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  1. Vehicle Suspension
  2. Timbren
  3. Bump Stops
  4. Towing/Load Leveling
  5. Front Axle Suspension Enhancement
  6. Light Duty
THIS ITEM IS NOT A FIT FOR
2016 Chevrolet Caprice
etrailer Installation
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Timbren

Timbren Front Suspension Enhancement System

Part Number: TTOFTAC4A
In Stock
$269.36
Retail:$316.90
You Save: $47.54
Vehicle Suspension
Not Confirmed to Fit

2016 Chevrolet Caprice

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In Use/Installed

etrailer Installation
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1,800-lb Capacity. Great for trucks with plows, these front hollow rubber springs help to 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 Front Suspension Enhancement System part number TTOFTAC4A can be ordered online at etrailer.com or call 1-800-940-8924 for expert service.
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  • Reviews (768)
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Timbren Vehicle Suspension - TTOFTAC4A

Highlights

  • Custom Fit for Your Vehicle: Mounts to existing attachment points
  • 1,800-lb Load Support: Keeps your front end level and stable when carrying heavy gear or equipment.
  • Steadier Steering and Braking: Prevents front-end sag so handling and headlight aim stay consistent.
  • Smoother Ride on Rough Roads: Hollow rubber springs absorb shock to reduce bounce and bottoming out.
  • Automatic Leveling Side-to-Side: Each spring works independently to balance uneven loads or turns.
  • No-Maintenance Setup: Replaces factory bump stops with bolt-on parts—no air lines or adjustments needed.

Features to know about

Stay Level Under Front-End Weight: 1,800-lb Suspension Support

When heavy gear or equipment weighs down the front end, the vehicle can sag and throw off steering and braking. This Timbren Front Suspension Enhancement System adds up to 1,800 lbs of load support to keep things level. The hollow rubber springs work with your factory suspension to maintain ride height and improve handling under front axle load. You get a more stable feel, better steering response, and reduced tire wear when you’re carrying serious weight up front.

Truck with snowplow illustrating Timbren front suspension support for heavy front-end loads

Smooth Out Rough Roads: Progressive Rubber Spring Action

Uneven pavement and bumps can make a loaded vehicle pitch and bounce. Timbren’s hollow rubber springs compress progressively—the folds collapse first for a softer hit, then stiffen as weight increases. That design cushions light loads while preventing bottoming out on rough terrain. The result is a smoother, more comfortable ride that soaks up road shock and keeps your suspension from taking a beating.

Illustration of Timbren rubber spring compression showing progressive resistance under heavy load

Truck on rough terrain illustrating Timbren suspension absorbing road shock and preventing bottoming out

Stay Steady in Crosswinds and Turns: Independent Support on Each Side

When you corner hard or hit uneven ground, body roll can take over fast. Each Timbren spring works independently, so one side engages only when needed. This helps keep the vehicle balanced through turns, limits sway in crosswinds, and compensates for off-center loads without affecting the opposite side. You feel more control whether you’re loaded evenly or not.

Illustration showing Timbren suspension reducing body roll and maintaining vehicle stability while turning

Get It Done Fast: Direct Bolt-On Installation

Installing load support shouldn’t turn into a big project. This system includes 2 Aeon hollow rubber springs, vehicle-specific brackets, and hardware for simple bolt-on mounting—no drilling required. It replaces the factory bump stops on the frame and is ready to work right away with your existing suspension system in good condition.

Diagram showing Timbren hollow rubber spring installation and contact with axle in loaded versus unloaded conditions

Comparison showing reduced rear sag on a loaded truck with Timbren suspension enhancement installed

Specs

Weight and Capacity

  • Capacity: 1,800 lbs

Included Components

  • Includes: 2 Aeon hollow rubber springs, vehicle-specific brackets and hardware for simple installation

Installation

  • Replaces: axle bump stops on frame
  • Drilling required: No drilling required

Compatibility and Requirements

  • Designed to work with: a suspension system that is in good working order

Warranty

  • Warranty: Limited lifetime warranty - satisfaction guarantee

Note

  • Important: Do not exceed the vehicle's weight-carrying capacity.

TOFTAC4A - Front Suspension Enhancement System with Aeon Hollow Rubber Springs by Timbren

Installation Details TTOFTAC4A Installation instructions

This Product Fits The Following Vehicles




Customer Satisfaction Score:

Ratings & Reviews

4.7

768 reviews
5 Stars
(614)
4 Stars
(109)
3 Stars
(15)
2 Stars
(6)
1 Star
(24)
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by:
Fast and easy delivery and install. Best upgrade for the money-
by:
excellent upgrade to the stock rubber bumpers in my 2016 Lexus GX 460. The stock has a tendency to drift when hit with cross winds above 60mph. This Timbren front suspension enhancement eliminated that. The SUV is more composed even when driving on rough pavement. Cornering is more secure for a tall SUV such as the 460 with high center of gravity.
It's also easy to install. Jack up the vehicle until the rubber bumper clears the metal then unscrew it. Screw the Timbren in.
by:
I put these on my vehicle (2018 4Runner) when I began pulling a trailer with a weight distribution hitch. They did their job in that the suspension felt firmer and the vehicle felt more stable. They also helped reduce the "nose drop" during braking that 4Runners a famous for.
by:
2021 Lexus GX 460


Long story short. Well worth the purchase and fairly easy to install (if you have the correct tool to remove the OEM bumpstop). I used an 18" pipe wrench to give me some leverage.
by:
Went on easy, and does what it’s supposed to do. Very little sag in the front with the plow hooked up. Before there was almost 6 inches of sag.
by:
I had to shave the bottoms to fit but the suspension still is rough on uneven pavement
by:
2007 Toyota 4Runner
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2023 Toyota 4Runner
by:
Great ordering, shipping time, cost, and supporting information. We added a snow plow and the product did everything as advertised.
Kate F. profile picture
Etrailer Expert

Kate F.

3/26/2026

Glad we had the right fit for you Tom! Where are you located, and how much snow did you get this last season?

by:
I would say that the product is a bit pricey for what it contains. The secondary bolts came with the wrong sized nuts. Other than that, they work well to support the suspension.
by:
I have a 2006 Kodiak 2 wheel drive. Timbrin firmed up the front end to much. There in full contact with the spring. I think it to stuff and I might be removing them. The install was straight forward. Parts are as expected and quality of Timbrin is great. Just not enough cush..
Heather A. profile picture
Etrailer Expert

Heather A.

5/8/2026

I hear you, and that makes sense based on what you’re describing. If the Timbrens are in constant contact, they’re basically always engaged, which is why the front end feels so stiff instead of only firming up under load. You might actually be a really good candidate for SumoSprings part # SSF-281-47 (as long as your truck is a 2WD) They’re a similar concept but made from a softer, more progressive material, so they compress more gradually instead of feeling like a hard stop. That usually gives you support when you need it without taking away all the ride comfort like you’re experiencing now. Glad to hear the install went smoothly and the quality was there, that’s pretty typical with Timbren, it just comes down to how they behave on your specific setup. What were you mainly trying to improve up front, sag, handling, or just a smoother ride overall?

Jess profile picture

Jess

5/8/2026

@HeatherA I wanted to improve the ride. Im guessing there is sag i was unaware of. I expected the timbren to be a bit more progressive in it softness?? I didn't think the rubber would be in direct contact withe the spring 100% of the time. I only have 56,000 on this truck. So little use but 20 years old. Next weekend we take it for a 300 mile trip and ill determine if there going to be removed or not. Is there a return policy if satisfactory performance is not met?
by:
2017 Chevrolet Silverado 2500
I love these things. They are worth the upfront expense. I have them on two ¾'s, one ½, and a minivan for road trips. This particular set is full-time active up front. I have a 2" leveling kit and I'm in em no matter what. Zero complaints though. Solid performance through all aspects. I don't run any front-end attachments.
by:
2006 Winnebago Sightseer Motorhome
For me surprisingly easy to install at 67 years old. Had immediate handling improvement and steering control.
Nick S. profile picture
Etrailer Expert

Nick S.

11/10/2025

That is great to hear! I am glad you were able to feel the difference right away. I am happy to hear that you were able to get them installed easily as well.

by:
I installed Timbren’s front and rear on my 2020 F53 chassis motorhome. They are by far the best suspension upgrade I have done. I had previously installed Super Steer Trac Bar, Radius Rods and Safe-T-Plus, which had helped, but not as much as I had hoped. The Timbren’s finalized the package and it drives good now.
by:
1998 Chevrolet Blazer
Easy install, didn't even need the brackets for my application. Really helped with sidesway in the wind and seems to help the front from dipping with extra weight. Haven't tried plowing snow yet but I think they will make a major difference
by:
Installation was not too hard, Install Videos explain all steps in great detail. BumpStops arrived in excellent condition and was delivered in a timely manner
Brooke M. profile picture
Etrailer Expert

Brooke M.

7/9/2025

Happy to hear that, Dan! Thank you for sharing all the photos, too. What are you towing now that you have a some extra suspension support?

Dan G. profile picture

Dan G.

7/9/2025

We tow either a Honda Pilot or SantaFe on a tow dolly
Brooke M. profile picture
Etrailer Expert

Brooke M.

7/11/2025

@DanG Ooo nice! Been on any trips recently?
by:
2023 Ford Transit Connect
It good but one side with no bump had to be put spacer but the spacer was flat so the bolt did not have a lot of thread so I grind the spacer a bit so it could stay flush otherwise this might solve the problem of outter tire wear that ford transit has will find out soon
by:
2022 Ford E-Series Cutaway
Super simple installation that took about 20 minutes. These made a HUGE improvement on steering control and bounce. Driving on the freeway is a breeze. I highly recommend this product.
by:
I watched installation videos for my FFF 53 Timbren suspension parts three times to familiarize myself with what I was going to be doing. This did help. I would say you need a little bit of experience in working on cars or trucks. This is a straightforward job with no fabricating needed. The hardware was correct. The instructions were correct. The parts fit great. I did this installation by myself. Another set of hands wouldn’t hurt but not necessary. If you’re on the fence on buying parts from Timbren, I would say go ahead and place your order.
by:
I haven/t installed them yet. I think I should have gotten a discount for the age of the "box"s the Timbrens were in. May be a credit ,, Brad
by:
Nissan Leaf
Pretty pricey but well worth it. Put these all the way around at the same time as new rear leaf springs on our c7500 topkick and it made a huge difference. It's a top heavy bucket truck and it would rock and roll just turning a corner to the point it was downright scary. Now thats greatly reduced. They also smoothed out the ride especially when loaded more than I expected.
Install was simple, perfect fit. Worst part was grinding out the rivet on the old bracket
by:
2008 Winnebago Vista Motorhome
Install was straightforward. Hardest part was getting the old bump stops out. Sway was greatly reduced on the Interstate and the rock and roll by passing semis was greatly reduced. Wish I had bought these sooner!
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See what our Experts say about this Timbren Vehicle Suspension

  • Will Spacers Be Needed To Install Timbren Suspension Enhancement On A Lifted 2021 Toyota 4Runner?
    As your 2021 Toyota 4Runner is lifted, you will indeed need to use spacers when installing a Timbren suspension enhancement system. The correct spacers will depend on if you will be using both rear and front jounces, and I have all options for your 4Runner listed below. Rear Set Up: 1/2" Bolt Timbren Rear Suspension Enhancement System 6,000 lbs # TTORSEQ Timbren Active Off-Road Bumpstops - Rear Suspension - 2,000 lbs # TABSTORSEQ Front Set Up: 3/8" Bolt Timbren Front Suspension Enhancement...
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  • Suspension Enhancement Options For 1999 Toyota 4Runner
    I do have some Firestone Coil-Rite Air Helper Springs # F4135 for your rear axle. If your springs have lost some compression and your rear end feels sloppy, these will help tighten up the back suspension to help especially if you have a trailer connected to your 1999 Toyota 4Runner. If you're bottoming out when hitting bumps/dips in the trails you will want to get the Timbren Active Off-Road Bumpstops # TABSTOR4R for the rear. This will only make a difference if your suspension is being...
    view full answer...
  • Reducing Suspension Thud Caused By Speed Bumps On a 2017 Lexus GX 460
    The Timbren Rear Suspension Enhancement System # TTORSEQ will help with your daily drive on your 2017 Lexus GX 460. The rubber springs are designed to help cushion the road shock that comes from pot holes and speed bumps. It will also stabilize your ride while you drive by providing more stability when turning. The individual springs will work independently of each other to provide support where it is needed. You can see the Timbren's installed in the video I linked below on a 2015 GX...
    view full answer...
  • Improving Ride Quality on a 2015 Lexus GX 460 Towing a Trailer on Rough Roads
    Using Timbren helper springs on your 2015 Lexus GX 460 will improve the ride quality on those rough roads. It may not completely eliminate everything but it will be a vast improvement. What is likely happening is the weight of the trailer is pulling down on the vehicle and compressing the factory suspension so that there isn't as much space for it to travel up and down. Hit a bump and it will bottom out sooner. For front help springs I recommend # TTOFTAC4A and for the rear # TTORSEQ. Another...
    view full answer...
  • Recommended Suspension Enhancement for a 2020 Toyota 4Runner TRD
    I recommend using the Timbren jounce-style suspension enhancement for your 2020 Toyota 4Runner because it is a quick installation and once you're done there is absolutely no maintenance. Since no air has to be added these kits simply work when they are needed and you don't have to think about them. For standard use you need part # TTOFTAC4A for the front and part # TTORSEQ for the rear, but if you plan on going off-road you need part # TABSTOF for the front and part # TABSTORSEQ for the rear.
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  • Timbren Front & Rear Bumpstop Options for 2007 Toyota FJ Cruiser 4x4
    The Expert Answer that you are referring to is for a 2012 Toyota Tundra 4x4. The 2012 Tundra has different rear bumpstops than your 2007 FJ Cruiser 4x4. The part # TABSTORSEQ that fits your Cruiser will not fit on the Tundra. Timbren offers a few different options for you to add some suspension enhancement for your Cruiser and it all depends on how you plan on using it. The Rear Off-Road Bumpstops # TABSTORSEQ are rated for 2,000 lbs whereas the Timbren Rear Suspension Enhancement System...
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  • Weight of Timbren Springs for 2016 Lexus GX 460
    The Timbren Suspension Enhancement System # TTORSEQ that you referenced for the rear axle of your 2016 Lexus GX 460 weighs just about 6 pounds total (3 pounds per spring). The Front Timbren Suspension Enhancement System # TTOFTAC4A for your vehicle only weighs about 2 pounds in total. I have attached the installation instructions for these components that you can also take a look at.
    view full answer...
  • How Do Timbren Springs Install on the Front Axle of a 2004 Lexus GX 470
    We have not yet had the chance to install Timbren front suspension enhancement springs # TTOFTAC4A so we do not have a video. We do have the instructions which I have linked for you below. Installation is fairly straight forward. There are 4 steps: 1) Raise vehicle allowing the axle to hang freely. 2) Where four bump stops exist, remove the rear bump stop. 3) Mount Timbren assembly using existing holes and Timbren supplied fasteners. 4) Lower vehicle.
    view full answer...
  • Timbren Suspension Enhancement for a 2011 Toyota FJ-Cruiser Trail Edition
    Adding suspension enhancement like Timbrens will help with sag and increase stability and ride quality. If your 2011 Toyota FJ Cruiser is a 4-wheel drive model, for the front you can use # TTOFTAC4A that you have referenced. There is no option for the front if it is a 2-wheel drive model. For the rear if it is 2- or 4-wheel drive use # TTORSEQ. I have included links to the instructions for both sets for you to view. I have also included a link to our FAQ article on Timbren suspension enhancemen...
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  • Will Timbren Suspension Help Level a 2007 Toyota FJ Cruiser That Has More Weight on Passenger Side
    The Timbren suspension enhancement will replace the axle bump stops on your 2007 Toyota FJ Cruiser. They will work independently front and rear, and side to side. So, when you are carrying a heavier load on the passenger side of the vehicle it will compress the hollow rubber spring and become more rigid as the load is applied. This will help keep the vehicle from leaning heavily to that side. It will not affect the empty ride of your FJ Cruiser. The Timbren suspension has a weight capacity...
    view full answer...

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