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Timbren Silent Ride Suspension for Tandem Axle Trailers w/ 2" Square Axles - 4,000 lbs
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Timbren

Timbren Silent Ride Suspension for Tandem Axle Trailers w/ 2" Square Axles - 4,000 lbs

Part Number: TSR4000T05
$1,033.66
Retail:$1,148.51
You Save: $114.85
Trailer Suspension Parts
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Trailer suspension system replaces your leaf spring suspension to provide a stable ride. Walking beams keep weight distributed evenly between both axles. Pivoting arms help keep your trailer level on rough ground. Rubber springs absorb road shock. Great Prices for the best trailer suspension parts from Timbren. Timbren Silent Ride Suspension for Tandem Axle Trailers w/ 2" Square Axles - 4,000 lbs part number TSR4000T05 can be ordered online at etrailer.com or call 1-800-940-8924 for expert service.
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Timbren Trailer Suspension Parts - TSR4000T05

Highlights

  • Carries up to 4,000 lbs: Handles tandem-axle trailers that need reliable load support.
  • Replaces Leaf Springs: Upgrades to a smooth, quiet suspension that cuts bounce and rattle.
  • Aeon Rubber Springs: Absorb shock and stiffen as weight increases for a steady ride.
  • Walking Beam Design: Shares weight evenly between axles to stay level on rough ground.
  • 4-1/16" Ride Height (uncompressed): Maintains proper frame-to-axle spacing for clearance.
  • 2" Square Axle Fit: Works with standard-size tubes using a required 2"x4" steel crossmember.

Features to know about

Smooth Ride on Rough Roads: Rubber Springs Absorb Shock

Leaf springs can make a trailer bounce and rattle on rough roads. The Timbren Silent Ride Suspension replaces them with double Aeon rubber springs that absorb road shock and support up to 4,000 lbs. These progressive-rate springs compress and stiffen as load increases, keeping the trailer steady whether it’s empty or fully loaded. The rubber also acts as a return device to minimize rattle and bottoming out so the suspension stays quiet and controlled.

Even Weight Distribution Across Both Axles: Walking Beam Stability

When one axle hits a bump, weight shifts fast. The Silent Ride’s walking beams with single pivot points keep the load evenly balanced between both axles. This equalizing design gives smoother transitions over uneven ground and reduces the harsh jolts that can wear out tires and parts. It helps all tires stay in contact with the road for better traction and stability.

Stays Level on Uneven Terrain: Pivoting Arms Keep Balance

On unlevel ground, pivoting suspension arms help the trailer stay level instead of leaning or swaying. Each side works independently to absorb movement, keeping the load balanced even if it’s off-center. The fitted rubber bushings keep the control arms fully engaged so the springs are always working, giving a consistent, stable feel no matter the surface.

Built to Last and Easy to Maintain: Heavy-Duty Steel with Powder Coat Finish

The Silent Ride system is constructed from heavy-duty steel with a durable, rust-resistant powder coat finish. It’s virtually maintenance-free once installed, designed to handle years of use without the constant upkeep leaf springs require. The rubber bushings and springs carry a 10-year warranty, and the suspension units themselves have a 5-year limited warranty for long-term confidence.

Straightforward Installation for Custom Builds: Bolt- or Weld-On Setup

This system bolts or welds onto tandem-axle trailers with 2" square axles. Installation requires a 2" x 4" hollow steel crossmember with a wall thickness of either 1/8" or 3/16" (not included). Bolt-on installation uses Grade-5, 5/8" bolts (not included). Once mounted, the setup delivers a 4-1/16" height from the axle beam center to the frame, keeping the suspension geometry consistent and ready for the road.

Specs

Application

  • Application: tandem-axle trailers with 2" wide axles

Technical diagram of the Timbren Silent Ride Suspension system for tandem axle trailers showing the steel frame, pivoting arms, and Aeon rubber springs for 2-inch square axles, used to illustrate installation and component layout.

Weight and Capacity

  • Weight capacity: 4,000 lbs

Quantity

  • Quantity: 2 suspension units

Warranty

  • Warranty: 5-Year limited warranty
  • Rubber bushings and rubber springs warranty: 10-Year

SR4000T05 Timbren Trailer Suspension - 2" Square Tandem Axle - 4K

Installation Details TSR4000T05 Installation instructions



Video of Timbren Silent Ride Suspension for Tandem Axle Trailers w/ 2" Square Axles - 4,000 lbs
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Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.




Video Transcript for Timbren Silent Ride Suspension Review

Today we're going to be taking a look at the Timbren line of silent ride suspension systems. Now, these systems have been designed to work for trailers with capacities anywhere from 2000 pounds all the way up to 14,000.Now, the silent ride system from Timbren is really one of the best upgrades you can make to a trailer suspension. This is going to give you excellent handling out of your trailer. You're not going to have so much of the side-to-side. You're also going to feel it less as you haul it.As our suspension system works here up and down, whether you're got your trailer loaded to capacity or empty, you will hear any feel a noticeable difference in the ride quality on your trailer. Now, I really appreciate that, because we haul a lot of trailers around here, and it's just aggravating, always hearing that noise, and always hearing that rattle behind you.

This has almost completely eliminated it on this trailer.This is also going to be very important when it comes to car haulers. You've got cars in here, sometimes race cars, expensive cars. You don't want them being beat up, your tools that are in there. You don't want them shaking around a whole lot. This is also going to work out really well for our camper trailers.

We've got dishes, we've got stuff in there that's important. We've got our tools stored in there. We just don't want them getting beat up.Installing a suspension system like this is really going to smooth all of that out for you.Now, the setup we have here today is the single axle configuration. You can see, we've got or 2x2 cross tube here, our axle here. This is also going to be available in a tandem axle configuration.

This body here becomes a little bit longer, we're going to have one of these off the back, we're going to have one of them off the front. Basically, you're going to have the same cross tube, but it's going to be 2x4, and it sits between them. Right up flush against here and the other side. All in all, it's going to give us a really good solution.Basically, the way this system works, we're going to mount the upper bracket to our trailer. We've got our lower arm here, that's free floating.

We've got an Aeon rubber spring here, and also here. This one is constantly trying to expand out slightly, and it's applying upward pressure on our arm. This one's applying downward pressure on our arm. As we hit a bump, of course, this is going to go up, as this goes up, this is going to expand. This one wants to pull it back, wants it get it back to its normal configuration. This one pushing out wants to get it to its normal configuration.If we think about a regular leaf spring style suspension, it's just sitting there in the middle. It's just going to wiggle when we hit bumps and stuff like that. Where, this is fighting to remain nice and steady and calm, over all those different bumps.Now, let's take a look at our conventional leaf spring suspension, versus our Timbren suspension. As you can see, there's a lot less movement, the trailer doesn't bounce up nearly as much, so it's generating a lot less noise. Overall, it's going to offer a much smoother and more controlled ride.Now, let's take a look at just the silent ride system, as we go through our test course. You can see as we're hitting the different bumps, you're not seeing as much movement as what we're used to with a conventional suspension system. It recovers very quickly. Now as we're just doing some maneuvering around our parking lot, you can see there's no trailer roll side to side. With them working independently, it helps kept everything level.These are also going to offer a variable spring rate. If we load our trailer with a light load, these are going to be compressed slightly, and that's all the effort they're going to have to put out, so it's not going to stiffen up our ride tremendously. As our load gets heavier and heavier, these compress more and more, they're going to get stiffer and stiffer, so they're almost going to adjust for the load that you put on, to maximize your ride quality.Now, the brackets we have here, of course, these are going to be heavy duty steel construction. They've got the black finish on it, help resist any kind of corrosion or issues like that for a long time to come.Now, on your tandem setup, there's a huge advantage in how the Timbren system equalizes the weight equally across your axles. With this single setup, we're going to have our upper bracket, we're going to have our base arm. With the tandem setup, we're still going to have our upper bracket, we're still going to have our base arm, but there's a walking leg that goes in between those. It's going to have a single pivot point right here in the middle, so as the tire gets pushed up in the back, it forces that front tire down. As the tire in the front gets pushed up, it forces that rear tire town. It maintains equal load across both axles at all times. That's something we don't see in leaf spring suspensions, even with equalizers installed. They just don't transfer that properly.Now, one thing to keep in mind when installing this system is that we need to reuse your existing axle. Where it meets the silent ride here, they provide us with this axle seat, so essentially, you're going to remove your old axle, you're going to grind those spring seats off of it to get it nice and flat. Get everything pre-assembled, place it up here, and you'll lay that weld across the back.Now, once we've decided where we're going to be positioning the silent ride, I've marked my holes in center punch. You can see here. You can leave the silent ride clamped into position, as if when you we're setting it up, and use those holes as the guide, if you want to do it that way, that's going to be completely up to you. What we need to wind up with a 5/8th inch diameter hole, we're going to use a step bit. We're going to 3/16ths, go up to a 3/8th, just slowly work up to that 5/8th. Generally, that's the easiest way to drill through this steel.We're going to get both our holes drilled out on this side, and do the same thing on the other side. Now that we got our holes drilled, we're going to take our hardware, get it put in place, we're using 5/8th diameter bolts, you want to use at least grade five, these happen to be grade eight. On to backside, we're going to put a flat washer on. Put a lock washer on. Also, our nut. Now we can snug out hardware down, ours takes a 15/16th, as long as yours is standard 5/8th, it should be the same. All right, now we'll torque those down to the specifications, which are listed in the instructions.Now, we've got our axle up in position. We've got our perches, our spring perches here on the bottom. Now, we had our welder take care of this, we had it all mocked up. We had him pre-weld this, although in your application, you're just going to have to out a bead across this side, and right up here. In the instructions, they tell you just to weld this up after you've got everything bolted up, so you might want to do it that way. It's going to be up to you.We just want to make sure we get our axle centered. You measure from your brake flange here, out to here, or to the center of your trailer, whatever you want to do. You want to make sure that's equal on both sides. Now, we've brought our U bolts down and around. You can see here, each one of those gets a washer, and a nut, and we're going to use a crisscross pattern, get those snugged down, and then we're going to torque them per the instructions.Now, here we've installed our crossmember. This needs to be a 2x2 inch squared piece of tubing. You can see it's 3/16th of an inch thickness. We want it 2x2, 3/16th inch wall. We've got our holes, we got one here, one here that we need to drill. Now, those are going to go in, all the way through, and then they need to come out that upper bracket. I'm going to mark my bottom here. Just using a center punch.Now, for our upper hole location here, it's going to be really tough to get anything in there to mark it. I'm just going to use a right angle pick. I'm going to go all the way around that elongated hole. Then we can just mark the center of that.All right, now we're ready to drill them out. These need to go to a half inch in diameter. We're going to use this step bit process, just like we did on our trailer. Gradually enlarging it.Then once we have the four drilled out here on this side, we're going to flip it over, and use our marks to drill our holes on this side.Now we've got our crossmember put back in place, we're just lining up those holes. We want to take our bolt. We want to pass it up through. On the top, we're going to be using a nylon locknut. Now, depending on your application, this might be a pretty tight fit in here. You could also use a flat washer, a lock washer and a nut, if you have space. It seems like for us, this nylon locknut's really the best solution. We're going to put one in each hole, so two on this side. We've already got the two on the other side. Now we'll get them tightened down.Most of your half inch bolts, you're going to need a 19mm or 3/4, unless you're using something odd sized. Now, we'll want to get these torqued down. Now, once we've got all that torqued down to specifications, we've gone through everything, make sure everything's nice and secure, it's time to just basically rebuild our axles.That's going to complete our look at the Timbren line of silent ride suspension systems.

Ratings & Reviews

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by:
The silent ride appears to be well built. Haven’t used it yet but installation was easy. Although it came with no instructions.I did however see on a Timbren thread it said to cut the center stiffner 10 1/2 inches shorter then width of trailer . I did not do that as I waited got everything installed and took the measurement. Actually you need to cut it 9 1/4 inch’s shorter and that worked perfectly.you will have to loosen everything to get stiffening beam in but I say it’s time well spent.
by:
Easy to install product is working well for my application
by:
Placed these on my 24’ center console trailer. There was an immediate improvement in ride quality. I make several long hauls each year and want suspension parts I can count on. I believe this will be my first suspension that is reliable!
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See what our Experts say about this Timbren Trailer Suspension Parts

  • Can Two of the Timbren Silent Ride Suspension for Single Axle Trailers Be Used Together
    Yes, the Timbren Silent Ride Suspension for Single Axle Trailers part # TSR3500S05 can be used in tandem as confirmed by Timbren. It sounds like you are already aware of the Timbren Silent Ride Suspension for Tandem Axle Trailers part # TSR4000T05 but need more clearance so if that is the case then the above will work just fine for you. In regards to weight capacity, this will not be limited so (3,500 lbs x 2) as confirmed by Timbren.
    view full answer...
  • Suspension Replacement for Tandem Axle Boat Trailer
    Lippert does offer an air-ride option, part # LC1565391, but they do not recommend it for boat trailers because it's not considered submersible. If you're looking to improve the ride quality of your existing trailer, the Timbren Silent Ride # TSR4000T05 system you'd looked at is compatible with 2 inch square axle tubes, but it is not an air-ride system that would allow you to deflate it for more overhead clearance when entering or leaving your garage. When uncompressed, the system will...
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  • Recommended Suspension For Adding a 2nd Axle To 12 Foot Coleman Tent Trailer
    You will need to use a tandem axle setup since installing a Timbren Axle-Less Trailer Suspension # A12RS440 will not allow the suspensions to work together. We have the Timbren Silent Ride Suspension which will allow you to use your current axle and add a 2nd axle. There are several kits available for different axle sizes which I have listed below for you to determine the best option for your Coleman trailer. All the kits are rated with a 4,000lb suspension so you will be able to eliminate...
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  • Timbren Silent Ride Suspension For 2 Square Axles
    I do have an option for you but the Timbren Silent Ride Suspension for Tandem Axle Trailers w/ 3" Round Axles part # TSR7000T05 only fit 3" diameter round axles. The Timbren Silent Ride Suspension for Tandem Axle Trailers w/ 2" Square Axles part # TSR4000T05 is the option for 2" square tandem axles. Timbren currently does not manufacturer a galvanized option but the steel is powder coated for rust resistance so you have nothing to worry about there.
    view full answer...

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Info for this part was:

Employee Mike L
Expert Research:
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Employee Lindsey S
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