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  1. Vehicle Suspension
  2. Timbren
  3. Bump Stops
  4. Towing/Load Leveling
  5. Rear Axle Suspension Enhancement
  6. Extra Heavy Duty
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2015 Jaguar XKR
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Timbren

Timbren Suspension Enhancement System - Rear Axle

Part Number: TFRTR350HD
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$398.07
Retail:$468.32
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Vehicle Suspension
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2015 Jaguar XKR

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8,600-lb Capacity. These hollow rubber springs sit above the rear axle to help stabilize and level your vehicle. Becomes more rigid as more weight is added for great performance when you're hauling a heavy load. Great Prices for the best vehicle suspension from Timbren. Timbren Suspension Enhancement System - Rear Axle part number TFRTR350HD can be ordered online at etrailer.com or call 1-800-940-8924 for expert service.
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Timbren Vehicle Suspension - TFRTR350HD

Highlights

  • Custom Fit for Your Vehicle: Mounts to existing attachment points
  • 8,600-lb Load Support: Keeps your vehicle level and stable when hauling or towing heavy weight.
  • Safer Steering and Braking: Prevents rear sag so handling stays steady and braking feels consistent.
  • Reduces Body Roll and Sway: Independent rubber springs keep control when turning or hauling uneven loads.
  • Smoother Ride on Rough Roads: Rubber springs absorb bumps and prevent bottoming out under load.
  • No-Drill DIY Install: Bolts to the frame with included brackets and hardware for quick setup.

Features to know about

Stay Level and Confident Under Heavy Loads: 8,600-lb Rear Suspension Support

When the rear end squats under heavy weight, steering and braking can feel off. The Timbren Suspension Enhancement System adds up to 8,600 lbs of load-leveling capacity to keep your vehicle level and steady when hauling or towing. These hollow rubber springs stiffen progressively as more weight is added, improving stability and keeping your factory suspension from bottoming out. The result is confident handling and a level stance even when you’re carrying serious weight.

Truck with rear sag under heavy load demonstrating need for Timbren suspension enhancement system

Reduce Sway and Body Roll: Independent Spring Action

Heavy loads or top-heavy setups can make cornering and crosswinds feel unpredictable. Each Timbren spring works independently to support its side of the vehicle, cutting down on body roll and sway when turning, swerving, or hauling off-center loads. With the springs taking the weight as needed, your ride feels planted through curves while helping trailers stay in line behind you.

Illustration showing Timbren suspension reducing body roll, sway, and squat during turns or uneven loading

Illustration of truck towing trailer experiencing reduced sway with Timbren suspension enhancement system

Smooth Out Rough Roads: Rubber Springs That Absorb Shock

Bumps, dips, and uneven roads are easier to handle with Timbren’s hollow rubber springs taking the hit. Acting like shock absorbers, they cushion impacts and absorb road shock before it reaches the cab. This keeps your ride smoother when loaded and helps protect your suspension from wear by preventing bottoming out on rough surfaces.

Empty truck driving on rough road illustrating Timbren suspension shock absorption performance

Simple Bolt-On Upgrade: No Air Lines or Adjustments Needed

Installing extra load support doesn’t have to be complicated. The Timbren system bolts directly onto the frame above the rear axle using custom-fit brackets and included hardware—no drilling or air hoses required. Once installed, the springs automatically engage under load and return to normal clearance when unloaded, giving you a smooth everyday ride without gauges or manual adjustments.

Specs

Weight and Capacity

  • Load-leveling capacity: 8,600 lbs

Note

Timbren springs will not increase your vehicle's weight-carrying capacity. Do not exceed the manufacturer's recommended weight limit.

Diagram showing Timbren suspension spring installed above vehicle rear axle in loaded and unloaded positions

Warranty

  • Lifetime warranty
  • Satisfaction guarantee

FRTR350HD Timbren SES with Aeon Hollow Rubber Springs - Rear Axle

Installation Details TFRTR350HD Installation instructions

This Product Fits The Following Vehicles




Video of Timbren Suspension Enhancement System - Rear Axle
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Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.




Video Transcript for Feature Breakdown: Timbren Suspension Enhancement System-TFRTR350HD

Today. We are taking a look at the Timbren Rear Axle Suspension Enhancement Kit for your Ford Transit. Before we dive in, let's see if the suspension enhancement system is gonna be a great option for your Ford Transit. Suspension upgrade Why Adding weight, more weight, and even more weight causes rear sagging, your headlights will point up, you will get worse handling and steering, less control and less comfort. With suspension enhancement added, your ride stabilizes, it levels out your vehicle, better control and steering, headlights straighten out, reduces road shock and have a safer ride in comfort. Check out the footage that we took underneath of your Transit.

We put about 250 pounds on a cargo carrier, and as you can see, the factory bounce stops don't even hit the axle. So it does feel pretty violent in the cab. Once we have the new bounce stops installed, you notice there's a lot smaller gap between our axle and the bottom of the bounce stop. It definitely helped a lot on the test scores, so the whole entire back suspension engaged much quicker. And also the biggest improvement I saw was when we took these big wide turns and really sharp turns at a higher speed.

I didn't feel the body of the vehicle roll near as much. The bracket on top is gonna be made of steel and it has a powder coated finished, so it's not gonna really rust away over time and the bounce stop is gonna be made of rubber. But it is a hollow rubber, so it's not just gonna completely stop your axle. It's also gonna flex, even with those heavier loads you may have. If we do have a really heavy load on here and it does hit the axle, it's gonna be a lot more heavy duty than the factory bounce stop that we removed earlier.

This is not gonna increase our Transit's capacity when we're hauling, it's just going to handle those heavier loads a little bit better. So the leveling capacity of this is gonna be 8,600 pounds. It goes in the same exact spot as our factory bounce stop. All you need is a socket, maybe an extension or two, a ratchet to tighten it down. It's a very quick and easy process, so let's show you how.

First you wanna chock your front wheels. Then we want to jack up the back of our vehicle. The goal here is to get the suspension on the rear axle to sag, so we have a little bit more room to work with. And then find a solid part on your frame to put your Jack stand. Let's remove the factory hardware. All we gotta do is just pull this out like this and undo this bolt. Take a 13 millimeter socket to loosen and remove this bolt. Here's our factory hardware. So there's two different options we have with our new system. One, we can just have the metal plate here and the main bounce stop with a smaller bolt. That's a little bit bigger than the factory set up. Or we can go ahead and use this extra spacer that's included with the longer bolt to make it a little bit taller. The goal here is we want at least a half an inch to a inch and a half a gap between the bottom of this and our axle. Some usual measurements to see which one's gonna be best. This one has a height of seven and a quarter inches. And this one without the spacer has a height of six and a quarter inches. What we're doing is not using the spacers. So we're using the smaller bolt and then you want the rounded part like this to be facing up towards your frame. You definitely want to use a short socket and it's gonna be a 17 millimeter. That's just going to make sure it's not gonna fall down into the socket too much, cause we do need to catch some of these threads. Lift it up into place, line it on up and thread it down. And then we can go ahead and tighten this down all the way once it's in place. Quick little tip, one, use a shallow socket, two, if the bolt kind of falls in, even if it's just a half inch, you are gonna want to put something in there just to keep that bolt pushed up in the outside of the socket right here. So the threads are gonna be able to touch the threads on the frame. Now repeat on the other side, we can take our jack's out and we can lower our Transit down and remove the chocks. Doesn't take a whole lot of time to enhance the suspension on your Ford Transit. And that's pretty much it for a look at the Timbren Rear Axle Suspension Enhancement Kit..

Customer Satisfaction Score:

Ratings & Reviews

4.7

7324 reviews
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3 Stars
(208)
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by:
2017 Mazda MX-5 Miata
Initial feels: Definitely made my Motorhome steering more responsive, did firm up the rear a bit. Make sure to check the size of the hex on the bolts I had 1-17mm and 1-16mm
by:
Ford Transit Connect
I am very pleased with these pillows, they are better than inflatable pillows and all my friends who have a Ford Transit, on my recommendation, bought and installed them on their cars and are very satisfied!
by:
2024 ford Ranger
I LOVE my Timbrens on both of my F350’s, Ranger & Transit 350
A+
I’m no fan of leaking air bags
Brooke M. profile picture
Etrailer Expert

Brooke M.

4/1/2025

I agree with you there! There's something to be said about a product with no maintenance. Out of curiosity, because Timbrens seem to be pretty polarizing, do you use these on work trucks/vans?

by:
Excellent customer service!
by:
We purchased these for our one ton Ford Transit, which was converted by Winnebago into an RV. The springs did stabilize our ride and take away most of the vehicle roll. However, they also made the ride more bumpy. It's a trade off if you're looking for a solution to your RV riding conditions.
by:
They are awesome took the sag out of my van also lifted it about 2 inches so I don’t drag bottom when pulling in and out of my driveway .
I installed them quickly and easily!
by:
Good, very Good, no problems, better as air ride!
by:
2017 Thor Gemini Motorhome
Install was easy. Raised our Thor Gemini up as product said it would. Great job etrailer!
by:
2017 Ford Transit T350
They definitely reduced sway and lean when driving. But also seems like you really feel every bump and increase road noise?
I assume since vibration from axle can now travel directly to frame?
Might need to upgrade shocks?
Might soften liitle over time?
Might need to get softer onesv
Only have gone 80 miles with them so far.
Will give it another few hundred miles and see what feel then.

Overall pretty happy So far.

2017 Thor Gemini TX
by:
Good product
by:
helped
by:
2015 Ford Transit Connect
Good product worked well and a nice company to deal with I will deal with them again . Thank You
by:
2019 Ford Transit T350
looks great
by:
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by:
2022 F250 Super Duty. Super easy to install. I have about 3/4" gap between the spring and the plate. Time will tell how they impact the ride quality and how much sag they mitigate with my 5th wheel hooked up.
Jay S. profile picture

Jay S.

8/14/2026

Now that its been a year Im very impressed with them. Theres no ride detriment without the 5th wheel attached and they do a great job of mitigating squat

by:
It has been almost a year since I installed Timbren Suspension Enhancement Systems (DVF350 and DVR350R) on the front and rear of my 2003 Dodge RAM Van 3500. These bumpers replaced the OEM bump stops that were on my van. I like the Timbren bumpers much better than the OEM bump stops because they provide a progressively cushioned response for suspension compression when traveling over significant humps like speed bumps in a parking lot, or curb ramps into driveways. I did not like the abrupt stop the OEM bump stops provided when traveling over the same objects. I installed the Timbren rear bumpers first, and after a few months of use, I decided to add them to the front. In both cases, the front and rear Timbren bumpers were easy to install once the OEM bump stops were removed. Installation required reuse of the factory hardware. On my van, the Timbren bumpers are not always engaged. Under normal load and travel conditions the bumpers are relaxed and about 1/2” away from the suspension landing points. However, their presence is much appreciated and very noticeable when the van is carrying heavy loads or handling significant humps.
Kate F. profile picture
Etrailer Expert

Kate F.

5/6/2026

Glad to hear the Timbren systems worked out so well for your RAM Van Mitchell! It’s great that you noticed the smoother, more progressive response compared to the factory bump stops, especially under load. Thanks for sharing your experience with both the front and rear installs, that’s really helpful for others considering the upgrade. What kind of loads are you usually hauling with your van?

by:
Absolutely Pleased with the TIMBRENS. They were easy to install, and took less than an hour to install both. I noticed a slight stiffness in the ride as the rear bounced over a bad roadway. Towing is great, with a nice level and smooth ride. I am glad that I did not order the heavier duty Timbrens, than what was recomended for my truck. I believe the ride would have been too stiff. If you look at the photos showing the timbrens, the truck is still lifted in the rear, so what you see is a big gap between the rubber, and the steal plate. When the truck is lowered, there's 1" of space as it should be. BTW, I have been purchasing from etrailer for years now, and I have to say that I have never had any issues with any orders. They are my go to folks for all of my vehicle suppension stuff and trailer stuff. You can't go wrong with buying from them.
Brooke M. profile picture
Etrailer Expert

Brooke M.

5/7/2025

Wow, thank you for sticking with us, Don! That is awesome. I think you made an excellent choice here. Timbrens are tough and the heavy duty are SUPER tough. Glad to hear these were a good fit. Love the photos! Is that your own property?

Don profile picture

Don

5/21/2026

The TIMBRENs work as stated during when I am pulling anything heavy. However, when the truck is not pulling anything, anyone riding in the rear seat gets a very hard jarring jolt when driving over any roadway repairs, bumps, expansion joints on bridges. I wished that I would have went with the Super Springs, or the Road Active Suspension. I may replace the TIMBRENS later.

Gwendolyn Y. profile picture
Etrailer Expert

Gwendolyn Y.

5/21/2026

@Don I'm sorry to hear that the Timbrens didn’t pan out to be as great as you originally hoped. Swapping over to the SuperSprings or the RoadActive Suspension will definitely have less of an impact on your day-to-day driving. Out of the two, the RoadActive Suspension would have the least effect. If you ever have questions about the RoadActive Suspension or the SuperSprings, let me know and I’d be happy to help out.
by:
The timbres bump stop is exactly the right height to meet the axel when the trailer is connected with all its weight onto the hitch. I have an Andersen weight distribution hitch and it levels out perfectly. The day picture is with the coach (Winn 2100bh) with factory equipment. The night picture is after the timbres are in place. Looks good.
Lazer S. profile picture
Etrailer Expert

Lazer S.

6/16/2026

They definitely look like they are helping, Orlando! How are they when you aren't towing? We hear a lot of people say they can be pretty harsh when unloaded.

by:
Stiffens and corrects kneel in rear end of 2023 Chevy Silverado 1500. You will notice a stiffening of the rear end suspension while unloaded, but it’s a fair trade off to prevent sagging and porpoising while towing. I found it easier to pull the rear wheels and work from the side than underneath the vehicle while installing.
Kate F. profile picture
Etrailer Expert

Kate F.

7/13/2026

Bud, thank you so much for taking the time to leave a review! I'm glad to hear the suspension upgrade helped reduce the sagging and porpoising while towing. I also really appreciate you including the installation pictures and sharing your tip about removing the rear wheels. I'm sure that will help the next person tackling the install. Thanks again for choosing etrailer!

by:
Installed the Timbren TFR250SDJ on my 2025 F-250 Platinum Plus 4WD Short Bed with 6.7 HO Powerstroke. Fit perfectly. It takes a few minutes to get the bags attached to the base. It seems like the bolt is too long but I used a vise to hold the unit while I tightened it down more and cinched the bag to the base. So if it seems it wont get tight enough and is still loose, find a way to secure the base... there's still a few more turns.

Attaching to the truck takes a few minutes to remove the OEM (2 nuts) and a few minutes to install the Timbren SES. I added about 45 minutes by dropping one of the nuts, which I finally found inside the shock absorber bracket!!

I used a hand socket but would recommend air or power tools, if you can get to the nuts, but it can be done manually. Probably took me a few extra minutes with a socket wrench because of limited space, and I'm old!

I have not tested the SES under load yet, but I was really more concerned with the ride unloaded.I ended up with a gap right at 1" between the peg and bottom of the SES. Some reviews said the unloaded ride worsened. So I drove to the nearest small town with horrible streets, bumps, holes, broken concrete, sewer covers 3" below the asphalt, etc. On the highway, the ride was perfect, completely unaffected. On my bad road obstacle course, I thought the ride improved significantly. So I think the system will give a better ride unloaded. It was a little stiffer, less roll, and smoother. It was not "bouncy" or jarring, like some reviews mention. Very smooth and felt beefier on bad roads.

I'll update after I've driven loaded. I tow a 12,000# 2025 Rockwood TT 36' with a ProPride 3P hitch. We put 7,000 miles on it across 15 states this past year, so I've definitely got a "before" baseline using the OEM bumpers.

The ordering process was great. Naomi D had great product knowledge. At first I thought I was talking to my granddaughter, but after putting her through the paces, It felt like I was getting sage advice from my Grandfather. e-Trailer seems to really invest in their customer service reps knowledge base. Also completely satisfied with the order process and delivery. They were able to mail to our PO Box, which seems to be a problem for most (our physical address is a gate on the side of a highway, with cows on the other side).

100% satisfied so far and would recommend both e-trailer and Timbren to a friend. Will update once I've done some towing, but can say the unloaded ride is unaffected or improved for my application. So far, very happy.
Robin H. profile picture
Etrailer Expert

Robin H.

9/22/2026

Thanks for taking the time to share such a detailed review and all of the pictures! The unloaded ride is a concern we hear fairly often with SES upgrades, so your experience with the 1" gap and rough-road testing will be really helpful to others considering these for their F-250. We appreciate the kind words about Naomi and our team as well. Looking forward to your update once you get some miles on them with the Rockwood!

by:
A very simple and straightforward installation once you get the oem bumper stops off (had a shop do that)
Timbren worked with me as I had a non OEM frame height (vehicle was lower than stock) to recommend the proper kit. Highly recommend contacting timbren if you are unsure of the proper kit to use. Ride is more stable. It does feel stiffer and less bouncy but am looking forward to seeing how it performs with my truck camper. Truck is a 1998 dodge ram 2500. Brake line over left side of axle needed to be secured to prevent damage.
Heather A. profile picture
Etrailer Expert

Heather A.

4/24/2026

Hi there, thanks for reaching out, that’s actually a common issue with this type of trim. The one you tried is a standard flat insert, but some RVs (like your NOBO) use a slightly domed trim to help it sit over the screw heads in the track. If the screws stick up even a little, a flat trim won’t fully snap in place, which sounds like what you’re running into. The best way to find the right replacement is to remove a small piece of your original trim, lay it flat, and measure the full width from edge to edge. Most are either 3/4" or 1", but the shape matters too, not just the width. If yours has that domed profile, you’ll want something similar or a softer vinyl that can flex over the screws. If you’re able to send a quick photo of your track or old trim, I’d be happy to help you find a better match.

by:
2001 toyota Tacoma
Well they are exactly what I thought it would be. Hard for me to say it's what I needed yet.
I installed them on a homemade trailer from a salvaged 2001 base model tacoma. Once I get finished building it out and have some weight in it I'll have a better idea. But from what I've seen so far on a couple test drives they should come into effect when needed.
For reference I building an Tacoma based trailer with an ARE Contractor topper with a Naturnest roof top tent on the very top. So to counter and sway these should be very helpful. At least I hope so. I'm not an engineer but I did stay at an Holliday Inn once.
Mike L. profile picture
Etrailer Expert

Mike L.

4/23/2026

Niiiice, I see what you did there!! That looks like a sweet setup!

Mike L. profile picture
Etrailer Expert

Mike L.

4/23/2026

@Bill That's outstanding, good job!!
by:
2025 Chevrolet Silverado 2500
The Timbren SES is a simple solution for rear squat when towing. When hitched to my 30' Airstream Globetrotter (8800 GVWR) with a tongue weight around 1200 lbs, my Silverado 2500HD had a bit more squat than is ideal. I shopped airbags but didn't want to spend ~$2K for the set up and didn't want the hassle of installation and forever chasing air leaks. The Timbren SES literally installs on the Silverado in about 15 minutes. So simple. No bags, no compressor, no wiring, no air lines, no leaks. And WAY less expensive to boot. Just returned form a 600+ mile trip and it towed flawlessly.
Mike L. profile picture
Etrailer Expert

Mike L.

4/2/2026

Glad to hear they worked well for you Jerrod. Hope you had a good trip!

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See what our Experts say about this Timbren Vehicle Suspension

  • Best Timbren Kit for a 2019 Ford Transit T350 Motorhome Chassis
    The best Timbren kit for your 2019 Ford Transit T350 motorhome chassis is part # TFRTR350 rated for 5,600 lbs. The other kit # TFRTR350HD you referenced is rated for 8,600 lbs and designed around vehicles with heavy-duty applications like a service vehicle. The standard kit will give you the best ride quality which is why I recommend going that route. If you were to use the heavier rated kit then the ride quality would be very harsh and you wouldn't enjoy driving your motorhome around.
    view full answer...
  • Recommended Suspension Support to Address Sway on a 2020 Leisure Travel Wonder Motorhome
    Hey Anker. I recommend starting with the Timbren Suspension Enhancement System item # TFRTR350HD and seeing how that addresses the sway you're feeling on your 2020 Leisure Travel Wonder Motorhome. If you had a top overhang I would say tackle the front and the rear end at the same time. The Timbrens are going to prop up any squatting you're encountering and help with any top heavy feeling you're getting when you make turns. We don't have a set of Timbrens for the front end of your 2020...
    view full answer...
  • Timbren Suspension Enhancement For A 2024 Ford Transit 350 HD High Roof Passenger Van
    Hello Ronald. It sounds like you are on the right track here because the Timbren Suspension Enhancement System - Rear Axle Item # TFRTR350HD is going to be the best choice for your 2024 Ford Transit 350 HD High Roof Passenger Van. These are rated for 8,600 lbs which is considered heavy-duty and is recommended especially for dually high roof models.
    view full answer...
  • Rear Suspension Enhancement Option for a 2017 Ford Transit T350 Dually
    I do have a rear suspension enhancement option that will work with your 2017 Ford Transit T350 but as you mentioned, the Air Lift LoadLifter 5000 Air Helper Springs part # AL57213 will not work on models equipped with dual rear wheels. For a similar type of suspension enhancement that will fit your T350 with dual rear wheels, I recommend using the Timbren Suspension Enhancement System part # TFRTR350HD. The Timbren Suspension Enhancement System will act as a buffer between your frame and...
    view full answer...

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