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Timbren Rear Suspension Enhancement System
Part Number: TTORTAC4A
In Stock
$269.36
Retail:$362.73
You Save: $93.37
2023 GMC Yukon XL
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Timbren Vehicle Suspension - TTORTAC4A
Highlights
- Custom Fit for Your Vehicle: Mounts to existing attachment points
- 6,000-lb Load Support: Keeps your truck level and steady when towing or hauling heavy cargo.
- Better Ride Stability: Cuts down on sway, roll, and bounce for smoother, more controlled handling.
- No-Maintenance Design: Rubber springs work automatically with no air lines, valves, or adjustments.
- Smoother Over Rough Roads: Absorbs bumps and road shock to protect your suspension from bottoming out.
- Simple Bolt-On Install: Replaces factory bump stops using included brackets and hardware—no drilling.
Features to know about
Stay Level and Confident Under Load: 6,000-lb Rear Suspension Support
When hauling or towing causes rear-end sag, these hollow rubber springs take on the extra weight so your ride stays level and stable. With a 6,000-lb capacity, the Timbren Rear Suspension Enhancement System adds solid support to your factory suspension, keeping steering, braking, and handling consistent even with heavy loads in the bed or on the hitch.
Smooth Out Rough Roads: Rubber Springs That Absorb Shock
Bumpy roads and uneven terrain can make a loaded truck feel harsh. The hollow rubber design cushions bumps and absorbs road shock, softening the ride whether you’re towing or carrying gear. The springs let your leaf suspension move freely under light loads, then firm up as more weight is added for a comfortable ride that adapts to what you’re carrying.
Stay Steady in Crosswinds and Turns: Independent Spring Action
Sharp corners or gusty highways can throw off balance when hauling weight. Each spring works independently to keep both sides planted, cutting down body roll and sway. That independent action also helps when loads aren’t perfectly centered, keeping your truck and trailer stable through turns or uneven ground.
Install It Once and Drive: Simple Bolt-On Setup
No air lines, compressors, or adjustments—just bolt it on and go. The kit replaces your factory bump stops with custom-fit brackets and two Aeon hollow rubber springs that mount above the rear axle. With no drilling required and all hardware included, it’s an easy upgrade that gives long-term support without maintenance or air pressure checks.
Specs
Weight and Capacity
- Capacity: 6,000 lbs
Warranty
- Limited lifetime warranty
- Satisfaction guarantee
TORTAC4A - Rear Suspension Enhancement System with Aeon Hollow Rubber Springs by Timbren
This Product Fits The Following Vehicles
- 1975 - 1995 Toyota Pickup Pickups
- 1993 - 1998 Toyota T100 Pickup
- 1995 - 1997 Toyota Tacoma
- 1998 - 2004 Toyota Tacoma excluding Pre-Runner
- 1998 - 2004 Toyota Tacoma Pre-Runner
Customer Satisfaction Score:
89% were satisfied with this product
11% of customers were not satisfied
- Arrived Damaged
- Wrong item was ordered
- etrailer mistake
Ratings & Reviews
4.7
7294 reviews
by:
DaveInReno
12/17/2013
2000
Toyota
Tacoma
Having purchased a cargo trailer, I thought it might be wise to beef-up the rear suspension on my 2000 Tacoma. I found the Timbrens on etrailer, and it sounded like they might work well, so I purchased a set and installed them. According to the instructions, there should be about a 1/2" gap between the top of the springs, and contact with the bottom of the Timbren - unless you have a CAP on the truck! The gap pretty much evaporated because of the fiberglass Leer cap. So, I'm getting contact a lot of the time. Result is, my ride has become stiffer than I'm used to, but not so much that it bothers me. Like my wife said, " It's a truck! Hello!!" (OK, I'm satisfied with the product.)
Daveinsedrowoolley
1/12/2015
A year later and 5,304 miles pulling the trailer, I think the Timbrens are a good investment. With a typical pull of 2,555 lbs of trailer and load, and approximately 300 lbs of tongue weight, Im finding the truck actually rides better than it does with no load. And, theres no maintenance whatsoever!
by:
Farrier Mat
10/01/2018
2001
Toyota
Tacoma
Just what the truck asked for...
I’m a Farrier, I carry a full workshop in the bed of my truck 24/7. I drive a 2001 Toyota Tacoma 4x4. After a couple months I redid the entire front and rear suspension and added heavy duty rear leafs. After about a year of driving and also adding more tools the truck began to sag a little bit. Ofcourse, the first thing anyone suggested was “airbags” but they didn’t know the use of the truck or where the truck goes from day to day. Being a Farrier, I travel on everything from paved freeways to down and dirty “4lo” back roads. I needed a maintenance and care free system that would allow for over extension and hold the extra weight of my tools and sometimes even a trailer. I did a ton of research and even talked to the Technician Staff at each company. I ultimately decided to go with Timbren SES Kit. It’s easy to install, maintenance free, free floating, and has the best warranty in it’s category. Since I have a custom setup (Ubolt Flip Kit from AllProOffroad) I had to design and build some landing pads to allow for an “interference free” contact with my system. After the first day of working, I am COMPLETELY satisfied with its performance and how my truck feels and drives.
As for ”Etrailer” I am very happy with all the information and excellent customer service. I received my parts 2 days before it’s orignal date which makes me super Happy!
I’m a Farrier, I carry a full workshop in the bed of my truck 24/7. I drive a 2001 Toyota Tacoma 4x4. After a couple months I redid the entire front and rear suspension and added heavy duty rear leafs. After about a year of driving and also adding more tools the truck began to sag a little bit. Ofcourse, the first thing anyone suggested was “airbags” but they didn’t know the use of the truck or where the truck goes from day to day. Being a Farrier, I travel on everything from paved freeways to down and dirty “4lo” back roads. I needed a maintenance and care free system that would allow for over extension and hold the extra weight of my tools and sometimes even a trailer. I did a ton of research and even talked to the Technician Staff at each company. I ultimately decided to go with Timbren SES Kit. It’s easy to install, maintenance free, free floating, and has the best warranty in it’s category. Since I have a custom setup (Ubolt Flip Kit from AllProOffroad) I had to design and build some landing pads to allow for an “interference free” contact with my system. After the first day of working, I am COMPLETELY satisfied with its performance and how my truck feels and drives.
As for ”Etrailer” I am very happy with all the information and excellent customer service. I received my parts 2 days before it’s orignal date which makes me super Happy!
by:
J.J.G.
02/28/2021
I own a 2002 Toyota Tacoma crew cab, with a leer topper, I work in construction and carry my tools all of the time.
I’m very pleased with it and it’s been the best I ever had.
the bolt should be galvanized or stainless, the bolt is getting a bit of rust after one year.
Even then I would recommend this.
Thanks
I’m very pleased with it and it’s been the best I ever had.
the bolt should be galvanized or stainless, the bolt is getting a bit of rust after one year.
Even then I would recommend this.
Thanks
by:
John M
06/24/2020
This worked great and was easy to install. No impact to driving quality when unloaded. Does make a nice improvement to ride quality when loaded and the rear end of the truck does not sag under the load.
One issue is the bolts were about 1/2" too short, the nylock washer barely makes it onto the threads.
One issue is the bolts were about 1/2" too short, the nylock washer barely makes it onto the threads.
by:
Anthony
11/08/2025
Products, pricing, and shipping is always spot on! Thanks again etrailer!
by:
Brian
11/27/2018
2004
Toyota
Tacoma
Installed these on my 2004 Tacoma 4 door, 4WD. They were great with a trailer on back and handled the load great. Without the load of a trailer it is like riding a hard tail Harley. In the process finding something different to help the sagging springs.
Mike L.
11/28/2018
The Timbren Aeon springs are meant to be used on a suspension thats in good repair. Normally, the vehicles ride will be completely normal until the rear suspension is loaded either from cargo or by the tongue weight of a trailer, at which time the suspension will compress far enough that the Timbren springs come into play.
by:
Alex
11/15/2021
Toyota
Tacoma
The overall product design and usage has been excellent. Carrying heavy loads is easy and my '01 Tacoma handles bumps and ranch roads much better loaded down. I'm running a 3-in lift so there is no contact from the rubber springs and unless I'm heavily loaded, works great for off-roading. I had to grind the corner off one of the mounting plates to make room for my brake line,and get creative about starting the nuts inside the rubber springs but it was well worth it.
by:
James
11/10/2016
1993
Toyota
Tacoma
This is a great product for when i am towing. It really beefs up the rear suspension and prevents the proverbial Tacoma sag. However, since it is not easily removable, it stays in place all the time. It makes the ride rough, and you can feel every little bump. No give. I knew this going in, but I think air shocks would have been a better decision. Overall happy with the performance.
by:
Gunnar
08/16/2024
They didn't really work for me. The truck (93 Toyota Pickup) ended up riding completely on the Timbrens and not the springs making for a super bouncy ride. I ended up taking them off after a month.
by:
CT
11/18/2014
2004
Toyota
Tacoma
Haven't installed yet but the customer service and delivery was excellent so far. I called Timbren prior to ordering to double check I was selecting the correct product for my 2wd Tacoma, which actually needs the 4wd drive version the the Timbren bumpstops bc of the TRD model. Timbren immediately picked up the phone and quickly assisted me.
by:
Richard
10/31/2017
These are fantastic. All Timbren Suspension Products I have used work great and noticeably improve handling and performance.
by:
Brad
03/06/2023
I can always count on etrailer and Timbren for products I can count on, delivered on time!
by:
Mac
12/28/2017
Great product, great service. No more blinding oncoming traffic when I’m loaded or pulling my boat. Truck stays nice and level
by:
Sam Lassegard
03/28/2015
Timely shipping! Project is completed, Thanks.
by:
SteveJ
03/04/2018
This product has worked extremely well. Ride is a little rougher but very stable when towing our teardrop and kit or hauling tools to worksite. I do have experience with airbags but feel a more stable ride in corners, etc with this product
by:
Tommie
06/24/2021
Very straight forward. Initially I was given a date that was a little farther out than I had planned. Was offered a similar product that could be shipped immediately. I appreciate that attitude. Offer a solution to the problem. I chose to wait. Product showed up as they said it would.
Excellent service.
Excellent service.
by:
William
08/29/2023
Made the ride horrible. Tons of vibrations when weight on truck
by:
Adrian
05/19/2026
by:
Timothy
02/13/2024
by:
Doug
02/10/2021
by:
Richard
05/17/2021
by:
Michael
05/20/2021
1999
Toyota
Tacoma
by:
Jim - On a ranch near San Antonio
09/20/2026
Installed the Timbren TFR250SDJ on my 2025 F-250 Platinum Plus 4WD Short Bed with 6.7 HO Powerstroke. Fit perfectly. It takes a few minutes to get the bags attached to the base. It seems like the bolt is too long but I used a vise to hold the unit while I tightened it down more and cinched the bag to the base. So if it seems it wont get tight enough and is still loose, find a way to secure the base... there's still a few more turns.
Attaching to the truck takes a few minutes to remove the OEM (2 nuts) and a few minutes to install the Timbren SES. I added about 45 minutes by dropping one of the nuts, which I finally found inside the shock absorber bracket!!
I used a hand socket but would recommend air or power tools, if you can get to the nuts, but it can be done manually. Probably took me a few extra minutes with a socket wrench because of limited space, and I'm old!
I have not tested the SES under load yet, but I was really more concerned with the ride unloaded.I ended up with a gap right at 1" between the peg and bottom of the SES. Some reviews said the unloaded ride worsened. So I drove to the nearest small town with horrible streets, bumps, holes, broken concrete, sewer covers 3" below the asphalt, etc. On the highway, the ride was perfect, completely unaffected. On my bad road obstacle course, I thought the ride improved significantly. So I think the system will give a better ride unloaded. It was a little stiffer, less roll, and smoother. It was not "bouncy" or jarring, like some reviews mention. Very smooth and felt beefier on bad roads.
I'll update after I've driven loaded. I tow a 12,000# 2025 Rockwood TT 36' with a ProPride 3P hitch. We put 7,000 miles on it across 15 states this past year, so I've definitely got a "before" baseline using the OEM bumpers.
The ordering process was great. Naomi D had great product knowledge. At first I thought I was talking to my granddaughter, but after putting her through the paces, It felt like I was getting sage advice from my Grandfather. e-Trailer seems to really invest in their customer service reps knowledge base. Also completely satisfied with the order process and delivery. They were able to mail to our PO Box, which seems to be a problem for most (our physical address is a gate on the side of a highway, with cows on the other side).
100% satisfied so far and would recommend both e-trailer and Timbren to a friend. Will update once I've done some towing, but can say the unloaded ride is unaffected or improved for my application. So far, very happy.
Attaching to the truck takes a few minutes to remove the OEM (2 nuts) and a few minutes to install the Timbren SES. I added about 45 minutes by dropping one of the nuts, which I finally found inside the shock absorber bracket!!
I used a hand socket but would recommend air or power tools, if you can get to the nuts, but it can be done manually. Probably took me a few extra minutes with a socket wrench because of limited space, and I'm old!
I have not tested the SES under load yet, but I was really more concerned with the ride unloaded.I ended up with a gap right at 1" between the peg and bottom of the SES. Some reviews said the unloaded ride worsened. So I drove to the nearest small town with horrible streets, bumps, holes, broken concrete, sewer covers 3" below the asphalt, etc. On the highway, the ride was perfect, completely unaffected. On my bad road obstacle course, I thought the ride improved significantly. So I think the system will give a better ride unloaded. It was a little stiffer, less roll, and smoother. It was not "bouncy" or jarring, like some reviews mention. Very smooth and felt beefier on bad roads.
I'll update after I've driven loaded. I tow a 12,000# 2025 Rockwood TT 36' with a ProPride 3P hitch. We put 7,000 miles on it across 15 states this past year, so I've definitely got a "before" baseline using the OEM bumpers.
The ordering process was great. Naomi D had great product knowledge. At first I thought I was talking to my granddaughter, but after putting her through the paces, It felt like I was getting sage advice from my Grandfather. e-Trailer seems to really invest in their customer service reps knowledge base. Also completely satisfied with the order process and delivery. They were able to mail to our PO Box, which seems to be a problem for most (our physical address is a gate on the side of a highway, with cows on the other side).
100% satisfied so far and would recommend both e-trailer and Timbren to a friend. Will update once I've done some towing, but can say the unloaded ride is unaffected or improved for my application. So far, very happy.
Robin H.
9/22/2026
Thanks for taking the time to share such a detailed review and all of the pictures! The unloaded ride is a concern we hear fairly often with SES upgrades, so your experience with the 1" gap and rough-road testing will be really helpful to others considering these for their F-250. We appreciate the kind words about Naomi and our team as well. Looking forward to your update once you get some miles on them with the Rockwood!
by:
Adam
08/12/2026
I'm suitably impressed with the difference i feel.
I have about 250 lbs. of static load with my topper and Decked cargo system. This put my install gap with no spacers just under the reccomended 1 inch minimum.Then add a couple hundred more pounds hauling music gear 100 shows a year, and the stop is resting on the axle.
I feel the absorption of the Timbren material is better than the flimsy stock bump stops. More cushion.
Where i really feel the difference is in the stabilty of excessive side sway when turning while loaded.
I have a gig coming up that will involve some unpaved mountain roads to get there so I think i will have a real goid idea of how these Timbren's will perform.
Instalation took me about an hour at 11 p.m.
The product it of the highest quality in design and build.
And Etrailer is a company that I would not hesitate to buy from in the future.
Thanks Dee Dee.
You rawk!!
I have about 250 lbs. of static load with my topper and Decked cargo system. This put my install gap with no spacers just under the reccomended 1 inch minimum.Then add a couple hundred more pounds hauling music gear 100 shows a year, and the stop is resting on the axle.
I feel the absorption of the Timbren material is better than the flimsy stock bump stops. More cushion.
Where i really feel the difference is in the stabilty of excessive side sway when turning while loaded.
I have a gig coming up that will involve some unpaved mountain roads to get there so I think i will have a real goid idea of how these Timbren's will perform.
Instalation took me about an hour at 11 p.m.
The product it of the highest quality in design and build.
And Etrailer is a company that I would not hesitate to buy from in the future.
Thanks Dee Dee.
You rawk!!
Christopher H.
8/14/2026
Love hearing this! Really appreciate the detailed feedback and photos. That extra stability when you're loaded up can make a huge difference. And installing them at 11 at night—that's commitment. Hope they treat you just as well on those mountain roads. Safe travels and we'll definitely make sure Dee Dee gets the shoutout.
by:
Ryan
08/16/2026
2024
Toyota
Tundra
Timbren Spring Helpers were exactly what I needed on my Tundra plus a spacer kit since I have a 3” TRD lift. They were packaged neatly, with proper hardware, and excellent instructions! They absolutely do exactly what they are supposed to do! Truck rides much better and helps level out the load!
Lazer S.
8/19/2026
Glad to hear they are working well for you, Ryan! Now that they are on, where you headed?
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7294
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See what our Experts say about this Timbren Vehicle Suspension
- Are There Air Bags for a 1991 Toyota PickupI do have an option for you but we don't offer air bags for a 1991 Toyota Pickup. Instead, I recommend upgraded jounce bumpers like the Timbren Rear Suspension Enhancement System part # TTORTAC4A which offers a bolt-on fit and works well to reduce sag while towing or hauling. They also don't require maintenance like air bags do.
view full answer... - Lift Spacers For Timbren Suspension Enhancement On a 2002 Toyota TacomaDue to the design of the Timbren Rear Suspension Enhancement System # TTORTAC4A on your 2002 Toyota Tacoma the screw that would normally sit in that position is welded on as you do not have access to the head of the screw when it is installed on your Tacoma. You have a couple options to get your Timbrens to function properly on your Tacoma. First you can drill out the welds and have longer screws welded in their place. This would allow you to use the 1" Spacers # A25723-90AH00 or 1/2"...
view full answer...
- How Tall are the Springs in Timbren Helper Spring Kit TTORTAC4A for a 2004 Toyota TacomaThe helper springs in Timbren kit # TTORTAC4A are 5-1/8 inches tall by themselves. The overall height of the whole assembly will be a little taller. Does your 2004 Toyota Tacoma have a suspension lift?
view full answer... - What Suspension Kit to Correct Sagging Rear End on 2002 Toyota Tacoma During Occasional TowingAs you noted there are several different types of rear axle suspension enhancement products for your 2002 Toyota Tacoma: air-springs, rubber bump-stop springs and helper leaf springs such as the Super Springs # SSA18. Air-spring kits are more complex to install and require regular checks to maintain their required minimum pressure, but offer adjust-ability to suit changing tow and cargo loads. Rubber springs are not adjustable but do offer progressive resistance as the load increases,...
view full answer... - Rear Suspension Enhancement Recommendation for a 1995 Toyota TacomaFor your application with an extra leaf spring already installed on the 1995 Toyota Tacoma, I would go with the Timbren Rear Suspension Enhancement System, # TTORTAC4A. It will not affect the empty ride of the vehicle, the springs get more rigid under load for more support, they are easy to install, and they are very cost effective. Since you will be on a lot of back roads, the added bonus of these springs acting as additional shocks will help out with ride quality as well. I have included...
view full answer... - Rear Suspension Enhancement Options for 2004 Toyota Tacoma 4X4 Double Cab with Camper ShellThere are several types of rear suspension enhancement kits available for your 2004 Toyota Tacoma 4X4. These include adjustable air springs, jounce-style rubber or urethane springs and helper leaf springs. The link provided will show you all available rear-axle suspension kits for your 2004 Tacoma 4WD. These vary in price and installation complexity. Note that none of these products will increase the weight-carrying capacity of your vehicle. Air-spring kits are more costly and complex...
view full answer... - How Much Will Timbren Rear Suspension Enhancement TTORTAC4A On 2000 Toyota Tacoma Compress?I reached out to my contact at Timbren and the Timbren Rear Suspension Enhancement System # TTORTAC4A you were looking at for your 2000 Toyota Tacoma will not hardly compress at all until you reach 4800lbs on the rear suspension. After 4800lbs you will start to experience some sagging, and if you go past 6000lbs you will experience sagging of around 2-3". Since your truck does not have a payload rating of over 4800lbs, you shouldn't notice hardly any sagging. I included a video of the...
view full answer... - Can Timbren Suspension Kit Install on 2003 Toyota Tacoma with 2.5 inch LiftTimbren does make spacers like the part # A25723-90AH00 for a 1 inch spacer and # TA25722-90P00 for a 1/2 inch spacer which you can use to take up extra space created by lift kits so that you can still use their suspension enhancement kits like the # TTORTAC4A that you referenced. You'd need to use an amount of spacers that takes up the added distance created by the lift. So in this case you'd need two 1-inch spacers and a 1/2 inch spacer per side of the vehicle.
view full answer... - Recommended Suspension Enhancements for a 2000 Toyota Tacoma TRD SR5 4 Wheel DriveThe air spacer kit like # F2366 is a necessity and allows air springs like # F2304 to be installed on vehicles with 2-inch lift. A union T-fitting # F3025-1 will route two incoming air lines into one outgoing line or splits one incoming air line into two outgoing lines. You can use with 1/4 inch push-to-connect air lines. Adding air bags like # F2304 will help maintain even load distribution with air pressure and leveling off-center loads. Another suspension enhancement option you...
view full answer... - Timbren Suspension Kit Recommendation for 2002 Toyota Tacoma The Timbren kit part # TTORTAC4A would be what you would need.
view full answer... - Best Rear Axle Suspension Kit for 1998 Toyota Tacoma 4x4 SR5 Extended BedThe Super Springs Custom Suspension Stabilizer and Sway-Control Kit you referenced, part # SSA7, is a fit for the 2-wheel-drive non-Pre-Runner version of the 1998 Toyota Tacoma, but this kit will not fit your 4X4. A comparable product from Super Springs that will fit the 4WD non-Pre-Runner is part # SSA18. This bolt-on kit installs above your factory leaf springs without drilling required. Helper leaf springs like these are a good choice for frequent towing or hauling of heavy loads. They...
view full answer... - Timbren Rear Suspension Enhancement System for a 2003 Toyota Tacoma Pre-RunnerThe Timbren Rear Suspension Enhancement System part # TTORTAC4A is a confirmed fit for the Pre-Runner edition of the 2003 Toyota Tacoma and will work well for you. The Timbren's will maximize safe load carry capacity (up to 6,000 lbs), improve stability, and increase the wear life of your existing suspension components.
view full answer... - Replacement Bolt For Timbren Suspension System # TTORTAC4A on 1999 Toyota TacomaThe Timbren Rear Suspension Enhancement System # TTORTAC4A for your 1999 Toyota Tacoma uses 4 FHSCS 3/8" x 1-1/2" fine thread UNC grade 5 bolts. The Timbren part number F12063-653 can be ordered from Timbren if you want the exact part from the manufacturer as we currently do not carry this as a replacement part.
view full answer... - Recommended Rear Suspension Enhancement for 1998 Toyota Tacoma 4X4 The Timbren Rear Suspension Enhancement System # TTORTAC4A that you referenced is confirmed to fit your 1998 Toyota Tacoma 4X4. This jounce-style spring system will work great on your truck and is designed to handle exactly the kind of load you are putting in the bed, and resolve the exact issues you are experiencing as a result of this load. These 6,000 pound capacity springs will provide the needed additional support for the truck's rear suspension to help eliminate sag and increase stability...
view full answer...
Do you have a question about this Vehicle Suspension?
Info for this part was:
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At etrailer 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.
Patrick B.
12/18/2013
Keep in mind that the gap Timbren refers will diminish as the springs wear. Since the truck is a 2000, it probably has some miles on it and if it has hauled heavy loads in the bed or has pulled a trailer, then the leaf springs may just be worn.