1. Vehicle Suspension
  2. Timbren
  3. Jounce-Style Springs
  4. Rear Axle Suspension Enhancement
  5. Extra Heavy Duty
Timbren Rear Suspension Enhancement System

Timbren Rear Suspension Enhancement System

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Vehicle Suspension TFR350SDF - Extra Heavy Duty - Timbren
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8,600-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. Lowest Prices for the best vehicle suspension from Timbren. Timbren Rear Suspension Enhancement System part number TFR350SDF can be ordered online at etrailer.com or call 800-298-8924 for expert service.
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  • Reviews (2243)
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Timbren Vehicle Suspension

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

8,600-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.


Features:

  • 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 vehicle
    • 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: 8,600 lbs
    • Do not exceed the vehicle's weight-carrying capacity
  • Designed to work with a suspension system that is in good working order
  • Limited lifetime warranty - satisfaction guarantee


An example of sag on a truck's rear axle under a heavy load. The Timbren Suspension Enhancement System levels the vehicle.

Whether you're hauling heavy loads in the cargo area or by pulling a trailer, you will often see the rear sag while the front end rises. In these cases, the rear axle is handling not only the weight of the cargo, but more of the truck's weight, as well. 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 has a custom-fit bracket that will be 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, one inch 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 the truck level.


Timbren suspension system works to prevent body roll

Each hollow rubber spring works independently to support the driver's 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 the truck. 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.


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.



FR350SDF - Rear Suspension Enhancement System with Aeon Hollow Rubber Springs by Timbren

Item # TFR350SDF

Installation Details TFR350SDF Installation instructions

This Product Fits The Following Vehicles





Customer Reviews

Timbren Rear Suspension Enhancement System - TFR350SDF

Average Customer Rating:  4.7 out of 5 stars   (2239 Customer Reviews)

8,600-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.

- TFR350SDF
by:
2012 Ford F-350 Super Duty

I placed these on my 2012 F-350 SRW as an alternative to putting air bags on due to the price difference. The timbrens have worked well when pulling but has taken the rough ride of a one ton truck and made it worse under normal driving conditions. These don't allow for much travel of the suspension when going down the road and hitting normal bumps. If you're considering these or airbags spend the extra money on airbags and be done once and for all. 401122



- TFR350SDF
by:

Great product and installs easily. I did not use the spacer, so this allows the stock suspension about 1-1/2" of travel before contacting the Timbren units. I tow a 16K fifth wheel and the Timbren's handle this load very well. You can see the compression marking on the lower side of the Timbren when the trailer is hooked up to the truck. Just enough contact to keep the truck at a level stance. My stock "bump stops" were starting to fall apart from age and wear/tear. These Timbrens now add an extra level of suspension that makes the truck feel much more in control when pulling the fifth wheel. 574936



- TFR350SDF
by:
2016 Ford F-350 Super Duty

I drive a F350 Super Duty, 2016, Crew cab, short bed. I pull a 38 FT, 16,500 GVWR goose neck 3 horse with living quarters. I was going to put in air bags as I was sick of slamming into my bump stops and my headlights aiming to the sky; oddly the trailer towed great except for those two items. I had thought about the Timbren's but was hesitant. After my trailer guys at Triple C in Watervliet, MI; great guys, told me they had stopped putting in air bags, but now suggested the Timbren enhancement system, I thought I would try it. GREAT PRODUCT; cheaper than airbags, easier to install, no maintenance and works great. I put them and immediately drove the horses from Chicago to West Palm with no problems. Truck is almost perfectly level now. I did not have one of the shuddering slamming events I typically get 3 of in Indiana alone. I would strongly recommend. Also; he service was great. The online ordering would have gotten it to me late, but I called and LaceyG was a huge help in getting it with that days shipments. She was also a big help on finalizing my decision. 591937



- TFR350SDF
by:
2015 Ford F-350 Super Duty

Towing our 15 thousand pound fifth wheel is way better since i installed these. Highly recommend over the the ride. Easy install. Fuctional affordable. Great product 500554



- TFR350SDF
by:

Good product and XLNT shipping..Good all around.... 319975



- TFR350SDF
by:
2013 Ford F-350 Super Duty

No complaints with Etrailer customer service and delivery time. I thought I would need the spacer, and while putting everything together to check the fit, the bolts were not long enough. I drove to hardware stores for longer bolts. Well I did not need the spacer, and wasted some time. The stock stops were a bitch to take off. The only method that worked was tie wrapping pliers to the stops to grip in order to turn the bolts. The Timbren stops went on very easy. I hooked up my trailer for a drive. The truck does not sag and does not bump up and down as before. I drive a 2013 Ford F-350 single axle. I took my wife for a ride with out the trailer and she feel the stiffness of the Timbren, but nothing uncomfortable. 528768



- TFR350SDF
by:

Very easy install, the video on here was very helpful. No difference in ride quality when truck is empty. Haven't towed yet since the install, but so far am very happy with them. 271442



- TFR350SDF
by:
2015 Ford F-350 Super Duty

My 2015 F-350 dually would always squat when I’d hook up my fifth wheel. Towed it for the first time since purchase and install and the truck is nice and level. The ride is better also and after driving a bit without the camper I don’t really notice them. I love the simplicity of these over airbags and imagine they won’t be needing any maintenance or replacement anytime soon. Great simple solution. Not so easy for an old fat guy to install laying under the truck in the driveway but I managed! 442491


Comments
They work. It is nice towing nice and level now. The ride with the load on is good and smooth and very stable. I am still very happy I went them. Put them on and forget about them, no maintenance and no worries.
John R - 10/13/2018

44594

- TFR350SDF
by:
2016 Ford F-350 Super Duty

Product works as designed and solved the sag I was getting when towing my fifth wheel. 279012



- TFR350SDF
by:

Have not towed our fifth wheel with these installed yet which was the main reason for the purchase. Towed a dump trailer and the added stability was definitely noted. With my truck loaded as usual with several hundreds of pounds of gear (two tool boxes, wood dunnage for leveling camper, ladder, B&W Companion fifth wheel hitch/Turnover ball, floor jack, tire inflator, jumper cables, screw gun kit, two traffic cones, brooms, squeegee - you get the idea!) the Timbrens are in contact with the bumper bars on the axle setup. Was hoping that the springs would not be in contact during normal daily driving but the stiffening of the ride is more than tolerable. I did not install the additional spacers as I could tell it would just add more weight to the Timbrens when loaded for daily driving. I'm sure if my truck bed was truly empty I would be off of the Timbrens. As for the five star rating without using these for the primary purpose I must say that is all on etrailer. They were great to deal with, answered a question I had very well and the shipping was extremely fast. 421213



- TFR350SDF
by:
2015 Ford Fusion

I have installed and used the Timbrens on my 2015 F350 dually with my 5th wheel Keystone Fusion RV for a year now. i have to say that the Timrens are not only easy to install but make the ride of my truck excellent not only on the highway but back roads as well that includes very twisty turns. Timbrens keep my truck level and i don't have to ever worry about airbag air pressure. i have owned airbags before and never again will i ever buy or use them. When you don't have a load in the bed or your RV hooked up the Timbrens ride above then axles.. Best investment for towing period! 264475



- TFR350SDF
by:
Ford F-350 Super Duty

This is my second set of Timbren SES, I had purchased this product previously ,for a F350 pulling a Sundowner Gooseneck Trailer. Updated truck, had to have another set.....NO trailer sway-sagging, excellent product, easy installation too. I would recommend this! 242850



- TFR350SDF
by:
2016 Ford F-350 Super Duty

The Timbrens are great. I have not had the truck with a full load yet but I anticipate they will help bring the truck back to level. The install went well but we were not able to use the additional spacer even with the longer bolts. We were not able to put enough pressure on the bolt to get the nut started. I don’t believe I will need the spacers so it should be ok. The directions didn’t include the amount of torque that was needed so I sent e-trailer an email. They checked with Timbren and the torque is 1/4 turn after they are tight. Ive attached some pictures of the completed install. 566262



- TFR350SDF
by:
Ford F-350 Super Duty

I've had the Timbrens installed for about a year now and can report that they have done exactly what I wanted from them. The install was pretty easy (did it in the driveway using my creeper). My F350 was squatting a bit from the 3000# pin weight and I wanted to reduce that. Unloaded I can't tell they are there unless I hit a pretty big bump and when we're hitched they eliminate most of the squat and the truck is now pretty level when towing. I was thinking about installing air bags but went this route since it was simple and cost less. It's a great product! I've read some complaints about a rough ride when unloaded and I think that's due to not getting the unloaded gap right during installation. Submitting an "Installed" pic. 639141



- TFR350SDF
by:

Works perfectly, With trailer it maintains a level ride. When not towing ride is the same as before install. Would highly recommend. 826091



- TFR350SDF
by:
1988 Ford F-350 Super Duty

I easily installed these on my 1988 F-350. About a year ago I put a 960# slide in unit for cleaning Porta Potties on the flatbed of my F-350. The springs are 32 years old and sagged under the weight. With the sag and sway I couldn’t even fill the 400 gallon tank. After installing the Timbren the truck sets the way it is supposed to and no more sway while going around curves and corners. 820886



- TFR350SDF
by:
2006 Ford F-350 Super Duty

Product works as advertised. My order arrived on time and I installed on the same day. Easy installation. The hardest part was removing the original bump stop, which had completely deteriorated on my 2006 F350. 820333



- TFR350SDF
by:

I was impressed with the ease that they went on, I wish that other companies would follow their lead. 771632



- TFR350SDF
by:
2016 Ford F-350 Super Duty

Installation was a breeze on my 2016 F-350 sbcc 4x4 thanks to the provided videos (didn't even need to jack up the truck). It has performed as advertised towing a 16,000 lb 5th wheel, no squat, rides great on most surfaces and handles curves with little effort. The frosting on the cake is the fact that they require no maintenance! I will never buy another set of air bags again! 516664


Comments
Just came back from a 5,000 mile trip through 6 states towing a 16,000 5th wheel. We encountered everything from dirt roads to major city interstates. The Timbrens performed flawlessly as advertised.
Scott S - 06/13/2019

56537

- TFR350SDF
by:
2016 Ford F-350 Super Duty

Awesome fantastic service 501012



- TFR350SDF
by:

Great website with great product. The installation instructions were amazing. Installed in less then hour. No better place to purchase. 453927



- TFR350SDF
by:

Performs as advertised. Don't have to worry about air pressure, air line etc. They will take a set after sitting with a load so actual ride hight will be slightly lower. 432884



- TFR350SDF
by:
2013 Ford F-250 and F-350 Super Duty

Easy to install. Keeps the rear end level now. 350693



- TFR350SDF
by:
2005 Ford F-250-and-F-350-Super-Duty

great delivery time. I received them this afternoon and installed them in about an hour. thanks to the video that showed everything step by step. thanks for a great product. I think this is just what we needed to help haul our camper and pull our car hauler at the same time. thanks again 241212



- TFR350SDF
by:
2016 Ford F-250 Super Duty

Bought the Timbren Susp. System for a 2015 Ford F-350 Super Duty used to pull a 16,000# fifth wheel trailer. Had this on my former 2012 Ford F-250 Super Duty used to pull a 12,000# fifth wheel and the Timbren Susp. System kept the rear from sagging when the trailer was loaded. Keeping the truck level really made the truck more stable and enjoyable to drive when pulling the fifth wheel. 212589


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Ask the Experts about this Timbren Vehicle Suspension

  • 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...
  • How Tight Should Mounting Bolt Be with Timbren Jounce Spring Kit TFR350SDF for 2016 Ford F-350
    The Timbren rear axle jounce spring kit # TFR350SDF which fits your 2016 Ford F-350 Super Duty does not include specific torque specs so when you install these you'll simply want to snug down the bolts. I suggest 1/4 turn after the bolts stop rotating. I did check with Timbren and they confirmed the 1/4 turn should be just fine.
    view full answer...
  • Comparison of Jounce-Style or Air Bag Suspension Enhancement
    Jounce-style helper springs are easier to install than air bags since they're less parts involved. Also, once they are installed you basically leave them alone. Air bags need to have the air pressure monitored and changed according to the load that's being carrier. The jounce-style will not impact the ride quality unless there is load present. The benefit of the air bags is that you can adjust them to your liking when you need to. If the weight in your truck varies on a regular basis...
    view full answer...
  • Is the Timbren Suspension System or TorkLift the Better Option for a 2015 Ford F-350
    I recommend going with the Timbren Rear Suspension Enhancement System # TFR350SDF. Even though the TorkLift StableLoad Suspension Upgrade for Upper Overload Springs # TLA7200 that you referenced are a good option, the Timbren system does a better job at stabilizing the weight. The TorkLift option will activate your leaf springs much sooner when they are under a heavy load, but the Timbren option provides additional support for your lift springs and takes on the brunt of bumps and rough...
    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...
    view full answer...
  • Best Suspension Enhancement for a 2016 Ford F-350 with Truck Bed Camper
    For your 2016 Ford F-350, I recommend using the Timbren Rear Suspension Enhancement System part # TFR350SDF which are going to do an excellent job of providing more support while hauling around your truck bed camper and are a very popular option for just this purpose. There shouldn't be any issues with the upgraded rear sway bar you have now. This kit is going to both increase the side to side stability but also more so help to reduce rear end sag. It comes with a spacer that can be added...
    view full answer...
  • Compatibility of Timbren Jounce Spring Kit # TFR350SDF with 2008 F350 with B&W Turnover Hitch
    I contacted the technical staff at B and W to confirm compatibility of their Companion 5th wheel hitch with aftermarket rear suspension kits such as the Timbren Jounce Spring Kit # TFR350SDF in your 2008 F350. My contact there advised that a jounce spring like this kit will not interfere with the hitch installation. This kit installs in place of the factory jounce bumper. Please refer to the attached photo which shows the mounting location. Hardware is included. Advantages of this type...
    view full answer...
  • How to Determine Fitment of Timbren Rear SES on a 2011 Ford F-350 with 2-1/2 Lift
    To ensure proper fitment of the Timbren Rear Suspension Enhancement System # TFR350SDF on your 2011 Ford F-350 with the 2-1/2" lift you just need to measure from the frame surface where your OEM bump stop sits to your axle. This Timbren kit is 7-1/2" tall (including the 1/2" spacer) so if that distance measures between 7-1/2" to 9" this will fit your application, plus it is rated for up to 8,600 lbs. I have attached an installation video of this Timbren system on a 2013 F-350 that you...
    view full answer...
  • Compatibility of B&W Gooseneck Hitch and Timbren Springs for 2008 Ford F-250
    The correct rear axle Timbren Jounce Spring kit for your 2008 Ford F-250 4X4 is part # TFR250SDF. The kit # TFR350SDF you referenced fits the F-350. Any suspension kit can potentially have interference with either a 5th wheel or goose neck hitch if the two items require the same mounting points on the truck's frame. You can use the Timbren installation instructions I have linked to see where these jounce springs attach (in place of the factory bump stops) and compare that to your hitch...
    view full answer...
  • Suspension Enhancement to Reduce Squat Experienced When Trailer is Hitched to 2006 F350 Dually
    Adding an additional leaf spring would somewhat increase the height of the rear of your truck, as you suspected. A suspension enhancement product like the Timbren part # TFR350SDF you mentioned is primarily designed for loads placed in the truck bed. In most cases, using this product will somewhat decrease the squat you are experiencing, but the weight being applied to the rear of the vehicle will lighten the front end, resulting is decreased front braking performance and steering response. A...
    view full answer...
  • Where on Vehicle Suspension Does Timbren Suspension Enhancement System # TFR350SDF Attach
    The Timbren Suspension Enhancement System # TFR350SDF bolts on to your 2006 F-250/F-350 in place of the factory bump stops. It works on trucks either with or without factory top overload springs. The installation instructions are included along with a video. Timbren springs offer the advantage of not affecting your ride quality unless they are under load. I have provided a link to our main page for rear suspension products for your Ford truck. You can use the drop-down menu at the...
    view full answer...
  • Installation Clearance of Timbren Vehicle Suspension Kit # TFR350SDF on 2006 Ford F-350
    The Timbren Vehicle Suspension Kit # TFR350SDF for your 2006 Ford F-350when installed correctly will have a gap between the bottom of the springs and the vehicle suspension. This gap is typically 1-inch or less according to my technical contact at Timbren. (Please note that this clearance gap is not unique to this product; similar products from other brands also can have a gap when installed correctly. Please refer to the included article if you wish.) This small gap is intentional and...
    view full answer...
  • Recommended Timbren Rear Suspension Enhancement System for a 2016 Ford F-350
    The correct set of Timbren Rear Suspension Enhancements for your 2016 Ford F-350 is part # TFR350SDF. The Timbren springs will do an excellent job of helping support the added weight of your 5th wheel trailer while towing. In addition to support capacity, the springs will also do a good job of reducing body roll, improving handling, and extending the life of your existing suspension components. You can see a set of these springs installed on a similar 2013 Ford F-350 which I have attached...
    view full answer...
  • Recommended Suspension Enhancement System for a 2012 Ford F-350 4x4 with Max Tow Weight of 15,500 LB
    I recommend going with the Timbren rear suspension system # TFR350SDF because it will keep your 2012 Ford F-350 4x4 more level and improve driving performance. The Timbren springs won't compress as much and have a higher weight rating. I think you will be very pleased with the Timbren system because they are designed to work with heavy loads. The weight capacity is 8,600 pounds and will be more than enough for your setup. The reason I wouldn't choose the SumoSprings is because they...
    view full answer...
  • What is Needed to Install the Timbren Rear Suspension Enhancement System on a 2015 Ford F-350
    The Timbren Rear Suspension Enhancement System part # TFR350SDF comes with everything you will need parts wise to install on your 2015 Ford F-350. The only thing that you will need that does not come with the kit is common tools such as a ratchet, socket set, and ratchet extension. As you can see in the attached install video, the process is very simple even for the most novice of installers.
    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...
    view full answer...
  • Timbrens or Air Bags for 2005 F350 Superduty With Slide-In Truck Bed Camper
    The best solution for you will largely depend on how you use your truck. The primary difference for your application between the Timbren # TFR350SDF jounce springs and an air bag system like the # AL57397 from Air lift is the resistance provided by the air bags can be adjusted to suit varying loads. If the only time the rear of your truck experiences sag is when the camper is installed, a Timbren system would be extremely effective, and would have no effect on your ride quality unless...
    view full answer...
  • How to Install the Offset Timbren Rear Suspension Enhancement on a 2011 Ford F-350 Super Duty
    The Timbren Rear Suspension Enhancement System, # TFR350SDF, is confirmed to fit for a 2011 Ford F-350 Super Duty truck. The offset design Aeon spring will replace the OEM stop and will align with the rear axle. I have attached an installation video of the Timbren being installed on a 2013 Ford F-350 and a picture of the unit installed in the offset position on the Ford truck.
    view full answer...
  • Recommended Timbren Suspension Enhancement for Ford F-350
    Timbren Suspension Enhancement will definitely help with the rear end sag and help you to have a more stable ride. To get the correct fit for your truck, I need to know the model year. For instance if your Ford F-350 is between 2005 and 2016 then I recommend the Timbren Rear Suspension Enhancement System # TFR350SDF. However, if your truck is a 2017 or 2018, then I recommend # TFR350SDJ. These products work on single rear wheel trucks as well as dually models.
    view full answer...
  • Weight Distribution System Recommendation for a 2005 Toyota Highlander to Help with Squat
    Actually what you would want is a weight distribution system. Using a weight-distribution system helps to ensure a smooth, level ride while also allowing you to tow the maximum capacity allowed by your hitch. Weight-distribution systems use spring bars to help combat the problems that often occur with standard hitch systems. Adding spring bars to your towing setup applies leverage to either side of your system, which transfers the load that is pushing down on the rear of your vehicle...
    view full answer...

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Info for this part was:

Expert Research:
Mike L
Expert Research:
Michael H
Expert Research:
Jameson C
Expert Research:
John H
Expert Research:
Adam R
Installed by:
Jeff D
Installed by:
Robert C
Video Edited:
Jacob T
Video by:
Andrew L
Video by:
Jonathan Y
Test Fit:
Randy B
Updated by:
Mary E

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