren option having 8,000 pounds of load leveling capacity, they will of course be the more heavy duty option. They will definitely help with sag and body roll, but this is intended as a Severe Service kit. What I mean by that is it should be used with a slide-in camper, salt spreader, or something heavy in or on the bed of your truck. With these being...
    view full answer...
  • Troubleshooting Timbren Springs Contacting Axle On a 2017 Ram 2500 With No Additional Load
    The Timbren Rear Suspension Enhancement System # TDR2500D that you have for your 2017 Ram 2500 4X4 with the factory air suspension is designed to fit a vehicle with good suspension and vehicle lift or lowering kits. You should have 1/2" to 1-1/2" of clearance between the Timbren springs and your axle with your Ram unloaded. Seeing as your springs are touching with no weight you either have some kind of lowering kit on the rear of your truck to level it out or your springs have worn to the...
    view full answer...
  • Can I Use the Firestone RideRite Air Bags on a 2018 Ram 2500 with a Front Leveling Kit
    Even with the leveling kit on the front of your 2018 Ram 2500, you'll still be able to use the Firestone Ride Rite Air Bags # F2615 on your rear axle and they're going to do a great job helping fight squat when you're towing your travel trailer. In regards to raising the rear of the truck and changing the hitch height, this shouldn't be an issue since they're being used to bring the truck back to stock height after the tongue weight of the trailer is put on; if your truck suspension is...
    view full answer...
  • Recommended Rear Suspension Enhancement For a 2019 Ram 2500 With Slide In Camper
    The Timbren Suspension Enhancement System # TDRTT3500E is their severe duty kit that is specifically designed to be used with slide in campers. It will fit with the coil spring suspension you have on the 2019 Ram 2500. Do note that these are designed to always have the additional weight and if they only use their slide in camper occasionally it will cause a rougher ride when not loaded. The Air Lift LoadLifter 5000 Ultimate Plus Air Springs # AL89289 will allow them to adjust the air...
    view full answer...
  • Best Sway Control Suspension Enhancement for 2015 Ram 2500 With Truck Bed Camper
    When it comes to carrying a truck bed camper, I always go with Timbren Suspension Enhancement Systems over the SumoSprings Custom Helper Springs similar to the # SSR-312-54 . With that being said, I think the better solution for your 2015 Ram 2500 are the Timbren # TDRTT3500E, since they are specifically designed for trucks carrying truck bed campers. The Timbren # TDR2500D would also work but are meant more for carrying heavy payloads and may not provide as much body roll dampening. The...
    view full answer...
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  • Suspension Helper Springs for a 2015 Ram 3500 4x4 Towing 5th Wheel Toy Hauler w/5K Pin Weight
    For your 2015 Ram 3500 4x4 and your heavy toy hauler trailer I strongly advise going with a heavy duty option for rear helper springs. A light or medium duty just won't offer the support that you will need for this particular trailer. For SumoSprings the heavy duty part for your truck is # SSR-302-54. For Timbren springs I recommend using # TDR3500CA which is rated for 8,600 pounds. The one you mentioned, # TDRTT3500E, is for truck models turned into service vehicles and utility trucks....
    view full answer...
  • Frame Mounted Camper Tie Downs for a 2018 Ram 2500 with Factory Nerf Bars and Trailer Hitch
    If your 2018 Ram 2500 came with a factory installed trailer hitch which I can only assume it did then the correct set of TorkLift Custom Frame-Mounted Camper Tie-Downs for you is part # TLD2127 (front) and part # TLD3109 (rear) for steel or part # TLD2127A (front) and part # TLD3109A (rear) for aluminum. These are both no-drill options. If you have the Mopar rear-mounted kick out steps that are mounted under the bumper they will need to be removed. For a set of locking turnbuckles to...
    view full answer...

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Info for this part was:

Employee Leah B
Edited by:
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Expert Research:
Jameson C
Employee Jacob T
Video Edited:
Jacob T
Employee Chris R
Video Edited:
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Employee Mary E
Written by:
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Employee Wilson B
Updated by:
Wilson B
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Employee Shane H
Test Fit:
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