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  1. Vehicle Suspension
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Timbren Suspension Enhancement System - Rear Axle
Timbren

Timbren Suspension Enhancement System - Rear Axle

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$398.07
Retail:$468.32
You Save: $70.25
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 Suspension Enhancement System - Rear Axle part number TFR350SDJ can be ordered online at etrailer.com or call 1-800-940-8924 for expert service.
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Timbren Vehicle Suspension

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

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 have a smooth, comfortable ride when towing or hauling gear
    • Allows the leaf spring ample movement while cushioning light loads
    • Becomes more rigid as more weight is added for a 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 a 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 simple installation
    • Installs directly onto frame
    • No drilling required


Specs:

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


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

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


Diagram of the Timbren spring installed

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


Animation of a standard Timbren rubber spring

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


Timbren suspension system works to prevent body roll

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


An example of a trailers swaying

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


An empty truck on a bumpy road without Timbren

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


Timbren Suspension Enhancement Compared to the Competition

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



FR350SDJ Timbren SES with Aeon Hollow Rubber Springs - Rear Axle

Item # TFR350SDJ

Installation Details TFR350SDJ Installation instructions

This Product Fits The Following Vehicles




Customer Satisfaction Score:

Ratings & Reviews

4.7

3805 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:

Levels out my F150 when towing. Super easy to install.



by:

Installed these on a 2019 Honda Odyssey along with new shocks and made a night and day difference. Highly recommended



by:

as expected,fast shipping



by:

Just received them just install them looks like they work great etrailer is always right on spot



by:

Order was delivered earlier than promised and was exactly what I was looking for to enhance towing with my 24 Ford F250



by:

Arrived promptly. Installed easily. Seems like it will work for the purpose it was designed. What more can I say?



by:

Good, very Good, no problems, better as air ride!



by:

Ease of installation. Quality of produc t.



by:

Three times the size of original,easy i nstallation.



by:

Got the added support I needed to haul my boat. Big difference in the sag of the rear end of my vehicle



by:

Easy to place on vehicle, haven't put tailer on yet, but clearance is 1/2 to 3/4 inch, should be perfect.



by:

Easy installation and no sag. I am very happy.



by:

They were very easy and quick to install. First trip out with the travel trailer was successful.



by:

Great product, love the ride and installation was super simple! Thank you.



by:

Product arrived as promised. Crystal was a great communicator during my selection and ordering process. Listen to their advice. They know this business.



by:

Fast delivery, simple installation on my 2017 Sequoia and perform as advertised.



by:

just purchased these items and they arrived in two days. amazing. cant wait to install and try them out. thank you etrailer for your great service and fast delivery!



by:

Awesome product and fast shipping.



by:

It seems like it helps prevent the squat of my Ford F550 when we have loads on it. So far so good



by:

Quick shipping. Easy install. Have not put them to use yet.



by:

Great product. I haven't installed this set on my new truck yet, but I had them on my older truck and they did the job they were intended to do. Only problem was when the package arrived, the box was split open to the point of everything falling out. But no parts were lost, this time.



by:

They arrived early and intact. I am so happy to have these for my truck. They fit perfectly and only took about 15 minutes to install. I looking forward to putting them to the test when pulling my travel trailer.



by:

Just what my truck needed to stop the sag when I hook up to my 5th wheel.



by:

Thank you for your quick response for my need for a replacement part.



by:

Great product, easy install. Works as advertised. Fastest shipping!!A++


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3805
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See what our Experts say about this Timbren Vehicle Suspension

  • Will Adding Timbrens to My Ford F-350 Super Duty Help with the Chucking When Towing 5th Wheel?
    Hello Bruce, Great question. The correct Timbren kit for your 2022 Ford F-350 Super Duty is the Timbren Suspension Enhancement System - Rear Axle # TFR350SDJ. This fits both 2WD and 4WD models. Timbrens replace your factory bump stops with a progressive rubber spring. They engage as the suspension compresses under load and can help reduce rear-end squat when towing. If your truck is squatting and the trailer is riding nose-high, that can sometimes contribute to ride issues. In that...
    view full answer...
  • Will Timbren Suspension Enhancement Affect Onboard Scales System On 2026 Ford F-350?
    Hello John, thanks for reaching out, and congrats on the new truck. Yes, the Timbren Suspension Enhancement System # TFR350SDJ will affect the onboard scales on your 2026 Ford F350. The system operates by reading how level the back of your truck is. It will still work for lighter loads but anything that makes you sag to the point the Timbrens engage won't be accurate. Do you use the onboard scales a lot. What kind of trailer will you be towing?
    view full answer...
  • 2024 Ford F-350 Super Duty Correct Timbren Kit Fitment
    The only Timbren kit that fits your 2024 Ford F-350 Super Duty is the Timbren Suspension Enhancement System # TFR350SDJ rated for 8,600 lbs. Please note these are only designed to help support your OEM suspension, and it won't increase your load carrying capacity.
    view full answer...
  • How to Determine If a Spacer is Needed When Installing Timbren Springs on 2022 Ford F-350
    If you're wanting to install the Timbren # TFR350SDJ on your 2022 Ford F-350 then you'll want to measure the distance from where your factory bump stops are installed down to the point of contact on the axle. The Timbren # TFR350SDJ are 7-1/2" tall and according to the manufacturer you need to have 1/2" to 1-1/2" of a gap between the rubber spring and the contact point. If you measure from the place where your OEM bump stop sits down 7-1/2" and the gap that is left is between the 1/2" to...
    view full answer...
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  • Recommended Timbren Suspension Enhancement for Ford F-350
    Timbren Suspension Enhancement will definitely help with the rear end sag and help you to have a more stable ride. To get the correct fit for your truck, I need to know the model year. For instance if your Ford F-350 is between 2005 and 2016 then I recommend the Timbren Rear Suspension Enhancement System # TFR350SDF. However, if your truck is a 2017 or 2018, then I recommend # TFR350SDJ. These products work on single rear wheel trucks as well as dually models.
    view full answer...
  • Is The etrailer TFR350SDJ The Same As The Timbren FR350SDJ?
    Hi Greg! The # TFR350SDJ is just our part number for the Timbren Suspension Enhancement System - Rear Axle FR350SDJ. They are the exact same thing. I see you were looking at this for a 2025 Ford F-350 and I wanted to confirm that it will fit perfectly! Out of curiosity, what are you loading in your bed? This is a pretty heavy duty jounce and is typically used with in bed campers and stuff like that.
    view full answer...
  • Can Timbren Kit for 2017 Ford F-350 be Work with Rough Country 4 inch Lift
    Hey Scott, yes the Timbren kit part # TFR350SDJ that you referenced can be used on your 2017 Ford F-350 with a 4 inch lift kit but you'll need to also use the spacers part # A25723-90AH00. You'll need a total of 8 of the spacers plus you'll need to source longer hardware as well. Basically you'll need to take the bolts that come with the kit to a hardware store and get ones that are 4 inches longer in same size.
    view full answer...
  • SumoSprings or Timbren on a 2020 Ford F-350? Which is Better for a 5th Wheel Trailer?
    I always recommend SumoSprings over Timbrens for any vehicle that is not being used as a work truck. SumoSprings have two mounting points that only come together when a heavy load is placed on them. Timbrens will affect your daily driving and will give your rear end a bouncy stiff feeling when you are not towing. For your 2020 Ford F-350 you will want the SumoSprings Rebel Custom Helper Springs item # SSR-128-47-2. You will want to confirm your truck has a bump stop perch over the axle....
    view full answer...
  • Are Timbrens and Torklift Stable Loads Compatible on a 2020 Ford F-350?
    Yes, they will! The TorkLift StableLoad item # TL89CR that fits your F-350 is compatible with Timbren systems. The Timbren's mount over your axle just inside the leaf springs. For your 2020 Ford F-350 dually, I recommend the Timbren Suspension Enhancement System - Rear Axle item # TFR350SDJ. These have a 8,600 lbs capacity and come with custom fit brackets that bolt directly to your truck. I have linked an installation video below so you can see how to get them set up. If you have any...
    view full answer...
  • Will Timbren TFR350SDJ Fit 2026 Ford F350 4x4 SRW?
    Hello David, thanks for reaching out. Yes, the Timbren Suspension Enhancement System - Rear Axle # TFR350SDJ will indeed fit the 2026 Ford F350 4x4. Both our site and the Timbren site confirm this. It looks like you were looking at the # TFR250SDJ which are for an F250, so that is why it says they will not fit your F350. I can assure you the # TFR350SDJ will fit your truck and work great though.
    view full answer...
  • Which Timbren Kit Fits 2021 Ford F-350 Single Rear Wheel Long Bed
    Hey James, yep the Timbren kit part # TFR350SDJ that you referenced is a confirmed fit for your 2021 Ford F-350 single rear wheel axle long bed.
    view full answer...
  • Timbren Kit Recommendation for 2024 Ford F-350 with Welder Rig
    Hey Brian, for a heavy setup like what you have I would go with the Timbren kit part # TFR350SDJ as this will provide you the most support and these are super durable so you wouldn't need to worry about sag. How fast are you going through air bag kits?
    view full answer...
  • Recommended Lock for a Gen-Y 5th Wheel Hitch
    Hey Randy congrats on the new trailer. We do not have any coupler locks that fit a Gen-Y Gooseneck Pin Box like item # GY38FR. My only solution to secure your trailer is to use the Rack'Em Lock'em Magnum Wheel Lock item # RA-25. This lock fits 12" - 20" wheels and the rubber-coated arms will not scratch your wheels. I have linked a review video below so you can see the features of this lock demonstrated. What kind of trailer did you get?
    view full answer...
  • Best Timbren Suspension Enhancement For 2023 Ford F-350 Super Duty
    There are two Timbren systems for your 2023 Ford F-350, like you said, with the best definitely being the following part number: - Timbren Suspension Enhancement System # TFR350SDJ The reason for that is the # TFR350SDJ is designed for standard pickups while the other kit, part # TFRTT350J, is designed for service vehicles like a salt spreader, for example. The differences is that the # TFR350SDJ is double convoluted, which just means its shape is designed to compress more, giving you...
    view full answer...
    Image 1 for
  • Timbren Rear Suspension Enhancement System Compatible with 2017 Ford F-350 Super Duty
    First of all, thank you for your service. Unfortunately at this time we don't offer a military discount, but we do have free shipping most of the time on orders like this one. To confirm your fit, we have two sets of jounce springs available from Timbren that are confirmed to fit your 2017 Ford F-350 Super Duty. The Timbren Suspension Enhancement System - Rear Axle # TFRTT350J with a weight rating of 8,000 lbs and the # TFR350SDJ rated for 8,600 lbs. These springs will have a slightly...
    view full answer...
  • Are SuperSprings SuperSway or Timbren Springs a Better Option 2023 Ford F-350 Dually Reduce Sag?
    The SuperSprings SuperSway Stops # SS65GR are going to be the better option versus the Timbren # TFR350SDJ on your 2023 Ford F-350 Dually with upper overload springs. The Timbren's are designed to leave a 1" gap between the jounce spring and axle. This means you will get 1" of sag before they even begin to work. The SuperSprings are designed to make contact with the upper overload spring at stock height when unloaded. This will better help to reduce sag and the sway you are experiencing.
    view full answer...
  • TorkLift StableLoad Vs. Timbren for 2020 Ford F-350 Super Duty
    I talked to some of our guys down in our installation bays and based on the feedback I received, I definitely recommend the Timbren Suspension Enhancement System # TFR350SDJ for your 2020 Ford F-350 Super Duty. The TorkLift StableLoad # TLA7310S work by engaging your factory lower overload springs earlier than they would otherwise, which minimize sway and assist you when hauling heavy loads. However, disengaging this system requires you to get under the truck and use a rachet (not included)...
    view full answer...
    Image 1 for
  • Why Would Timbren On One Side of Truck be Compressed and Other Not at All
    The unloaded picture of your Timbren setup installed on your truck is concerning. Does the truck seem to sit level from left to right? Was it ever in an accident by chance? Are any of the suspension components worn out? You really shouldn't see that much compression on one side of the truck with that much gap on the other side unless something with the truck is bad.
    view full answer...
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  • Comparing Timbren FR350SDJ and FRTT350J for 2020 Ford F-350
    The correct Timbren Suspension Enhancement System for a 2020 Ford F-350 is part # TFR350SDJ. The part # TFRTT350J is designed for service body applications. The difference between them is height. The service body version is single convoluted and won't compress as much as the regular version which is double convoluted and will compress more. The more compression you get, the better the ride quality.
    view full answer...
  • Comparing Timbren TFR250SDJ and TFR350SDJ for a Ford F-250/F-350
    The only difference between the Timbren Suspension Enhancement System part # TFR250SDJ which is for a Ford F-250 and the Timbren Suspension Enhancement System part # TFR350SDJ which is for a Ford F-350 is that the latter comes with a 1/2" spacer, the spring and bracket are the same. If you want to go with the former and purchase the spacer separately then you'd need the Timbren 1/2" Spacer for Raised Frame Vehicles part # TA25722-90P00.
    view full answer...
  • Recommended Replacement Bump Stops for Slide in Truck Camper on 2022 Ford F-350
    The Timbren # TFRTT350J is a fit for your 2022 Ford F350 4x4, but its 8600 lb capacity would be overkill for your application, in my opinion. You'd have a pretty rough ride with the suspension under load. I believe you'd be happier with the SumoSprings # SSR-128-47-2 with its 5000 lb capacity. The SumoSprings are made of a more pliable material which would provide a better loaded (and unloaded) ride quality, The # SSR-128-47-2 is for vehicles with a bump stop perch over the axle, If you...
    view full answer...
  • Height Difference Between Timbren Kits FR250SDJ vs FR350SDJ for 2018 Ford F-350
    The Timbren # TFR250SDJ and the # TFR350SDJ that you referenced use the same bracket so the overall height difference is what you mentioned of 7-9/16 inches for the taller 350 and 6-7/8 for the shorter 250.
    view full answer...
  • Comparing the Timbren SES Part TFR350SDJ and Part TFR250SDJ for a Ford F-250/F-250
    The Timbren Suspension Enhancement System part # TFR350SDJ is correct for your 2017 Ford F-350 whereas the Timbren Suspension Enhancement System part # TFR250SDJ is for a 2017-2019 Ford F-250. The brackets on both of these systems are the same so you can use one on the other but the F-250 kit has a 4-1/2" tall spring whereas the F-350 kit has a 5-3/16" tall spring. Therefore, the F-250 kit will not engage as soon as the F-350 kit when used on a F-350. The later engagement will equate to...
    view full answer...
  • Recommended Suspension Upgrade/Enhancement for 5th Wheel Towing with 2022 Ford F-350
    Since you're not planning on using the truck for hauling, the load applied to the rear suspension of your truck will be consistent, which means that you won't need the adjustability provided by air helper springs, so we can rule those out from the get-go. The TorkLift # TLA7311 StableLoad features a swing-out tab that allows the overload springs to engage earlier which is a pretty clever device, but the problem is that you'll need to reach under the vehicle with a ratchet to engage and...
    view full answer...


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Info for this part was:

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