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  1. Vehicle Suspension
  2. Ford
  3. F-150, F-250, F-350
  4. 1989
  5. Timbren
FITS 1989 Ford F-150, F-250, F-350
Timbren Suspension Enhancement System - Severe Service - Rear Axle

Timbren Suspension Enhancement System - Severe Service - Rear Axle

Item # TFRTT350F
Retail:$468.32
Our Price: $398.07
You Save: $70.25
Vehicle Suspension
Confirmed to Fit
1989 Ford F-150, F-250, F-350

F-350 - Cab and Chassis

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Timbren vehicle suspension for your 1989 Ford F-150, F-250, F-350 are available from etrailer.com. Installation instructions and reviews for your Ford vehicle suspension. Expert service, and great vehicle suspension prices. etrailer.com carries a complete line of Timbren products. Order your Timbren Suspension Enhancement System - Severe Service - Rear Axle part number TFRTT350F online at etrailer.com or call 1-800-940-8924 for expert service.
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1989 Ford F-150, F-250, F-350 - Timbren Suspension Enhancement System - Severe Service - Rear Axle

  • Rear Axle Suspension Enhancement
  • Jounce-Style Springs
  • Extra Heavy Duty
  • Timbren

8,000-lb Capacity hollow rubber springs sit above the rear axle to help stabilize and level your Ford F-150, F-250, F-350. Provides a comfortable ride by absorbing road shock and improving stability. Ideal for trucks with slide-in campers or an in-bed salt spreader.


Features:

  • Improves suspension, handling, and safety
    • Ideal for trucks with slide-in campers or an in-bed salt spreader
  • Provides additional support as needed so you always have a smooth, comfortable ride
    • Allows the leaf spring ample movement while cushioning light loads
    • Becomes more rigid as more weight is added
      • Increases stability - providing great performance while hauling heavy loads
      • Reduces vehicle 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 vehicle's suspension


Specs:

  • Includes 2 Aeon hollow rubber springs, vehicle-specific brackets and hardware for simple installation
    • Replaces axle bump stops on frame
    • No drilling required
  • Capacity: 8,000 lbs
    • Do not exceed the vehicle's weight-carrying capacity
  • Height of bracket sides: 3"
  • Spacer height: 1"
  • Spring length: 3-3/4"
  • Designed to work with a suspension system that is in good working order
  • Limited lifetime warranty - satisfaction guarantee


An example of sag on a vehicle's rear axle under a heavy load

Whether you're hauling heavy loads in your bed or cargo area or you're towing a trailer, you will often see the rear of your vehicle sag while the front end rises. In these cases, the rear axle is handling not only the weight of the cargo, but also more of the vehicle's weight. Because less weight is on the front axle, the front tires are making less contact with the road. Overall handling - traction, steering, and braking - is negatively affected. But the resistance from Timbren's Suspension Enhancement System works with your factory suspension to keep your vehicle level and improve your driving experience.


Diagram of the Timbren spring installed

The Timbren system comes with custom-fit brackets that are bolted onto each frame rail above the rear axle. Hollow rubber springs are bolted to the bottom of the bracket and hang down to where the bottom of the spring sits, 1" above the axle. The inch of clearance allows the existing factory suspension to operate normally under light loads and standard terrain, ensuring the smooth, comfortable ride that you are used to.


Animation of a standard Timbren rubber spring

Timbren Suspension Enhancement Systems are designed to work progressively. When the hollow rubber springs are compressed, the convoluted design causes them to quickly collapse along the folds. Once the folds are compacted, the stacked barrel shape increases resistance, stiffening the suspension and keeping your vehicle level.


Timbren suspension system works to prevent body roll

Each hollow rubber spring works independently to support the driver's side or passenger's side of your vehicle. This is helpful when you swerve or make sharp turns. Each spring is activated when it is needed, so body roll is greatly reduced. The independent action also works well when you are hauling off-center loads.


An example of a trailers swaying

Because the vehicle handles better with the springs, less turbulence will be passed along to the trailer, and this helps to keep the trailer in line. Your driving comfort is further enhanced if the trailer does begin to sway (from a gust of wind or a passing semi), because the movement from the trailer is not transferred to your vehicle. This also works to make the sway subside more quickly.


An empty truck on a bumpy road without Timbren

Another great feature of the rubber construction is that the springs absorb most of the road shock, creating a smoother, more stable ride overall. Wear and tear on the factory suspension is also lessened because the rubber springs work to prevent bottoming out on rough roads.


Timbren Suspension Enhancement Compared to the Competition

Timbren's Suspension Enhancement Systems are much easier to install than air springs - there are no air hoses to run, no compressors or gauges to hook up, and no manual adjustments to make. The rubber construction makes Timbren's springs more elastic than similar products constructed of microcellular urethane. And more elasticity allows for a more comfortable ride because the rubber has more travel.



FRTT350F Timbren SES with Aeon Hollow Rubber Springs - Rear Axle - Severe Service

Installation Details TFRTT350F Installation instructions

Customer Satisfaction Score:


Customer Reviews

Timbren Suspension Enhancement System - Severe Service - Rear Axle - TFRTT350F

Average Customer Rating:  4.7 out of 5 stars   (6049 Customer Reviews)

8,000-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.
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See what our Experts say about this Timbren Vehicle Suspension

  • Recommended Timbren Suspension Kit for 2015 Ford E-350 Motorhome
    For your motorhome that is built around a Ford F-350 cab and extended chassis I suggest a kit designed for severe duty. For your front axle you can use Timbren kit # TFF550SDH which works on both 2WD and 4WD models. This kit installs without drilling and will help stiffen your front suspension through its progressive resistance. For a rear axle kit you can use # TFR350TTCC which also fits both 2WD and 4WD versions. Both install in place of the factory bump stops. The kit you referenced,...
    view full answer...
  • Timbren Suspension Enhancement Recommendation for 2016 Ford F-250 Towing Fifth Wheel
    I would recommend the Timbren part # TFR250SDG which has the 8,600 lb capacity over the part # TFRTT350F as this kit is designed for severe duty vehicles like tow trucks. The ride quality would be rather harsh. I attached an install video for the # TFR250SDG for you to check out as well. This kit will provide you the support you need without being overly harsh.
    view full answer...
  • Timbren Rear Suspension Enhancement System Spring Fell Off 2008 Ford F-250
    This is extremely rare and I can only imagine this happening if the springs were incorrectly installed, or were in the wrong location, under an extremely heavy load, or possibly having the wrong system installed. Per the instructions, there should only be a gap between 1/2 to 1-1/2 inches when the vehicle is empty. That gap is eliminated when the vehicle has a load added. The Timbren system is designed to work with a suspension system that is in good working order.
    view full answer...
  • How to Use Timbren Rear Suspension Kit # TFRTT350F in 2006 Ford F-250 with 2-Inch Suspension Lift
    Timbren offers 1-inch spacers # A25723-90AH00 that can be used when their rear axle suspension kits are to be installed in a lifted truck. You'll need 2 spacers per side in your application and to locally source 2-inch longer bolts. Please refer to the linked video that shows a suspension kit being installed in a lifted truck.
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  • Recommended fifth Wheel Hitch And Under Bed Rails For 2013 Ford Truck With Ride-Rite Air Suspension
    There are a couple solutions to install a fifth wheel hitch on your truck. An option would be to remove the Ride-Rite system and install Timbrens like part # TFRTT350F. The installation of these will not require a bracket with a bolt that runs through the frame rail and interfere with the installation of the # RP30126. Another option, and the one I recommend is to install a B & W Fifth Wheel Hitch like part # BWRVK3500-5W, and the Custom Installation Kit, part # BWGNRK1111-5W. This system...
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  • Which Timbren Springs Are Recommended for a 2008 Ford F-250 with In-Bed Camper
    For your 2008 Ford F-250, I recommend using the Timbren Rear Suspension Enhancement System part # TFRTT350F as this kit has a 8,000 lb weight capacity and is specifically designed for trucks with an in-bed camper. These springs will provide the most amount of support for your situation. In addition to added support, the springs will also work to reduce body roll and increase stability. I have attached a review video of the above system for you as well.
    view full answer...
  • Recommended Suspension Enhancement for 2013 Ford F250 with Service Body
    We have a Timbren Aeon Spring system that is specifically designed for service-body truck and has the high capacity necessary for such a vehicle, part # TFRTT350F. The springs will add extra support to your rear suspension, and will become progressively stiffer as more weight is added. A weight distribution system would work best for combating the squat you experience when towing, but the Timbren system will help somewhat. Since you tow infrequently and for short distances, you can probably...
    view full answer...
  • Which Timbren Kit HD or Lighter Duty for 2016 Ford F-350 That Hauls Campers Frequently
    The difference in harshness between the Timbren kits part # TFR350SDF and # TFRTT350F would be very noticeable. Especially when unloaded. Your truck is already going to have a rough ride as that is the nature of 1 ton trucks but the 12k Timbren kit will make for a very harsh ride when unloaded. I really wouldn't recommend that unless the truck is going to be loaded to near it's max capacity most of the time it will be on the road. For what you are looking to do I would go with the lower...
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  • Best Rear Suspension Upgrade for 2015 Ford F-250 4x4 With In-Bed Camper Besides Air Bags.
    I recommend using the SumoSprings Rebel Custom Helper Springs # SS96MR hands down! These are my favorite suspension upgrade that have zero maintenance involved like the air bags require. These are designed to increase in stiffness as they are compressed so as far as the unloaded ride quality you will only see an improvement there along with a slight decrease in body roll when cornering. The Timbren's like Rear Suspension Enhancement System part # TFRTT350F are also hassle free but when...
    view full answer...
  • Timbren Suspension Enhancement Recommendation for a 2015 Ford F-250 Towing Fifth Wheel
    Timbrens would be a great option for you. These will provide you with suspension support when you need it and won't affect ride quality when you aren't towing. The kit you will want is the part # TFR250SDG which is the lighter duty of the two sets available for your truck. The higher rated part # TFRTT350F has a much stiffer rubber spring as it is designed for severe service vehicles only. I attached an install video for you to check out as well.
    view full answer...
  • Which Weight Rating Timbren Rear Suspension Enhancement Should I use on my 2009 Ford F-250
    It depends on the loads you are putting in your 2009 Ford F-250. The Timbren Suspension Enhancement Systems for F-250 rear axle have the following capacities: 6,000 pounds for part # TFR250SDF and 12,000 pounds for part # TFRTT350F. If the total weight of what is in the bed of the truck and the tongue weight of any trailer used is less than 6,000 pounds, use part # TFR250SDF. If the combined weight of what is in the bed an any trailer tongue weight is more than 6,000 pounds, use part #...
    view full answer...
  • Solution for Reducing Harshness In Ride Quality of Timbren Kit TFTTT350F
    Remove the spacer between the jounce spring and the mounting bracket. That will give you more clearance so that the suspension can move a few inches before activating the Timbren.
    view full answer...
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  • Timbren Rear Suspension Enhancement Recommendation for a 2012 Ford F-250 Super Duty 4x4 Long Bed
    Adding the Timbren suspension enhancement springs to your 2012 Ford F-250 Super Duty 4x4 is a great way to help support your camper and other loads that you may carry throughout the year. The peg style casting on your rear axle that you are referring to will withstand the contact of the Timbren suspension systems. Timbren designed their rubber springs to contact that peg and in the instruction manual that I have attached, they state not to remove the peg. The Timbren rear suspension enhancement...
    view full answer...
  • Differences Between Timbren Helper Springs TFR350SDF and TFRTT350F for a 2016 Ford F-350
    Timbren helper springs # TFR350SDF and # TFRTT350F both fit the 2016 Ford F-350. Kit # TFRTT350F is rated for 8,000 pounds but was designed for sever service vehicles such as tow trucks. Kit # TFR350SDF is rated higher at 8,600 pounds and fits regular consumer pickup models. The kits use different rubber springs and different upper brackets as well. I have linked the instructions for both for you to compare.
    view full answer...
  • Recommended Suspension Enhancement for 2014 Ford F-350 Super Duty Hauling 16 ft Trailer
    There is a suspension enhancement solution that will work for your 2014 Ford F-350 but the Timbren # TFRTT350F is designed for use with service vehicles such as tow trucks and would not be the best option for you. Instead I highly recommend the Timbren Rear Suspension Enhancement System # TFR350SDF which have an 8,600 lb capacity and will give your truck the support it needs when hauling your water tank and pressure washer skid. This system will not require any drilling and works by becoming...
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  • Solution To Fix A Truck With A CM Flatbed That Keeps Bottoming Out When Hitting Bumps
    To correct your Ford e350 with a CM flatbed, it is recommended to use the: -Timbren Suspension Enhancement System # TFRTT350F. This suspension enhancement is designed to reduce vehicle sag, help compensate for off-center loads, and absorbs road shock which should resolve your bottoming out problem. If you can provide some more information about your truck, I'd be happy to help. Additionally, you can absolutely haul a car hauler trailer as well, you'd just need a hitch like # C13014,...
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  • Best Timbren Suspension System For 2008 Ford F-350 For 5th Wheel & Truck Bed Camper
    That's a good question, and between the two systems, the best one for your 2008 Ford F-350 for support while you are towing your 5th wheel as well as when you using a truck camper is the 8,600 lb option: - Timbren Rear Suspension Enhancement System # TFR350SDF The 8,6000 lb capacity of the # TFR350SDF is more than enough for both the pin weight of your 5th wheel as well as your truck camper. More than that though, the reason they are the best is because they are double-convoluted, while...
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  • Which Timbren Helper Spring Set Should I Get For My 2012 Ford F-350 4X4
    I recommend # TFRTT350F for your 2012 Ford F-350 4X4. It has an 8,000 pound weight capacity, which will support the load you have and help with the stability of the ride.
    view full answer...
  • Correct Timbrens for a 2001 Ford F-350 Cab and Chassis
    There are two Timbren Rear Suspension Enhancement Systems for a 2001 Ford F-350, part # TFR350SDF for standard models or part # TFRTT350F for service models. If you have a cab and chassis I recommend the latter as they will be better suited for this application.
    view full answer...
  • Which Timbren Springs Should I Use For A 2016 Ford F-250 Super Cab With 8,000 lb Jayco 5th Wheel
    For your 2016 Ford F-250 Super Duty, the Timbren Rear Suspension Enhancement System that is the best fit for your application is the # TFR250SDG. It has a 8,600 lb capacity that will suit your needs well. The Timbren springs compress as needed for support, and the heavier weight capacity the stiffer the spring. With these style of springs you don't want to over-do the capacity because it will give you a more rigid ride for your truck. When they aren't engaged with a loaded weight, you...
    view full answer...
  • Selection of Timbren Rear Axle Suspension Kit for 2006 Ford F250 Crew Cab Short Bed 4WD
    The Timbren Rear Suspension Enhancement System # TFRTT350F is intended primarily for heavy-duty service vehicles but would work fine for your application. Both this kit and the lower-rated # TFR250SDF are confirmed fits for your 2006 Ford F-250 Crew Cab Short Bed 4WD. For your reference I have linked the instructions for both kits along with a video on the TFR250SDF. Please note that all suspension kits, including these Timbrens, are designed for use with vehicles whose suspension systems...
    view full answer...
  • Recommendation for Timbren Springs for 2011 Ford F250 Super Duty Towing a Pop-Up Camper
    If it were my truck, I would go with the # TFR250SDG. Timbren probably recommended the # TFRTT350F to just be extra cautious about the weight of the camper. The # TFR250SDG system will have no problem carrying the stated camper load weight rating. I've attached a video of it being installed on your vehicle for your convenience.
    view full answer...
  • How Much Torque to Install Timbren SES Kit TFRTT350F
    Hey Jim, when installing the Timbren SES kit part # TFRTT350F 33 ft lbs of torque would be the correct amount.
    view full answer...
  • Will Air Bags Work On a 2013 Ford F-350 with Flat Bed
    I do have an option for you but for a constant load like the service body/flat bed has, we recommend the Timbren Rear Suspension Enhancement System part # TFRTT350F which is designed for this exact purpose. It's not adjustable like air bags but the adjustability really doesn't matter for constant loads and these are maintenance free so you don't ever have to worry about them. They will not only support the weight of the bed but also additional gear and trailers.
    view full answer...


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