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  1. Vehicle Suspension
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  4. Rear Axle Suspension Enhancement
  5. Extra Heavy Duty
Timbren Rear Suspension Enhancement System

Timbren Rear Suspension Enhancement System

Item # TDR5500
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TDR5500 - Extra Heavy Duty Timbren Rear Axle Suspension Enhancement
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12,000-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 Rear Suspension Enhancement System part number TDR5500 can be ordered online at or call 1-833-496-1390 for expert service.
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Timbren Vehicle Suspension - TDR5500

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

12,000-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
      • 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


  • Includes 2 Aeon hollow rubber springs, vehicle-specific brackets and hardware for simple installation
    • Replaces axle bump stops on frame
    • No drilling required
  • Capacity: 12,000 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.

When hauling heavy loads in the cargo area or by pulling a trailer, you will often see the rear of the vehicle 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 vehicle's weight as well. Because less weight is on the front axle, the front tires are making less contact with the road. Overall vehicle handling - traction, steering, and braking - is negatively affected. The resistance from Timbren's Suspension Enhancement System works with the vehicle's factory suspension to keep the vehicle level and improve your driving performance.

Diagram of the Timbren spring installed

The Timbren system has a vehicle-specific 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 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 provides increased resistance, stiffening the suspension and keeping the vehicle 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 the 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 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 helping 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 passing of a semi) because the movement from the trailer is not transferred to the vehicle. This also works to make the sway subside quicker.

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 as 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 - no air hoses are needed to be run, no compressors or gauges to hook up, and no manual adjustments necessary. The rubber construction causes Timbren's springs to be more elastic than similar products constructed of micro-cellular urethane. More elasticity allows for a more comfortable ride because the rubber has more travel.

DR5500 - Rear Suspension Enhancement System with Aeon Hollow Rubber Springs by Timbren

Installation Details TDR5500 Installation instructions

This Product Fits The Following Vehicles

Video of Timbren Rear Suspension Enhancement System

Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.

Video Transcript for Timbren Rear Suspension Enhancement System Installation - 2016 Ram 4500

Speaker 1: Today on our 2016 Ram 4500 we're going to be taking a look at and showing how to install the Timbren Rear Suspension Enhancement System, part number TDR5500.If you ever hauled a heavy load or had a big trailer behind your Ram, you've probably experienced what a lot of us do where the backend starts to squat down and we may get a little bit of sway and some body roll back there. When that squatting happens, we're putting a lot of unwanted strain and stress on the rear suspension. It's going to wear things out over time, and really, our tires aren't where they should be and our suspension isn't where it should be either. Since the backend is getting pushed down, the front end is getting lifted up slightly, which means our tires aren't going to make full contact, we're going to have irregular tire wear, as well as our headlights being out of alignment.But upgrading the rear suspension is definitely going to help with that. It's going to support the load back here and keep our suspension where it should be, nice and level. And it's going to prevent as much squatting.

It's also going to help with body roll because it's going to be able to counteract that and not sway so much. Since it's not pushing down so hard and we have that extra support in the back, it's not lifting up so much in the front so we'll have better tire wear, better steering response, and our headlights will be realigned.Now that we've gone over some of the benefits and seen what they look like, let's show you how to get them installed. Here's what our Timbrens look like once we have them installed. These are going to provide us a lot better performance when we're hauling a heavy load or towing a heavy trailer because these are going to give us a lot more support and not solely rely on the rear suspension. Our Timbrens are going to mount in between the frame and the axle and provide support whenever the suspension starts to drop down.

When we're unloaded, it's not going to affect the ride quality because it's not coming in contact. But once it does, it's going to engage softly in the beginning. As it becomes more compressed, it's going to become stiffer, having a progressive rate.If we compare our factory jounce stops to our Timbrens, you can see there's quite a bit of size difference. Now what the Timbrens is going to do is, again, provide that support, while our factory jounce stops are really just there to prevent the truck from bottoming out and the axle from hitting the frame.Our springs are going to be made out of rubber so they're going to have a little bit of give to them but a lot of support. They're going to act as a shock absorber so we can have a more comfortable ride and not have to worry about the bumps and uneven terrain as much.

Our springs are going to work independently from each other from side to side, so it's going to help out a lot with those off-center loads. It's also going to help out with a lot of swaying that we may get from our trailer. Or if we go to make a sharp turn or any evasive maneuver, it's going to cut down a lot on that body roll.In our kit we're going to get two rubber springs, as well as the vehicle-specific brackets. We're not going to have to drill anything in order to get them installed. Our Timbrens are going to have a 12,000 pound capacity, but keep in mind these are not intended to increase the payload of your truck.

They're just there for extra support. So you never want to exceed the manufacturer's recommended weight.To begin our installation we're going to come to the rear axle. Right above that we'll have our factory jounce stop. I already went ahead and sprayed a little bit of spray lubricant on there, but it's always a good idea to soak it down because these bolts can rust because there's really not anything protecting them, especially if you have a salt truck like we have here.Then you're going to want to grab a 16mm socket and there's going to be a bolt on the backside as well as on the front of our bump stop holding it in place. We'll pull those out. Then you want to hold onto the hardware because we are going to reuse it. Now we can get ready to assemble the spring assembly.If we look inside the bottom of the large hole in our Aeon spring, you'll see that there's a washer inside of there. We're going to want to take our long bolt. You want to pass it through the spring so it comes out on the other side. But you want to make sure that it goes through that washer as well. It can be a little tricky. What I try to do is I just drop the bolt in so it'll land straight up, and maneuver it around with my finger to where it will drop through and engage that washer. You can see it's going to come out the other end. Then we'll take our spacer, slide that over the bolt. Then finally, we're going to have the top plate. There's going to be a weld nut inside of here. We're going to want to get an extension and a socket so we can attach all these pieces together.Now the easiest way I found to do it is if we take our assembly and we'll drop it down, get it as close as possible to lined up, then we'll take a 9/16 socket and extension and go through the spring and thread it into the bracket. You want to get that bolt tight enough to where it's not going to be moving around. You can see if you look inside the bracket that we have threaded the bolt going through the weld nut, and our Aeon spring's not spinning around, or our spacer block.Whenever you get ready to install these, you want to make sure you have the correct bracket, and it's facing the right direction. The oval hole that's solid is going to be going towards the front of your truck, and the slotted one is going to be going towards the back. Now you'll also notice that it's slightly offset from center. You want the holes to be towards the outside of the truck. It is going to be labeled. We'll have left with an arrow pointing front.Now to help us get these in place so we don't have to hold everything and try to thread the bolts in at the same time, if we take our bolt, we're going to thread it in a good way on the very back hole. That's where the slot in our bracket's going to come into play. We can just slide the bracket over the bolt and it'll hold itself up while we get the other one in place. We can come back with that same 16mm socket and snug up our hardware. Since we have limited space, you can fit a ratcheting wrench in here to tighten up that last bolt. Now that we have this side on, we're going to go ahead and repeat that for the other side as well. That'll finish up your look at the Timbren Rear Suspension Enhancement System, part number TDR5500, on our 2016 Ram 4500.

Customer Reviews

Timbren Rear Suspension Enhancement System - TDR5500

Average Customer Rating:  4.7 out of 5 stars   (4159 Customer Reviews)

12,000-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.


We’ve had airbags, super springs, and these timbren poly bump stops. I will only use these from now on! They are awesome!

2016 Ram 5500

Very easy install really leveled out the truck while towing


2019 Ram 5500


2012 Ram 5500

2021 Dynamax Isata 5 Motorhome


Review from a similar Timbren Aeon Spring System in Vehicle Suspension

I used this on my Isuzu tow truck. The blocks in and of themselves are fine, they support the weight. Here's the problem: They are pre-loaded, meaning that they always touch between the frame and the rear axle. As you load the vehicle this puts more pressure on the frame in this 5" area where the blocks are. The springs have not yet taken as much weight as they normally would. Now, all this upward pinpoint pressure bends the frame. This is what happened to me on my rollback tow truck. After many hours and now double plating the frame all is well again, but a tremendous amount of work. Yes, the blocks are fine, but the result of installing this product resulted in a bent frame. The vehicle was not overloaded and was within the GVWR.

I have reached out to the manufacturer who will be reaching out to you.
-- Etrailer Expert Jenny N - 01/20/2022


Review from a similar Timbren Aeon Spring System in Vehicle Suspension

Delivered a day early, easy installation, just what I was after for my 2010 2500,with a leveling kit 63 gal auxiliary tank,generator, tools, and the like in the bed,probably 1000 pounds or so,300 or so behind the center of the rear axel, not so much by choice just the way it had to be ,these got rid of that annoying little squat,much more satisfied with the stance with the tongue weight on it,easy order easy delivery , you can see the before and after, awesome product!!


Review from a similar Timbren Aeon Spring System in Vehicle Suspension

I really like these Timbren bump stops. I think the best thing about them is the simplicity, both how they work and how easy the install was. I bought these when I added a dump insert (similar to a salt spreader) into my 2019 F-250. I have loaded this truck heavy before with dirt and the truck sagged tremendously and had a lot of body roll. To prevent this with the now added dump insert, I installed these. Super easy to install! Took maybe 30 min. It reduces body roll and seems to improve the ride depending on how loaded the truck is.

One unfortunate consequence to the install is that the Timbrens brought to light that I have a weak leaf spring on my passenger side, which was suspect previously.

Overall, I'm very pleased with this purchase and would buy again!


Review from a similar Timbren Aeon Spring System in Vehicle Suspension

Product is high quality, all parts fit well and I didn’t have to force anything. High strength thick steel, and the jounce bumpers are seriously heavy duty. I haven’t had a load on the truck (98 Ram 3500) since install a few days ago, so they haven’t touched the base plates yet.

One thing I’m concerned with is the jounce bumpers are touching and are right up against the lift blocks and U bolts. I’m unsure of the longevity these bumpers will have after a heavy load is on them and they are constantly rubbing on the hardware. Also, as the load gets heavier they expand outward as they flatten out so I’m also concerned with if that will push my lift blocks outward and mess with the suspension.

I’m prepping for a slide in camper and when I get it I will have to take a look and see what effects that weight has on the suspension, the bumpers, and ride quality.

I am not sure when I will be able to have a load on it to confirm, as I do not have a camper just yet. I am currently working on upgrading the suspension in preparation for one. Is there an alternative similar solution, other than airbags - as I dont want those, that can be run? With a similar weight capacity? Kind of interesting Timbren hasnt run into this issue before with the older Ram 3500s. Wonder if this is somehow unique to my truck? All the rear components are original OEM, so it seems kind of strange.
-- comment by: Jimmy - 01/05/2022
You mentioned that the jounce bumpers were touching up against the lift blocks without a load in the truck and I wondered if you could send a picture of the installation?
-- Etrailer Expert Jenny N - 01/05/2022
I do have additional questions for you. Is the top picture showing how the springs look with a loaded weight? Have you already installed your slide in camper? I wanted to see if the top bracket were touching as well? The manufacturer is trying to determine if a smaller diameter spring would help or not
-- Etrailer Expert Jenny N - 01/05/2022
Both pictures are right after installation with a completely unloaded bed. Since installation, I have not had weight in the bed, so I can not 100 say if the top brackets would touch the U bolts or leaf springs. But from looking at it just now, it appears the top bracket would just barely touch the U bolts with a loaded bed, and would definitely touch if there was side to side movement with a loaded bed like going over a speed bump, pot holes, or uneven terrain.
-- comment by: Jimmy - 01/05/2022
I did hear back from Timbren. Currently there is not a bracket that would be narrower that they can offer. When loaded if the brackets interfere with the smaller spring, then it may be advisable to return the kit.
-- Etrailer Expert Jenny N - 01/05/2022
I am not sure when I will be able to have a load on it to confirm, as I do not have a camper just yet. I am currently working on upgrading the suspension in preparation for one. Is there an alternative similar solution, other than airbags - as I dont want those, that can be run? With a similar weight capacity? Kind of interesting Timbren hasnt run into this issue before with the older Ram 3500s. Wonder if this is somehow unique to my truck? All the rear components are original OEM, so it seems kind of strange.
-- Etrailer Expert Jimmy - 01/05/2022
I was researching if I had an alternative and I realized that I needed to confirm your set up. Do you have the 3500 cab and chassis - if yes was it always a cab and chassis - or do you have the 3500 pickup? I am under the impression that you have the pick up since you want to use a slide in camper however, I wanted to be sure.
-- Etrailer Expert Jenny N - 01/05/2022
It is the 3500 pickup. Thanks!
-- Etrailer Expert Jimmy - 01/05/2022
I believe I now know what happened and I should have asked about the truck before now. The TDRTT3500 that was ordered is used for the cab and chassis model versus the pickup and this is leading to the fitment issues you have seen. I do have two options to offer for the 1998 Dodge Ram 3500 pickup including a different Timbren application. They are part # TDR3500
Timbren Rear Suspension Enhancement System
and part # SSA25
SuperSprings Custom Suspension Stabilizer and Sway Control Kit
-- Etrailer Expert Jenny N - 01/05/2022


Review from a similar Timbren Aeon Spring System in Vehicle Suspension

First, this is the third truck have have put Timbren SES on, so I am a big fan of this option for a pickup truck. There is no impact to the ride when the bed is empty, when loaded it is a big improvement keeping the truck is a level position, reduced sway.. I would have given this 5 stars, except the lower bracket is rusting. All the other parts are painted black except this one part - see picture... This is after one year, truck is parked in a garage in NC (not a high snow/salt state)...

I continue to be a fan, on my 1019 f150, I used the 1 in spacer, works perfect ! I have dumped 2200 lbs of stone in the bed a few times, no problem.
KLM - 01/05/2022


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.

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


Review from a similar Timbren Aeon Spring System in Vehicle Suspension

I haven’t hooked up to the fifth wheel yet or else it might be a 5 star. Based on the 15 minute installation time and the price compared to air bags this appears to be a logical way to go. I will update this as I hook up and put a load on it.


Review from a similar Timbren Aeon Spring System in Vehicle Suspension

Great addition to my 2018 ram 1500 I also installed Bilstein 5100 shocks and heavy duty coil springs along with the bump stops


Review from a similar Timbren Aeon Spring System in Vehicle Suspension

Installed on 98 Ram 3500 pickup. Haven't put a load on it yet, but it installed very easily and fits well. Driver's side spring brackets were a bit harder to install than the passenger side, but still overall easy.

One con was the powder coat finish was worn off in spots right after opening the box. Not sure if the packaging is to blame or what, but in general the packaging never seems to be that great on the etrailer products I've ordered (just brown packing paper).

Please cover any bare metal with anti-corrosive paint to prevent excess rust. Follow more tips in this help article:
-- Etrailer Expert Sierra K - 01/18/2022


Review from a similar Timbren Aeon Spring System in Vehicle Suspension

I have a 2018 GMC Sierra 1500 pick up truck (elevation package) in which I added a 3.5 inch ROUGH COUNTRY KNUCKLE LIFT KIT with Front Struts. The rear distance between the bump stop's metal cup just under the frame and the the rear axle is 8.25 inches with an empty truck bed and a quarter tank of gas. I gave the professional this information on my truck and what I needed; they e mailed back the kit with only 1.5 additional spacers on each side of the truck, Ok. I still came up with 2.25 inch space with an empty truck bed on both sides. I feel More TIMBREN PRODUCTS WOULD be SOLD if websites carried information All together for the average people to buy at their finger tips. It would have been easier for me if the following were all grouped together for my truck :
TIMBREN Rear Suspension Enhancement System
TGMRCK15S (that has 3/8 bushing) which is actual about 4.5 inches not 5inches in
FOR TRUCKS with LIFT KITS spacers are required with the same 3/8 bushings

1 inch spacer (that has 3/8 bushing) A25723-90AHOO
1/2 inch spacer (that has a 3/8 bushing) TA25722-90POO
I required an additional 1 inch spacer on both sides than I was e mailed. It would also be easier if I could buy the additional bolts grouped with my additional 2.5 spacing on both sides of my truck on the web site, than going to the hardware store. I would pay the additional cost. So all together for my 3.5 ROUGH COUNTRY LIFT, I required 2.5 inch spacers on both sides with the 4.5 height kit which = 7 inches . I haul my 4 wheeler in the bed and broke a level spring years ago. On other occasions I place fire wood in the truck bed. TIMBREN is the way to go, it will be there when I put weight in the bed of truck; be it a 4 wheeler or wood. Friends of mine have air bag systems that leak over time and are much more in price. You can not go wrong with TIMBREN. When installing, remove salt and sand near top of original bump stop bolt, apply PB blast wait 10 minutes use a breaker bar with easy removal. Go to the hardware store to get longer bolts. When installing have to jack up the back of the truck under the towing package to get space to use tools to add new TIMBREN PRODUCTS.

Awesome for hauling four wheeler in bed and for hauling load of fire wood in the bed, no broken leaf springs and no sag
Joe - 03/23/2022


Review from a similar Timbren Aeon Spring System in Vehicle Suspension

This Rear Suspension Enhancement kit were so easy to install, I was almost sure I missed something.
They installed in less than an hour. I was able to place my floor jack under the ball mount to raise the rear end enough to remove the old mounts and simply install the new ones.
Hooked up my 28' rv to my Silverado 1500 and they worked as advertised. No front end sag and I feel safer towing it.
Customer service helped me find the right product I needed without dishing out a lot of cash!

While I have sold this vehicle since this review to my neighbor, she has told me she loves this product when she pulls her rv. I now have a 34 ton pick up and purchased a set for it. I am very satisfied with the Enhancers i purchased for it!
Frank R - 06/19/2021


Review from a similar Timbren Aeon Spring System in Vehicle Suspension

My last Tundra had Firestone air bags with separate air lines (also purchased from Etrailer). They worked great but I always had to adjust pressure for loaded vs unloaded and assure the pressures were even.

These are so much better. Stock smooth ride unloaded and I don't have to do a thing when I load the bed or add a trailer behind it. I towed a 24 foot 14K pound equipment trailer with two side by sides and two atv's on it from NE GA to northern TN and had no worries what so ever.
I would highly recommend them!


Review from a similar Timbren Aeon Spring System in Vehicle Suspension

I was very impressed with the easy installation and
the performance of the product.
I can easily put a 1 yard of top soil in my Ram 1500
and my truck carry it level , no problem. No more snag
In the rear. I also find towing a trailer much better. No worries about blowing air bags, this product is maintenance free. Love it, it simple and it works great. Highly recommend

Great product, works well and easy to install
Anthony L - 05/31/2021


Review from a similar Timbren Aeon Spring System in Vehicle Suspension

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.

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


Review from a similar Timbren Aeon Spring System in Vehicle Suspension


We are very pleased with the long term performance, and mechanical characteristics. NOTE: product arrived, out of the box impeccable machining, assembly, and, finish coating.
James - 07/16/2022


Review from a similar Timbren Aeon Spring System in Vehicle Suspension

Fitment for Ram Promaster 3500 Thor Sequence 20k motorhome:
A suspension enhancement that should be installed on every Promaster 3500 camper conversion. Straight from Thor's factory, these campers wallow in wind and when semis blow by; scaring the daylights out of you.
Timbren's upgrade is easy to install and results in about an additional 1/2-3/4" clearance. Improvements in handling are immediately noticeable. Even driving around town. Rounding hard curves on the interstate used to be dreadful. Now I drive into them with confidence.
STILL, handling needs additional help. Helper springs will be my next purchase. Unfortunately, etrailer does not carry Hellwig EZ-990 HELPER SPRING KIT (part #9665) . It's design addresses some of the complaints voiced by buyers of etrailers option.
Additionally, I considered replacing the OEM NEXEN tires with ones with a higher load rating. Thinking they contributed to handling issues. BUT, after installation of Timbren's upgrade; it was clear that is not necessary. Timbren's product is ridiculously priced for what it is. Though the handling improvements alone are well worth it. Perhaps one day these will be stock on all Ram Promasters.

Thank you for your review! While dont carry the part you mentioned, we do carry the SuperSprings Custom Suspension Stabilizer and Sway Control Kit as an alternative. I attached a link to the part.
-- Etrailer Expert Brooke M - 05/11/2021
The Timbren Rear Suspension Upgrade has worked quite well in the year since it was purchased. I also added Hellwiggs helper spring kit and changed tires to Michelin Agilis Cross Climate. One can drive the Ram Promaster 3500 camper fully loaded with complete confidence, now.
Katherine E - 06/23/2022


Review from a similar Timbren Aeon Spring System in Vehicle Suspension

I just installed the Timbren Rear Suspension Enhancement System on my 2019 Ford F-150 4x4. The install was pretty straight forward, but I will say that the written instructions were pretty vague. Reviewing the Video on the e-trailer site was helpful. Also the markings for Left and Right could be improved. The marking “L” was very small and baring readable and the “R” appeared to be under some scratch marks so it was not legible at all. I think this product will help considerably. I have attached photos. The clearance between the rubber spring and the bottom plate is approx 1”. I also previously installed the Equalizer weight distribution & 4 way anti sway system to tow my 30’ Travel Trailer. The Timbren is to prevent any slight squat may occur.

Peter - 02/16/2021


Review from a similar Timbren Aeon Spring System in Vehicle Suspension

It's okay. I believe I'm going to replace it with an air bag system though, as currently every time I hit a bump the springs make the small gap to the top of these and I'm always hitting the bump stops.

You mentioned that when hitting a bump a gap appears above the springs. Would be able to send a picture?
-- Etrailer Expert Jenny N - 05/09/2022
There is always a gap above the springs, they do not contact the leaf spring while the truck is resting. It is just small enough of a gap that any bump I do hit makes the leaf spring contact the Timbren jounce spring, which has the same sound effect as hitting a bump stop.
-- comment by: Christopher - 05/09/2022
My apologies as I was thinking that you meant that there was a gap at the top of the Timbren bump stop verses at the bottom between the bump stop and the springs. Of course, there should be a 0.5 inch to 1.5 inch gap and some people feel like it creates a stiffer ride when the truck is not loaded. I think this is what you are experiencing. I would recommend taking a look at part # AL89388
Air Lift LoadLifter 5000 Ultimate Plus Air Springs w/ Internal Bumpers - Stainless Steel - Rear Axle
for your 2021 GMC Sierra 1500 with 4 WD. There are a few tech tips to consider with this kit. It will not fit with vehicles equipped with Adaptive Ride Control or the AT4 models.
-- Etrailer Expert Jenny N - 05/09/2022

Show More Reviews

See what our Experts say about this Timbren Vehicle Suspension

  • How Does Timbren Suspension Enhancement Weight Capacity Affect Vehicle Weight Capacity
    The weight capacity for the suspension enhancement kits we offer can be confusing in how it's listed but basically the kits provide their capacity in additional suspension support. So it adds that much support to the vehicle's capacity already listed. For example the part # TDR5500 would add an additional 12,000 lbs of suspension support to the vehicle. Now to make things even further confusing (hopefully not) this does not actually give the vehicle more weight carrying capacity. It just...
    view full answer...
  • Recommended Suspension Enhancement For 2016 Ram 5500
    The Vin number doesn't help me find your current capacities, but I have the information needed to help with a solution. We have suspension enhancement systems that work with your current suspension to help with support and reduce sag. Your current payload is between 10,000 lbs and 12,300 lbs. So your current leaf springs are between 5,000 and 6,000 lbs minimum. I recommend the Timbren Rear Suspension Enhancement System # TDR5500 for the rear of your 2016 Ram 5500. This is a confirmed...
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  • Fit and Compatibility of Timbren Rear Suspension Enhancement on a 2015 Ram 5500 Cab and Chassis
    I confirmed with Timbren that the # TDR5500 is indeed the correct suspension enhancement spring for your 2015 Ram 5500 Cab and Chassis. The contents of the kit are designed for the stop over the axle as seen in the attached diagram. This kit includes 2 aeon rubber springs. The # TDR5500 can be installed whether you vehicle was equipped with or without factory top overload springs. What it sounds like you are describing is the upper overload springs. The Torklift # TLA7200 is a good...
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  • Suspension Enhancement for 4-WD 2021 Dynamax Isata 5 Motorhome 28SS Built on Ram 5500 Chassis
    I suggest the Timbren Rear Suspension Enhancement System, # TDR550. These hollow rubber springs sit above the rear axle to help stabilize and level your Dynamax Isata 5 Motorhome. Because they work independently, the side-to-side movement helps to compensate for off-center loads. For the front suspension, I suggest the Timbren Front Suspension Enhancement System, # TUMDF70. These front hollow rubber springs help to stabilize and level your Dynamax Isata 5 Motorhome and provide a more...
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  • Suspension Enhancement for Front and Rear of 2020 Dynamax Isata 5 Super C Motorhome
    For your 2020 Dynamax Isata 5 I recommend using the Timbren Front Suspension Enhancement System # TDF5500. This system will better serve your suspension as the majority of your added weight is over the rear axle. The # TDF5500HD is more designed for your severe service vehicles like tow trucks and vehicles that will have large plows mounted on them. For the rear I recommend the Timbren Rear Suspension Enhancement System # TDR5500. This will offer you more stability at 12,000lbs versus...
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