bing tracking image
  1. Vehicle Suspension
  2. Timbren
  3. Jounce-Style Springs
  4. Rear Axle Suspension Enhancement
  5. Standard Duty
Timbren Rear Suspension Enhancement System
Timbren

Timbren Rear Suspension Enhancement System

Part Number: TJRJK
In Stock
$269.36
Retail:$316.90
You Save: $47.54
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.

Add to cart
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

In Use/Installed

Customer Photos

2,400-lb Capacity. These hollow rubber springs sit above the rear axle to help stabilize and level your vehicle. They also provide a more comfortable ride by absorbing road shock and improving roll stability. Easy to install and use. Great Prices for the best vehicle suspension from Timbren. Timbren Rear Suspension Enhancement System part number TJRJK can be ordered online at etrailer.com or call 1-800-940-8924 for expert service.
  • All Info
  • Reviews (6505)
  • Q & A (0)
  • Photos

Timbren Vehicle Suspension - TJRJK

  • Jounce-Style Springs
  • Rear Axle Suspension Enhancement
  • Timbren
  • Standard Duty

2,400-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
      • Increases stability - providing great performance while hauling heavy loads
      • Reduces vehicle sag
  • Works independently - side-to-side
    • Helps compensate for off-center loads
    • Reduces body roll when swerving and turning corners
  • Acts as shock absorbers, taking the brunt of bumps and rough roads
    • Extends the life of your vehicle's suspension


Specs:

  • Includes: 2 Aeon hollow rubber springs and vehicle-specific hardware for simple installation
    • Replaces axle bump stops on frame
    • No drilling required
  • Capacity: 2,400 lbs
    • Do not exceed the vehicle's weight-carrying capacity
  • Designed to work with a suspension system that is in good working order
  • Limited lifetime warranty - satisfaction guarantee


An example of sag on a vehicle's rear axle under a heavy load

Whether you're hauling heavy loads in your bed or cargo area or you're towing a trailer, you will often see the rear of your vehicle sag while the front end rises. In these cases, the rear axle is handling not only the weight of the cargo, but also more of the vehicle's weight. Because less weight is on the front axle, the front tires are making less contact with the road. Overall handling - traction, steering, and braking - is negatively affected. But the resistance from Timbren's Suspension Enhancement System works with your factory suspension to keep your vehicle level and improve your driving experience.


Diagram of the Timbren spring installed

The Timbren system comes with custom-fit brackets that are bolted onto each frame rail above the rear axle. Hollow rubber springs are bolted to the bottom of the bracket and hang down to where the bottom of the spring sits, 1" above the axle. The inch of clearance allows the existing factory suspension to operate normally under light loads and standard terrain, ensuring the smooth, comfortable ride that you are used to.


Animation of a standard Timbren rubber spring

Timbren Suspension Enhancement Systems are designed to work progressively. When the hollow rubber springs are compressed, the convoluted design causes them to quickly collapse along the folds. Once the folds are compacted, the stacked barrel shape increases resistance, stiffening the suspension and keeping your vehicle level.


Timbren suspension system works to prevent body roll

Each hollow rubber spring works independently to support the driver's side or passenger's side of your vehicle. This is helpful when you swerve or make sharp turns. Each spring is activated when it is needed, so body roll is greatly reduced. The independent action also works well when you are hauling off-center loads.


An example of a trailers swaying

Because the vehicle handles better with the springs, less turbulence will be passed along to the trailer, and this helps to keep the trailer in line. Your driving comfort is further enhanced if the trailer does begin to sway (from a gust of wind or a passing semi), because the movement from the trailer is not transferred to your vehicle. This also works to make the sway subside more quickly.


An empty truck on a bumpy road without Timbren

Another great feature of the rubber construction is that the springs absorb most of the road shock, creating a smoother, more stable ride overall. Wear and tear on the factory suspension is also lessened because the rubber springs work to prevent bottoming out on rough roads.


Timbren Suspension Enhancement Compared to the Competition

Timbren's Suspension Enhancement Systems are much easier to install than air springs - there are no air hoses to run, no compressors or gauges to hook up, and no manual adjustments to make. The rubber construction makes Timbren's springs more elastic than similar products constructed of microcellular urethane. And more elasticity allows for a more comfortable ride because the rubber has more travel.



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

Installation Details TJRJK Installation instructions

This Product Fits The Following Vehicles




Customer Satisfaction Score:


Customer Reviews

Timbren Rear Suspension Enhancement System - TJRJK

Average Customer Rating:  4.7 out of 5 stars   (6500 Customer Reviews)

2,400-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:

Great product, but I had to go buy my own hardware to mount ,the nuts that came with kit would not fit the bolts way too big.



by:

Works great



by:

Very fast delivery, good product, worked as advertised. It solves the sagging when my trailer is hitched.



by:

RV handles curves much better then before, more solid handling.



by:

So far everything is working. Just as I though. The only complaint I have is the wait time that it took (12) days from the order date to when I receive the item.



by:

These are exactly what my truck needed for the heavy loads I put into the bed.



by:

Really makes a difference when hauling a heavy gooseneck.



by:

I have not put any weight on it yet so that will come later. I have a 2007 G.M.C. 2500 H.D. and I pull a 40 foot Big Horn Traveler. What I want to talk about is the install. It was quick only took about a hour. Take the tire down and start. Had no problems it went just like the video showed. I did not use the big washer I didn't have enough room.I have about 1 inch of travel before they come in to play so ride is the same.



by:

Takes the sag out for a bargain, but not as good as real springs



by:

Super easy to install. After reading several reviews about this product and how folks went about installing, found that I just needed to remove just one of the U-Bolts and just barely loosened the second. Replaced both in about 30 minutes. Shipping was quick and was exactly what I ordered. Reviews were helpful and will definitely use etrailer again.



by:

Bump stops I bought from you are way bigger and so much better than oem. Only took less than 30 minutes to install. It was very easy to install.



by:

Great product, easy to put on. It took less than 45 minutes to put the new Timber butt stops on. Only thing I would request is to tape up the box they cam in, because by the time it travels to your location it’s beat to hell and back. Like the last time I ordered the ones for the front, all the parts were missing. Luckily this time all items were still in the box.



by:

great delivery time. I received them this afternoon and installed them in about an hour. thanks to the video that showed everything step by step. thanks for a great product. I think this is just what we needed to help haul our camper and pull our car hauler at the same time. thanks again



by:



by:

Product fits as described. Will try out when I tow my travel trailer in a few weeks.



by:

Works good when pulling trailer take them out when not pulling for smoother ride only takes about 10 minutes



by:

The rear enhancement springs I ordered was exactly what I ordered. Thank you!!!



by:

Came just as advertised. Waiting to install. As an aside: You might want to make sure all box sides are securely taped as the USPO delivered the box with the un-taped side completely pulled away from the box and the suspension parts were pushing out of the box.



by:

Great Service, a company that I’ll go back too. Thanks Alex!



by:

Works great with my slide in camper easy install great product will do the front next



by:

Got them this morning as promised. Haven’t put them to the test yet but installation was a breeze, 30 to 45 minutes. That includes putting away the tools and washing my hands!



by:

Product arrived on time. Installation was easier than the video. Only took me 20 minutes.



by:

Works great. Helps to stabilize my large toy hauler behind my Ram Truck while traveling. My truck stays level with the heavy load.. Highly recommend.



by:

Every thing I got from you guys is all great . Thanks for checking !!



by:

Easy install / part of the system I used to get the "Sway" out of my awfully heavy truck camper.


25
3512
Show More Reviews

See what our Experts say about this Timbren Vehicle Suspension

  • Rear Suspension Enhancement Recommendation for 2008 Jeep Wrangler Unlimited with 4 inch Lift
    I have a suspension enhancement solution I can provide for your 2008 Jeep Wrangler Unlimited but the air bag style kits are not a fit with lifted vehicles. Instead you would want the Timbren kit part # TJRJK with the lift spacers # A25723-90AH00 for each inch of lift you have. So in your situation you would need a total of 8 for both sides.
    view full answer...
  • Recommended Timbren Rear Suspension Enhancement for 2015 Jeep Wrangler Unlimited with 4
    We have spacers that you can add to accommodate a 4" lift on your 2015 Jeep Wrangler Unlimited, but there are no Timbren kits available that come preset for a 4" lift. If your Wrangler Unlimited is a 4WD then I recommend going with the Timbren Rear Suspension Enhancement System # TJRJK. If you have a 2WD then you will want the part # TABSJRJK instead. You can accommodate your lift by choosing a combination of the following spacers for raised frame vehicles: 3/8" Bushing 1/2" Spacer -...
    view full answer...
  • What is the Difference Between the 2 Timbren Suspension Enhancements for a 2013 Jeep Wrangler
    It sounds like you already have the Timbren Front or Rear Suspension Enhancement System, part # TJFTJ, installed on the front axle of your 2013 Jeep Wrangler. This installs within the springs you already have. However, the Rear Suspension Enhancement System, part # TJRJK, is only for the rear. It also replaces the bump stops alongside the springs on the rear, not within them. This is the one for your rear since you already have the others on the front. I've linked to a video installation...
    view full answer...
  • Recommended Suspension Improvement for a Jeep Wrangler When Towing a Trailer
    Both the Timbren # TJRJK and the SumoSprings # CSS-1195R will help with sag and stability while towing. However, they will affect the ride when no towing as well. The Firestone Coil-Rite Air Helper Springs # F4173 are adjustable from 35 psi all the way down to 5 psi. This will give them up to 1,000 pounds of load-leveling capacity when filled, and then feel basically nonexistent when deflated. If you are still getting a lot of body roll when towing, or even when not towing, the SumoSprings...
    view full answer...
  • Could Curt Triflex Replace Curt Venturer In 2015 Jeep Wrangler Unlimited
    Yes a proportional Curt controller like the part # C24VV could easily replace a # C74VV. It would be just a matter of unplugging the old controller and plugging in the new one. For suspension enhancement I would go with the Timbren kit part # TJRJK instead of an air bag kit because maintaining air pressure in bags can be a bit of a hassle and the Timbrens get installed and you never have to think about them again.
    view full answer...
  • Best Timbren Suspension Enhancement For 2024 Jeep Wrangler 4xe
    The best Timbrens for your 2024 Jeep Wrangler 4xe are the following: - Timbren Suspension Enhancement System - Rear Axle # TJRJK The Timbrens are a really nice choice because of how much they will help your Jeep's handling when you are towing or even just have a heavy load. The reason why is the Timbrens take the brunt of that added weight, engaging when needed to counteract sag and body roll, helping level your truck, stabilize it, and combat sway. Additionally, Timbrens do not require...
    view full answer...
  • How to Determine Timbren Helper Spring Fit for 2017 Jeep Wrangler JK With 3 inch Lift
    Because the # TJRJK is a friction fit into the factory cup where the bump stop fits, a spacer wouldn't work.. If you can provide me a measurement, they might have a fit. They'll need the height difference between the underside of the frame and the top of the rear axle while the vehicle is sitting on the ground. If you can reply with that information, I can check back with Timbren to see if they have a solution for you.
    view full answer...
  • Suspension Enhancement Recommendation for 2017 Jeep Wrangler with 4 inch Suspension Lift
    The only suspension enhancement we can recommend for your 2017 Jeep Wrangler Unlimited is the Timbren kit part # TJRJK with the spacers # A25723-90AH00. Since you have a 4 inch lift you'd need a total of 8 of the spacers. There isn't a confirmed Air Lift solution we can provide.
    view full answer...
  • Timbren Suspension Enhancement Recommendation for 2017 Jeep Wrangler with 2 inch Lift
    The Timbren kit part # TJRJK that you referenced is the correct kit for your 2017 Jeep Wrangler, but since you have a 2 inch lift you'll also need to use spacers to take up the additional space created by the lift. For that you'd want the # A25723-90AH00 for each inch of lift. So you'd need a quantity of 4 since you have 2 inches of lift per side of vehicle. I attached an install video for the Timbren for you to check out as well.
    view full answer...
  • Does Timbren Kit for 2015 Jeep Wrangler Unlimited Come with Install Instructions
    The part # TJRJK that you referenced does come with installation instructions. I attached a picture that shows the instructions for you to check out. Basically you just pry out the old bump stop with a pry bar and press the Timbren in place of it. This will give you additional suspension support at the rear of your 2015 Jeep Wrangler Unlimited when towing.
    view full answer...
    Image 1 for
  • Recommended Enhancement For a 2021 Jeep Wrangler Unlimited 4xe Rubicon That Sags When Trailer Towing
    When dealing with sag from a trailer I recommend using the Equal-i-zer Weight Distribution System # EQ37060ET which is rated for a trailer with a tongue weight of 200-600lbs and a total trailer weight under 6,000lbs. This will help you to level your 2021 Jeep Wrangler Unlimited Rubicon 4xe and will give you sway control to keep the travel trailer tracking straight behind you while towing. You will need the 1-7/8" 12pt Thin Walled Socket # ALL643216 to install the included hitch ball. The...
    view full answer...
  • Comparison Of Timbren Rear Suspension Enhancement System vs SumoSprings Solo Custom Helper Springs
    Both are great jounce-style systems that have similar functions. The Timbren Rear Suspension Enhancement System, Item # TJRJK, is designed to provide support and stability with vehicles that are carrying heavy loads. The Timbrens are a stiffer spring that are really designed for heavy lifting often associated with trucks and their loads and so they will be a "rougher" ride in your 2009 Jeep Wrangler Unlimited Rubicon. In contrast, the SumoSprings Solo Custom Helper Springs, Item # SSR-401-47,...
    view full answer...
  • Is a Spacer Needed to Install the TJRJK on a Jeep with a 1 Inch Lift?
    If the leveling kit raised your rear end by an inch, you will need the 1 Inch spacer # A25723-90AH00. It should be noted that this is a single spacer so 2 will be needed to complete the install.
    view full answer...
  • Suspension Enhancement For 2016 Jeep Wrangler With 4 Inch Lift
    While there is a suspension enhancement option, there are no air spring kits due to the height of the spring, but if your 2016 Jeep Wrangler is a 4WD version, what you can use are Timbrens, along with 1 inch spacers: - Timbren Rear Suspension Enhancement System # TJRJK - Timbren 1" Spacer For Raised Frame Vehicles - 3/8" Bushing # A25723-90AH00 You would need a total of 8 spacers (4 on each side)
    view full answer...
  • Actual Dimensions of Timbren SES Jounce Springs in Kit TJRJK
    Timbren rear suspension jounce spring kit # TJRJK is a confirmed fit on the 2014 Jeep Wrangler Unlimited 4WD. I went to our warehouse to measure these springs for you and found their overall end to end length is 4-1/4-inches and the diameter is 2-1/2-inches.
    view full answer...
  • Recommended Suspension Enhancement Option With Most Support for 2007 Jeep Wrangler
    The Timbren Rear Suspension Enhancement System part # TJRJK is an excellent option for a 2007 Jeep Wrangler. In fact, there are few others that will provide the level of support that they do. In regards to sag, the spring will sit around 1/2"-1" away from the contact point so the Jeep will sag around this plus 1/4"-1/2" for the weight of the trailer and gear. That said, these are just estimates but you should not have much sag at all with the Timbrens and they are really the best option...
    view full answer...
  • What Is Needed To Tow a Trailer With a 2015 Jeep Wrangler Unlimited
    According to the owner's manual for your 2015 Jeep Wrangler Unlimited, the towing capacity can range from 2,000 lbs to 3,500 lbs. The components that you listed (transmission cooler/upgraded suspension components) will certainly improve your towing experience however, in the eyes of the manufacturer the towing capacity will remain unchanged for the life of the vehicle no matter what parts are added. The other issue you are going to run into is that they do not make a trailer hitch for your...
    view full answer...
  • Will the Timbrens for a 2012 Jeep Wrangler Increase Towing Capacity
    The Timbren Rear Suspension Enhancement System part # TJRJK is an excellent option for a 2012 Jeep Wrangler. It will help when towing or hauling heavy loads so you don't have excess rear end sag which leads to issues with braking, stability, etc. I will however say that they won't increase towing capacity nor is there really any product that can do this. I must recommend you tow inside your vehicle's capacities but using these Timrbens will increase performance in doing so.
    view full answer...
  • Rear Suspension Enhancement Option For A 2021 Jeep Wrangler Sahara 4xe With Lift Spacer In Coils
    Hello Kyle. The Air Lift 1000 Coil Helper Springs # AL60829 will not be compatible with the coil spring lift spacers on your 2021 Jeep Wrangler Sahara. As you said, it appears the spacers would obstruct the air line, so they would have to be removed in order to use the coil helpers. A better option would be to use the Timbren Rear Suspension Enhancement System # TJRJK. These will simply replace/upgrade the factory bumpstop. Timbren also offers spacers that can be used to compensate for...
    view full answer...
  • Suspension Enhancement for 2014 Jeep Wrangler for Towing Heavy Trailer
    Suspension enhancement for your 2014 Jeep Wrangler like the Timbren # TJRJK that is a confirmed fit will do a great job giving you additional suspension support for towing up to the capacity for your vehicle but you should note that it does not allow you to tow beyond what your vehicle was rated for as there are other factors like braking, frame strength, cooling capacity, transmission rating, engine rating etc. This is why suspension enhancement while proving additional suspension support...
    view full answer...
  • Correct Airbags for a 2017 Jeep Wrangler Unlimited With Lift
    I do have an option for you but airbags won't be one if the lift uses aftermarket coil springs. The only option for a 2017 Jeep Wrangler Unlimited lifted would be the Timbren Rear Suspension Enhancement System part # TJRJK which will require spacers equal to the lift, part # A25723-90AH00.
    view full answer...
  • Will Coil Spring Air Bags Work On a Lifted 2013 Jeep Wrangler Unlimited
    In order to help provide rear end support on a 2013 Jeep Wrangler Unlimited while towing you have a few options. That said, these options are all designed for the factory suspension. Therefore, if you have aftermarket coil springs there is no way for us to confirm fit for a set of air bags which install inside the coil springs. The only option we have to provide support is the Timbren Rear Suspension Enhancement System part # TJRJK because you can add multiples of the Timbren Spacers...
    view full answer...

Do you have a question about this Vehicle Suspension?


Info for this part was:

Employee Mike L
Expert Research:
Mike L
Employee Jameson C
Expert Research:
Jameson C
Employee Adam R
Expert Research:
Adam R
Employee Joshua S
Video Edited:
Joshua S
Employee Jacob T
Video Edited:
Jacob T
Employee Dustin K
Video Edited:
Dustin K
Employee Chris R
Video Edited:
Chris R
Employee Mary K
Updated by:
Mary K
Employee Wilson B
Updated by:
Wilson B
Employee Hannah L
Updated by:
Hannah L
Employee Michael B
Updated by:
Michael B
Employee Noah M
Updated by:
Noah M
Employee Carrie F
Updated by:
Carrie F
Employee Bethann B
Updated by:
Bethann B
Employee Jonathan Y
Video by:
Jonathan Y
Employee John S
Video by:
John S
Employee Robert C
Installed by:
Robert C
Employee Ed W
Test Fit:
Ed W
Employee David F
Test Fit:
David F

At etrailer.com 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.