bing tracking image
  1. Vehicle Suspension
  2. Timbren
  3. Jounce-Style Springs
  4. Rear Axle Suspension Enhancement
  5. Extra Heavy Duty
Timbren Suspension Enhancement System - Rear Axle
Save 30% on Timbren Suspension Enhancement Systems & Active Off-Road Bumpstops

Timbren Suspension Enhancement System - Rear Axle

lowest price pledge
Our Price: $252.45
You Save: $44.55
Vehicle Suspension

Will this fit?

To see if this custom-fit item will work for you please tell us what vehicle you'll use it with.

This item qualifies for Free Shipping
Shipping Weight: 9 lbs
In Stock
Instant Rebate
zoom in icon
slider vertical icon
zoom out icon
Comment field cannot be left empty.
Name field cannot be left empty.

Thank you! Your comment has been submitted successfully. You should be able to view your question/comment here within a few days.

Error submitting comment. Please try again momentarily.

Product Images

Customer Photos

Need help with installation?
Locate installers near me
6,000-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. Lowest Prices for the best vehicle suspension from Timbren. Timbren Suspension Enhancement System - Rear Axle part number TNRTTNA can be ordered online at or call 1-833-496-1390 for expert service.
  • All Info
  • Reviews (4519)
  • Q & A (0)
  • Photos
  • Why etrailer?

Timbren Vehicle Suspension - TNRTTNA

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

6,000-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 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


  • Load-leveling capacity: 6,000 lbs
    • Timbren springs will not increase your vehicle's weight-carrying capacity. Do not exceed the manufacturer's recommended weight limit
  • 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.

NRTTNA Timbren SES with Aeon Hollow Rubber Springs - Rear Axle - 6,000 lbs

Installation Details TNRTTNA Installation instructions

This Product Fits The Following Vehicles

Customer Reviews

Timbren Suspension Enhancement System - Rear Axle - TNRTTNA

Average Customer Rating:  4.7 out of 5 stars   (4519 Customer Reviews)

6,000-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.


I debated for awhile weather or not to get this product or air bags. I chose this product for its value and high reveiws. I also like that it is maintenance free and lifetime reveiws. There is really nothing to go wrong except for the brackets to possibly someday get rusted. But the brakets seem to have a powder coat or really good paint. I installed these my self. Can be installed in a couple hours on a newer truck that has rust free u bolts. Just take the wheels off and jack the truck up and loosen u bolts and remove old bump stops and install the Timbren helper springs. I thought the hardest part was re torque the u bolts. The package I got had a one inch spacer which I installed. It made my helper springs about 3/4 inch below the bump stop. If I hit a good bump on the road I can feel them bottom out a little. Bit nothing that would change my mind about putting them on. I pulled my dump trailer since I put them on and it made a world of a difference. Very little squat and gave the truck a nice firm ride. I would recommend these to anyone that has a tight budget and wants a safer driving experience.

Best thing for the money. Would buy them again. The only thing I would try next time is getting a bigger spacer from the factory so there is little to no gap between the frame and the rubber spring. I only had a little over a half an inc but by the time I put my camper on the truck look like it is starting to square.
David W - 05/14/2020

2017 Nissan Titan XD

1st. Easy to install. Definitely solved my sagging issue affordable.
I have a decked tool box in my titan xd and pull a 24' enclosed cargo trailer. From the original bumpers, I seen I have bottomed out. With trailer on now, it might have dropped 1". 90% better then before. Definitely a no Brainer if anyone ever ask me what to do. I would recommend!


Very easy installation, they work great keep my truck and trailer sitting level

2017 Nissan Titan

I install these on a 2017 Nissan Titan XD it took about 45 minutes to install both sides this is a very easy installation just follow the instructions. We tow a 35 ft 5th wheeler during acceleration the front end of are truck would Lift up this has solved the problem.


These are the hardest ride you could possibly get loaded or unloaded I would not recomend timbrens to anyone. Had to eat the cost and replace them with air bags. (Aweful product)

I will have our customer service team reach out to you. Timben does offer a 60 day money back guarantee.
-- Etrailer Expert Jenny N - 02/11/2022


Installed quickly and easy.
buy from Etrailer again.


Better than airbags! Easy install. Took 15 minutes to install. Don’t even have to jack truck up. Loosen u-bolts and slide stock one out, slide timbren in and tighten nuts!


I have been running the Timbren’s on my Titan XD for almost a year. The reason I installed them was to get a more level stance when towing my 5th wheel camper with a Pin weight off 1600lbs. With the Timbren’s install I have a dead level truck. With them installed it only squats another inch. The control and ride is very good with Timbren. I didn’t not install the spacer so my empty ride is not effected. I would recommend this product.

Install took 20 minutes with normal hand tools and a TQ wrench.

2016 Nissan Titan XD

Fast delivery, easy install on 2016 Nissan TitanXD, so far so good.

Over a year, and several heavy loads later, these Timbrens are still going strong. Easily the best addition to the truck and at the lowest cost.
Tom - 08/11/2019


Put these on when I purchased a 5th wheel. Provides excellent control of truck, no sway or bobbing and no sag. Smooth safe towing
Just be sure you have the minimum 1/2" clearance or when truck is not under load you will feel the truck hit the bump stops causing a bit of a firmer ride.
I had to remove the spacer to gain enough clearance between bump stop and frame.


No hassle, no maintenance, there when you need them.


I had considered getting air shocks for the rear of my truck when I pull the fifth wheel. I didn’t want to pay the price for that so I thought I’d try these and if it wasn’t helpful I’d get the air shocks. After putting them on it was obvious I didn’t need anything else. They easily handled the load and work well under all conditions. A much cheaper option compared to air shocks!


The product arrived two days early with the package still intact. I am not a mechanic, but hack my way around vehicles and I must say this was extremely easy to install. Thank you Timbren!!
Looking forward to using our gooseneck dump trailer and fifth wheel camper, experiencing less dip in the bed of the truck. Again, thank you.


Great product at the right price. Really helps when towing or with a heavy load in the back. Installation was quick and easy.


I bought these about one year ago for my truck and have been very happy with them. They were super easy to install and they work great when I tow my fifth wheel (the truck rides actually better when towing). Time will tell how well the high density rubber holds up.

2018 Nissan Titan

Kind of sceptical about these at first. Put them on our 2018 Titan xd diesel. We pull our 30 ft travel trailer every weekend. And these absolutely made the ride of the ride so much better when loaded. Doesn't affect unloaded ride at all. I definitely recommend buying these for your tow vehicle!!!


Makes a huge difference in carrying heavy loads. I could tell an immediate difference when I had a full bed, gooseneck load, or a bumper pull load. Highly recommended. I considered air suspension, but did not want to tackle that installation. Literally can install this with a torque wrench and impact wrench.


I purchased this because I tow a 9000lb travel trailer. This made a big difference.


Kit made it here earlier than expected. Bump stops were easy to install and fit perfect. Test drove unloaded, so will finish review following a haul of our 5th wheel trailer.

Customer service at etrailer is exceptional!

2017 Nissan Titan

Installed on my 2017 Nissan Titan SV.
install and maybe took 1 hour. Didn’t know that on Medium and Heavy Duty Trucks that it is in constant contact. Did affect ride some but not horrible. I do tow a camper and a 27 foot pontoon often ,so I’m excited to see how it does.
I can tell there is no lean going into curves and the truck does handle better.

2016 Nissan Titan xD

the product was shipped quickly and installation was easy and straightforward and fitment was perfect. haven't towed with it installed yet but will be in about 9 days (24' enclosed car trailer about 9k lbs). I'm confident that it will squat much less and be even more stable and comfortable towing.

2017 Nissan Titan

Great product, quality is far more than I expected. The density of the material is hard enough to keep the truck from bouncing with a heavy load, but soft enough to maintain a smooth ride.

Love these Spring enhancers


So far so good. Very easy to install. Can’t wait to hook up my 5th wheel and see what kind of difference it makes. Was delivered quickly and very easy to install.


Exactly what I needed, easy to install. Very fast delivery as always.

2017 Nissan Titan XD

Took a while to get here, but still excited to install

Show More Reviews

See what our Experts say about this Timbren Vehicle Suspension

  • Total Height of Timbren Suspension kit part # TNRTTNA
    The total assembled height of the Timbren kit part # TNRTTNA is 8-7/16 inches.
    view full answer...
    Image 1 for
  • Timbren Springs or Air Bags for 2016 Nissan Titan XD Pulling 5th Wheel Trailer
    For the type of weight that a 5th wheel trailer will be putting on the rear axle of your 2016 Nissan Titan XD I like the capacity and durability of the Timbren Jounce-Style Springs # TNRTTNA. Unlike air springs these also won't require any adjustments or maintenance after the initial installation so you can simply hook a trailer up, load the bed up, or head out on a Sunday drive without having to worry about making the appropriate adjustments on the springs. It also looks like all of...
    view full answer...
  • Does Installation of TNRTTNA on 2018 Nissan Titan xD Require Removal of Axle U Bolts
    When installing the Timbren # TNRTTNA you should only need to loosen the axle U-bolts, and not completely remove them. I can't say that it would be the worst idea to replace a bolt that was likely torqued to install, but it's not something we carry. Most likely these would be specific to your 2018 Nissan Titan xD so you would need to source those from an auto parts store or your Nissan dealer. From what I was able to find from my research it looks like those bolts are designed to be torqued...
    view full answer...
  • Can I use the RoadActive Suspension Kit With The Timbren Rubber Springs?
    Since the RoadActive Suspension Custom Leaf Spring Enhancement Kit # RAS3611 uses a different mounting system then the Timbren Suspension Enhancement System # TNRTTNA you will be able to mount both of them on your 2018 Nissan Titan XD. You may need to temporarily loosen and possibly remove the RoadActive system from the mount on the U-bolts to install the Timbren Springs below the U-bolts on the leaf springs. Remember these systems will not increase your maximum payload or towing. They...
    view full answer...
  • Will Timbrens Cause Pogoing On a 2017 Nissan Titan XD
    The Timbren Suspension Enhancement System part # TNRTTNA is a great option for a 2017 Nissan Titan XD. It should engage fully with that amount of tongue weight so there should not be any pogoing but then again, this is not something that we can really arcuately predict. In order to provide support you must stiffen the suspension so a decrease in ride quality in inevitable. If you are concerned with pogoing, the best option would be something that engages right away like air bags, the Air...
    view full answer...
  • Rear Suspension Enhancement Kit Recommendation for 2017 Nissan Titan XD 2WD
    I am looking at their online fitguide and they call out the fit of the part # TNRTTNA for your 2017 Nissan Titan XD if it is a 4 wheel drive which also matches the fit info they gave us when we listed this part number as a fit for your truck. Since you have a 2 wheel drive truck a much better option that is a confirmed fit is the # RAS3611. With this kit you get better support than the Timbren plus a better ride quality overall.
    view full answer...
  • Will the Timbren Suspension Enhancement System Fit a 2016 Nissan Titan XD with 3 Inch Lift
    Yes, you can install the Timbren Suspension Enhancement System part # TNRTTNA on your 2016 Nissan Titan XD with a 3" lift. However, you need to also install multiple Timbren Spacers part # A25723-90AH00 equal to the height of your actual lift in order to compensate for this.
    view full answer...

Do you have a question about this Vehicle Suspension?

  • Why

    At we guarantee:
  • Highest quality vehicle suspension for the best price.

    Our Lowest Price Pledge ensures you will never overpay for the parts you need.
  • Real product know-how.

    We make sure that the products we sell are what we say they are, and that they work the way they are supposed to work. Get real advice from a real person who has the knowledge and expertise needed to solve your problem.
  • Most detailed, accurate vehicle suspension information available.

    Because we take providing accurate product information seriously, we take our own detailed product photos, demo videos and installation videos, as well as verify measurements, instructions, and vehicle fit information.
  • Installations, made easy.

    We love helping people and have the most highly-trained customer service, hands-on experience, step by step videos and installation instructions.
  • Fast shipping.

    Your order is automatically routed to get out of our warehouse and to your door as quickly as possible. Receive free shipping on orders over $99.
  • Personalized service for life.

    We provide one-on-one, personalized service from the ordering process through the life of your product.
  • Trusted since 1946.

    We've been serving customers since our parts store first opened in 1946 and continue to be recognized by our customers, our vendors and third parties for exceptional service.
  • Returns Policy

    Need to return an item? No problem. Please read our Returns Policy for more information.

Info for this part was:

Employee Leah B
Edited by:
Leah B
Employee Jameson C
Expert Research:
Jameson C
Employee Jacob T
Video Edited:
Jacob T
Employee Cole B
Installed by:
Cole B
Employee Robert C
Installed by:
Robert C
Employee Mary E
Updated by:
Mary E
Employee Wilson B
Updated by:
Wilson B
Employee Carrie F
Updated by:
Carrie F
Employee Jonathan Y
Video by:
Jonathan Y
Employee Anna W
Written by:
Anna W

At we provide the best information available about the products we sell. We take the quality of our information seriously so that you can get the right part the first time. Let us know if anything is missing or if you have any questions.

Product Experts Available Now!
Call 1-833-496-1390