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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
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1998 Chevrolet C/K Series Pickup
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Timbren

Timbren Suspension Enhancement System - Severe Service - Rear Axle

$269.36
Retail:$316.90
You Save: $47.54
Vehicle Suspension
Not Confirmed to Fit

1998 Chevrolet C/K Series Pickup

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7,000-lb Capacity hollow rubber springs sit above the rear axle to help stabilize and level your vehicle. Provides a comfortable ride by absorbing road shock and improving stability. Ideal for trucks with slide-in campers or an in-bed salt spreader. Great Prices for the best vehicle suspension from Timbren. Timbren Suspension Enhancement System - Severe Service - Rear Axle part number TFRTT150D can be ordered online at etrailer.com or call 1-800-940-8924 for expert service.
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Timbren Vehicle Suspension

Highlights

  • Custom Fit for Your Vehicle: Mounts to existing attachment points
  • 7,000-lb Load Support: Keeps your truck level and steady when hauling or towing heavy gear.
  • Smoother, Safer Ride: Rubber springs absorb road shock to cut bounce and harshness under load.
  • Better Steering Control: Reduces rear sag so braking and handling stay predictable and confident.
  • Handles Off-Center Loads: Each spring works on its own side to help even out uneven cargo weight.
  • No-Drill DIY Setup: Bolts in place with custom brackets for quick driveway installation.

Features to know about

Stay Level and Confident Under Heavy Loads: 7,000-lb Rear Suspension Support

When the rear end squats under a heavy load, steering and braking can quickly feel uncertain. This Timbren Suspension Enhancement System adds up to 7,000 lbs of rear axle support using hollow rubber springs that sit above the axle. The springs get more rigid as weight increases, keeping your vehicle level and stable when hauling or towing. With the extra support, handling feels more controlled and the front tires maintain proper traction for safer driving.

Truck with heavy bed load showing rear sag and raised front, demonstrating the need for Timbren Suspension Enhancement System to level vehicle stance.

Smooth Out Rough Roads and Heavy Hauls: Hollow Rubber Spring Cushioning

Big loads don’t have to mean a rough ride. The Aeon hollow rubber springs absorb most of the road shock so bumps and potholes don’t transfer through the chassis. The design allows normal suspension travel under light loads for a comfortable ride, then stiffens progressively as weight is added. That means you get the cushion you need when empty and firm control when loaded without bottoming out on rough roads.

Empty pickup truck driving on rough road illustrating shock absorption benefits of Timbren rubber suspension springs.

Diagram comparing loaded versus unloaded Timbren rubber spring installation showing one-inch clearance above vehicle axle.

Compressed Timbren hollow rubber spring showing progressive folding design that stiffens under heavy vehicle loads.

Stay Steady in Crosswinds and Turns: Independent Spring Action

Uneven loads or sharp turns can push one side of your truck harder than the other. Each Timbren spring works independently to support its side of the vehicle, reducing body roll in quick maneuvers or on off-center loads. When a trailer starts to sway or wind gusts hit, this independent action helps keep both vehicle and trailer aligned so handling stays composed and predictable.

Timbren suspension system preventing vehicle sag, roll, and sway by stabilizing each side independently during turns or uneven loading.

Tow vehicle with trailer sway example showing how Timbren suspension helps control and minimize trailer movement for safer towing.

Install It Once and Get to Work: No-Drill Bolt-On Brackets

Getting more suspension support doesn’t have to be complicated. This kit includes custom-fit brackets and hardware that bolt directly onto the frame rails with no drilling required. Once mounted, there are no air hoses, compressors, or adjustments to worry about—just reliable rear-end support every time you load up or hitch a trailer.

Specs

Weight and Capacity

  • Capacity: 7,000 lbs

Compatibility and Requirements

  • Do not exceed your vehicle's weight-carrying capacity
  • Designed to work with a suspension system that is in good working order

Warranty

  • Limited lifetime warranty - satisfaction guaranteed

FRTT150D Timbren SES with Aeon Hollow Rubber Springs - Rear Axle - Severe Service

Item # TFRTT150D

Installation Details TFRTT150D Installation instructions

This Product Fits The Following Vehicles




Video of Timbren Suspension Enhancement System - Severe Service - Rear Axle
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Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.




Video Transcript for All About the Timbren Suspension Enhancement System-TFRTT150D

Hello everybody, this is Jeff at etrailer.com. Today we're gonna take a look at this Timbren severe service rear Suspension Enhancement System. Now this is a custom fit part. It is designed to fit the 2004 to 2008 Ford F-150 trucks and the 2004 to 2008 Lincoln and Mark LT vehicles. Now in a custom fit part like this, I do like to recommend for you to go to our website, use the fit guide, put in your year model vehicle, and it'll show if this a work through application. Now this kit here will improve the suspension, the handling, and the safety of your vehicle.

This is a severe service kit and these are recommended when you're using a top heavy load, like a slide in camper, a salt spreader on your vehicle. Any application that requires maximum stability, meaning reducing the roll and sway calls for a severe service upgrade. Now, most rubber springs used on the trucks are double convoluted, providing a perfect blend of capacity and ride quality. But the rubber springs used on the severe surface are a single convoluted Aeon spring. The single convoluted springs are shorter and wider.

You can see if I move these two pieces, here's your spring itself. They are shorter and wider. They're designed to resist weight more aggressively, and the result is reduced ride quality exchange for more stability. They do work independently side to side. They'll help compensate for any off center loads, and they do reduce body roll when you're swerving and turning corners.

They will act as shock absorbers taking the brunt of any bumps and rough roads, which will help extend the life of your vehicle suspension. Now this part will include everything laid out here on the table. It'll include the two Aeon rubber springs, the two spacers, and then the vehicle specific brackets and the hardware for a simple installation. Comes with a nice set of instructions that'll describe how this installs and goes together, and it installs directly onto the frame and replaces the bump stop. No drilling is required.

A few specs on this kit. The capacity is 7,000 pounds. Now, even though you're increasing the spring rate by adding this upgrade, this does not increase the gross vehicle weight rating of your vehicle. So you still wanna make sure not to exceed the manufacturer's recommended weight limit. And this kit is designed to work with a suspension system that is in good working order. But that should do it for the review on this Timbren severe service rear Suspension Enhancement System.

Ratings & Reviews

4.5

965 reviews
5 Stars
(717)
4 Stars
(137)
3 Stars
(29)
2 Stars
(34)
1 Star
(48)
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by:
So far so good. Easy install, well see how it does with the camper on it.
by:
2006 Ford F-150
Only reason I didn't give 5 stars is that I had a really hard time getting the bolt started in the frame, A quarter inch longer bolt would have really been nice. I had to start with a different longer bolt to pull the washer into the rubber bushing before I could get the supplied bolt started.
Darin profile picture

Darin

7/5/2022

After a year the bushings are holding up great. They really help the stability of the truck when pulling the camper

by:
by:
by:
2005 Ford F-150
by:
by:
Works well on my F250 6.75 bed with a 1700lb dry Capri Retreat camper. Solved 4" squat without airbags. Eliminated sway in high winds.
Heather A. profile picture
Etrailer Expert

Heather A.

5/26/2026

Wow, that is exactly what we love to hear about these springs! That is a serious camper. Any plans with it this summer?

by:
I have Timbrens on an F350. We have a heavy truck camper that we use multiple times a year. I've had both these and airbags on multiple rigs over the years and the Timbrens are superior by far especially because they don't leak at the connections, valves or bags or work loose. They also help with the sway.
There is no pump or electrical involved. Airbags have just too many parts and potential points of failure guaranteed to happen away from home on a muddy road. Once Timbres are installed you're done. In this case the less expensive and simpler solution is the better one!
Tom E. profile picture

Tom E.

8/9/2026

Still working great! No issues. Other than being dirty, they look and perform like new.

Jerred H. profile picture
Etrailer Expert

Jerred H.

8/9/2026

@TomE That's great to hear Tom! Thanks for coming back after a year and sharing that feedback.
by:
2012 Toyota Tundra
Time will tell! Fast and easy install on my 2012 custom flatbed tundra. Hoping this will help when I overload my truck. I have about 900 lbs of extra weight on my truck at all times + Old man Emu heavy duty leaf springs.
by:
Really won't know until I put my truck camper on the vehicle. Product looks and feels quality, we'll see about performance. Installation instructions could be a bit more detailed.
James profile picture

James

7/27/2026

So far they have been fine. They are part of my suspension upgrades, along with stable loads and sway bar. I wasnt worried about harder ride when camper off, I wanted best suspension when camper was on. I would definitely recommend them.

by:
2006 Ford F-350 Super Duty
It was tough to remove the stock bump stops on a 06 f350 the new timbrens were straight forward easy to install. They are quite expensive for what they are! I won’t be putting the slide in camper back on until spring so I really won’t know how they will perform but I hope they work as advertised.
by:
Ford F-350 Super Duty
I ran air bags on my previous trucks when pulling my 5th wheel and trailers, but these worked just as well without the expense. I run them on a F350. Great product!!!
by:
2011 Ram 1500
The installation was pretty simple and I’m sure they will work out fine, but I won’t know for sure until the next time I have to take my tractor on the trailer or load up my ATV.
by:
2023 Ford F-350 Super Duty
The Timbrens arrived and install was a breeze. Look to be of very good quality. I went with the severe duty because my truck is always loaded up with camping supplies, electric bikes tools…. The topper on back along with the slide tray are added weight. I pull a 7k travel Trailer with 650-700 pounds on hitch. The Timbrens are barely touching the axel without the trailer. I really enjoy dealing with etrailer. They answer all your questions and always put the customer first. It’s kind of like your project is their project.
Charles profile picture

Charles

2/8/2026

Excellent product. Does exactly what they were designed to do. I removed the sever duty extension. Now the ride is soft when unloaded. But yet smooth when towing or loaded heavy.

Andrew N. profile picture
Etrailer Expert

Andrew N.

2/9/2026

@Charles Nice! I'm glad you are still enjoying them. I had the timbrens on my old Nissan Titan and they did great for the 5 years they were installed for towing my car hauler. I'm curious though, when you say you removed the severe duty extension, are you meaning the rubber spacer?
Charles profile picture

Charles

2/9/2026

@AndrewN Yes sir, with the extra rubber in the ride when empty was a little rough. IMG_6417.jpeg
by:
2016 Ram 1500
They are difficult to seat. Soapy water does nothing to help. I had to spray with silicon,jack up the back of the truck and place 2x4's between the bump stop and the axle,NUMEROUS TIMES.
Once I towed my 5th wheel I noticed the difference. When unloaded, the ride is normal.
by:
Love my Timbrens. Had airbags and was tired of leaks and the need to adjust air pressure. Easy to install!
by:
It would be helpful if the kit contained all the hardware to attach it to the truck. I purchased this to replace a Loadlifter 5000 that was installed 9 years ago. I don’t have the OEM clip and nuts that goes into the frame. It took hours of searching before I finally figured out I could find it on the Ford suspension schematics.
by:
Ram 3500
Do not keep vehicle level. 800 Lb. tongue weight trail still lowers rear of truck approximately 4 inches. 3500 GMC Dually 4x4

My advice is don't be lazy just go with air bags.

They say satisfaction guaranteed defiantly not satisfied and will be less than happy if they charge me a restocking fee on a bad product. I should have known better.
by:
My truck has an added utility body in the bed at all times. Before addinng the Enhancement System I did not feel that I had control of the truck. After adding the system the truck drives much easier and has a "safter" fee.
by:
2026 Ford F-550 Cab and Chassis
Quality product, I have owned Timbrens before. They work good. Installation is fairly easy depending on your skill level. Etrailer as always - great!
by:
2025 Ford F-450 Super Duty
The reality of how long it took to install was misrepresented. I am 74 years old and my wife and I installed these bump stops in about a 2 hour span including rest time. We actually expected that. The results were as promised and I truly appreciate that.
by:
Awesome. They work great. I’m glad I chose this path versus airbags.
Scott profile picture

Scott

5/9/2026

They work great and are holding up well after a year in service on my 2011 F350 SRW hauling my Lance 855 truck camper.

by:
Dodge Ram Pickup
Works very well on my Ram 3500 long box 4x4. Really helped with stability pulling a 2600# tongue weight, 16K Gvw 5th wheel. Super easy install!
Loren profile picture

Loren

3/6/2026

No changes, zero issues or regrets!

by:
Package arrived and pretty beat up from shipping, everything was there except the hardware. I sent etrailer an email and Joy T. replied back quickly, got hardware in the mail and I installed today. Great service and quick response!
by:
2006 Chevrolet Silverado
This review is on a timbren air spring ,I bought this on a Saturday night ,went out of town Monday morning and got in on Thursday afternoon ,wife said the box had arrived Tuesday and put them on this morning on our 2006 Chevy k-3500 ,my guy had the truck in our shop for an oil change and I asked him to put it on, came back 45 min later and he was done with the spring installation and the oil change ! I asked him how hard it was and he said it took him longer to figure out which parts in the kit he needed that the actual install ,said it was about as easy as it gets .Well ,now for the test drive we drove the truck empty ,pretty much as stock ,rode real well.Then we put a Gaylord box that weighed 4506# and drove the truck ,WoW ,What a difference ,truck rode great and handled well ,went over railroad tracks,really handled well and rode great ,I wish I'd have done this years ago ! I highly recommend this product and commend etrailer on their good service and what made me decide to purchase the timbren product was the you-tube video ,after I saw that ,I placed the order ,it looked so simple to install and it went on just like on you-tube
Bryan L. profile picture

Bryan L.

12/11/2017

The air springs have performed flawlessly ,very pleased with the product and performance ! As a matter fact I was recommending this product to a friend the other day.

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See what our Experts say about this Timbren Vehicle Suspension

  • Use of Timbren Rear Suspension Kit on Flatbed Truck Carrying Heavy Loads
    There are several Timbren rear-axle suspension helper spring kits for your 2006 F-150, shown on the linked page, that offer either 6000-lbs of combined load support or 7000-lbs of load support as with the kit # TFRTT1502D that you referenced. This specific kit is designed expressly for heavy-duty 2WD "severe service" vehicles like tow trucks and also vehicles that carry heavy loads. 4WD trucks use kit # TFRTT150D. I spoke to my technical contact at Timbren about your concern. He noted...
    view full answer...
  • Timbren Rear Suspension Enhancement Recommendation for a 2006 Ford F-150
    For a standard 2006 Ford F-150 you want the 6,000 lb Timbren Set # TFR150D. The 7,000 lb Set # TFRTT150D is a Severe Service kit and is designed for vehicles that will have a pretty constant heavy load like if you use a slide-in camper or salt spreader frequently - or even if you used your truck with a crane or aerial device like what you see with a tow truck. Attached is an installation video of the 6K Timbren kit being installed on a 2004 F-150 for you to check out.
    view full answer...
  • Spacer to Install Timbren Suspension Kit on 2006 Ford F-150 with 3 inch Lift
    Timbren offers lift spacers for applications like yours where a lift kit was installed on the vehicle. For that you'd need the 1 inch spacers part # A25723-90AH00 with the part # TFRTT150D. Since you have a 3 inch lift you'd need a total of 6 of these. This takes up the additional space created by the lift to allow the Timbren to engage like it needs to provide the needed support.
    view full answer...
  • Does Timbren Rear Suspension Enhancement TFRTT150D Fit on a 2007 Ford F-150 Harley Davidson Edition
    I spoke with my contact at Timbren and he stated that you can use the suspension enhancement, # TFRTT150D, if you wanted to on your 2007 Ford F-150 Harley Davidson model. This kit is designed more for vehicles that have been converted into dump trucks, tow trucks, or other similar models or that have a slide in bed camper. I have included a link to the installation details for you to view. I have also included a link to our FAQ article on Timbren systems for you.
    view full answer...

Do you have a question about this Vehicle Suspension?


Info for this part was:

Employee Tyler C
Written by:
Tyler C
Employee Michael H
Expert Research:
Michael H
Employee Jameson C
Expert Research:
Jameson C
Employee Jeff D
Installed by:
Jeff D
Employee Robert C
Installed by:
Robert C
Employee Dustin K
Video Edited:
Dustin K
Employee Chris R
Video Edited:
Chris R
Employee Mary K
Updated by:
Mary K
Employee Wilson B
Updated by:
Wilson B
Employee Michael B
Updated by:
Michael B
Employee Carrie F
Updated by:
Carrie F
Employee Lincoln B
Updated by:
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Employee Jonathan Y
Video by:
Jonathan Y

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