The best technical support and full vehicle suspension installation instructions. Lowest price Tacoma vehicle suspension guarantee and expert service. Toyota Tacoma, 2012 vehicle suspension by Timbren are available from For expert service call 800-298-8924 to order your Timbren Rear Suspension Enhancement System part number TTORTUN4L, or order online at
Select Your Vehicle

View Cart

Suspension Enhancement > 2012 > Toyota > Tacoma

zoom in icon
zoom out icon
pop out icon
replay 360 icon
Timbren Timbren Timbren Timbren Timbren Timbren Timbren Timbren Timbren Timbren Timbren
Video Demo Timbren Vehicle Suspension TTORTUN4L

Timbren Vehicle Suspension TTORTUN4L Review

2012 Toyota Tacoma Timbren Rear Suspension Enhancement System

Timbren Vehicle Suspension

(16 reviews)




Shipping Special

Shipping Weight: 5 pounds


2012 Toyota Tacoma - Timbren Rear Suspension Enhancement System

3,000-lb Capacity. These hollow rubber springs sit above the rear axle to help stabilize and level your Toyota Tacoma. 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
      • Does not affect the empty ride of the Toyota Tacoma
    • Becomes more rigid as more weight is added
      • Increases stability - providing great performance while hauling heavy loads
      • Reduces Toyota Tacoma 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 Toyota Tacoma's suspension


  • Includes 2 Aeon hollow rubber springs, Toyota Tacoma-specific brackets and hardware for simple installation
    • Replaces axle bump stops on frame
    • No drilling required
  • Capacity: 3,000 lbs
    • Do not exceed the Toyota Tacoma's weight-carrying capacity
  • Designed to work with a suspension system that is in good working order
  • Limited lifetime warranty - satisfaction guarantee

Reduced rear axle sag with Timbren suspension enhancement

Whether you're hauling heavy loads in your bed or cargo area or towing a trailer, you will often see the rear of your Toyota Tacoma 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 your rear axle. Hollow rubber springs are bolted to the bottom of the bracket and hang down to where the bottom of the leaf 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.

Action 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 Toyota Tacoma 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 Toyota Tacoma. 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.

Trailer swaying as it is towed behind a truck

Because your 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 SES

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.

TORTUN4L - Rear Suspension Enhancement System with Aeon Hollow Rubber Springs by Timbren

TTORTUN4L Installation InstructionsInstallation Details TTORTUN4L Installation instructions

Video of Timbren Rear Suspension Enhancement System

Videos are provided As a guide only. Refer To manufacturer
installation instructions And specs For complete information.

Video Transcript for Timbren Vehicle Suspension TTORTUN4L Review

Today we will be reviewing part number TTORTUN4L. This is the Timbrand Rear Suspension Enhancement System. It is designed to improve suspension, handling and safety. These are going to be vehicle specific, so to make sure they are going to fit your particular year, make and model, you can refer to the vehicle list at the bottom of the product's product page. It's going to provide additional support as needed so you always have a nice, smooth, comfortable ride. It's actually going to allow the lead springs plenty of movement while cushioning light loads. It will not affect the empty ride of the vehicle.

It is designed to become more rigid as more weight is added, which is going to increase stability. It's also going to reduce vehicle sag. Overall it's going to provide better performance while hauling heavy loads. They are designed to work independently, side to side, so it's going to help compensate for off-center loads. It's also going to help produce body roll when swerving and turning corners.

They actually act as shock absorbers, taking the force of bumps and rough roads, which is also going to help extend the life of your vehicle's suspension system. It's going to include the 2 hollow rubber springs, the vehicle specific brackets, and all the hardware that's necessary for a simple installation. They are designed to replace the axle bump stops on your frame. For the installation, no drilling is required. They are going to offer a capacity of 3,000 pounds, but you want to be careful not to exceed the vehicles' weight carrying capacity. They are designed to work with a suspension system that's in good working order. So the way that they install is that you will have to loosen the axle U-bolt and remove the existing bump stop. Then you are going to mount this portion to the axle and the U-bolts are going to go over the flat portion here, right at the base of those wings.

That's going to help distribute and also keep the U-bolts in place. Once you have that on there, you are going to tighten the U-bolts back down. Now the hardware on this system is designed to be installed from the bottom, going up. So the head of the bolt has an Allen tool designed to it, so you will need to use an Allen key or an Allen tool to get it tightened down properly. There is going to be a washer located on the inside of the spring here. So you can see that there, peaking in there.

The washer is already installed, so you want to make sure that the washer is lined up with the mounting hole. It's going to set on that portion there. Again, the hardware is going to come up through the slots, making sure that it goes through the washer. Then you are going to install the lock nut through the larger hole here, making sure it goes down all the way on top of that bolt. So you may need to use an extension for your socket wrench to reach all the way down there and get that seated correctly. Now the actual bump stop, or the spring, is going to give us an overall length of about 3-5/8". That's going to do it for our review of part number TTORTUN4L. This is the Timbrand Rear Suspension Enhancement System. .

Customer Reviews

Timbren Rear Suspension Enhancement System - TTORTUN4L

Average Customer Rating:  4.8 out of 5 stars   (16 Customer Reviews)

3,000-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.


by: Dan S.07/30/2013

The order and shipping process was flawless -- the Timbrens arrived exactly when E-trailer said they would. An hour after they got here, I had them completely installed. As of this date (7/30/13), the posted instructions (and the ones that came with the Timbrens) are not quite correct for a new Tacoma, as I verified with a Timbren tech. (These are Tacoma-specific issues -- they may not apply to other trucks.) Do not jack the truck up. I ran the back tires up onto blocks (to give myself more room underneath) and set the parking brake. I put a jack stand under the differential -- probably not needed. I crawled under and did one side at a time -- loosen the u-bolts, remove the old bump stop, stick in the new Timbren, and tighten. Not technically demanding at all. My crawler dolly was very helpful. Some tips: use a 9/16 socket with an extension to put the nut onto the bolt inside the Timbren rubber spring and then tighten the bolt with an Allen wrench. When loosening the Tacoma's u-bolts, use a 3/4 socket. Depending on the clearance between the leaf springs and the frame, you may need to remove one side of the u-bolt assembly to install the Timbren because the angle of the baseplate is greater than the angle of the OEM bump stop. I was told that the u-bolt nuts on a Tacoma should be re-tightened with a torque wrench to about 70 foot/pounds. I found it a little tiring to lay on my back and torque the nuts, but then again I am verging on elderly. A young person in decent shape should have no trouble. I don't know yet if the Timbrens will help my saggy rear end when I am towing a trailer, but others have said that this will be very helpful. This is my second major purchase from E-trailer -- I am impressed with their selection, service, and pricing. 92404


After a year or more of hard use, the product is still going strong thanks for asking!

Dan S - 01/29/2015



by: Rick S.08/20/2012

2010 Nissan Frontier with Timbren suspension components. Trailer is a Jayco X17Z with close to 450lbs of tongue weight. Pictures are a before and after view of the rear suspension droop. 52393


Since the Timbren install we have towed the camper on back roads with stop and go traffic as well as on the highway at 65 mph. The Pro4X does ride level and handles the added weight well. I wish I had a longer wheel base and a tandem axle trailer as on occasion we develop a slight up and down oscillation until the suspension settles down. It is noticeable when driving over long bridges. This is mainly due to the truck setup and not the Timbrens. We had this problem before the install and the Timbrens are making a difference.I have also hauled an estimated 780 lbs of hardwood flooring in the bed at 65mph and the truck handled it with no problem. It remained level and stable.

comment by: Rick S - 01/29/2013


You might be able to adjust the tongue weight of the trailer and get that oscillation to settle. You want your tongue weight to be about 10-15% of the trailer total weight. Also if the trailer does not ride level, looking into getting a different drop length ball mount that will get the trailer level or even slightly nose down.

Patrick B - 2/8/2013


by: Dennis O.01/18/2015

These spring stops seem like a heavy duty quality product. Very easy installation on my 13 Nissan Frontier by jacking up vehicle under shock mounts and removing tire, then clean area with compressed air and remove clamp nuts with air gun (if owned) remove old stops and install new stops and retighten nuts. I have about 1/2" to 3/4" clearance as advertised. Have not been able to haul anything yet but am sure they will help greatly. Also do one tire at a time (Safety) sorry no pictures. etrailer was quick to process and ship order. Great Business. Thanks etrailer Dennis O. 170343


Still working great!!

Dennis O - 01/18/2016



by: Joe D.11/11/2013

I purchased this kit to keep my 2013 Toyota Tacoma Double Cab Short Bed from bottoming out when it has a load in the bed. It really did the trick as well as improved the stability with or without a load. The only down side is that the suspension is much more stiff without a load in the bed. It took some getting used to, but after having them on for a couple months, it doesn't bother me. 106946


by: ACS08/11/2014

I can't speak to ease of installation, I have a buddy with a car shop and it's just as easy to let him do it. As for ride with and without a load, this does what it says it will. Squat on my 2013 Nissan Frontier was greatly reduced when towing. There is a definite 'gallup' when you hit a small pot hole or bump in the road when under load, but it quickly fades away. I recommend these if you need occasional support but don't want to sacrifice unloaded ride. 145946


by: Steve W.10/07/2014

Everyone told me to use super springs to help handle the extra weight from my truck camper,so I bought them- What a WASTE of my money! A neighbor told me about your product, so I purchased a set - They are great! They work perfectly! My Nissan Frontier handled great. I love these things! Easy to install and they don't affect my ride or handling. 155075


by: Paul V08/16/2012

Product is excellent. From the time I took the parts out of the box until the time I lowered the truck of the jack it only took me 45 minutes to complete the installation. Easy to install with only a few basic tools. The truck no longer sways around corners. It may ride a little stiffer but barely noticible. Well worth the price. 51870


by: Charlie P06/14/2016

Bought this product for a 2012 Nissan Frontier. The installation and product is a little different than for most vehicles but the online information was good enough for me to pick the right product. Delivery was quick and installation was easy. Haven't load tested the product, yet. 261181


by: Jeremy01/30/2013

Found these very easy to install on my 2005 Tacoma. The back end was beginning to sag some from overloading so added a helper spring to give the Timbrens some clearance and these fit in as designed. With a loaded 16' equipment trailer, the truck rides level and smooth. 64558


by: David03/05/2013

Fairly easy to install. Haven't had a chance to try it out with a load yet but looking forward to it. Better than adding a leaf and raising it up and nothing to maintain like an air system would have. etrailer customer service is top of the line. 69032


by: Rob03/29/2012

2009 Tacoma, rear supports, easy install, jack it up, take off wheeel, remove 1 u bolt holding leaf spring and loosen the other, remove old bumper and slide in a new one, tighten & you're done. 35471


by: John W05/09/2013

Seems like a good product, haven't pulled trailer yet. But unloaded drives well. Tell people that they need a 5.5 mm allen wrench & impact wrench to make install smoother. 79630


by: Dave L08/24/2016

Awesome product, does exactly what it's designed to do. I would recommend this product to anyone that owns a truck and loads their truck bed with heavy stuff periodically. 287249


by: Barry M09/16/2014

Great product. Allows me to pull my trailer without excessive suspension play. Works great. 151550


by: Jeff R08/08/2014

easy installed !! have not take pickup out and test it with enclosed trailer. 145388


by: Cesar12/02/2011

great product i installer on a 2005 Nissan Frontier works great 27534


Ask the Experts about this Timbren Vehicle Suspension
Do you have a question about this Vehicle Suspension?

  • Installation Instructions for Timbren Suspension System on a 2012 Nissan Frontier Pro4X 4x4 Off Road
  • To install the Timbren Rear Suspension Enhancement System, # TTORTUN4L, on your 2012 Nissan Frontier Pro4x 4x4 you will need to safely raise the vehicle to allow the axle to hang freely, then loosen the axle u-bolts and remove the OEM rubber bump stop. Next, install the lower bracket from the Timbren kit where the OEM bump stop was. Finally, tighten the U-bolts and safely lower the vehicle. I have attached installation instructions for you to review.
    view full answer...

  • What Is the Installation Like for Timbren Springs on a Toyota Tacoma
  • The install for the Timbren Rubber Enhancement Springs, part # TTORTUN4L, is fairly easy, just one bolt and nut to install the spring and bracket. It bolts in the same location as the factory bump stop. You will just need to jack under the frame of the truck to relieve the tension on the suspension. Remove the bump stop, 1 bolt and nut, and finally install the Timbren spring again with 1 nut and bolt. Repeat on the other side. I have included a link to the directions. I have added links...
    view full answer...

  • Overall Height of Timbren Suspension Enhancement Springs # TTORTUN4 for a 2010 Toyota Tacoma
  • I went out to the warehouse and actually pulled 2 possible fits for your 2010 Toyota Tacoma. First, for Timbren springs # TTORTUN4, the overall height from the bottom of the bracket to the top of the spring is approximately 5 inches. The other kit I pulled was # TTORTUN4L. This kit is a bit shorter at 4-1/2 to 4-5/8 inches tall overall. I have included links to hte isntructions for both kits as well as a link to our FAQ article on Timbren systems for you.
    view full answer...

  • Do U-Bolts of 2012 Toyota Tacoma Get Removed for Timbren Installation
  • To get the mounting plate for the Timbren of part # TTORTUN4L onto the suspension of your 2012 Toyota Tacoma will require the temporary loosening of the U-bolts. This will allow you to slip the U-bolts over the plate so that it can be secured after removing the factory bump stop plate. I attached a picture we got sent from a customer who installed this kit that shows it installed.
    view full answer...

  • Rear Helper Springs for a 2013 Toyota Tacoma
  • Helper springs is a general term that can be applied to all suspension enhancement products. So what it comes down to is jounce style springs versus air bags. Jounce style springs are excellent for the same kind of load all the time, such as towing a trailer. But they also work independently side to side. Air bags are a great option for carrying different size loads in the bed. When set up for it, air bags will allow you to level the bed side to side to compensate for varying load sizes. If...
    view full answer...

  • Timbren or SumoSprings Suspension Enhancement Recommendation for a 2016 Toyota Tacoma
  • For your 2016 Toyota Tacoma both the Timbren part # TTORTUN4L and the SumoSprings part # SSR-610-40 are confirmed as a fit. I would recommend going with the SumoSprings though as we have found they provide a smother ride quality than the Timbrens which tend to be a bit harsh. Both should easily last the lifetime of your truck, but the Timbren has a limited lifetime warranty whereas the Sumo only has a 2 year warranty. I would not need to see pictures of your current bump stops.
    view full answer...

  • Using a Weight Distribution System to Level a 2006 Toyota Tacoma and Cargo Trailer
  • The best way to reduce sag at the rear of a vehicle when towing a trailer is to use weight distribution. I recommend a system that has built-in dual cam sway control to prevent trailer sway before it starts. For the right sized system, you will need to know the tongue weight and gross trailer weight of the trailer when it is fully loaded and ready to tow. For example, if the tongue weight of the trailer is 400 pounds, you would need a system with a 200 to 600 pound tongue weight capacity....
    view full answer...

  • Suspension Enhancement for a 2010 Toyota Tacoma 4x4
  • Heavier springs are going to create a stiffer ride all the time and not just when there is a load in the truck. Adding Timbren springs to your 2010 Toyota Tacoma will pretty much keep the unloaded ride the same and then offer support and improve the ride when under load. Timbren springs # TTORTUN4L would be the way to go. If you need to level the bed side to side as well because you carry different loads all the time, air bags may work better for you. You could use Firestone Ride-Rite...
    view full answer...

  • Will Timbrens Void Warranty of a 2015 Nissan Frontier
  • Timbrens like the part # TTORTUN4L would not void the warranty of your 2015 Nissan Frontier as long as you install them properly. When you install an aftermarket part on your vehicle you are protected by the Magnuson–Moss Warranty Act. This act states, in part, that unless the installation and the part caused a problem then the warranty cannot be voided. I recommend looking it up online.
    view full answer...

  • Timbren Helper Springs for a 2014 Nissan Frontier Desert Runner with Leaf Springs on Top of Axle
  • Timbren helper springs # TTORTUN4L are designed to fit on 2014 Nissan Frontier 4x4 trucks that have the leaf spring stack on top of the rear axle. Take a look at the installation instructions I have linked for you for more on how they install. I have also linked a review video on these springs and a link to our informational article on Timbren springs.
    view full answer...

  • Will SuperSprings Eliminate Axle Wrap On 2013 Nissan Frontier
  • With that few miles you have on your 2013 Nissan Frontier, it sounds like the suspension is the problem and I recommend you take it back to the dealer and have them check the entire system out before investing in suspension enhancements. I spoke with my contact at SuperSprings about the axle wrap. They told me that installing SuperSprings like part # SSA1MTKT, will help a bit with the axle wrap, but will not eliminate it altogether. According to the installation instructions, the...
    view full answer...

  • Will Timbren Rear Suspension Enhancement Fit 2010 Toyota Tacoma 4X4 Quad Cab Short Bed SR5 PickUp
  • My technical contact at Timbren confirmed that the Timbren Suspension Enhancement # TTORTUN4 that you referenced will work well on your 2010 Toyota Tacoma because you previously added that fourth leaf spring. The difference between the # TTORTUN4 and the # TTORTUN4L which is designed for vehicles with three leaf springs is 1/2 inch so because you added the extra leaf you can use the original part you picked out. I have attached a FAQ article covering Timbren as well as the installation...
    view full answer...

  • Timbren Rear Suspension Enhancement Recommendation for a 2016 Toyota Tacoma
  • I checked with Timbren and for your 2016 Toyota Tacoma they recommend the part # TTORTUN4L as a confirmed fit and not the # TTORTUN4. I attached a review video for you to check out as well.
    view full answer...

  • Is a Rear End Alignment Required After Installing Timbren Springs on a 2012 Toyota Tacoma 4x4
  • When installing Timbren helper springs # TTORTUN4L on a 2012 Toyota Tacoma 4x4 the vehicle only gets partially raised so the axle cannot hang freely so it would not be able to get out of alignment. But you could still go an get a rear end alignment for peace of mind if you wanted to. I have included a link to the installation instructions for this kit for you.
    view full answer...

  • Correct Timbren Suspension Enhancement Spring for 2006 Toyota Tacoma 4x4
  • For the 2006 Tacoma 2WD, the # TTORTUN4 would be the correct Timbren Aeon Spring. For 4x4 models, the # TTORTUN4 would be used on models with 4 leaves on each leaf spring, and # TTORTUN4L would be used on models with 3 leaves on each leaf spring. I've linked you to an FAQ article about the Timren Aeon Springs.
    view full answer...

  • Height of the Rubber Spring of the Timbren kit part # TTORTUN4 and # TORTUN4L
  • I went out and pulled both the Timbren kit part # TTORTUN4 and # TTORTUN4L from our warehouse to measure them for you and found that they both sit exactly 3-3/4 inches tall.
    view full answer...

  • Is a Longer Bolt Required When Installing Timbren on a Lifted Vehicle
  • We don't carry the longer bolts for when you use a lift spacer like the part # A25723-90AH00 which a Timbren like your # TTORTUN4L. You will need to find a local hardware store that can provide you with a bolt that is 1 inch longer than what you have. That's what we have had to do when we installed Timbrens on customer cars with lift spacers.
    view full answer...

  • Installation Of Timbren Rear Suspension Enhancement System On 2010 Toyota Tacoma
  • There should be no interference from the exhaust when installing the Timbren Vehicle Suspension, part # TTORTUN4L on your 2010 Tacoma. The TTORTUN4L is designed to replace the bump stops you have installed on your Tacoma. If you are installing a different system than the TTORTUN4L your question came from let me know and I can do some research to see if there is a solution that works for you.
    view full answer...

Do you have a question about this Vehicle Suspension?


At we guarantee:

Highest quality vehicle suspension for the best price.

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. This helps you get the right product the first time.
  • Every day our teams test, review, assemble and install our products. Our modern installation facilities allow our expert installers and customer service representatives to actually install and use the items we sell, so you can 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.

Information for this part was:

Photos by:
Theodore B
Expert Research:
Robert G
Expert Research:
Patrick B
Expert Research:
Michael H
Expert Research:
Jameson C
Installed by:
Cole B
Expert Research:
Jeffrey L
Updated by:
Mary E

Installations, made easy.

  • We love helping people.
  • We have the most highly trained customer service, hands-on experience, step by step videos and installation instructions. We are prepared to answer any question, give advice, or troubleshoot any problem you come across.

Fast shipping.

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.

Info for this part was:

Photos by:
Theodore B

Expert Research:
Robert G

Expert Research:
Patrick B

Expert Research:
Michael H

Expert Research:
Jameson C

Installed by:
Cole B

Expert Research:
Jeffrey L

Updated by:
Mary E

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.