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  1. Trailer Axles
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  5. Spindles Only
  6. Drop - 4 Inch
Timbren Axle-Less Trailer Suspension - Standard Duty - 4" Drop - 4 Bolt Flange - 3,500 lbs
Timbren

Timbren Axle-Less Trailer Suspension - Standard Duty - 4" Drop - 4 Bolt Flange - 3,500 lbs

Part Number: ASR3500S04
$976.86
Trailer Axles
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Get more ground clearance and a smoother ride when towing with Axle-Less trailer suspension. Built-in shock absorption limits rattle and bottoming out. E-Z Lube, 4" drop spindle lowers deck height for easy loading. Fits any trailer frame width. Great Prices for the best trailer axles from Timbren. Timbren Axle-Less Trailer Suspension - Standard Duty - 4" Drop - 4 Bolt Flange - 3,500 lbs part number ASR3500S04 can be ordered online at etrailer.com or call 1-800-940-8924 for expert service.
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Timbren Trailer Axles - ASR3500S04

  • 3500 lbs
  • Universal Fit
  • Spindles Only
  • Drop - 4 Inch
  • No Hubs
  • Rubber Spring Suspension
  • Standard Grade
  • Timbren

Get more ground clearance and a smoother ride when towing with Axle-Less trailer suspension. Built-in shock absorption limits rattle and bottoming out. E-Z Lube, 4" drop spindle lowers deck height for easy loading. Fits any trailer frame width.


Features:

  • Delivers a smooth, stable, quiet ride - regardless of load size
    • Jounce springs absorb road shock and support trailer's load
    • Rebound springs minimize body roll, rattle, and bottoming out
    • Built-in camber and toe-in reduce wear on your trailer's tires
    • Units work independently - what affects one side of your trailer won't affect the other
  • Eliminates axle beam to increase ground clearance and fit any trailer frame width
    • System replaces 1 trailer axle and suspension components
    • 2 Separate units bolt directly to your trailer's frame
  • Designed for your on-road adventures
    • Strong steel construction is built to last
    • Black powder coat resists rust and corrosion
  • Lowers trailer deck height for easier loading and unloading
    • 4" Drop spindle is built in
  • Allows for simple bearing maintenance with built-in grease zerks


Specs:

  • Application: single- and tandem-axle trailers that use regular tires
    • Tandem-axle trailers require 2 complete systems
    • Not recommended for triple-axle trailers
  • Quantity: 2 suspension units (without hubs)
  • Weight capacity: 3,500 lbs
  • Brake flange configuration: 4 bolt
  • Bolt hole diameter: 1/2"
  • Suspension travel: 1-3/4"
  • 3-Year limited warranty


Tire, Wheel, and Hub Compatibility

  • Tire size: ST215/75R15 or smaller
  • Wheel diameter: 15" or smaller
    • This assumes a wheel with zero offset
  • Bearings (sold separately)
    • Inner: L68149
    • Outer: L44649
  • Races (sold separately)
    • Inner: L68111
    • Outer: L44610
  • Seal: 10-19 (sold separately)
    • Inner diameter: 1.719"
    • Outer diameter: 2.565"

Note: This Axle-Less system requires crossbeam support. If your trailer frame doesn't have a crossmember in place, you can retrofit it with one, or you can add a support by running a piece of 2" x 2" steel tubing through the square holes cut into these units. You could also add a steel reinforcement bracket to the inside of the trailer frame.


Get more ground clearance and a more comfortable ride when you're towing with Timbren's Axle-Less trailer suspension. This suspension system provides great shock absorption to comfortably get you where you need to go and to protect your precious cargo as you travel - even on rough pavement. With 2 independently operating units, you'll get better handling when making tight turns. And because this system eliminates your axle and has drop spindles built in, you'll get a lower deck height without sacrificing clearance.


Timbren Axle-Less Suspension vs. Other Suspension Systems

There are many suspension options for your trailer or camper. So, what makes Timbren Axle-Less different?


Leaf Spring Example

Axle-Less systems are a definitive upgrade over traditional leaf springs, in part because they allow you to do away with your thru-axle, allowing for maximum clearance. As you've probably noticed, having a leaf spring suspension means that your axle will always hang at least a few inches below your trailer's frame, resulting in limited ground clearance and a high deck height. This may make it difficult to navigate rough roads and to load items into your trailer.


In addition, while leaf springs do a great job of supporting an even load, they may cause your trailer to bounce and rattle when it's empty or to bottom out with a heavy load. And they don't offer any type of shock absorption for a smooth ride - unless you have upgrades built in. With Timbren's Axle-Less system, gone are the days of dealing with these annoyances - this suspension is designed for a quiet, balanced ride, whether your trailer's fully loaded or empty.


Torsion Axle Example

A torsion axle is a step up in terms of shock absorption, and it provides more clearance than a traditional, leaf spring suspension, but that crossbeam will still hang down some. And if your torsion axle gets damaged in any way, it can't be repaired - you'll have to replace the entire thing with a setup that matches your exact trailer frame width.


With the Axle-Less system from Timbren, you won't have a low-hanging axle beam to get in the way when you're driving on rough roads. The drop spindles on this setup will also lower your deck height, making loading and unloading your trailer way easier. And the rubber springs and independent operation both combine to absorb shock and deliver a smooth, easy ride. In addition, the Axle-Less system can be easily maintained over time, and it will fit any trailer frame width, so you don't have to worry about potentially ordering the wrong size like you might with other systems.


Timbren Silent Ride Example

Another suspension upgrade on the market is Timbren's Silent Ride. This setup is a great option to reduce bounce and rattle because it has the same AEON rubber springs as the Axle-Less system. But the Silent Ride still requires an axle, so you won't get the same ground clearance or low deck height as you will with the Axle-Less suspension.


Timbren Axle-Less Suspension Parts

The Timbren Axle-Less suspension is designed with you in mind. All of the parts work together so you can tow your trailer comfortably - regardless of load size.


Timbren Axle-Less Suspension Parts Diagram

  1. The jounce spring supports the weight of your trailer and cargo. It easily absorbs road shock and is constructed of AEON heavy-duty, hollow rubber.
  2. The rebound spring delivers a smooth, stable ride - regardless of how much cargo is on the trailer. It controls the movement of the jounce spring to minimize trailer body roll, bounce, rattle, and bottoming out.
  3. The trailing arm with integrated hanger attaches the suspension to the side and bottom of the trailer frame.
  4. The control arm carries the spindle and the hub. It pivots on strong, long-lasting polyurethane bushings that never require lubrication.
  5. The E-Z Lube, 4" drop spindle is simple to grease. If damaged, it can be removed and replaced, saving you both time and money compared to a traditional axle.
  6. The built-in hole accepts 2" x 2" steel tubing (not included) to add support to your trailer's frame. The tubing sits higher than a trailer axle, providing additional ground clearance.

Installing the Timbren Axle-Less Suspension

Measuring Diagram

The first step in installing the Timbren Axle-Less suspension is to make sure that the mounting points for each unit are directly across from each other. The easiest way to measure this is to mark the desired mounting points on your trailer's frame. Then measure the distance between these points and the center of your trailer coupler. These measurements (A and B) need to be within 1/8" to keep your trailer frame square.


Once you have your mounting points lined up, you'll be ready to install the system. Drill 3 holes into your trailer frame at the desired mounting points. Then bolt each unit to the frame with Grade 8, 1/2" bolts (not included).


Keep Your Trailer Frame Square

Because Timbren's Axle-Less system eliminates your trailer's thru-axle, you'll have to find another way to get the crossbeam support that keeps your trailer frame square. You have a few different options to do this depending on your application and how much fabricating you're comfortable doing.


Crossmember Installation

If you're building a trailer, the best option is to begin building with the Timbren Axle-Less in mind and include a crossmember where you want to install the units on your frame. You can also retrofit an existing trailer with a crossmember.


Steel Tubing Installation

If you don't have a crossmember where you want to install the Axle-Less system (and you don't want to add one), pick up a section of 2" x 2" steel tubing from a nearby weld shop. This tubing will serve as a support to keep your trailer square. It will hang only about an inch down from your trailer frame, providing more clearance than a thru-axle.


After you've mounted both of the units to your frame, you'll need to drill 3 holes into the steel tubing and into the built-in, square holes. Then, insert the tubing through the holes and secure it with 3 bolts (not included) on each side.


Reinforcement Bracket Installation

The last option is to fabricate a reinforcement bracket that can be attached to the inside of your trailer frame and to the Axle-Less suspension. It may be a little harder to fabricate a compatible bracket than to mount steel tubing, but you may get additional clearance with this method.


Dimensions of the Timbren Axle-Less Suspension

The following diagrams show measurements taken on the Timbren Axle-Less suspension system.

Axle-Less dimensions front view

A B C D E F
13" 16-3/8" 1" 5" 0" 4-1/4"


Axle-Less dimensions top view

G H I J K L
5-5/8" 6" 4-3/4" 1-3/4" 3-3/8" 3-11/16"




ASR3500S04 Axleless Trailer Suspension System by Timbren - 4" Drop Spindle - Without Hubs - 3,500 lbs

Installation Details ASR3500S04 Installation instructionsAlternate Instructions ASR3500S04 Installation instructions



Ratings & Reviews

4.7

125 reviews
Get more ground clearance and a smoother ride when towing with Axle-Less trailer suspension. Built-in shock absorption limits rattle and bottoming out. E-Z Lube, 4" drop spindle lowers deck height for easy loading. Fits any trailer frame width.

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This is my second Timbren independent suspension. Definitely the best ride on the road.



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Show More Reviews

See what our Experts say about this Timbren Trailer Axles

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  • Can a Leaf Spring Axle be Replaced by a Timbren Axle-Less System?
    Yes, you can replace a leaf-spring axle with a torsion axle on trailers. I would give you a recommendation but unfortunately we do not carry torsion axles. Just be sure you replace your current axle with one that has the same weight capacity.
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  • How to Add Hydraulic Brakes to a 3,500 lbs Timbren Axle-Less System w/ a 5 on 4-1/2 Lug Pattern
    Hey Adam! You can do what you're wanting but not with two of the Timbren Axle-Less Trailer Suspension item # A35RD545E you referenced. You'll need different hubs those won't work with hydraulic brakes. I have listed below all of the parts you will need to use a Timbren system with a surge brake actuator with free backing drum brakes: 2 - Timbren Axle-Less Trailer Suspension item # ASR3500S04 4 - Dexter Trailer Hub & Drum Assembly for 3,500-lb Axles item # 84546UC3-EZ 2 - Dexter Free-Backing...
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  • Determining if Installing Timbren Axle-Less System Will Change Trailer Ride Height
    The Timbren Axle-Less Systems come in a variety of different spindle designs that may allow you to increase, decrease, or simply maintain your trailer's current ride height. The Timbren 3,500 Pound # ASR3500S04 that you were looking at features 4 inch drop spindles which would lower the ground clearance on the trailer. It's hard to say how much this would differ from your current setup since it depends on exactly what kind of torsion axles you have, but I can tell you that this system...
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  • Are Long Spindles Needed For Disc Brakes on Timbren 3,500 lb Axle-Less & Where is Lift/Drop Measured
    Hi Lee, Really good questions, and let's start with the query about long spindles, and the answer is no, you do not need to have the system with long spindles to use disc brakes. Then for the rise or drop, that measurement is taken from the bottom of the frame to the center of the spindle. I'm not sure if you're looking for a drop, rise or just standard so I'll go ahead and list out the options for the 3,500 lb Timbren systems: - 4" Lift: Timbren Axle-Less Trailer Suspension # ASR3500S06 -...
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  • Availability of 3,500 lb Axle With 84" Hub Face Measurement
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  • Timbren 2,000LB & 3,500LB Axle-Less Suspension Systems With #84 Spindle and 4 Bolt Brake Flanges
    Here is a list of the Timbren Axle-Less Trailer Suspensions which have the #84 size spindle with a 4 bolt brake flange. 3,500LB Systems -No Drop # ASR3500S05 -4" Lift # ASR3500S06 -4" Drop # ASR3500S04 2,000LB Systems -No Drop # ASR2KHDS01 -4" Lift # ASR2KHDS04 -4" Drop # ASR2KHDS05 -No Drop, Long Spindle # ASR2KHDS02 -4" Lift, Long Spindle # ASR2KHDS03 -4" Drop, Long Spindle # ASR2KHDS09 Please let me know if you need any help selecting the brakes or hubs needed for these.
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    I attached a picture that shows all of the dimensions of the Timbren Axle-Less Suspension System, # ASR3500S05 that you are interested in. Since I don't know much about your setup the best recommendation I can make would be for you to check out the dimensions I attached and if you decide you do need a 4 inch drop you would want the part # ASR3500S04 instead.
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