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Timbren Rear Suspension Enhancement System

Timbren Rear Suspension Enhancement System

Item # TFR350SDF
Our Price: $373.07
You Save: $65.84
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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 TFR350SDF can be ordered online at or call 1-800-940-8924 for expert service.
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Timbren Vehicle Suspension - TFR350SDF

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

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.


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


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

FR350SDF - Rear Suspension Enhancement System with Aeon Hollow Rubber Springs by Timbren

Installation Details TFR350SDF Installation instructions

This Product Fits The Following Vehicles

Customer Satisfaction Score:

Customer Reviews

Timbren Rear Suspension Enhancement System - TFR350SDF

Average Customer Rating:  4.7 out of 5 stars   (5565 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.


Hi quality parts but worthless instructions. No sequence of assembly and the orientation of the brackets are totally wrong in the illustration. You should pre assemble the bracket to the rubber bumper then install that in the truck frame.



Just as well as it did on day one. I am so happy with it that recommended it to my son who wants to install airbags. Now he is thinking about it. He drives a 2016 F250.

2016 Ford F-350 Super Duty

Installed these Timbrens on my 2016 F350 to enhance the stability of my truck for a slide in truck camper. Have loved the results of them. They have noticeably helped leveling the truck/camper combo, and sway while driving. When the camper is off the truck these are not engaged. Have had no issues and would recommend them.

Ford F-350 Super Duty

I've had the Timbrens installed for about a year now and can report that they have done exactly what I wanted from them. The install was pretty easy (did it in the driveway using my creeper).
My F350 was squatting a bit from the 3000# pin weight and I wanted to reduce that. Unloaded I can't tell they are there unless I hit a pretty big bump and when we're hitched they eliminate most of the squat and the truck is now pretty level when towing. I was thinking about installing air bags but went this route since it was simple and cost less. It's a great product!
I've read some complaints about a rough ride when unloaded and I think that's due to not getting the unloaded gap right during installation.
Submitting an "Installed" pic.

2016 Ford F-350 Super Duty

The Timbrens are great. I have not had the truck with a full load yet but I anticipate they will help bring the truck back to level. The install went well but we were not able to use the additional spacer even with the longer bolts. We were not able to put enough pressure on the bolt to get the nut started. I don’t believe I will need the spacers so it should be ok. The directions didn’t include the amount of torque that was needed so I sent e-trailer an email. They checked with Timbren and the torque is 1/4 turn after they are tight. Ive attached some pictures of the completed install.


Works Great and easy installation


We got these Timbrens for our truck that hauls a truck camper. Took the sway out of driving


I love the timbrens. Installed on a f350 with a Arctic fox 811 camper. They work awesome alot less roll then airbags.

2015 Ford F-350 Super Duty

My 2015 F-350 dually would always squat when I’d hook up my fifth wheel.
Towed it for the first time since purchase and install and the truck is nice and level. The ride is better also and after driving a bit without the camper I don’t really notice them. I love the simplicity of these over airbags and imagine they won’t be needing any maintenance or replacement anytime soon. Great simple solution. Not so easy for an old fat guy to install
laying under the truck in the driveway but I managed!

John R.


They work. It is nice towing nice and level now. The ride with the load on is good and smooth and very stable. I am still very happy I went them. Put them on and forget about them, no maintenance and no worries.

2016 Ford F-350 Super Duty

Installation was a breeze on my 2016 F-350 sbcc 4x4 thanks to the provided videos (didn't even need to jack up the truck). It has performed as advertised towing a 16,000 lb 5th wheel, no squat, rides great on most surfaces and handles curves with little effort. The frosting on the cake is the fact that they require no maintenance! I will never buy another set of air bags again!

Scott S.


Just came back from a 5,000 mile trip through 6 states towing a 16,000 5th wheel. We encountered everything from dirt roads to major city interstates. The Timbrens performed flawlessly as advertised.


Works great pulling our 5th wheel


Great service


Exactly as advertised


Wish I would have installed sooner.

2012 Ford F-350 Super Duty

This system worked very well. The Timbren system brought the truck back to level and also help the sway of the truck. This suspension Enhancement system went on a 2012 Ford F350 after adding a truck camper of 4000lbs.I am glad I went this way instead of air bags.


Although these timbrens worked better than the standard suspension I ultimately had to remove them and replace them with airbags which worked substantially better. They were relatively easy to install. I didn't see any issues with the quality of the product I just don't think it was sufficient enough to provide the additional suspension support for my heavy camper. The airbags work much better. My timbrens have spent now most of their time in a box in my garage still in near new condition.

2015 Ford Fusion

I have installed and used the Timbrens on my 2015 F350 dually with my 5th wheel Keystone Fusion RV for a year now. i have to say that the Timrens are not only easy to install but make the ride of my truck excellent not only on the highway but back roads as well that includes very twisty turns. Timbrens keep my truck level and i don't have to ever worry about airbag air pressure. i have owned airbags before and never again will i ever buy or use them. When you don't have a load in the bed or your RV hooked up the Timbrens ride above then axles.. Best investment for towing period!


Great product and installs easily. I did not use the spacer, so this allows the stock suspension about 1-1/2" of travel before contacting the Timbren units. I tow a 16K fifth wheel and the Timbren's handle this load very well. You can see the compression marking on the lower side of the Timbren when the trailer is hooked up to the truck. Just enough contact to keep the truck at a level stance. My stock "bump stops" were starting to fall apart from age and wear/tear. These Timbrens now add an extra level of suspension that makes the truck feel much more in control when pulling the fifth wheel.

2016 Ford F-350 Super Duty

I drive a F350 Super Duty, 2016, Crew cab, short bed. I pull a 38 FT, 16,500 GVWR goose neck 3 horse with living quarters. I was going to put in air bags as I was sick of slamming into my bump stops and my headlights aiming to the sky; oddly the trailer towed great except for those two items. I had thought about the Timbren's but was hesitant. After my trailer guys at Triple C in Watervliet, MI; great guys, told me they had stopped putting in air bags, but now suggested the Timbren enhancement system, I thought I would try it.
GREAT PRODUCT; cheaper than airbags, easier to install, no maintenance and works great. I put them and immediately drove the horses from Chicago to West Palm with no problems. Truck is almost perfectly level now. I did not have one of the shuddering slamming events I typically get 3 of in Indiana alone. I would strongly recommend.

Also; he service was great. The online ordering would have gotten it to me late, but I called and LaceyG was a huge help in getting it with that days shipments. She was also a big help on finalizing my decision.

2012 Ford F-350 Super Duty

I placed these on my 2012 F-350 SRW as an alternative to putting air bags on due to the price difference. The timbrens have worked well when pulling but has taken the rough ride of a one ton truck and made it worse under normal driving conditions. These don't allow for much travel of the suspension when going down the road and hitting normal bumps. If you're considering these or airbags spend the extra money on airbags and be done once and for all.

2008 Ford F-350 Super Duty

i have finally hooked up after installing Timbren rear suspension system it ended up being what i was hoping for took the sag out took the sway out of driving when pulling loaded trailers i have been missing my dually this system has sure helped with my 2008 f350 single wheeled pickup a lot cheaper than air bags did not give an excellent review because have not pulled enough to see how the system holds up

2013 Ford F-350 Super Duty

No complaints with Etrailer customer service and delivery time. I thought I would need the spacer, and while putting everything together to check the fit, the bolts were not long enough. I drove to hardware stores for longer bolts. Well I did not need the spacer, and wasted some time. The stock stops were a bitch to take off. The only method that worked was tie wrapping pliers to the stops to grip in order to turn the bolts. The Timbren stops went on very easy. I hooked up my trailer for a drive. The truck does not sag and does not bump up and down as before. I drive a 2013 Ford F-350 single axle. I took my wife for a ride with out the trailer and she feel the stiffness of the Timbren, but nothing uncomfortable.


Have not towed our fifth wheel with these installed yet which was the main reason for the purchase. Towed a dump trailer and the added stability was definitely noted. With my truck loaded as usual with several hundreds of pounds of gear (two tool boxes, wood dunnage for leveling camper, ladder, B&W Companion fifth wheel hitch/Turnover ball, floor jack, tire inflator, jumper cables, screw gun kit, two traffic cones, brooms, squeegee - you get the idea!) the Timbrens are in contact with the bumper bars on the axle setup. Was hoping that the springs would not be in contact during normal daily driving but the stiffening of the ride is more than tolerable. I did not install the additional spacers as I could tell it would just add more weight to the Timbrens when loaded for daily driving. I'm sure if my truck bed was truly empty I would be off of the Timbrens.

As for the five star rating without using these for the primary purpose I must say that is all on etrailer. They were great to deal with, answered a question I had very well and the shipping was extremely fast.


Easy install, and they do a fantastic job when pulling our 17k 5th wheel. Less than 1/2” of squat with them. They do cause a little stiffer ride, when empty, because the difference between the bump stop and Tembren is only about 1/2”. But well worth it, when they are doing their job while pulling. Well worth the money and would definitely recommend.

Ford F-350 Super Duty

This is my second set of Timbren SES, I had purchased this product previously ,for a F350 pulling a Sundowner Gooseneck Trailer. Updated truck, had to have another set.....NO trailer sway-sagging, excellent product, easy installation too. I would recommend this!

2016 Ford F-250 Super Duty

Bought the Timbren Susp. System for a 2015 Ford F-350 Super Duty used to pull a 16,000# fifth wheel trailer. Had this on my former 2012 Ford F-250 Super Duty used to pull a 12,000# fifth wheel and the Timbren Susp. System kept the rear from sagging when the trailer was loaded. Keeping the truck level really made the truck more stable and enjoyable to drive when pulling the fifth wheel.

Show More Reviews

See what our Experts say about this Timbren Vehicle Suspension

  • Best Suspension Enhancement for a 2016 Ford F-350 with Truck Bed Camper
    For your 2016 Ford F-350, I recommend using the Timbren Rear Suspension Enhancement System part # TFR350SDF which are going to do an excellent job of providing more support while hauling around your truck bed camper and are a very popular option for just this purpose. There shouldn't be any issues with the upgraded rear sway bar you have now. This kit is going to both increase the side to side stability but also more so help to reduce rear end sag. It comes with a spacer that can be added...
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  • Timbren Suspension Kit Recommendation for 2015 Ford F-350
    For your 2015 Ford F-350 crew cab short bed single rear wheel the Timbren kit part # TFR350SDF is a confirmed fit and will work great. This kit can provide up to an additional 8,600 lb of suspension support and fits versions of your truck that have and do not have the overload springs.
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  • Will The Timbren Rear Suspension Enhancement System Fit The 2015 F350 Tow Boss?
    I contacted Timbren on your behalf who confirmed that the Timbren Rear Suspension Enhancement System # TFR350SDF will fit your 2015 F350 Tow Boss with the upgraded axle. This kit does have a spacer included in the kit to adjust the ride height for applications as needed. Included are video resources with additional information to review.
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  • Does Timbren Rear Suspension Enhancement System Item # TFR350SDF Fit 2004 Ford F-350 Dually
    Yes, the Timbren rear suspension kit part # TFR350SDF is a confirmed fit for your 2004 Ford F-350 4x4 dually long bed.
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  • Do Timbrens for 2005 Ford F-350 Fit with Reese Fifth Wheel Rail Kit
    Yes the Timbren rear suspension kit part # TFR350SDF is a confirmed fit for your 2005 Ford F-350 and is compatible with the in-bed fifth wheel hitch you have installed currently. This will do a great job getting rid of the suspension sag you have experiencing as well.
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  • Suspension Enhancement to Reduce Squat Experienced When Trailer is Hitched to 2006 F350 Dually
    Adding an additional leaf spring would somewhat increase the height of the rear of your truck, as you suspected. A suspension enhancement product like the Timbren part # TFR350SDF you mentioned is primarily designed for loads placed in the truck bed. In most cases, using this product will somewhat decrease the squat you are experiencing, but the weight being applied to the rear of the vehicle will lighten the front end, resulting is decreased front braking performance and steering response. A...
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  • Recommended Timbren Rear Suspension Enhancement System for a 2016 Ford F-350
    The correct set of Timbren Rear Suspension Enhancements for your 2016 Ford F-350 is part # TFR350SDF. The Timbren springs will do an excellent job of helping support the added weight of your 5th wheel trailer while towing. In addition to support capacity, the springs will also do a good job of reducing body roll, improving handling, and extending the life of your existing suspension components. You can see a set of these springs installed on a similar 2013 Ford F-350 which I have attached...
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  • How to Install the Offset Timbren Rear Suspension Enhancement on a 2011 Ford F-350 Super Duty
    The Timbren Rear Suspension Enhancement System, # TFR350SDF, is confirmed to fit for a 2011 Ford F-350 Super Duty truck. The offset design Aeon spring will replace the OEM stop and will align with the rear axle. I have attached an installation video of the Timbren being installed on a 2013 Ford F-350 and a picture of the unit installed in the offset position on the Ford truck.
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  • How Tight Should Mounting Bolt Be with Timbren Jounce Spring Kit TFR350SDF for 2016 Ford F-350
    The Timbren rear axle jounce spring kit # TFR350SDF which fits your 2016 Ford F-350 Super Duty does not include specific torque specs so when you install these you'll simply want to snug down the bolts. I suggest 1/4 turn after the bolts stop rotating. I did check with Timbren and they confirmed the 1/4 turn should be just fine.
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  • What is Needed to Install the Timbren Rear Suspension Enhancement System on a 2015 Ford F-350
    The Timbren Rear Suspension Enhancement System part # TFR350SDF comes with everything you will need parts wise to install on your 2015 Ford F-350. The only thing that you will need that does not come with the kit is common tools such as a ratchet, socket set, and ratchet extension. As you can see in the attached install video, the process is very simple even for the most novice of installers.
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  • How to Determine Fitment of Timbren Rear SES on a 2011 Ford F-350 with 2-1/2 Lift
    To ensure proper fitment of the Timbren Rear Suspension Enhancement System # TFR350SDF on your 2011 Ford F-350 with the 2-1/2" lift you just need to measure from the frame surface where your OEM bump stop sits to your axle. This Timbren kit is 7-1/2" tall (including the 1/2" spacer) so if that distance measures between 7-1/2" to 9" this will fit your application, plus it is rated for up to 8,600 lbs. I have attached an installation video of this Timbren system on a 2013 F-350 that you...
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  • Which Timbren Rear Suspension Enhancement To Use On A 2008 Ford F-250
    I recommend going with the Timbren Rear Suspension Enhancement System Item # TFR250SDF for your 2008 Ford F-250. These are designed to support the weight in the back of the truck. Since your hauling a 5th wheel and the hitch weight is only 1430lbs the Timbren Rear Suspension Enhancement System Item # TFR350SDF would be overkill.
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  • Timbren Suspension Enhancement for a 1999 Ford F350 Dually
    I recommend part # TFR350SDE between the two. This is a direct fit for your vehicle. Part # TFR350SDF is designed for the cab and chassis variants only, and will work if you have this variant with a standard truck bed equipped (This is uncommon). Beyond a difference in spacer height, these kits are identical, so I've included an installation of part # TFR350SDF on a 2013 Ford F-350 that does have that uncommon setup. This should help you get an idea of how this kit installs onto your vehicle.
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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.
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  • Correct Timbren Rear Suspension Enhancement System for a 2011 Ford F-350
    The correct Timbren Rear Suspension Enhancement System for a 2011 Ford F-350 is part # TFR350SDF. This model is designed for standard applications (towing/hauling) with a factory bed.
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  • Timbren Kit for 1994 Ford F-350 Towing Fifth Wheel Trailer
    Yes the Timbren kit part # TFR350SDF is a confirmed fit for your 1994 Ford F-350 and would do a great job providing additional support for the rear suspension when towing a 5th wheel trailer.
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  • Which Timbren Kit HD or Lighter Duty for 2016 Ford F-350 That Hauls Campers Frequently
    The difference in harshness between the Timbren kits part # TFR350SDF and # TFRTT350F would be very noticeable. Especially when unloaded. Your truck is already going to have a rough ride as that is the nature of 1 ton trucks but the 12k Timbren kit will make for a very harsh ride when unloaded. I really wouldn't recommend that unless the truck is going to be loaded to near it's max capacity most of the time it will be on the road. For what you are looking to do I would go with the lower...
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  • Best Timbren Suspension System For 2008 Ford F-350 For 5th Wheel & Truck Bed Camper
    That's a good question, and between the two systems, the best one for your 2008 Ford F-350 for support while you are towing your 5th wheel as well as when you using a truck camper is the 8,600 lb option: - Timbren Rear Suspension Enhancement System # TFR350SDF The 8,6000 lb capacity of the # TFR350SDF is more than enough for both the pin weight of your 5th wheel as well as your truck camper. More than that though, the reason they are the best is because they are double-convoluted, while...
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  • What is the Estimated Installation Time for Timbren Springs on a 2008 Ford F-350
    Both the front Timbren kit # TFF350SDC and rear kit # TFR350SDF can be installed in about an hour per kit. It will help to have someone helping. These kits are fairly straight forward to install. I have included a link to the installation instructions for each kit for you. Installation times can change based on the installers level of ability and whether or not all of the tools needed are readily available. I have included a link to our FAQ article on Timbren springs for you.
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  • Front and Rear Axle Helper Springs for a 2013 Ford F-350 Dually 4x4
    To prevent sag when towing or carrying heavy loads in the truck bed you would just need rear helper springs on your 2013 Ford F-350. But this can put more stress on the front axle and suspension and the ride would not be as good if you used front and rear helper springs. With that said what I recommend is to start out with just rear springs because you could always add front helper springs later should you determine that you need to. For rear Timbren helper springs you can use # TFR350SDF....
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  • Recommendation On Timbren Suspension Enhancement System For 2011 Ford F-350 Pulling 10k 5th Wheel
    I contacted our representative at Timbren and she informed me that the Timbren Front Suspension Enhancement System, part # TFF350SDC, will work great on your 2011 Ford F-350 Super Duty 4x4. She informed me that part # TFF350SDC, will give you more stability, but is typically used on a truck with a snow plow. She recommended using the Timbren Rear Suspension Enhancement System, part # TFR350SDF, in addition to the Front Suspension Enhancement System, part # TFF350SDC since you will be pulling...
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  • Recommended Suspension Enhancement for 2014 Ford F-350 Super Duty Hauling 16 ft Trailer
    There is a suspension enhancement solution that will work for your 2014 Ford F-350 but the Timbren # TFRTT350F is designed for use with service vehicles such as tow trucks and would not be the best option for you. Instead I highly recommend the Timbren Rear Suspension Enhancement System # TFR350SDF which have an 8,600 lb capacity and will give your truck the support it needs when hauling your water tank and pressure washer skid. This system will not require any drilling and works by becoming...
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  • Differences Between Timbren Helper Springs TFR350SDF and TFRTT350F for a 2016 Ford F-350
    Timbren helper springs # TFR350SDF and # TFRTT350F both fit the 2016 Ford F-350. Kit # TFRTT350F is rated for 8,000 pounds but was designed for sever service vehicles such as tow trucks. Kit # TFR350SDF is rated higher at 8,600 pounds and fits regular consumer pickup models. The kits use different rubber springs and different upper brackets as well. I have linked the instructions for both for you to compare.
    view full answer...
  • What Timbren Rear Axle Suspension Kit Best for 2013 Ford F-350 DRW Pulling 5th Wheel Trailer
    Rubber jounce springs such as the Timbren # TFR250SDG that you referenced offer several advantages over air springs. Jounce springs generally cost less, they are easier to install and they require no maintenance or periodic adjustment. Also, since jounce springs do not engage the axle unless the vehicle is under load normal everyday ride quality will be unaffected by their installation, but when under load they will provide progressive resistance as the load increases. Please note that...
    view full answer...

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