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Timbren Suspension Enhancement System - Rear Axle
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Timbren

Timbren Suspension Enhancement System - Rear Axle

Part Number: TFR350SDJ
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$398.07
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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 - TFR350SDJ

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

8,600-lb Capacity. These hollow rubber springs sit above the rear axle to help stabilize and level your vehicle. They also provide a more comfortable ride by absorbing road shock and improving roll stability. Easy to install and use.


Features:

  • Improves suspension, handling, and safety
  • Provides additional support as needed so you always have a smooth, comfortable ride
    • 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. 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.



FR350SDJ Timbren SES with Aeon Hollow Rubber Springs - Rear Axle

Installation Details TFR350SDJ Installation instructions

This Product Fits The Following Vehicles




Customer Satisfaction Score:


Customer Reviews

Timbren Suspension Enhancement System - Rear Axle - TFR350SDJ

Average Customer Rating:  4.7 out of 5 stars   (6426 Customer Reviews)

8,600-lb Capacity. These hollow rubber springs sit above the rear axle to help stabilize and level your vehicle. They also provide a more comfortable ride by absorbing road shock and improving roll stability. Easy to install and use.

by:
2022 Ford F-350 Super Duty

Took about 45 minutes to install. But that was 2 trips into the house cause my deep drive sockets were buried. F-350 gasser with 8’ box, Fiberglas cap, 200lb wooden storage drawers and estimated 400lbs in tools. I tow a 14k bumper pull dump that squats the truck. I installed the spacer with the timbrens and it sits on the original axle stop. Ride quality is unknown as I haven’t driven it yet.

Paul profile picture

Paul

6/22/2024

Still work great. Also tow a 24’ bumper pull camper. Timbrens definitely help. Selling this truck. I pulled the Timbrens and will be giving them to a friend that tows. I plan to get a set for the next truck. No complaints on function or ride quality.



by:
Ford F-350 Super Duty

Haven’t tested them with a load yet, so no opinion on performance yet.

Took more than the 15min I’ve seen posted in places. Not difficult, just hard to get to under my ‘22 F350 DRW. After opening the box, I noted that one of the rubber springs had a flat washer inside (which seems like a good idea to distribute force over a larger area). The other rubber springs did not have a flat washer installed in it (nor was it anywhere in the box). I had one in my garage so it didn’t stop my install, but for the price on these, I expect all the parts to be there.


Taking my first trip with them installed next week, so will see how they perform.



by:

Product was as described. Customer service keep me informed on the shipping and delivery progress.
Etrailer has always been great for me.

Willard T. profile picture

Willard T.

7/4/2024

After a year these are still working as expected and I recommend them to everybody I know that tows trailers.



by:

These keep my truck level with my slide in camper on board. It no longer rests on the helper springs. I have gained over 2” of height on the bed. Super easy to install. They also are noticeable on corners. Not nearly as much lean.



by:

The original timbrens were much too stiff and resulted in the elongation of the hitch pin holes. I opened a line of communication with Timbren had me make very specific measurements, and sent me replacement springs (shorter). I have not installed them yet (and have not found need for them). In my opinion these are only appropriate for heavy, permanent loads such as a slide in camper or welding setup and such.
I would not recommend them for periodic loading applications of less than 50% payload capacity on a 22 F350 SRW

Timbren customer service was excellent



by:
2018 Ford F-350 Super Duty

Product was easy to install, 1/2 hr taking my time. Used a open end wrench and floor jack. My 2018 F350 Super Duty Super Cab 4wd no longer plunges over bumps, it has lost all its rear end sway on turning, carries my load much smoother ( loaded all the time ). Even with the load I always carry, the vehicle sits 1” higher in the rear. Prior to the install I was constantly hitting the rubber stops on my factory overload springs.

Andrew profile picture

Andrew

6/10/2019

Excellent! I have since purchased another set from you for a 2019 F350 diesel. These things are just the ticket! The ride and handling is so much better!



by:
Ford F-350 Super Duty

In stalled these on my 17' F350 SRW, & these work great if you haul a gooseneck for a living or haul any type of trailer. No sag whatsoever,but lose maybe like 1-2" of height when loaded. From the price, they beat having to install bags that will eventually need maintenance.



by:

Easy to insall. Keeps my truck from squatting with a trailer on



by:

The Timbrens worked well however because of the rougher ride I chose to remove them and replace with airbags and onboard compressor. Being able to adjust the ride while pulling a heavy 5er, made for a much better ride. I would put the timbrens back on the truck if the airbags ever fail.



by:

This product work great,it eliminates the roll of the suspension. I would recommend this product.



by:
2014 Ford F-350 Super Duty

I've had the Timbren suspension on my F350 for a year and they work great, I tow a 5th wheel weighing 14,500lbs and no squat and no sway!



by:
Ford F-350 Super Duty

This is the second purchase of timbrens from Etrailer. I had installed timbrens on another F350. The installation is simple and they improved our towing experience.



by:

Items came as advertised and were easy to install. They have worked great for heavy loads or when towing our 40’ 5th wheel camper, and did not affect the normal ride of our 2019 F350 Ford Superduty truck!



by:

Simple to install. Fits like factory OEM bump stops. Much better than the competitor.



by:

They did exactly as advertised. Reduced bed travel downward when hooking up and maintained a good ride.



by:
2022 Ford F-350 Super Duty

Installation was extremely simple. So simple I was able to install this kit with one arm (elbow reconstruction 3 weeks ago). Can’t wait to see how it handles the 5th wheel.



by:
2023 Ford F-350 Super Duty

Already installed them on my truck and install went just as expected. Thanks etrailer for terrific customer service!



by:
2021 Ford F-350 Super Duty

These are great!! Removed the sideways motion in curves, removed the front/back rocking motion when crossing interstate bridge joints, and made the truck level with the camper attached. Simple installation as well.

Sean profile picture

Sean

10/17/2023

Product is still working great. No cracks or tears in the rubber. Still softening the bumps on the roads.

MikeL profile picture
Etrailer Expert

Mike L.

11/8/2023

@Sean Glad to hear your # TFR350SDJ Timbren Helper Springs are working well for you!


by:
2015 Ford F-350 Super Duty

I bought these to offset any squat that I may get while hauling my fifth wheel camper. It literally took me about 15 minutes to remove the old ones and put these onto my 2023 F350. Much easier than dealing with air bags.



by:
2020 Ford F-350 Super Duty

This is an excellent product, performs just as stated and does help with the ride when towing out fifth wheel



by:

These work great. I have had them a year. They work the same or better than air bags. Super easy to install. Minutes with a beer in hand.



by:

Great product! I had some body sway, and a little sag when loaded heavy in my F350. I have a steel flat bed so my pickups not empty when empty, these fixed my issue of it being squishy till the factory overloads kicked in.

Made the ride solid and firm, exactly what I was looking for. Makes corners great again for a heavy duty pickup, only thing a person may want to consider is if you have a heavy bed or loaded with tools, you’ll have to pick up the rear end to unload the springs enough to slip the timbren in.

Cant wait to get hooked up to the Rv and our dump trailer and see how much better it trailers, especially since it exceeded my expectations empty.



by:

After one year of use I am very happy. Easy to install; took 30 minutes at most. Levels truck and improves loaded ride. No change in unloaded ride.



by:

It looks like they are going to do the job. Easy install even had to take one back off to remove spacer. Gained back at least 1-1/2. Truck sits at least an inch off overloads. Little pricey I think for what they are but lot cheaper than air bags. Need to take after photo in day light.
2023 F350



by:
2019 Ford F-350 Super Duty

So easy to install on 2019 F350 SD Dually. just lift the back an inch by the hitch and can work right over the tires. no need to get dirty under the truck. I only drop 1.5 inches with my current fifth wheel, so these will just come into service when i load then family. Installed in less than 30 minutes.


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See what our Experts say about this Timbren Vehicle Suspension

  • 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...
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  • 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...
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  • 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.
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  • Will The Timbren Jounce Springs Fit With SuperSprings Helper Leaf Springs On a 2022 Ford F-350?
    Yes, the Timbren Suspension Enhancement System # TFR350SDJ can be used with the SuperSprings Custom Suspension Stabilizer and Sway Control Kit # SSA46 on your 2022 Ford F-350. The SuperSprings will mount to your leaf springs while the Timbren replaces the factory jounce spring. They will not interfere with each other.
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  • 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.
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  • Timbren Suspension Kit that Fits 2022 Ford F350 Dually
    Yes, the Timbren kit part # TFR350SDJ that you referenced is correct for your 2022 Ford F-350 dually.
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  • Does 2020 Ford F-350 with Leveling Kit Need Spacers When Installing Timbren Suspension Kit
    Typically a leveling kit for the suspension of a truck like your 2020 Ford F-350 is a slight lift to the front suspension so that the front and rear of the truck is leveled. Higher rated trucks like yours have the rear suspension sitting up quite a bit taller since the suspension is beefed up more back there to compensate for the weight of cargo or a trailer. So with a Timbren kit like the # TFR350SDJ that fits your truck installed you wouldn't need any spacers as long as only the front...
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  • Spacers for Timbren Suspension Enhancement on 2020 Ford F-250 Super Duty
    It is possible you can use the Timbren Suspension Enhancement System # TFR350SDJ (which is made for a Ford F-350) on your 2020 Ford F-250, but we have never done this and it hasn't been tested so I just can't guarantee a good fit. There are spacers that will work with your F-250 and the Timbrens that are designed to fit it, the Timbren Suspension Enhancement System # TFR250SDJ. You can add spacers in increments or 1/2" or 1" with the Timbren 1/2" Spacer # TA25722-90P00 and Timbren 1"...
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  • Recommended Suspension Enhancement For 2022 Ford F-350 Towing 5th Wheel Trailer
    We can get your 2022 Ford F-350 set up with suspension enhancement to beef up the rear suspension when you're towing your 5th wheel trailer, and for that I recommend Timbrens, with the correct fit for your truck being the following: - Timbren Suspension Enhancement System # TFR350SDJ The # TFR350SDJ will help your F-350's handling when you are towing as they will take the brunt of the added weight, engaging when needed to counteract sag and body roll, helping level your truck, stabilize...
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  • Will Timbren Rear Suspension Enhancement TFR350sdj fit 2022 Ford F-350 Dual Rear Wheel?
    They sure will! The Timbren Suspension Enhancement # TFR350SDJ you were looking at will work perfectly on your 2022 Ford F-350 Super Duty Dual Rear Wheel and will provide up to 8600lbs of load leveling support to keep your truck's suspension from sagging because of a heavy payload or heavy trailer. I included a video of the # TFR350SDJ for you to take a look at.
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  • Recommended Timbren SES for 2020 Ford F-350
    If you're carrying heavy payloads, the Timbren Suspension Enhancement System - Rear Axle # TFR350SDJ are the perfect solution and are a confirmed fit on the 2020 Ford F-350. The great thing about these Timbren SES Springs is that they only engage when the truck is loaded, so they won't effect your unloaded ride quality. The # TFR350SDJ will help lessen the strain on your stock suspension system, and because they work independently they'll help with off-center loads in the truck bed and...
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  • Compatibility of Timbren Suspension Enhancement With 2022 Ford F-350 Super Duty FX4
    The Timbren Suspension Enhancement System - Rear Axle # TFR350SDJ will fit your 2022 Ford F-350 Super Duty FX4. These will help increase stability and reduce vehicle sag when you're towing or hauling a heavy load. They work independently to help reduce body roll and compensate for off-center loads. The # TFR350SDJ installs directly onto the frame and will not interfere with your FX4 off-road package. I have attached an installation video for your reference.
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  • Suspension Enhancement Recommendation for 2017 Ford F-350 with Factory In-Bed Rail Kit
    The issue you are having is because you have the factory fifth wheel rail kit in your 2017 Ford F-350. Firestone does not list the # F2600 as a fit for the versions of the 2017 F-350 that have in-bed hitches like yours. For a kit that does fit your truck we have the Timbren kit part # TFR350SDJ. Not only will this fit with the factory rail kit but it also won't ever require you to maintain air pressure or run any air lines. It's basically a much simpler install that you never have to...
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  • Recommended Timbren Suspension Enhancement System for 2021 Ford F-350 Super Duty
    For your 2021 Ford F-350 Super Duty I recommend the Timbren Suspension Enhancement System - Rear Axle # TFR350SDJ. These have an 8,600 lb capacity and help with vehicle sag while increasing stability. The springs work independently so they help compensate for off-center loads and reduce body roll as well as absorb shock from bumps in the road. Since you carry heavy loads with frequency the ride quality is less of a concern when unloaded. Regardless, the Timbren system still have an inch...
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  • Recommended Timbren Rear Suspension Enhancement for a 2017 Ford F-350
    For your 2017 Ford F-350, you have two options. You can go with either the Timbren Suspension Enhancement System part # TFR350SDJ or part # TFRTT350J. I recommend using the Timbren Suspension Enhancement System part # TFR350SDJ as these aeon springs are rated for a higher weight capacity and are made of a thicker rubber. The hollow rubber springs sit above the rear axle below the frame to help stabilize and provide up to 8,600 lbs of load support capacity. They are designed to provide...
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  • 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.
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  • Recommended Timbren Suspension Kit for 2020 Ford F-350
    The best Timbren Suspension Enhancement System for your 2020 Ford F-350 is the Timbren # TFR350SDJ because they were designed with recreational towing in mind, as opposed to the kits which are meant to be used with more heavy-duty work trucks that have a constant load on them. The Timbren # TFR350SDJ that fit your 2020 F-350 are double-convoluted for more cushioning and support than the single-convoluted Timbrens like # TFRTT350J, which are also a fit on the 2020 Ford F-350. The Timbren...
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  • Is Timbren Rear Suspension For 2022 Ford F-350 Compatible With TorkLift StableLoad
    Yes, the Timbren Suspension Enhancement System # TFR350SDJ that fits your 2022 Ford F-350 is compatible with the TorkLift StableLoad. The two install completely separately so there won't be any interference between the StableLoad and the # TFR350SDJ.
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  • 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.
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    Image 1 for
  • Does Timbren Kit # TFR350SDJ Fit 2017 Ford F-350
    The dimensions of the Timbren kit part # TFR350SDJ you referenced are 8-1/2 inches wide by 10-1/2 inches tall by 6 inch diameter. This is a confirmed fit for your 2017 Ford F-350 FX4 and does not require you to use any type of spacers.
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  • 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...
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  • Do Timbren Suspension Enhancement Fit 2020 Ford F-350 FX4
    Unlike some air bags, the Timbren Suspension Enhancement springs do fit the FX4 models of 2020 Ford F-350, as there is no interference with the suspension. That said, the model you asked about, the Timbren # TFRTT350J, are not the correct kit for a standard truck, as those are designed for severe service vehicles like a tow truck. The correct Timbrens for your 2020 Ford F-350 FX4 for towing campers or hauling equipment are the following: - Timbren Suspension Enhancement System # TFR350SDJ I...
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  • Dimensions of Timbren Suspension Enhancement Spring for a 2018 Ford F-350
    From the top of the bracket to the bottom of the rubber spring the # TFR350SDJ Timbrens measure about 7-1/2 inches. When installed you ideally want about a 1/2 inch to an inch of space between the Timbren and its contact point. However, to install them you will be removing your bump stop. So make sure you measure where the bump stop mounts.
    view full answer...
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  • Does Timbren Suspension Enhancement Fit 2022 Ford F-350 Tremor
    Yep, it sure does; the Timbren suspension enhancement you asked about is a fit for your 2022 Ford F-350 Tremor. The correct part number is the following: - Timbren Suspension Enhancement System # TFR350SDJ The Timbren # TFR350SDJ are a really smart choice for optimizing the suspension of your F-350 because when you are towing or even just have a heavy load in your truck bed, the Timbrens are going to take the brunt of that weight instead of your leaf springs, which helps level and stabilize...
    view full answer...


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Info for this part was:

Employee Leah B
Edited by:
Leah B
Employee Mike L
Expert Research:
Mike L
Employee Jameson C
Expert Research:
Jameson C
Employee Jacob T
Video Edited:
Jacob T
Employee Dustin K
Video Edited:
Dustin K
Employee Chris R
Video Edited:
Chris R
Employee Cole B
Installed by:
Cole B
Employee Mary K
Updated by:
Mary K
Employee Wilson B
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Wilson B
Employee Michael B
Updated by:
Michael B
Employee Carrie F
Updated by:
Carrie F
Employee Bethann B
Updated by:
Bethann B
Employee Jonathan Y
Video by:
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Employee Anna W
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Employee Robert C
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