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

Timbren Suspension Enhancement System - Rear Axle

Our Price: $269.36
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6,000-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. Great Prices for the best vehicle suspension from Timbren. Timbren Suspension Enhancement System - Rear Axle part number TNRTTNB can be ordered online at or call 1-800-940-8924 for expert service.
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Timbren Vehicle Suspension - TNRTTNB

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

6,000-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.


  • 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
    • Becomes more rigid as more weight is added for 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 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 a simple installation
    • Installs directly onto frame
    • No drilling required


  • Load-leveling capacity: 6,000 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.

NRTTNB Timbren SES with Aeon Hollow Rubber Springs - Rear Axle

Installation Details TNRTTNB Installation instructions

This Product Fits The Following Vehicles

Customer Satisfaction Score:

Customer Reviews

Timbren Suspension Enhancement System - Rear Axle - TNRTTNB

Average Customer Rating:  4.7 out of 5 stars   (5767 Customer Reviews)

6,000-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.


Odelia K : Excellent Customer Service!! Timbrens perfect fit!

2018 Nissan Titan

Timbren operats flawless. About an inch of clearance after installation. Installing these on my 2018 Titan pro4x (non XD) was not a bolt on installation. The hardware provided was not the same that I took out of my truck. I had to tap the nut in the frame starting with a M8-1.25, Then tap using M9-1.25, then finish off using M10-1.5. The bolt provided did not have enough thread on it (timbren was not tight to the frame), so I made an additional 1 inch of thread to the bolt, then everything went together smoothly. Ride is just like factory, until the 1 inch gap closes. I am still happy with the timbrens despite installation.

Nissan Titan

This is a great system for keeping the rear end of my 2021 Nissan Titan CC Pro-4x from sagging when carrying heavier loads and the accompanying tongue weight. Towing feels solid, even at 8k lbs+ trailer weight. After a 3" lift, I ordered spacers to make up the difference and it continues to perform well. I would definitely recommend.


These work like a champ. Ten minute install and removes the rear end squat straight away.


They are fine when empty or with a heavy load but beat you to death with a light load. If I had to do it over again I would choose airbags for my application.

Etrailer Expert

Heather A.


The jounce style Timbren springs are made of dense rubber so they can create a rougher ride. I recommend air bags for the 2021 Nissan Titan with part # AL57331. The Air Lift LoadLifter 5000 springs are designed to adjust the air pressure from 5 psi - 100 psi to adjust for a heavy or light load. An air compressor system part # AL25856 makes it more convenient to put air in the bags compared to stopping for air when you want to adjust the air pressure. This system is dual path so you can also adjust each side of the truck bed individually to balance the load. Please keep in mind these air bags are not compatible with a in-bed hitch like a fifth wheel or gooseneck.

Nissan Titan

Installation went good except the bolts sent with were too big to fit into the factory Nissan Titan holes. Used 13mm bolt and worked fine. Overall very pleased.

2018 Nissan Titan


2019 Nissan Titan

Easy installation. 15 mins total time. Highly recommended if tow anything.


I haven’t installed yet but what really impressed me was how quick they responded to my order and got it out the door




Works like a charm. Along with my hitch I no longer have rear sag.

Etrailer Expert

Mike L.


@Richard We're glad you're happy with your # TNRTTNB Timbren helper springs!


No difference at all, did not help me.


They do what they should do

2019 Nissan Titan

2022 Nissan Titan



About a 1/2 inch difference in gap at the bump stop perch but still within parameters. Truck sits perfect with trailer attached. Haven’t towed yet. After towing if they perform like they should will upgrade to a 5 star. Easy to install, definitely needed 2x4 and jack. 2011 Silverado ext cab with 30 ft Genisis 5th wheel.


Haven’t had it on long, but so far so good. 1999 F350 dually. Bolted up nicely. Total job took 10 minutes. Have hauled two gooseneck loads of hay and truck drives SO much better. Nice and level. Money well spent so far.


very good product ,received just in time and fit perfectly on my GMC savana 2000 .Be sure to clean the two receptacle thats help.
très bon produit , reçu dans les délais et s'ajuste parfaitement . Assurez-vous de nettoyer le receptacle cela facilite l'installation.


I know it will be lovely when loaded or the trailer on. However,it rides like a wagon empty with brand new premium shocks and struts empty. Thud thud thud. You really cannot feel the shocks or suspension. Found exact same item plentiful for 60 bucks on eBay after I bought these for 250. I may cut these in half or put air bag on. I do not like the ride empty. No hard feelings. It is a good product maybe just not for me.


The timbrens actually did what they were suppose to do. However, once I starter driving out west I notice the timbrens were riding on the axle which cause the speedometer to jump around depending on the road. I would recommend them if you are hauling or towing a camper or RV. I was going to contact etrailer about maybe removing a spacer for one set however the other set came as one unit. The bottom line is the Timbrens does stabilize your load for safe travels. I will be contacting etrailer soon to assist in correcting the problem...Road trip from Idaho,Colorado,Wyoming,and Utah were beautiful... Thank you etrailer


I’d seen similar products rated in the 4,000 lb ratings but I went with these. I’m not a mechanic but I removed the factory bump stops and installed both these in 30 minutes or less. I used my rolling jack and lifted from the drop hitch and easily removed the old ones and soapy water and 1/4 twist and these were on. Placed a block of wood in the space between these coils and lowered the jacks then pressed it with my tractor to confirm full engagement. I carry a lot of tools on a 2020 Chevy 2500 I do feel a bit of butt bounce on large bumps but other than that I’m very pleased.


Easy install took about 20 minutes on my 2017 Ram 3500 SRW. Had about 1/2 inch clearance as recommended. Loaded up my 5th wheel (2350 hitch weight) and about 200 lbs of gear in the bed. Just got back from a 800 mile camping trip through mountains of TN. You can really feel the difference around those sharp corners and uneven surfaces. The truck felt firm and controlled not hard and jarring as some have mentioned. Going over those overpasses with the wonderfully smooth (Not) joists was greatly improved. The truck would squat and rebound again, with a firm controlled response. Driving without a load felt the same as before without them. I would highly recommend these! Ordering from etrailer continues to be my go to option!


The Timbren rear bump stops for 2020 Suburban were great quality and fit perfectly in the replacement of the original ones with no problems. The old ones pulled right out by hand with no hassle. When I installed the new ones I put 2x4 blocks that I cut underneath the bump stops. Then hooked up the 6,400 lbs travel trailer with about 750 lbs of tongue weight on it and they pressed right into place. The Suburban was more stable because it had less swaying while towing. I also gained about 1 inche more in the fender gap which means less rearend saging.


Despite reading about the popularity in using Timbren’s for suspension modifications to assist in ride quality when loading up the Odyssey, I haven’t found many reviews about the Timbren’s for 4th gen Odyssey though there are a ton of positive reviews for the 5th gen Odyssey on the forums and internet.

I went with Timbren’s due to the “set it and forget it” lack of maintenance. I do notice a more stable ride even unloaded at highway speeds. There’s less sway in on/off-ramps and big sweepers. Not a huge change, but warmly noticeable. About the same quality of change one might experience from buying a brand new set of tires vs. not dangerously worn down tread. Where it really shines is under load/heavy cargo.

Before Pic (unloaded mulch); After Pic (loaded) - definitely not as much squat as with the prior OEM bump stops! Comfortable ride with less jostling/sway and haven’t bottomed out the springs over rough road. I’m impressed! Install was fairly easy, about 45 min per side taking my time, cleaning removed parts. One year later, I haven’t had any issues, and I feel very comfortable loading the minivan with all our gear/stuff.

I do not tow.


I don't usually write reviews but in this case I have to. I have been using these springs for about a year now and they work exactly as advertised. I carry a truck camper on my truck from March until November. Once I loaded my camper the truck sagged very noticeably. I tried the Roadmaster Active Suspension (don't waste your money) before I discovered the Timbren springs. The Timben springs installed easily, eliminated the sag and gave the truck a much more stable ride because it eliminated the side to side rocking in the back. If you are thinking about getting these, you will not be disappointed.

Show More Reviews

See what our Experts say about this Timbren Vehicle Suspension

  • Which Timbren SES System for 2017 Nissan Titan SL
    For your 2017 Nissan Titan SL you will actually need the # TNRTTN and not the # TNRTTNB, which is only designed to fit on the 2017 Nissan Titan Pro-4x. The difference isn't the ride height, but the available mounting spots for on the two trucks are slightly different. This system will install on your rear axle and provide you with a great system to help reduce vehicle sag when towing or carrying heavy payloads.
    view full answer...
  • Timbren Suspension Enhancement Fit for 2020 Nissan Titan With 2-Wheel Drive
    I checked with Timbren for you, and while we do have a fit for a 2020 Nissan Titan with 2-wheel drive, the part # TNRTTNB is only a fit for the 4-wheel drive 2020 Nissan Titan Pro-4X. For your '20 Titan with 2-wheel drive, I confirmed with Timbren that part that fits your truck is the Timbren Rear Suspension Enhancement System # TTORTUN4. There will be no modifying needed, and the Timbrens will do a superb job of improve your Titan's handling and performance by supporting its suspension...
    view full answer...
  • Suspension Enhancement Recommendation for 2017 Nissan Titan 2 Wheel Drive
    For your 2017 Nissan Titan 2 wheel drive we have great suspension enhancement kits available like the RoadActive Suspension Kit part # RAS4611 but we do not have a Timbren kit or air bag kit that fits your truck due to it being 2 wheel drive. All of those fits are for the 4 wheel drive models. The RAS kit I mentioned really is a great option that I know you'll like. It gives you adjustable support like the air bag setups and is also not quite as harsh as some of the Timbren applications....
    view full answer...
  • Comparing Timbren SES to SuperSprings Sumo Spring Solo Custom Helper Springs for 2017 Nissan Titan
    It's not quite a Ford vs Chevy or Nike vs Adidas argument since there are some functional differences between the suspension enhancements available for your 2017 Nissan Titan SL. The Super Springs Sumo Springs Solo Custom Helper Springs # SS95GR and Timbren SES # TNRTTNB are going to provide different levels of support. The Super Springs are going to do a better job of not affecting the unloaded ride quality since they get progressively stiffer as more weight is applied to them, where...
    view full answer...
  • Timbrens or SumoSprings for 2019 Nissan Titan
    Since Timbrens are notoriously harsher than SumoSprings and the truck will be unloaded for most of the year I would recommend the SumoSprings for your 2019 Nissan Titan with the part # SS95GR. This will give you the support you are looking for without destroying your unloaded ride quality.
    view full answer...
  • Should I Use Timbren Or SumoSprings Suspension Enhancement On My 2020 Nissan Titan Pro-4X?
    You are on the right track in looking for jounce springs, as this will reduce your Titan's rear sag and also improve the overall handling of the truck while reducing body roll. Jounce springs are also very easy to install and require no maintenance, unlike air bags. When deciding between Sumo Springs and Timbren, it really comes down to how much weight you will be adding to the bed of your truck. It sounds like SumoSprings Solo Custom Helper Springs - Rear Axle # SS95GR is the kit for...
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  • Timbrens or SumoSprings. Which One is Better for a 2020 Nissan Titan 4WD?
    I strongly recommend going with the SumoSprings Helper Springs item # SS95GR over Timbren's like item # TNRTTNB for your 4WD 2020 Nissan Titan. Both systems will support your rear end and keep your truck level while towing but you won't notice the SumoSprings when you are not towing. The Timbren's will be rough and stiffen up your suspension. You'll feel them going over every bump. I have linked a review video below.
    view full answer...
  • Air Springs or Timbrens for 2014 Nissan Titan Pro-4X With Equal-i-zer Weight Distribution System
    Using the Equal-i-zer Weight Distribution Hitch # EQ37100ET will be a great help to your 2014 Nissan Titan Pro-4X and a suspension enhancement is compatible with these systems. Between air springs and Timbrens the better option is the Timbren Suspension Enhancement System # TNRTTNB. These are designed specifically to fit your 2014 Nissan Titan Pro-4X and since suspension enhancement is only going to come into play on occasion with your weight distribution system, the Timbrens offer the...
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  • Installing Timbren Rear Suspension Springs on a 2021 Nissan Titan With Rough Country Lift
    The Timbren Suspension Enhancement System # TNRTTNB is designed to only fit a stock suspension height on your 2021 Nissan Titan. You can use the Timbren 1" Spacer # A25723-90AH00 to space out the Timbren for the Rough Country lift since they use lift blocks to gain your rear lift and are not using new leaf springs with different characteristics. We also have the Timbren 1/2" Spacer # TA25722-90P00 that can fine tune the height if needed.
    view full answer...
  • Recommended Helper Springs for 2012 Nissan Titan Pro-4X
    I'm really glad you asked because we only have one confirmed fit for the Pro-4x model. It is the Timbren Suspension Enhancement System - Rear Axle # TNRTTNB which is a jounce style enhancement rated for 6,000 lbs load support. It will give you a progressive support as it provides additional support as needed to increase stability while reducing body roll and vehicle sag. It will not change the factory ride when not hauling a load, but will engage as needed for payload and towing.
    view full answer...

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Info for this part was:

Employee Jeff D
Installed by:
Jeff D
Employee Jameson C
Expert Research:
Jameson C
Employee Jacob T
Video Edited:
Jacob T
Employee Wilson B
Updated by:
Wilson B
Employee Michael B
Updated by:
Michael B
Employee Carrie F
Updated by:
Carrie F
Employee Bethann B
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