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Timbren

Timbren Axle-Less Trailer Suspension - Standard Duty - No Drop - 4 Bolt Flange - 3,500 lbs

Part Number: ASR3500S05

131 Reviews | 231 Questions

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$954.89

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timbren trailer axles spindles only universal fit asr3500s05

timbren trailer axles rubber spring suspension standard grade axle-less - duty no drop 4 bolt flange 3 500 lbs

timbren trailer axles standard grade spindles only asr3500s05

timbren trailer axles standard grade universal fit asr3500s05

timbren trailer axles rubber spring suspension universal fit

timbren trailer axles standard grade spindles only

timbren trailer axles rubber spring suspension spindles only axle-less - standard duty no drop 4 bolt flange 3 500 lbs

timbren trailer axles rubber spring suspension spindles only asr3500s05

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0 trailer axles timbren rubber spring suspension spindles only axle-less - standard duty no drop 4 bolt flange 3 500 lbs

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0 trailer axles timbren spindles only universal fit asr3500s05

0 trailer axles timbren rubber spring suspension spindles only asr3500s05

0 trailer axles timbren rubber spring suspension standard grade in use

0 trailer axles timbren rubber spring suspension standard grade axle-less - duty no drop 4 bolt flange 3 500 lbs

0 trailer axles timbren rubber spring suspension universal fit in use

0 trailer axles timbren rubber spring suspension universal fit axle-less - standard duty no drop 4 bolt flange 3 500 lbs

0 trailer axles timbren standard grade spindles only asr3500s05

0 trailer axles timbren standard grade universal fit asr3500s05

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Videos

Complete Breakdown of the Timbren Axle-Less Trailer Suspension w/ Idler Hubs

Timbren Axle-Less Trailer Suspension System Test Course

All About the Timbren Axle-Less Trailer Suspension

Timbren Manufacturer Spotlight - Suspension Enhancement

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SCHEDULE AN INSTALLATION

Get more clearance and a smoother ride when towing with Axle-Less trailer suspension. Built-in shock absorption limits rattle and bottoming out. E-Z Lube, standard-height spindle keeps your deck height the same. Fits any trailer frame width. Great Prices for the best trailer axles from Timbren. Timbren Axle-Less Trailer Suspension - Standard Duty - No Drop - 4 Bolt Flange - 3,500 lbs part number ASR3500S05 can be ordered online at etrailer.com or call 1-800-940-8924 for expert service.

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Timbren Trailer Axles - ASR3500S05

Highlights

3,500 lb Capacity: Supports single- or tandem-axle trailers for dependable load handling.
Axle-Less Design: Removes the cross-beam for more ground clearance and frame flexibility.
Rubber Jounce & Rebound Springs: Absorb road shock for a smoother, quieter ride.
Independent Suspension Arms: Keep bumps on one side from shaking the whole trailer.
E-Z Lube 4-Bolt Spindles: Make bearing service simple with built-in grease zerks.
Standard-Height Spindles: Maintain your deck height while improving clearance below.

Features to know about

Smooth Ride on Every Trip: Rubber Spring Suspension Soaks Up Shock

Rough roads can make towing a chore. The Timbren Axle-Less Trailer Suspension uses AEON heavy-duty rubber jounce and rebound springs that absorb road shock and control trailer roll. They work together to keep your load steady and quiet, even when the trailer is empty or fully loaded. The independent design lets each wheel move on its own, so bumps on one side don’t shake the whole trailer.

More Clearance Without Raising the Deck: Axle-Less Design with Standard-Height Spindles

Traditional axles hang low and cut into ground clearance. This setup gets rid of the axle beam entirely, leaving more room beneath the frame while keeping deck height unchanged. The standard-height E-Z Lube spindles sit 4" below the frame and have built-in grease zerks for easy bearing maintenance. With no crossbeam to drag, the trailer clears steep driveways and rougher paths with ease.

Built to Last: Strong Steel Construction with 3,500 lb Capacity

Each side mounts directly to the trailer frame with a 4-bolt brake flange and carries up to 3,500 lbs total. Heavy steel parts are finished in black powder coat to resist rust and corrosion. The bushings are polyurethane for long-term durability, and the spindles use common #84 bearings—inner L68149 and outer L44649—for easy hub matching down the road.

Simple, Universal Fit: Works with Any Frame Width

Measuring for replacement axles can be tricky. This system eliminates that hassle by bolting straight to your trailer’s frame and fitting any width. If your trailer doesn’t have a crossmember at the mounting point, you can run a 2" x 2" steel tube through the built-in square holes for support. It’s a clean, straightforward way to modernize your suspension without worrying about custom axle sizes.

Crossmember installation example showing steel beam running between Timbren Axle-Less suspension units for trailer frame support

2x2 inch steel tubing installation through Timbren Axle-Less suspension units showing added trailer frame reinforcement

Reinforcement bracket installation on trailer frame connected to Timbren Axle-Less suspension system

Specs

Application

Application: single- and tandem-axle trailers that use regular tires
Tandem-axle trailers: require 2 complete systems
Not recommended for: triple-axle trailers

Quantity

Quantity: 2 suspension units (without hubs)

Weight and Capacity

Weight capacity: 3,500 lbs

Brake Flange

Brake flange configuration: 4 bolt
Bolt hole diameter: 1/2"

Suspension Travel

Suspension travel: 1-3/4"

Warranty

Warranty: 3-Year limited warranty

Tire, Wheel, and Hub Compatibility

Tire size: ST215/75R15 or smaller
Wheel diameter: 15" or smaller
Wheel offset: zero offset

Bearings and Races (sold separately)

Inner bearing: L68149
Outer bearing: L44649
Inner race: L68111
Outer race: L44610

Seal (sold separately)

Seal number: 10-19
Inner diameter: 1.719"
Outer diameter: 2.565"

Dimensions

A: 13"
B: 15"
C: 1"
D: 5"
E: 3-13/16"
F: 4-1/4"
G: 5-5/8"
H: 6"
I: 4-3/4"
J: 1-3/4"
K: 3-3/8"
L: 3-11/16"

Front view technical dimension diagram for Timbren Axle-Less trailer suspension showing labeled measurements A through F

Top view technical dimension diagram for Timbren Axle-Less trailer suspension showing labeled measurements G through L

Note

Crossbeam support required: 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.

Installation measuring diagram showing points A and B for aligning Timbren Axle-Less suspension mounting locations on trailer frame

Technical labeled diagram of Timbren Axle-Less trailer suspension showing jounce spring, rebound spring, control arm, and E-Z Lube spindle components

Jounce spring: Supports the weight of your trailer and cargo. It easily absorbs road shock and is constructed of AEON heavy-duty, hollow rubber.
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.
Trailing arm with integrated hanger: Attaches the suspension to the side and bottom of the trailer frame.
Control arm: Carries the spindle and the hub. It pivots on strong, long-lasting polyurethane bushings that never require lubrication.
E-Z Lube spindle: Simple to grease. If damaged, it can be removed and replaced, saving you both time and money compared to a traditional axle.
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.

ASR3500S05 Axleless Trailer Suspension System by Timbren - Standard Height Spindle - Without Hubs - 3,500 lbs

Installation Details ASR3500S05 Installation instructions

Alternate Instructions ASR3500S05 Installation instructions

4.7

131 reviews

5 Stars		(109)
4 Stars		(12)
3 Stars		(2)
2 Stars		(3)
1 Star		(5)

by: Quintin 01/05/2021 One Year Later

Trailer suspension and disk brake performance is outstanding big big difference over leaf spring and electric drum brakes.
Installation required modifications to the frame to monut the timbren suspension

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Quintin One Year Later

1/6/2022

The Timbren axle less suspension and Disk brake and disk brake controller system is still work great. will never go back to drum brakes or leaf spring axle suspension.

by: Salma 12/23/2020 One Year Later

Timbren saved our RV road trip! The leafs on the axle on our 2018 Jayco TT came apart while driving in Maryland. We tried going to the manufacturer, but they were useless. Going to a RV mechanic meant being grounded for at least 2 months. Then we found Timbren. With the help of Timbren's excellent staff we purchased axle-less system through etrailer, who made sure we got as quick as possible. It came ahead of schedule, my husband installed the Timbren system and we were back on the road! The axle-less system is better than the original manufacturers. If you plan on taking your RV or TT farther than 100 miles GET THIS INSTALLED and get it through etrailer.

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by: Ryan 08/24/2024 One Year Later

Huge improvement over the factory leaf springs. The suspension is so nice and quiet, I forget I’m towing. Very rust proof as well with many dips in saltwater with no signs of oxidation. Not the easiest to install but it’s nice to have the option to either weld or bolt on and replaceable spindles insure the suspension will likely outlast the rest of the trailer.

by: captralph 04/02/2015

Great product.. My company manufactures trailers with our own axle-less suspension, however we have abandoned our own design in favor of the Timbren system. It is far superior and more cost effective to use the Timbren. Also, the Timbren can be adjusted for camber, a nice feature on a trailer. Just be sure to order the correct spindle for your application. Exchanging the spindles with etrailer became a nightmare. I eventually kept the original spindles and bought new ones from Timbren directly.

by: Josh M 08/24/2016 One Year Later

I use these axles on off road trailer built to tackle the toughest 4x4 trails and the have held up to all the beating our customers can dish out

by: Allan 05/14/2021 One Year Later

We don't use our trailer often but when we do, it performs flawlessly. We are so grateful for the function axles. It gives us the desired cushioned ride

by: CS 08/11/2016 One Year Later

Easy to install. Big difference in trailer's suspension and handling. Highly recommended.

by: Mark 06/08/2022 One Year Later

Again nice addition to my trailer

by: Rod 05/02/2023 One Year Later

Easy to install. Tow like a dream!

Rod One Year Later

5/3/2024

Ready to buy another set, and make another trailer.

by: Paul 07/28/2020

Product was great easy to install, haven’t towed with it yet as I’m sill working on the repairs!

by: Rostyslav 04/25/2021

Thank u for your business!

by: Daniel 09/08/2023

by: Ronald 05/16/2023

by: Tyler 05/10/2021

by: Brendon 05/31/2023

by: David 01/13/2022

by: Alan 02/05/2025 One Year Later

Best axle system for overland trailers and their travels, great independence system for those 1-6 trail ratings, simple to work on , easy bolt on system. I would recommend to grease after each trip . The standard Duty -4" Drop- 4Bolt Flange- 3500 lbs give me about 21" clearance with 35" x 12.5 tires

Click to Enlarge

Gwendolyn Y.

2/6/2025

Hey Alan. I love seeing all your progress pics. However, I think my favorite part is the camper art on the back! Do you have a bucket list location you want to take it to?

by: dale 04/21/2021 One Year Later

The trailer rides great down the road and no more worries about saltwater and rusty leaf springs. Not a cheap option but I’m very happy with the setup. When installing, just be sure to measure accurately and have sharp drill bits. A drill press type of guide also helps ensure correct drilling angles. The first picture is of a mounting gusset a local welding shop made. One is needed for each side and necessary to provide needed mounting strength-at least on my trailer frame. Pics 2 and 3 show the mounted suspension on one side of the trailer. Pic 4 shows the suspension on one side of the trailer with the axle attached and a separately purchased disc brake assembly mounted on it. Finally, pic 5 shows a 2” box channel between both suspension assemblies. Independent suspensions would have been nice, but I wanted to ensure trailer rigidity was maintained. So, after one year, so far, so good. It’s all smooth sailing down the highway.

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Dale One Year Later

4/22/2022

Actually over a year, and still working great.

by: Jake 08/21/2023 One Year Later

Installed the Timbren Axle-less suspension a little over a year ago and approximately 5000 miles ago. I have been extremely satisfied with the installation and performance thus far and have had no issues. I also chose to install an optional crossmember for more strength using a 1/4" thick piece of 2x3 steel. I had to increase the weight capacity of my campers suspension due to renovating the interior completely and adding more weight. I also strengthened the frame to accommodate the extra weight. In addition to installing the Timbren 5200LB system I installed new 12" electric brakes and upgraded to 225/75R15 tires with E load range rating.

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Jake One Year Later

8/29/2024

15,000 miles later and zero issues. Very satisfied.

by: Jake 08/18/2023 One Year Later

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by: Jay 05/08/2026

Customer service is amazing! Thanks to all of the team at etrailer.

by: Scott 02/12/2021

Very exicited about these axels, I have been eyeing these for over a year. (Excellent service from etrailer, they had my parts to me in 1 day from the time of placing the order.) These axles seem to be well made and fit nicely with the Dexter hub and drum assembly and the 12" electric brake kit. I installed this all on a M1101/M1102 trailer frame after removing the factory axel assembly. I have not ran these on the road or off as of yet but will give another review at that time. The fit and finish are great and the packaging was good, a little banged up from shipping (missing 1 washer)

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by: Radoslav 06/13/2020

The order came in on time and the customer service at etrailer.com (Ashley) and Sean from Tmbren was outstanding. They both were very helpful in my choosing the right product for my needs. The axle less suspension's performance is absolutely superb. It vastly improves ride quality. I am using it on a teardrop camper that often goes on gravel roads and the raddling sound from the leaf axles was horrible. A couple of points to consider before you settle on the axle less suspension: keep in mind that you will lose some hight of the trailer. While you will gain clearance from the lack of the axle, the suspension will make the trailer sit lower than before.i had to lower my hitch by an inch to maintain the trailer leveled. Also it does appear to compress at higher rate than the leaf springs, which makes it softer but easier to reach it's limit. Overall this product is absolutely a must if you are looking to improve the safety and the quality of your towing.

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by: David 02/13/2026

Hi Amy,,
I got my order yesterday, it is perfect for what for my off road camper trailer project.
Maybe a little (lot!) Over kill, but where it will be going I don't think over kill is a bad thing.

I have made a lot of purchases from you guys and have never been disappointed.

I will probably need to purchase the hub/break assembly next.
Thanks for everything,

by: David 09/28/2022 One Year Later

Actual trailer weight 1540#, 210# tongue weight. 1310# suspension load. After 600 miles, both springs collapsed making the suspension rigid. Have received replacement springs from Timbren but haven't had a chance to try them out.

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Parts Needed to Add Brakes to 2018 Carry-On Trailer
Based on what I have found, the 3K7258 axle is a standard 3,500 lb axle. To add brakes to your Carry-On trailer you will need the following: -Hub and Drum Assemblies: Easy Grease Trailer Hub and Drum Assembly for 3.5K Axles # AKHD-545-35-EZ-K -Brake Assemblies: Electric Trailer Brake Kit - Self-Adjusting # AKEBRK-35-SA -7-Way Wiring: Hopkins 7-Way Molded Trailer Wire Connector # HM20048 (If you want a junction box use # 3375601101) -Breakaway Kit: Hopkins Engager Push-To-Test Trailer...
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Recommended Timbren Axle-Less Suspension To Replace 3500lb Axle On 2019 Forest River R-Pod 179
The Timbren Axle-Less systems are all universal, and since they bolt directly to the frame of the trailer can be used on any trailer including your 2019 Forest River R-Pod 179. Based on the information I can find on your R-Pod it appears that you are correct in thinking the OEM is a 3500lb axle. For a 3500lb replacement I recommend the Timbren Axle-Less Trailer Suspension System - 3,500 lbs # ASR3500S05. This will allow you to reuse your current braking assemblies as it has the standard...
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Recommended Tire Size Compatible with Timbren HD 3500-lbs Axle-less Suspension System
I'll start off by saying that wheels and tires do not come with hubs, and what hubs you'll be able to use depend on the spindles on the axles, and whether or not you'll want brakes on the trailer or not. If you're going to be using the Timbren # TASR35HDS07, you'll need hubs that have # 25580 inner bearing and # 15123 outer bearings, like the # AKHD-655-6-EZ-K for a hub and drum assembly or # AKIHUB-655-6-EZ-K for idler hubs. If you're going with the hub and drum so you can add brakes,...
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Solution for Replacement Axle on 2004 Marine Master Boat Trailer
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How to Find Replacement Hub for Mobile Home Axle
In order to find a replacement hub for your axle you will need to know the current bolt pattern, as well as the bearings and axle capacity. For example, the Trailer Idler Hub Assembly # 84655UC1 you looked at has a 6 on 5-1/2 bolt pattern and is for a 3,500 lb axle. It uses a # L68149 inner and # L44649 outer bearing. To find out which bearings fit your spindle you will need to remove your current hubs. You can look for part numbers on your existing bearings or measure using a digital...
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What Is Included With These Trailer Brake, Spindle, Hub, and Timbren Suspension Parts?
Hello Sergio, Thanks for writing in. 1. # DMSB18794M-93M – Demco Hydraulic Trailer Brakes, 10", 3.5K This kit includes one left-hand/driver-side complete hydraulic brake assembly and one right-hand/passenger-side complete hydraulic brake assembly. Each is a complete duo-servo assembly with the galvanized backing plate, brake shoes and pads, zinc-plated wheel cylinder, stainless steel springs and adjuster components. The adjuster plugs are also included. The mounting bolts, washers,...
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Solution for Replacement Axle on 2006 Ranger Boat Trailer
Hey Keith, welcome back! I do have a solution, but I'm sorry to say we don't carry torsion axles like the one on your 2006 Ranger boat trailer. What I can offer is a universal option like the Timbren Axle-Less Trailer Suspension # ASR3500S05. The Timbren fits any trailer width, and uses AEON rubber springs which act like a torsion axle. This particular model has a 3,500 lb capacity. I'm not sure what the rest of the specs are on your trailer but this would be a capacity reduction by 250...
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Replacement Axle Spindle for Dexter P21-SLR with 76 Inch Spring Seats and 44649 and 68149 Bearings
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Does etrailer Carry 3,500 lb Torsion Axles
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Is There An Axle With 89" Hub Face Measurement And 70" Spring Center Measurement?
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Are There 72 Inch 3,500 lb Axles
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How Far Does the Dexter Hub # 84556UC3 Center Bore Extend From the Mounting Face of Hub?
I went out to the warehouse to measure the Trailer Hub and Drum Assembly - 3,500-lb Axles - 5 on 5 # 84556UC3 and the center bore will stick out 1-3/4 inches from the hub face and the dust cap will add 7/8 inch. These hubs will work well on the Dexter Trailer Axle Beam with EZ-Lube Spindles - 89" Long - 3,500 lbs # T3584F-EZ-8974. For your brake assemblies, I recommend the Electric Trailer Brake Kit - Self-Adjusting - 10" - Left and Right Hand Assemblies - 3,500 lbs # AKEBRK-35-SA if...
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Axle Replacement for TDE 46024 Axles
Hey Rich, thanks for reaching out and providing a photo of your axle tag! According to the info on your tag you'll need a 3,500 lb axle with a hub face length of 89.38" and spring center length of 77.25". We don't have any axles with those specs so for your application we'll have to get you set up with a Timbren Axle-Less Trailer Suspension, which comes in the following configurations for a 3,500 lb axle: - Spindle Only # ASR3500S05 - Idler Hub # A35RS545 - Hub/Drum with brakes # A35RS545E If...
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Recommended Axle-Less System for a 2016 Forest River R-Pod 179
Stephen, from what I can gather your Forest River R-Pod 179 has 3,500 lb axles, so the Timbren Axle-Less Trailer Suspension # ASR3500S05 would be the correct one. This would also allow you to reuse your braking assemblies because it'll use the same bearing combination your current axle uses.
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What Timbren Axle-Less Set Up Do I Need for my 2024 Nucamp Tab 320s Boondock
Hey, Michael. Thanks for all the information. I was able to reach out to Dexter with the information you gave me and get all the specs I need to find the right Timbren kit for you. If you're wanting a straight spindle, then kit part # ASR3500S05 is exactly what you need. This would pretty much be an equal swap out so to say. However, Timbren also offers their kits with a 4" lift. If that's something of interested, especially if you want more ground clearance, then get part # ASR3500S06...
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Upgrading Axle for 5 on 5 Hub for Carry-On 5X8G Trailer
Hey Ben, welcome back! Are you trying to match the bolt pattern for vehicle wheels? We do carry 5 on 5 hubs like # AKHD-550-35-EZ-K (hub and drum) or # AKIHUB-550-35-EZ-K (idler hub). However, these fit your standard 3,500 lb axle spindle with # L68149 inner and # L44649 outer bearings. An axle like the # e78GR matches your measurements but it is a 2k axle so it won't work with the hubs. I have two possible options for your. The first is to contact a company like Dexter and have them make...
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How To Use 5 on 5 Wheels with the Timbren Heavy-Duty Axle-Less Trailer Suspension
The only Timbren Heavy-Duty Axle-Less Trailer Suspension which allows you to obtain hubs/drums with a 5 on 5" bolt pattern is part # ASR3500S05 which is rated for 3,500 lbs. In order to obtain this bolt pattern with brakes you'll need the Easy Grease Trailer Hub and Drum Assembly part # AKHD-550-35-EZ-K and Electric Trailer Brake Kit part # AKEBRK-35-SA. The max wheel size for this hub/drum we can safely recommend is 15" due to the surface area on the hub.
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Solution for Replacement Hubs on Old Trailer With Timken BB-1201 and BB-12-15 Bearings
Hello Derek; there are no trailer hubs that will fit that bearing combination. Unfortunately, you're looking at replacing the axle if you want new hubs. You're going to have to find the axle capacity and hub face length to get the right replacement. You could also replace the axle with a universal system like the Timbren Axle-Less Trailer Suspension # ASR3500S05 which fits any frame width so you only need to know the capacity.
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Best Trailer Axles To Use For A Spring Center To Spring Center Measurement Of 74"
I do have trailer axles similar to what you are looking for in our Timbren Axle-Less Suspension Systems however, we do not offer torsion axles at this time. In order to recommend a proper replacement axle for your setup, I would need to know the weight capacity of the axle you are seeking. For a Timbren Axle-Less Suspension System, you would use part # ASR2000S02 for 2,000 lb. axles, part # ASR3500S05 for 3,500 lb. axles, or part # ASR5200S01 for 5,200 lb. axles. I have attached a review...
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