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  1. Vehicle Suspension
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  3. Jounce-Style Springs
  4. Rear Axle Suspension Enhancement
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Timbren Suspension Enhancement System - Rear Axle

Timbren Suspension Enhancement System - Rear Axle

Item # T45MR
Our Price: $252.45
You Save: $44.55
Vehicle Suspension

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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. Great Prices for the best vehicle suspension from Timbren. Timbren Suspension Enhancement System - Rear Axle part number T45MR can be ordered online at or call 1-800-940-8924 for expert service.
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  • Reviews (5)
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Timbren Vehicle Suspension - T45MR

  • 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.
  • 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.

TORTNDR Timbren SES with Aeon Hollow Rubber Springs - Rear Axle

Installation Details T45MR Installation instructions

This Product Fits The Following Vehicles

Customer Reviews

Timbren Suspension Enhancement System - Rear Axle - T45MR

Average Customer Rating:  4.4 out of 5 stars   (5 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.

2022 Toyota Tundra

I’m hoping that it will help as much as all the things I’ve researched say it will but o don’t understand how I’m supposed to install it if in the directions it shows three bolts washers and nuts in each oh the the bracket holes plus mounting the rubber to the bracket with another bolt washer and nut when one two bolts washers and nuts total were provided. I am short six bolts washers and nuts to mount them on my vehicle.

For this system you will re-use the hardware that you remove when taking off the original vehicle bump stops. When removing the hardware, you will want to use a penetrating fluid first to make it easier to remove them.
-- Etrailer Expert Jenny N - 01/04/2023


Needed help with sagging when loading bed. This fixed that situation. I don’t notice they are there when truck is unloaded.

2023 Toyota Tundra


See what our Experts say about this Timbren Vehicle Suspension

  • 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...
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  • 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...
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  • Will Air Lift Air Bags for a 2022 Toyota Tundra Work with In-Bed (5th Wheel/Gooseneck) Hitch
    The Air Lift LoadLifter 5000 Air Helper Springs part # AL84JQ or part # AL24JQ for internal jounce bumpers which are fits for a 2022 Toyota Tundra won't work with an in-bed (fifth wheel/gooseneck) as the brackets mount in the same location. If you're just using a bumper pull trailer this won't have any affect on your setup. It's only for the fifth wheel and gooseneck trailers that you will run into issues with. In which case, I'd instead recommend the Timbren Suspension Enhancement System...
    view full answer...
  • How To Stop Fresh Water Tank In RV From Leaking
    The water leaking is normal its your overflow which means that your fresh tank is now full. If you install a valve on the overflow then it needs to be open when filling and when using or else the tank could explode. It could also be that your check valve went bad. The Valterra Check Valve for RV Fresh Water Systems # P23415LFVP has dual 1/2 inch MPT. The Valterra Check Valve for RV Fresh Water Systems # P23402LFVP has a 1/2 inch MPT x 1/2 inch FPT.
    view full answer...
  • Is There Flat Bracket For Air Lift Air Bags on 2022 Toyota Tundra For Use With Gooseneck
    The Air Lift LoadLifter 5000 Air Helper Springs # AL84JQ will not work with a gooseneck hitch, the B&W Turnoverball # BW96FR that fits your 2022 Toyota Tundra, nor is there a flat bracket that for the kit. There is a single option for suspension enhancement for a '22 Tundra that will work with a gooseneck hitch, the Timbren Suspension Enhancement System # T45MR. The brackets on these have the correct shape to work with the # BW96FR gooseneck plates. I realize it's not the answer you...
    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...
  • Suspension Enhancement That Works With Gooseneck Hitch on 2022 Toyota Tundra
    While there is a suspension enhancement option that will work with a gooseneck hitch on your 2022 Toyota Tundra, the air bags you asked about will not because they mount in the same location as the hitch brackets. So instead, what you will need to use are Timbrens, with the correct part number for your '22 Tundra being the following: - Timbren Suspension Enhancement System # T45MR I verified that the # T45MR uses a different style and positioning of brackets than air bags, which is why...
    view full answer...

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Info for this part was:

Employee Jeff D
Installed by:
Jeff D
Employee Wilson B
Updated by:
Wilson B
Employee Carrie F
Updated by:
Carrie F
Employee Daron K
Edited by:
Daron K
Employee Alex H
Written by:
Alex H

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