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Timbren Suspension Enhancement System - Rear Axle

Timbren Suspension Enhancement System - Rear Axle

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Retail:$391.88
Our Price: $333.10
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8,000-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 Suspension Enhancement System - Rear Axle part number TFRTT350J can be ordered online at etrailer.com or call 800-298-1624 for expert service.
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Timbren Vehicle Suspension

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

8,000-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
      • Rides just as smoothly when you're not hauling a load
    • Becomes more rigid as more weight is added for a great performance when you're hauling a heavy load
      • Increases stability
      • Reduces vehicle sag
  • Works independently - side-to-side adjustment
    • Helps compensate for off-center loads
    • Reduces body roll when swerving and turning corners
  • Acts as a shock absorber, taking the brunt of bumps and rough roads
    • Extends the life of your vehicle's suspension
  • Includes 2 Aeon hollow rubber springs, custom-fit brackets, and hardware for simple installation
    • Installs directly onto frame
    • No drilling required


Specs:

  • Load-leveling capacity: 8,000 lbs
    • Timbren springs will not increase your vehicle's weight-carrying capacity. Do not exceed the manufacturer's recommended weight limit.
  • 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.



FRTT350J Timbren SES with Aeon Hollow Rubber Springs - Rear Axle

Item # TFRTT350J

Installation Details TFRTT350J Installation instructions

This Product Fits The Following Vehicles





Customer Reviews

Timbren Suspension Enhancement System - Rear Axle - TFRTT350J

Average Customer Rating:  4.7 out of 5 stars   (3488 Customer Reviews)

8,000-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.

- TFRTT350J
by:

Never mess with airbags again on your truck. These Timbren bump stops are the only way to go. Installation took a total of 10 minutes and they work amazing. No messing with airlines, filling or deflating air bags with complicated installation. I’m towing a 44ft trailer and these Timbren bumps stops are a must. Great product but a little pricey for what they are.


Comments
After a year of towing some kind of trailer every week, the bump stops are showing some wear from riding on the bump stop pad on the axle. That being said, they are still working as intended and as good as the day I installed them. After a lot of miles, the only draw back is driving around with no trailer. Normal driving the ride isn’t effected but when you hit a bump in the road you really feel it hit the bump stop. You loose a fair amount of rear suspension travel with these but I’m used to it now.
Brandon - 05/11/2021


- TFRTT350J
by:

I have had the Timbren jounce bumpers on my truck for a year and have a truck camper on for most of that time and these things are great. I was worried about sway while also towing a boat and the bumpers exceeded my expectations by a bunch. So easy to install and what a stable ride! My fellow truck campers spent $100’s on air suspension and are blown away when I take them for a ride in my rig. They all feel they over spent! Great products from e trailer every time. I also have the frame mounted tie downs and together my rig feels safe and stable even in tight mountain roads. You can’t go wrong with these products!!!


Comments
No sag, no sway, and try these first if you tow or haul.
Ken C - 02/03/2021


- TFRTT350J
by:
2017 Ford F-350 Super Duty

I wanted to stabilize the minor sway on my 2017 F350 SRW/LB with a 2800 lb camper. I am so glad someone recommended these to me. I was about to spend several hundred dollars on some air-rides (not including installation). These were cheaper in price, require no maintenance or air, and are simple to install yourself. Only took me about 20 minutes per side. They definitely make a difference! I hardly notice the camper is on the truck. And when I'm not hauling my camper, there is no difference in the ride.


Comments
Yep. No question. I wish I knew about these before I put air-rides on my last two trucks. These have worked out very well.
Mike S - 01/21/2021


- TFRTT350J
by:
2017 Toyota Camry

Got to my house when I was told they would. Put these on a 2017 F350 Dually that I turned into a tow truck. Took about 5 minutes to put them on and the truck is completely different when towing. I towed my 2012 F350 before and after and it’s literally a night and day difference. Before, I felt like I was going to skate across the road and now it’s like there’s a little Toyota Camry on the back. I didn’t put the extra inch spacer because I was worried about ride quality, however I think I will in the future just so I feel better. My truck does still squat, however my application is completely different than pulling a normal trailer being that I do have an entire vehicle added directly to my truck’s suspension.Didn’t get any befores of me lifting the exact same vehicles, but it’s definitely different. I probably will add small helper springs later just being that I do constantly have a load as my lift on my truck weighs 1800lbs. alone.



- TFRTT350J
by:
2017 Ford F-250 Super Duty

Both sides in 20 min with air tools. Have 5th wheel (2500 hitch weight) and made the 17 F250 sag a little. This will help. Now my sticking point is price. Feel like I got ripped off seeing these rubber Kong dog toys that I paid Guess no different than paying $50 for under armor $20 sweat pants. OK, complaining over and would I buy them again? Yes with a coupon.



- TFRTT350J
by:

Truck did not squat under heavy gooseneck or fifth wheel. Ride was excellent. I just sold my truck and am ordering a set for my new truck.



- TFRTT350J
by:

Let me explain why I gave 4 stars and not 5. They are easy to install, and are tough enough to do the job, no doubt. My only complaint, and I'm in the process of remedying that, is that when these babies engage, they are there in full force. Let me explain. My upper overloads were a couple of inches from engaging, and these are about the same distance from the axle contact pad. The ride was great, but when I hit a bump like a pothole or RR tracks, the load would engage the overload and these springs at the same time and it made an abrupt jolt in the suspension. So much so that I was alarmed and have concern about long term affects to the framework. So, I have a set of Stableload uppers to install, will trim them a bit so that they progressively engage the upper overload earlier, so that bumps will be softened a bit against these springs. The only other option would be to install the spacers supplied with these springs such that these engaged full time while under load. I just don't know how much "give" these have and how they would ride.



- TFRTT350J
by:
2017 Ford F-250 Super Duty

This product was incredibly easy to install on my 2017 Ford F-250 Super Duty. About 10 minutes per side. Far simpler than air bags, which were my original target. Just towed my 35' fifth wheel on some twisty, hilly coastal highway and couldn't be happier. The suspension squat I had before is gone, the trailer felt much more stable and secure and getting my fifth wheel hitch to fully latch was far less of a problem (first time each time). These were a huge upgrade and are worth every penny. Installation is extremely simple. If you're thinking about it, do it! You won't regret it.



- TFRTT350J
by:
2020 Ford F-350 Super Duty

This is my 3rd set on 3rd different truck. These help keep truck level under load and help prevent trailer sway. Next truck, another set.



- TFRTT350J
by:

I haven't had a chance to pull a load yet. But it was super easy to install. took me longer to get the tools ready than the work.



- TFRTT350J
by:
2017 Ford F-350 Super Duty

Extremely fast shipping and always great customer service.



- TFRTT350J
by:

worked perfect. Very easy install. Made the vehicle nice and stable when loaded.



- TFRTT350J
by:
2021 Ford F-350 Super Duty

Second vehicle I have ordered the Timbren Suspension System for, great product, smooths out the ride under heavy loads.



- TFRTT350J
by:
2017 Ford F-350 Super Duty

Ordered Timbren SES for 2017 F350 4x4. Hope to reduce sway when loaded with truck camper. Arrived in less than 48 hours. Installed easily. Will road test in a couple weeks.



- TFRTT350J
by:

The part fit perfect and was installed with no problem installation took 20 minutes The problem was that the part S had sharp burrs from manufacturing and should have been debuted during installation I got 2 cuts on my hand



- TFRTT350J
by:

Very easy to install! Wanting to test drive next!



- TFRTT350J
by:
2017 Ford F-350 Super Duty

Great product. Easy to install



- TFRTT350J
by:
2018 Ford F-250 Super Duty

The best. Good web page. Fast shipping.



- TFRTT350J
by:
2018 Ford F-250 Super Duty



- TFRTT350J
by:



- TFRTT350J
by:
2021 Ford F-350 Super Duty



- TFRTT350J
by:



- TFRTT350J
by:



- TFRTT350J
by:



- TDR1525H4
by:

Review from a similar Timbren Aeon Spring System in Vehicle Suspension


Highly recommend for anyone towing. Leaf springs were flattened out prior to install. Swapped the bump stops out for Timbrens in a campground before making a 1000+ mile trip home. They work amazing leveled the truck out while towing and absorb the bad bumps.


Comments
I would absolutely buy the Timbren SES again if I didn’t already have them. No issues after a year.
David B - 08/23/2021

31
3870
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Ask the Experts about this Timbren Vehicle Suspension

  • Can Spacers Be Added To Timbren Service Duty Model for 2020 Ford F-350
    The correct Timbren Suspension Enhancement System for a 2020 Ford F-350 is part # TFRTT350J for service duty applications and part # TFR350SDJ for standard duty applications. The service duty models are smaller in height but more dense so they offer more support. The only time the service duty models should be used is with an in-bed camper in which case the truck would be loaded all the time so your space between the spring and contact point would be little to none. If you want to use...
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  • How Tall are The Timbren Kits that Fit 2020 Ford F-250
    We have two Timbren rear suspension kits that fit your 2020 Ford F-250 we have the standard duty # TFRTT350J which has a spring height of 3-9/16 inch and a bracket height of 2-3/8 inches. The severe duty # TFR250SDJ is 3-5/8 inches tall and has the same bracket height of 2-3/8 inches plus a 1 inch spacer. Timbren states that once a system is installed you will need 1/2 inch to 1-1/2 inches of space between the bottoms of the springs and the top of the axle. So that's why the higher...
    view full answer...
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  • Best Timbren Suspension Enhancement for 2019 Ford F-250 Super Duty With Constant Load
    For your customer with a 2019 Ford F-250 Super Duty with a consistent load in the bed of the truck the best Timbrens are the Timbren Suspension Enhancement System # TFR250SDJ. These have an 8,600 lbs capacity so they are going to offer a ton of support and help with the handling and sag that your customer is having trouble with but without making the ride really rough. There is another kit, the Timbren Suspension Enhancement System # TFRTT350J, but these are extremely rigid, don't have...
    view full answer...
  • Do Timbren Suspension Enhancement Fit 2020 Ford F-350 FX4
    Unlike some air bags, the Timbren Suspension Enhancement springs do fit the FX4 models of 2020 Ford F-350, as there is no interference with the suspension. That said, the model you asked about, the Timbren # TFRTT350J, are not the correct kit for a standard truck, as those are designed for severe service vehicles like a tow truck. The correct Timbrens for your 2020 Ford F-350 FX4 for towing campers or hauling equipment are the following: - Timbren Suspension Enhancement System #...
    view full answer...
  • Spacer Kit for Timbren Kit that Fits 2021 Ford F-350
    To get the gap close enough between the axle and the Timbren kit you installed you would want to install the spacers like you mentioned. For that we have the 1 inch spacer part # A25723-90AH00 and the 1/2 inch spacer # TA25723-90AD00. To pick out the correct bolt length you'd want to take the bolt you have now with you to a hardware store and buy one that is 1-1/2 inches longer than what you have now that is Grade 8. If for some reason you feel the ride quality is too harsh you could...
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  • Recommended Rear Suspension Enhancement For 2021 Ford F-350 4WD Towing 35' Gooseneck Horse Trailer
    The Timbren Suspension Enhancement System - Rear Axle # TFRTT350J you were looking at will fit your 2021 Ford F-350 4WD but are very stiff and will lead to a very harsh unloaded ride. Instead I recommend the SumoSprings Rebel Custom Helper Springs - 2 Piece - Rear Axle # SSR-128-47-2 which offers 4600lbs of load leveling support which will be perfect for providing support to the rear suspension of your F-350 when towing your 35' LQ Gooseneck Horse Trailer. These springs are progressive...
    view full answer...
  • Comparing Timbren Suspension Kits for 2019 Ford F-350
    For the rear suspension of your 2019 Ford F-350 there are two different Timbren suspension kits available. The heavy duty version part # TFRTT350J and the lighter duty # TFR350SDJ. The HD version is basically for severe duty applications like tow trucks or other applications where the truck will be basically at capacity at all times. If your application is more like recreational towing and wouldn't be at the capacity all the time the lighter duty option is the way to go.
    view full answer...
  • Timbren Rear Suspension Enhancement System Compatible with 2017 Ford F-350 Super Duty
    First of all, thank you for your service. Unfortunately at this time we don't offer a military discount, but we do have free shipping most of the time on orders like this one. To confirm your fit, we have two sets of jounce springs available from Timbren that are confirmed to fit your 2017 Ford F-350 Super Duty. The Timbren Suspension Enhancement System - Rear Axle # TFRTT350J with a weight rating of 8,000 lbs and the # TFR350SDJ rated for 8,600 lbs. These springs will have a slightly...
    view full answer...
  • Best Timbren Suspension Enhancement System for a 2017 Ford F-250 with Truck Bed Camper
    I spoke to my contact at Timbren and they stated that the Timbren Suspension Enhancement System part # TFRTT350J is actually designed for service trucks or in your case trucks with a truck bed camper. Therefore, this will be the perfect kit for your 2017 Ford F-250. I also informed them that you currently have 8" of space between your frame and axle plate to which they stated that would give you a distance of 1-1/4" between the bottom of the spring and top of the contact point on your...
    view full answer...
  • Leveling 2019 Ford F-250 with Service Body
    The Timbren suspension enhancement # TFRTT350J is the easiest to install option to level your 2019 Ford F-250. This system is designed to be under a constant heavy load like what you have with your service body. The two springs work independently of each other so they're great at fixing the lean your truck is doing because of the off-center weight. To install the Timbrens you remove your current factory bump stops and put the Timbrens in their place. Once they're installed they're...
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  • Suspension Enhancement Recommendation for 2019 Ford F-250 with Fifth Wheel Rail Kit
    For your 2019 Ford F-250 with a fifth wheel hitch rail kit installed in the bed of you'd need to go with a Timbren kit part # TFRTT350J for suspension enhancement. The air bag kit install brackets won't fit with the fifth wheel rail brackets as they occupy the same portion of the truck frame. The Timbrens are a great solution though as they give you the same support and don't require you to ever have to inflate any bags. They basically are there when you need then and when not needed you...
    view full answer...
  • Are Timbren Spacers Required for a Leveling Kit on a 2017 Ford F-350
    Generally speaking, most leveling kits lift the front of the truck 1-2" to match the rear as the factory ride height on most pickup trucks nowadays is about 2" lower in the front than in the rear. This is usually to compensate for squatting while towing with a trailer. As long as the rear of the truck is not lifted then you will not need to use a spacer when installing the Timbren Suspension Enhancement System part # TFRTT350J on your 2017 Ford F-350. However, if the the leveling kit...
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  • Timbren Jounce Spring Clearance to Axle in Ford F-250
    You have your Timbren jounce bumpers installed correctly in your F-250. The ideal spacing from the bottom of the spring to the top of the axle is right around that same half-inch that you have. In some applications the gap can be larger but 1/2-inch is within spec. This is enough of a gap that the springs will not engage when the truck is unloaded but close enough that the springs will engage the axle when there is a load, either cargo in the bed or trailer tongue weight.
    view full answer...
  • Availability of Spacers for Timbren Springs on Lifted 2019 Ford F-250
    The Timbren Suspension Enhancement System # TFRTT350J referenced in your question is confirmed to fit your 2019 Ford F-250 and will do a great job of adding support to the rear axle. If you have a true suspension lift on your F-250 where the axle was actually moved further from the frame then you will likely need to add a spacer. These are available in 1 inch # A25723-90AH00 and 1/2 inch # TA25722-90P00 sizes. You basically just need to use the amount of spacers that it takes so that...
    view full answer...
  • Is It Okay if Timbren Kit part # TFRTT350J Isn't Perfectly Centered over Axle
    You are totally fine. Thanks for sending in the picture of your Timbren kit part # TFRTT350J installed, and while it is not sitting perfectly square on the axle it is close enough to provide enough contact needed to work well. Due to how vehicles flex through the chassis, suspension, and frame bushings there might be a bit of variance in how the Timbren comes down and hits the axle every time.
    view full answer...
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  • What Causes a Trailer to Bounce/Porpoise on Highway
    Porpoising (bouncing like you described) and sway are both commonly caused by the same thing when towing and that is not enough tongue weight for the trailer relative to the total amount of weight the trailer weighs. You need the tongue weight to be between 10 and 15 percent of the total trailer weight for the porpoising to stop. Suspension enhancement would actually cause the bounce to be more severe so I would not recommend going that route. I'd get the tongue weight checked and also...
    view full answer...
  • Suspension Enhancement Recommendation for 2017 Ford F-250 with Pull Rite Rail Kit 2766
    Firestone lists their Ride Rite Kit part # F2600 as a confirmed fit for your 2017 Ford F-250 with an in-bed hitch rail kit like the Pull-Rite setup you have. But looking up the install instructions for your Pullrite ISR 2766 they use a very large bracket that mounts to the outside of the frame where the Firestone kit would interfere with. Instead your best option would be the Timbren suspension kit part # TFRTT350J which installs in an area that would allow your Pullrite rails to fit.
    view full answer...
  • Suspension Enhancement Recommendation for 2017 Ford F-350
    I'd first make sure you aren't exceeding the capacity of your truck as 4 inches of squat for a 1 ton truck is quite a bit. Assuming you are within the capacities of your vehicle your best option is to use suspension enhancement to bring the rear suspension. Changing the ride height makes suspension enhancement installs more complicated and then it also makes towing the trailer level with enough bed rails clearance difficult too. Air suspension would be your best option since it will...
    view full answer...
  • Will The Timbren Suspension Enhancement Work On 2022 Ford F-350 FX4 Trim Level
    Yes, the Timbren Suspension Enhancement springs, # TFRTT350J will fit the 2022 Ford F-350 FX4. You will have no interference with the OEM suspension. With the Timbren Suspension Enhancement System, each hollow rubber spring works independently to support the driver's or passenger's side of the vehicle. Each spring is activated when it is needed, so body roll is greatly reduced. I have added links to product review videos, please see below.
    view full answer...
  • Recommended Suspension Enhancement for a 2019 Ford F-250 Towing a 5th Wheel
    Between the Roadmaster Active Suspension Custom Leaf Spring Enhancement Kit # RAS3611-SLHD and Timbren Suspension Enhancement System # TFRTT350J, I prefer the Timbren. Though both of these are set it and forget it products, the # TFRTT350J does provide more support when needed. The draw back to both of these systems is that they are not adjustable and will affect the ride pretty severely when not towing. With that being said, I prefer the Firestone Ride-Rite Red Label Extreme Duty Air...
    view full answer...
  • Can You Use Spacers With Service Duty Timbrens On a 2022 Ford F-350
    Yes, you can add spacers to the Timbren Suspension Enhancement System part # TFRTT350J which is the service duty model designed for a 2022 Ford F-350. The correct spacer will be the Timbren Spacer part # A25723-90AH00 for 1" or part # TA25722-90P00 for 1/2".
    view full answer...
  • Recommended Timbren Set for a 2019 Ford F-350 Dually
    Figuring out which Timbren is the best for your set up is really dependent on how much support is needed. With the # TFR350SDJ having the load leveling capacity of 8,600 pounds, it is designed for heavy duty use. Granted the # TFRTT350J is as well, but is is not as heavy duty. So if you were looking for the most heavy duty option, you got the correct part.
    view full answer...
  • Questions About Timbren Jounce-Style Springs for 2017 Ford F-250 Super Duty
    It is true that the 8,600 lbs capacity Timbren Jounce-Style Springs # TFR250SDJ measures 6-7/8" altogether while the 8,000 lbs capacity Timbren # TFRTT350J for heavy duty (Severe Service Vehicle) applications measure 7" altogether. I went out to the warehouse and double-checked these measurements just now. The 1" space for the # TFRTT350J kit is optional and does not have to be installed. I know it seems a little weird about the pricing, but it is important to remember that these...
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  • Correct Timbren Rear Suspension Enhancement System For a 2020 Ford F-350 Super Duty
    The correct Timbren Rear Suspension Enhancement System for a 2020 Ford F-350 Super Duty is part # TFR350SDJ which works on both 2WD and 4WD models. The Timbren Suspension Enhancement System part # TFRTT350J is for models with constant loads like service bodies or truck bed campers therefore, not ideal for towing or hauling. The Timbrens are actually one of the most popular suspension enhancement systems on the market due to both cost and ease of installations. Furthermore, they will provide...
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  • Timbren Suspension Enhancement 2020 Ford F-250 Severe Service Kit
    That is a fantastic question. The Timbren # TFR250SDJ is their standard use suspension enhancement system. This is best suited for general everyday use. The Timbren # TFRTT350J is their severe service kit. Per Timbren- We recommend Severe Service kits be used with a slide-in camper or salt spreader. In fact, any application that requires maximum stability (reducing roll and sway) calls for a Severe Service upgrade. While both will fit your 2020 Ford F-250 4x4 the one you choose will...
    view full answer...
  • What are the Heights of the Timbren Rear Axle Helper Springs for a 2020 Ford F-250
    The springs in kit # TFR250SDJ are 4-1/2 inches tall and for kit # TFRTT350J they are 3-9/16 inches tall. These measurements do not include the mounting brackets that attach to the bottoms of the frame which are approximately 2-3/8 inches tall. The Timbren # TFRTT350J are designed more for commercial duty where your truck bed stays loaded for long periods of time.The Timbren # TFR250SDJ is a more standard duty spring that is ideal for towing applications where you may be experiencing...
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  • Recommended Timbren Rear Suspension Enhancement for a 2017 Ford F-350
    For your 2017 Ford F-350, you have two options. You can go with either the Timbren Suspension Enhancement System part # TFR350SDJ or part # TFRTT350J. I recommend using the Timbren Suspension Enhancement System part # TFR350SDJ as these aeon springs are rated for a higher weight capacity and are made of a thicker rubber. The hollow rubber springs sit above the rear axle below the frame to help stabilize and provide up to 8,600 lbs of load support capacity. They are designed to provide...
    view full answer...

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