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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
THIS ITEM IS NOT A FIT FOR
1999 Ford Ranger
Timbren

Timbren Suspension Enhancement System - Rear Axle

Part Number: T45MR
In Stock
$269.36
Retail:$316.90
You Save: $47.54
Vehicle Suspension
Not Confirmed to Fit

1999 Ford Ranger

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6,000-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 T45MR can be ordered online at etrailer.com or call 1-800-940-8924 for expert service.
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Timbren Vehicle Suspension - T45MR

  • Bump Stops
  • Towing/Load Leveling
  • Timbren
  • Rear Axle Suspension Enhancement
  • Extra Heavy Duty
  • Suspension Only

6,000-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.


Features:

  • Improves suspension, handling, and safety
  • Becomes more rigid as more weight is added for 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 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 a simple installation
    • Installs directly onto frame
    • No drilling required


Specs:

  • 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.
  • 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 when loaded. 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 when loaded or towing because the rubber has more travel.



TORTNDR Timbren SES with Aeon Hollow Rubber Springs - Rear Axle

Installation Details T45MR Installation instructions

This Product Fits The Following Vehicles




Customer Satisfaction Score:

Ratings & Reviews

4.7

3654 reviews
5 Stars
(2910)
4 Stars
(468)
3 Stars
(116)
2 Stars
(71)
1 Star
(89)
6,000-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.

by:

You would even know the trailer had a load in it…works perfectly!



by:

Rec'd today, looks Great. Haven't installed yet.



by:

Very easy to install..instructions very easy to follow.



by:

Installed. Have not had a chance yet to see how they work. Was only a ten minute job to install cant wait to put them to use.



by:

Installed in 15 minutes! Significant improvement in ride with my 6000lb (loaded) lance camper on a F450.



by:

Order delivered on time and in good condition. Good customer service and follow up.



by:

This product did not give any improvement over the stock configuration. It was a waist of time and money.



by:

Came on time easy to install and works like a charm.



by:

Very Poor and unsatisfactory. Box arrived unsealed with no attempt to tape box closed from shipper or manufacturer. Hardware is the worst quality control I have seen in 25 years of working with automotive parts. The 3/8 nut welded to the flat bar was painted inside 75% of the threads and the nut and bolt are stripping trying to clean up the threads. The welding and painting is very poor quality on all parts. Paint shows bare steel in many locations. The nuts and bolts are plain steel and not protected from corrosion at all except where they got paint from the flat bar inside the threaded nut!



by:

Came quickly, easy install now excited to give it a try!



by:

Easy to understand instructions, easy to install.



by:

installed as instructions stated piece of cake to install



by:

have not got them in yet but got here a day eraly thanks



by:

Thay do not touch rear housing after loading One half inch gap Ronnie dobbins



by:

Fast delivery, easy installation, they work great. Recommend.



by:

I haven't installed these yet, but they were just what I was looking for to take the "squat" out of my truck while pulling my toy hauler.
These along with my WDH should level the truck just fine.



by:

The items get shipped really quickly, and their prices are excellent. Great customer service too!



by:

This worked as advertised, install was quick and easy!



by:

Was able to install easily with video.



by:

The supplied bolts are too short. Finding the right bolts added to time to do the install.

The jounce springs are 1/2 inch from axle. I'm sure the ride will be very harsh even when not loaded...



by:

Tried to order part first time, rotten customer service. Called back spoke to manager, much better service received part very quickly. Unfortunately part had bad bolts and or nuts, would not work together. Manager said if I had any problems I could call her number directly and she would take care of it. Have tried to reach her for three days no response. Called regular etrailer number and they want pictures sent to them and then it would have to be reviewed and I was informed I they were behind schedule, so only could guess how long it would take. Sending parts back and demanding refund. Have been doing business with etrailer for many years and this is the thanks I get for being a long time customer. Will not be shopping with etrailer ever again



by:

great and fast service needed the parts right away for a road trip and you got it done



by:

Gave 4 stars because when the truck is empty the ride is a little rough. But when I'm towing anything it's awesome



by:

They went right on and all the hardware came with them.



by:

good customer service


25
3654
Show More Reviews

See what our Experts say about this Timbren Vehicle Suspension

  • Do I Want Sumo Springs or Timbrens to Pair with My Weight Distribution Hitch?
    Hello Barry, Since you already have a weight distribution (WD) hitch and are only experiencing a little rear sag, I recommend going with SumoSprings. I typically only suggest Timbrens for those who are towing heavy loads regularly, as they can create a noticeably harsh ride when the vehicle is unloaded. Given that the sag is “not much but noticeable,” the SumoSprings Custom Helper Springs Rear Axle # SS46PV (blue) should be a great fit. These are rated for 1,400 lbs, while the yellow...
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  • Recommended Timbrens and Spacers for a 2025 Toyota Tundra w/ a Factory Lift
    Hey Scott, congrats on the new truck. I checked with Timbren's website and they do not go into specifics on how many spacers or what size you're going to need. The instructions for the Timbren Suspension Enhancement System item # T45MR say to leave a 1/2" - 1-1/2" gap between the spring and the part of your axle where they contact. Giving a range like that is so you can adjust the spacers for your comfort and ride height preferences. Since your 2025 Toyota Tundra has the factory lift,...
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  • Do I Need to Add Timbrens to the Front of My 2024 Toyota Tundra for Hauling a 7K Trailer?
    Hello Edward, Great choice on the Timbrens for the rear. Since all of your weight is in the rear of the truck I do not think that it is necessary to put them on the front, even with hauling a 7,000 pound trailer. All of the focus is on the tongue weight which is what pulls the rear of your truck down. Now if you were thinking of installing a winch, using a snow plow, or any heavy accessory on the front of the vehicle, then you would want to add the Timbren Front Suspension Enhancement...
    view full answer...
  • Availability of Timbren Rear Suspension Kit that Fits 2026 Toyota Tundra
    Hey Thomas, we have the TORTNDR that fits your 2026 Toyota Tundra with our part number # T45MR. We also have the severe duty part # T65MR that is their part number TORTTNDR. What version of the Tundra do you have?
    view full answer...
  • Will SumoSprings Fit 2023 Toyota Tundra TRD With Lift Kit
    Hey Joshua! All of the SumoSprings like # SS46PV are designed to fit the Tundra at stock height. SuperSprings does not offer additional spacers to make up for the height difference so these won't work on your Tundra TRD with the lift. What you can use instead is the Timbren Suspension Enhancement System # T45MR. You will also need the Spacer Kit for Timbren Suspension Enhancement System # T33AV. If you don't like the Timbren the only other option would be to add an air bag system like...
    view full answer...
  • Is Spacer Needed for Install of Timbren Kit T45MR on 2024 Toyota Tundra SR5
    Hey Jerry, you would not need to use any additional spacers with the Timbren kit part # T45MR that fits your 2024 Toyota Tundra SR5. Since your truck is all stock and this kit was designed to fit your vehicle no additional spacers would be required.
    view full answer...
  • Should I Run the Spacer with the Timbren for 2025 Toyota Tundra
    Hey David, I would test fit everything and see which orientation works best. With the spacer or without. Ideally when the kit is installed there will be 1 inch of space between the Timbren and the frame so whichever orientation gets closest to that would be what you'd want to go with. If you do run the spacer and you find that the ride quality is rough you can always remove it to improve the ride quality.
    view full answer...
  • Height of Timbren SES for 2025 Toyota Tundra 4x4
    Hey Gregg! The overall height of the Timbren Suspension Enhancement System # T45MR is 6". See the attached picture. This is confirmed to fit your 2025 Toyota Tundra 4x4 without a lift. If you need anything else feel free to reach out in the comments below.
    view full answer...
  • Suspension Enhancement for 2024 Toyota Tundra With 3" Lift
    Hey Joe! SumoSprings doesn't have an option for additional spacers so they will not work with your lift. The gap between the springs and the frame would be too much so they would never engage. If you don't want air bags the Timbren SES # T45MR is the only option. The height of the Timbren is 6" and you want about a 1" gap so you can add two of the Timbren 1" Spacer For Raised Frame Vehicles # A25723-90AH00 on each side. Take a look at the picture of the spacers below, it will still be...
    view full answer...
  • Timbren Suspension Enhancement Options For A 2023 Toyota Tundra TRD PRO
    With the Timbrens there isn't a difference in fitment between standard model Tundra's and the TRD Pro so you'll be able to use one of the following options for your rear suspension: 4,800lb capacity # T83MR 6,000lb capacity # T45MR 7,000lb capacity # T65MR If you'd like to swap out the front bump stops as well then you can choose from the following options: 1,800lb capacity # TABSTOF 14,000lb capacity # TTOFTUN4
    view full answer...
  • Are Timbrens Available for 2024 Toyota Tundra
    Yes we do have a set of Timbrens that fit your 2024 Toyota Tundra with the part # T45MR. These can give you up to an additional 6,000 lbs of suspension support.
    view full answer...
  • Best Timbren Suspension Kit for a 2024 Toyota Tundra
    The best Timbren kit for your 2024 Toyota Tundra is the Timbren Suspension Enhancement System # T45MR rated for 6K. The Off-Road kit and the 7K kit will have the Timbren bumpers engaging a bit quicker than what you'll need with standard vehicle use which is why the 6K version is best.
    view full answer...
  • Suspension Enhancement Recommendation for 2024 Toyota Tundra with Gooseneck Hitch
    For your 2024 Toyota Tundra that has a gooseneck hitch installed the suspension enhancement you'd want is the Timbren kit part # T45MR as it's only option that is compatible with the in-bed hitch as well as provides adequate support to reduce suspension sag.
    view full answer...
  • Recommended Suspension Enhancement For 2022 Toyota Tundra With 3-1/2 Inch Lift
    That's a cool set up you have there, and the best option for suspension enhancement for your 2022 Toyota Tundra is going to be Timbrens to help support the added weight in the rear. The correct part number for your '22 Tundra is the following: - Timbren Suspension Enhancement System - Rear Axle # T45MR The reason why I like the # T45MR is because they the brunt of that added weight, engaging when needed to counteract any type of sag and body roll you'll get with the camper and that added...
    view full answer...
    Image 1 for
  • What Is The Difference For The Timbren Jounce Springs For a 2022 Toyota Tundra?
    First we have the Timbren Active Off-Road Bumpstops # T83MR for your 2022 Toyota Tundra. These bump stops allow for the most suspension travel while still absorbing road shock to improve your suspension comfort off road. The Timbren Suspension Enhancement System # T45MR is their standard set of jounce springs. This is the kit you want if you are looking to reduce sag while hauling heavy loads but also still drive without any additional weight at times. Finally the Timbren Severe Service...
    view full answer...
  • Overall Height of Timbren Suspension Enhancement System T45MR For Toyota Tundra
    I checked with Timbren, and the overall height (from the top of the bracket that bolts to the frame to the bottom of the spring) is 6 inches for the Timbren Suspension Enhancement System # T45MR.
    view full answer...
    Image 1 for
  • Is T45MR a good fit for my 2024 Toyota Tundra to aid in hauling my 6000 lb camper
    Hi Tom, since you only tow 40 hours out then I would recommend taking a look at part # HE49FR, the Hellwig Pro Series Helper Springs. They have 2,500 lbs capacity and are bolted on between your factory leaf springs and the bump stop. The Timbren springs are good however they work best when the truck is carrying a load. When the truck is empty, they tend to give a rougher ride. You can still use them however be prepared to uninstall when you are not towing. The Hellwig springs can be adjusted...
    view full answer...
  • Options For Helping The Rear Suspension On A 2023 Toyota Tundra SR5 6.5' Bed
    There will be a few options for helping the rear suspension on your 2023 Toyota Tundra. Adding a Timbren Suspension Enhancement System # T45MR will certainly help to reduce sagging and improve stability when towing. The main advantage of Timbrens is they are easy to install and require no maintenance. The downside is that they may create a bit of a bumpy ride at times when you are not towing or carrying your quad. The other option is adding an air bag kit like the Air Lift LoadLifter...
    view full answer...
  • Do Timbren Suspension Enhancement Work on 2024 Toyota Tundra With Coil Springs
    They do; even with coil springs on your 2024 Toyota Tundra you can install and use the Timbrens, with the correct part number for your truck being the following: - Timbren Suspension Enhancement System # T45MR The # T45MR will install next to the coil springs so there won't be any interference and the two will work together.
    view full answer...
  • Recommendation For Reducing Sag On 2022 Toyota Tundra SR 4x4 When Trailer Towing
    The best solution for reducing your rear end sag on your 2022 Toyota Tundra SR while also providing for the safest ride possible is by installing a Equal-i-zer Weight Distribution System. The Equal-i-zer helps to redistribute the tongue weight more evenly across your Tundra reducing sag. Reducing rear end sag removes the light steering feel and diminished braking. This hitch also helps to reduce trailer sway which often occurs due to the large size of the camper and strong winds. You will...
    view full answer...
  • Front and Rear Suspension Enhancement for 2022 Toyota Tundra Towing Travel Trailer
    The Coil SumoSprings # CSS-1094F are designed to add additional support to the front. Since you don't have a front load on your 2022 Toyota Tundra I don't think this will be necessary or make a real difference. As for the Timbren # T45MR, I would consider how frequently you're towing or hauling before adding them. If you're towing this trailer all the time they are an alright option. If not, your unloaded ride quality will likely leave you wishing you hadn't added them to the truck. I...
    view full answer...
  • Will Installing Timbren SES Affect Offroad Performance Of A 2024 Toyota Tundra TRD Pro
    Hey Carlos, Yes, installing the Timbren Suspension Enhancement System # T45MR will affect your ride quality and handling while off-roading in your Tundra. These springs provide a cushion between your frame and axle so that the harsh bumps over rough terrain won't throw you around. Timbrens are well known within the off-roading/overlanding community as the gold standard for suspension enhancement so you're making a solid choice. Timbren recommends a 1" gap between the axle and spring...
    view full answer...
  • Timbren Suspension Enhancement For 2024 Toyota Tundra With 3-1/2 Inch Lift
    Hi David, There is an option for bump stops for your 2024 Toyota Tundra with a 3-1/2 inch lift by using Timbrens, you'll just need a spacer kit and some extra spacers to go with it. So what you can use is the Timbren Suspension Enhancement System # T45MR, Spacer Kit # T68MR, and a couple of the Timbren 1" Spacer # TA25723-90AD00.
    view full answer...
  • Rear Suspension Enhancement For a 2022 Toyota Tundra Limited TRD With Coil Spring Suspension
    Yes, the Timbren Suspension Enhancement System # T45MR will fit with the coil springs on your 2022 Toyota Tundra Limited TRD. These mount in place of the frame mounted bump stops you will currently have outside the coil springs. I have linked the installation instructions below so you can see the required steps and placement. We also have the Air Lift LoadLifter 5000 Ultimate Air Helper Springs with Internal Jounce Bumpers # AL24JQ if you are looking for a more adjustable system. The...
    view full answer...


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Info for this part was:

Employee Jeff D
Installed by:
Jeff D
Employee Jameson C
Expert Research:
Jameson C
Employee Dustin K
Video Edited:
Dustin K
Employee Chris R
Video Edited:
Chris R
Employee Wilson B
Updated by:
Wilson B
Employee Matthew S
Updated by:
Matthew S
Employee Carrie F
Updated by:
Carrie F
Employee Lincoln B
Updated by:
Lincoln B
Employee Daron K
Edited by:
Daron K
Employee Alex H
Written by:
Alex H
Employee John S
Video by:
John S
Employee Bradley B
Test Fit:
Bradley B

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