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Timbren Suspension Enhancement System - Severe Service - Rear Axle
(966 reviews)
Price: $269.36
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Timbren Suspension Enhancement System - Severe Service - Rear Axle
Part Number: TFRTT1504E
In Stock
$269.36
Retail:$316.90
You Save: $47.54
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Timbren Vehicle Suspension - TFRTT1504E
Highlights
- Custom Fit for Your Vehicle: Mounts to existing attachment points
- 14,000-lb Load Support: Keeps your truck level and stable when hauling heavy gear or equipment.
- Improved Steering and Braking: Reduces rear sag so handling and headlight aim stay consistent.
- Smoother Ride on Rough Roads: Hollow rubber springs absorb shock to minimize bounce and bottoming out.
- Independent Side-to-Side Support: Helps balance uneven loads and reduce body roll in turns.
- No-Drill Installation: Bolts directly to the frame with custom brackets for simple setup and lasting fit.
Features to know about
Stay Level When the Weight Piles On: 7,000-lb Hollow Rubber Springs
Heavy loads in the bed or towing can make the rear sag and the front lift, throwing off handling and braking. This Severe Service Timbren Suspension Enhancement System uses 7,000-lb capacity hollow rubber springs that sit above the rear axle to keep your vehicle level under weight. The springs work with your factory suspension to resist squat and stabilize the ride so steering and braking stay predictable when hauling serious cargo or towing heavy gear.
Handle the Rough Stuff: Progressive Rubber Design Absorbs Shock
Rough roads and big bumps can punish your suspension when loaded. The hollow Aeon rubber springs compress along their folds for a soft initial response, then stiffen as load increases. That progressive action cushions light loads for comfort while getting firmer when you’re hauling heavy to prevent bottoming out and extend suspension life. The rubber construction also soaks up road shock, keeping the ride controlled no matter what’s in the bed.
Stay Balanced and Confident: Independent Side-to-Side Support
Off-center loads or quick lane changes can make a truck lean or sway. Each Timbren spring works independently, kicking in only when that side needs support. This helps reduce body roll in turns and keeps things level when carrying uneven loads. With better stability through corners and less sway when towing, your setup feels planted and easier to control.
Keep It Simple: Bolt-On Installation with No Drilling
Adding extra suspension support shouldn’t be complicated. The kit includes two Aeon hollow rubber springs, custom-fit brackets, and mounting hardware for a straightforward bolt-on install—no drilling required. Once mounted, there are no airlines, compressors, or adjustments to worry about. It’s a set-and-forget system built to deliver consistent support and a lifetime of dependable service under load.
Specs
Weight and Capacity
- Load-leveling capacity: 14,000 lbs
Note
- Timbren springs will not increase your vehicle's weight-carrying capacity. Do not exceed the manufacturer's recommended weight limit.
- Lifetime warranty
- Satisfaction guarantee
FRTT1504E Timbren SES with Aeon Hollow Rubber Springs - Rear Axle - Severe Service
This Product Fits The Following Vehicles
- 2015 - 2027 Ford F-150 2 Wheel Drive
- 2015 - 2027 Ford F-150 4 Wheel Drive
Customer Satisfaction Score:
90% were satisfied with this product
10% of customers were not satisfied
- Arrived Damaged
- Product did not meet expectations
- Wrong item was ordered
Ratings & Reviews
4.5
966 reviews
by:
Mike
06/30/2026
The severe duty part does not integrate with a pre-installed RAS system. It interferes with the inner bracket straddling the axle. Found this out the hard way. Will see if I can replace it with the lighter duty Timbren.
by:
Gary
07/03/2020
2016
Ford
F-150
The Timbren rubber spring was ordered, delivered and installed in June 2020. It was installed on a 2016 F150 two-wheel drive. The vehicle has stock suspension – no lift kits or leveler kits.
I found that the nuts and bolts were loose in the box. The plastic bag containing them was open at the top. Fortunately, none of the nuts or bolts had fallen out of the hole in the box.
For the install, I jacked the back of the truck up and took the rear tires off. I was able to install most parts from the side. I found this easier than crawling under the truck. The install went smoothly and took about one hour – including time to remove and replace the wheels. Of the three different nuts and bolts used during the install, torque requirements were provided only for one nut. I guess the two bolts are not critical.
The part came with a 1” rubber spacer. The instructions say that the gap between the rubber spring and the contact point should be between ½” and 1 ½”. As installed, the gap was ½ “ - at the bottom of the manufacturer’s guideline. When I drove the truck around, I could feel the rubber spring bottoming out as I drove over normal road bumps and I didn’t like this hard ride.
So I removed the spacer. The gap is now 1 ½ ” – at the top of the manufacturer’s guidelines. But the empty ride is so much better. Of course, the rubber spring when loaded, is less compressed and there is naturally more stress on the leaf springs. This is the situation that the rubber spring was supposed to fix.
It seems that the install would have been better with either a ¼” or ½” spacer. I would think the optimum installation would be a gap measurement near the mid-point of the gap range. The ½” spacer would be close to this point and should have been the spacer supplied but apparently that is not what is specified for Ford trucks. The 1” spacer is basically useless.
I found that the nuts and bolts were loose in the box. The plastic bag containing them was open at the top. Fortunately, none of the nuts or bolts had fallen out of the hole in the box.
For the install, I jacked the back of the truck up and took the rear tires off. I was able to install most parts from the side. I found this easier than crawling under the truck. The install went smoothly and took about one hour – including time to remove and replace the wheels. Of the three different nuts and bolts used during the install, torque requirements were provided only for one nut. I guess the two bolts are not critical.
The part came with a 1” rubber spacer. The instructions say that the gap between the rubber spring and the contact point should be between ½” and 1 ½”. As installed, the gap was ½ “ - at the bottom of the manufacturer’s guideline. When I drove the truck around, I could feel the rubber spring bottoming out as I drove over normal road bumps and I didn’t like this hard ride.
So I removed the spacer. The gap is now 1 ½ ” – at the top of the manufacturer’s guidelines. But the empty ride is so much better. Of course, the rubber spring when loaded, is less compressed and there is naturally more stress on the leaf springs. This is the situation that the rubber spring was supposed to fix.
It seems that the install would have been better with either a ¼” or ½” spacer. I would think the optimum installation would be a gap measurement near the mid-point of the gap range. The ½” spacer would be close to this point and should have been the spacer supplied but apparently that is not what is specified for Ford trucks. The 1” spacer is basically useless.
by:
Michael
07/14/2025
Easy to install. Quality product
by:
Robert
05/18/2026
The install was straight forward and simple, just make sure you keep the gap correct and it will ride fantastic
by:
Roger
04/07/2020
2017
Ford
F-150
Went onto 2017 F-150 very easily. I just jacked up the rear bumper a little and to drop the axle a bit, and everything fit well. Took me about 1.5-2 hours to complete.
Roger
4/8/2021
All good except when I dont have a load the ride is VERY stiff.
by:
Robert
10/05/2021
Straight forward and quick installation. Being paired with the Torklift stableloads for a truck camper on an F150. Helped tremendously with the load stability.
by:
Adam P.
07/06/2018
2015
Ford
F-150
Simple install and works very well on my 2015 F150 4x4. The truck feels way more solid while towing and you don't notice the Timbrens while the truck is unloaded unless on a really bumpy road. Overall great product for the price!
by:
Jeff
01/04/2025
2022
Ford
F-150
I tow a RZR in a covered trailer just under 5K, including tools and supplies. Just bought this 2022 F150 and there was a slight amount of sag when pulling the trailer. I decided to try the Timbrens hoping they would not stiffen the normal ride. They work as advertised-us9ing the spacer. Easy install too.
Victoria H.
1/4/2025
Those RZRs are so much fun Jeff, and I'm so glad we could help improve the ride quality while towing it for your new F150!
Jeffrey S.
1/5/2026
The Timbrens did just what I wantedadded enough extra stiffness when hauling my side by side in its enclosed trailer. They were easy to install and I used the spacer on my F-150. Trailer is just short of 4500 pounds.
by:
Cathrine
04/22/2026
Easy to install. Can’t wait to check them out on our next camping trip.
by:
Bert Lee
10/28/2023
Excellent product. Easy to install and it’s a great price! It drastically improved my truck from squatting when a trailer is attached.
by:
Statler
06/19/2022
Installation was easy. Haven’t had load put on them yet.
by:
Gerry G
06/10/2019
Ford
Five Hundred
Functionally these Timbren Rubber Springs provide additional load capacity and reduce tipping while turning around corners on my F-150 as claimed; however, the set I purchased was overly stiff (I was only hauling 500 additional pounds). Timbren provided a replacement set with lower capacity which helped tremendously; however, it still rides slightly stiff. I wish Timbren or a competitor would provide these rubber springs in different durometers that provide 1000 lb increments to fine tune the suspension - reducing the over stiffness performance.
Gerard G.
6/11/2020
The ride is still too stiff for my preference. I continue to be on the lookout for incremental rubber durometer springs that enable fine tuning suspensions.
by:
Francis
08/14/2021
2016
Ford
F-150
Very happy with these. Easy to install. They're simple and provide good handling and just a little lift with the camper installed. Much better than the Firestone Riderite airsprings which I had to replace (defective design at least for the 2016 F150 truck).
Francis W.
8/21/2022
Still very happy with Timbren springs. No signs of any wear and still performing very well.
by:
Craig
08/10/2022
2019
Ford
F-150
These are a much better ride quality than the last pair I owned on a 1 ton truck. Unloaded ride quality is not affected by the Timbren as there is a 1.5" gap. When loaded they provide excellent side to side stability with only gaining an inch height at the rear fender over the factory bump stops when loaded. Very level. Thank you etrailer.
Craig
8/12/2023
After around 10k mi. they still assist when the load demands it. When unloaded the truck drives nearly as smooth as a car.
by:
Jack
09/01/2025
ford
F-150
They are working well on my 2024 f150 hauling truck bed camper much improved ride
by:
Robert
02/25/2026
AWESOME THANK YOU VERY MUCH
by:
Henry
10/07/2022
2022
Ford
F-150
I have a 2022 F150 crew cab with the heavy duty payload package (2800lb payload). I called Timbren and they advised to only use the 7000lbs springs for my truck camper which puts me at GVWR when loaded.
The ride is brutal. There is almost no suspension compliance. The ride would probably be better if I was using more of the 7k lb capacity, but then I’d be overloaded.
I don’t understand why this product exists. Any F150 to make use of such extreme support would be grossly overloaded. I ended up using a more expensive solution from a different manufacturer.
The ride is brutal. There is almost no suspension compliance. The ride would probably be better if I was using more of the 7k lb capacity, but then I’d be overloaded.
I don’t understand why this product exists. Any F150 to make use of such extreme support would be grossly overloaded. I ended up using a more expensive solution from a different manufacturer.
by:
Matt
09/16/2018
I owned these for about a year and just recently switched to air bags instead. While the Timbren spring helped level the truck under load, there were other things that I was not satisfied with. One issue was the amount of distance the truck would drop until the Timbren would engage, I would have like to see them take affect sooner. I did not like the ride while empty. When hitting a decent size bump in the road the spring would slam into the stop causing for a very jolting ride. Also while under load and the Timbren was engaged, it made the truck extremely bouncy. Again it did stop the truck from further squatting under heavy load, but the other factors were what made me switch out for air bags, to which I have been very happy with.
by:
John
07/08/2025
2023
Ford
F-150
Installation was easy
by:
Ken
05/07/2020
Chevrolet
Colorado
The product does what I bought it for which was to stabilize the ride when I was towing our 23 foot travel trailer. I was experiencing a bouncing floating sensation when towing the trailer before, after having the product installed and tested by hauling the trailer around Colorado last year I was happy with the results. The only complaint I have is that when I'm not hauling something there is not enough clearance between the product and the axle, which results in a rough ride when I go over even a small bump. I believe if I were to stop hauling the trailer I would definitely have the product removed.
by:
MPINFL
07/01/2017
2017
Ford
F-150
This is the second time I purchase and install these, the first was for my 2013 F150 and now on my 2017 F150.
I towed my 9600lb bumper pull RV with the new 2017 truck before i ordered this second set, just to see if i noticed the difference. I loved the last set but heck, life is about experiences right? Those of you who have these are laughing right now as you know what I'm going to say. HUGE difference, noticed the absence right away. Got home from that camping trip, straight on my computer to order this latest set.
As far as I'm concerned this is the best $200 bucks you'll spend. You have extra cushion when it matters most and it doesn't affect your ride at all when you don't. They are very easily to install and you don't have all the extra equipment etc as with an airbag system.
I'm not the kind of guy who works on his truck, I don't consider myself mechanical at all yet i didn't have any problems with the installation.
The only "issue" i had was when attaching the stop bumper to the metal mount. The screw is just long enough so i could get the tension i needed to get it threaded (the head of the bolt would drop slightly within the socket). I was able to get it threaded by using my index finger to hold the bolt and my ring finger to turn it, just enough to get it started. After that I was fine. As i mentioned, I'm not mechanical so my tool options were limited. Just bring some patience with you and you'll be fine. The instructions are good.
As long as I'll be towing a camper, I'll have a set of these on every truck I own.
I towed my 9600lb bumper pull RV with the new 2017 truck before i ordered this second set, just to see if i noticed the difference. I loved the last set but heck, life is about experiences right? Those of you who have these are laughing right now as you know what I'm going to say. HUGE difference, noticed the absence right away. Got home from that camping trip, straight on my computer to order this latest set.
As far as I'm concerned this is the best $200 bucks you'll spend. You have extra cushion when it matters most and it doesn't affect your ride at all when you don't. They are very easily to install and you don't have all the extra equipment etc as with an airbag system.
I'm not the kind of guy who works on his truck, I don't consider myself mechanical at all yet i didn't have any problems with the installation.
The only "issue" i had was when attaching the stop bumper to the metal mount. The screw is just long enough so i could get the tension i needed to get it threaded (the head of the bolt would drop slightly within the socket). I was able to get it threaded by using my index finger to hold the bolt and my ring finger to turn it, just enough to get it started. After that I was fine. As i mentioned, I'm not mechanical so my tool options were limited. Just bring some patience with you and you'll be fine. The instructions are good.
As long as I'll be towing a camper, I'll have a set of these on every truck I own.
by:
James
07/02/2022
ALthough these worked great when the trailer was attached, they created a "too stiff" suspension when the trailer was not attached.
Brooke M.
7/7/2022
I would recommend air bags to solve this problem. Part # F2582 is rear axle suspension like what you got but these are adjustable so that when your truck is not loaded up you can deflate them so that it is not such a stiff ride when you do not need them.
by:
Recy
01/07/2023
It works well, but I ordered the 7000 lbs version by mistake, so I get the abrupt "stop" when axle meets the timbren while unloaded. They work well enough that I don't need my Curt WDH to move from storage to home. I just use an old equalizer head unit and the sway control if I need to go on the interstate.
by:
Kelly
07/20/2023
Nissan
Leaf
We bought these because we are buying a truck bed camper. We have a 23 4x4 F150. The fit of the bottom plate on the driver side was a bit too tight between the leaf block and some wiring mounted on the axle. We trimmed the plate a little so it fit better.
I saw some reviews that said the unloaded right was stiff. We haven’t noticed anything like that. We just hauled a load of firewood off a steep mountain road and the load felt really stable with the timbrens.
Happy with these so far!
I saw some reviews that said the unloaded right was stiff. We haven’t noticed anything like that. We just hauled a load of firewood off a steep mountain road and the load felt really stable with the timbrens.
Happy with these so far!
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view full answer... - Type of Wrench Needed to Install Timbren TFRTT1504E Suspension Enhancement Springs on 2017 Ford F150Because the bolt holding the factory bump stop and the bolt provide with the new Timbren # TFRTT1504E Aeon spring is countersunk, you will indeed need a 13mm ratchet with a 6 or so inch extension to remove the existing bump stop and install the new Timbren spring. It couldn't be done with a standard wrench. I've linked to an insallation video that would walk you through the whole process.
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view full answer... - Setting a Weight Distribution System On 2018 Ford F-150 with In-Bed CamperThe weight of the cargo in the truck bed behind the axle will get factored into a weight distribution system so you will want to set the system with the truck loaded. That said, you'll likely want to consider extra support for an in-bed camper, the Timbren Suspension Enhancement System part # TFRTT1504E is designed for this exact purpose. You then might want to consider a higher rated weight distribution system to account for the extra weight but since there isn't exact an exact formula...
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