bing tracking image
  1. Anti-Sway Bars
  2. Roadmaster
  3. Anti-Sway Bar
  4. Rear
  5. 1-3/8 Inch Diameter
  6. Steel w Polyurethane Bushing
Roadmaster Rear Anti-Sway Bar - 1-3/8" Diameter

Roadmaster Rear Anti-Sway Bar - 1-3/8" Diameter

Item # RM-1139-173
Retail:$555.09
Our Price: $469.60
You Save: $85.49
Anti-Sway Bars

Will this fit?

To see if this custom-fit item will work for you please tell us what vehicle you'll use it with.

Shipping Weight: 40 lbs
Add to cart
In Stock
zoom in icon
slider vertical icon
zoom out icon
Comment field cannot be left empty.
Name field cannot be left empty.

Thank you! Your comment has been submitted successfully. You should be able to view your question/comment here within a few days.

Error submitting comment. Please try again momentarily.

Product Images

In Use/Installed

Customer Photos

Need help with installation?
Locate installers near me
Minimize sway and driver fatigue by improving the stability and driveability of your vehicle. The bar on this sturdy, effective anti-sway system mounts to the rear axle and to the frame to balance weight transfer and reduce body roll. 1-800-940-8924 to order Roadmaster anti-sway bars part number RM-1139-173 or order online at etrailer.com. Free expert support on all Roadmaster products. Great prices and Fastest Shipping for Roadmaster Rear Anti-Sway Bar - 1-3/8" Diameter. Anti-Sway Bars reviews from real customers.
  • All Info
  • Reviews (1769)
  • Q & A (0)
  • Photos

Roadmaster Anti-Sway Bars - RM-1139-173

  • Anti-Sway Bar
  • Roadmaster
  • Rear
  • 1-3/8 Inch Diameter
  • Steel w Polyurethane Bushing

Minimize sway and driver fatigue by improving the stability and driveability of your vehicle. The bar on this sturdy, effective anti-sway system mounts to the rear axle and to the frame to balance weight transfer and reduce body roll.


Features:

  • Minimizes side-to-side movement to improve overall stability of your vehicle
    • Lets you execute turns and quick maneuvers with confidence
    • Allows for a level ride, even on irregular surfaces
    • Reduces driver fatigue - minimizes effort required to keep your vehicle in line
  • Diminishes effects of crosswinds, passing motorists and shifting cargo
  • Designed to fit your vehicle and work in conjunction with its suspension system
    • Attaches to rear axle and to chassis - uses weight of axle to brace frame as it shifts in turns
    • Engineered to avoid interference with most popular aftermarket add-ons and accessories
  • Made with polyurethane bushings instead of the standard rubber variety for a longer-lasting system
    • Polyurethane is durable and resistant to damage caused by oil, gasoline and ozone
    • Less wear means less give in the system and better support
  • Constructed of thick 4140 chromoly steel for superior strength
  • Includes heavy-gauge mounting hardware, easy-to-follow instructions and bushing lubricant
  • Made in the USA


Specs:

  • Bar diameter: 1-3/8"
  • Limited Lifetime Warranty


Roadmaster Anti-Sway Bar Installed

Benefits of an Anti-Sway System

The Roadmaster anti-sway bar does for side-to-side movement what a good pair of shocks does for up-and-down motion. You will notice a marked improvement in your vehicle's stability as the bar works to balance weight transfer and reduce body roll. The anti-sway bar acts as a link between your vehicle's frame and its rear axle, using the axle as a brace to more effectively balance the shifting weight of your vehicle as you maneuver it. Lubricated bushings allow just enough pivot and rotation to compensate for the pressure placed on one side of your vehicle when it goes into sudden maneuvers, hits crosswinds or encounters shifting weights.


Roadmaster Anti-Sway Polyurethane Bushings

Superior Construction

The Roadmaster anti-sway bar is made of 4140 chromoly, a chromium and molybdenum steel alloy. This type of steel is considerably harder and stronger than the standard 1020 steel that is typically used in anti-sway applications. In addition, the larger diameter of the bar increases its torsional roll stiffness. The result is a bar that is not only stronger than the competition, but also nearly 30 percent better at resisting sway. The polyurethane bushings and grommets used at the attachment points are durable yet flexible, ensuring that the system is neither so rigid nor so malleable that it becomes ineffective.



1139-173 Road Master Anti-Sway Bar - Rear

Installation Details RM-1139-173 Installation instructions

This Product Fits The Following Vehicles




Customer Satisfaction Score:


Customer Reviews

Roadmaster Rear Anti-Sway Bar - 1-3/8" Diameter - RM-1139-173

Average Customer Rating:  4.8 out of 5 stars   (1769 Customer Reviews)

Minimize sway and driver fatigue by improving the stability and driveability of your vehicle. The bar on this sturdy, effective anti-sway system mounts to the rear axle and to the frame to balance weight transfer and reduce body roll.

by:

This is one of the best upgrades I have made to my 2016 F350 dually. The vehicle handles noticeable better while towing as well as without a load. I bought this stabilizer to help with body roll when cornering while towing my 19,000 lb 5th wheel. But I was surprised how well handling improved with an empty truck while driving down winding country roads. My truck now corners better than my wife’s Ford Escape (not exaggerating this). I state this a year after making this upgrade. If and when I buy a new truck, this will be one of the first upgrades I will make.

Rv T.

10/16/2022

Still amazed at how well this anti sway bar improves the handling of my 2016 F350 DRW both while towing and unladen.



by:
2013 Ford F-350 Super Duty

Best and easiest installation ever, great product and will be buying more product, thank you



by:

I absolutely love that you personalized every step of my order with the person that was doing that step. I will do business etrailer in the future. Thank you for bringing this personalisation back. The item arrived packaged very well. I have not had the time to put it on yet. I will update how it works at a later date.



by:
2018 Ford F-350 Super Duty

Great Product! A must have when hauling a slide in truck camper.



by:
Roadmaster

Have driven many miles with factory installed Sway bar - was garbage. Installed Roadmaster Rear sway bar improving our ride 100% as we felt more secure rounding corners traveling thousands of miles with less fatigue! Too Alaska & back!



by:

Well Built, Very Beefy and easy to Install on my 2020 F250



by:

Damn, that was quick delivering the parts. One box was ripped open as someone else mention but I'm grateful the hardware box didn't fall out. It's a tough product to deliver, guessing 60 pounds for the sway bar



by:
2019 Ford F-250 Super Duty

Looks great and installs easily.



by:
2015 Ford F-350 Super Duty

Installed this on my 2015 Ford F350 to help with truck camper sway. Super easy install for a Ford F350 if you already have the pencil thin stock sway bar. The Roadmaster model 1139-173 is the one you need since you can reuse your end links. The bar was packaged well. I was looking at the Hellwig Big wig first since it is cheaper and comes with new links. But it is extremely difficult to remove the existing link above the fuel tank. Also the Hellwig is a thinner bar. It came packaged very well and arrived only a few days after I purchased it on Etrailer. Overall very happy with the results. The truck corners well under load and sway is all but gone when fully loaded with the camper.



by:
2016 Ford F-350 Super Duty

It was a straight forward installation. I went with Roadmaster over Hellwig because the stock end links could be used. When you put this bar next to the stock bar, the Roadmaster is enormous in comparison. Looking forward to my first trip towing the 5th wheel.



by:

Night and day difference with it instal led.



by:

Sway bar works great. Bi notice once our 32 ft camper was behind it. Much better handling.



by:

Stock is a weeny little thing compared to this monster. Easy to replace, makes a huge difference in the turns!



by:
2012 Ford F-350 Super Duty

Excellent product which greatly improved control while loaded with the pickup camper. The challenge here was the shipping. An awkward part to ship which arrived with a destroyed box and missing the inner box of mounting hardware. Called etrailer and was told they would take care of it; then silence. I sent emails and left voice mails without a response until I called back on the main line and spoke to a different rep who let me know it was due to ship out that day. Excellent people who ultimately took care of me even though not their fault though I would recommend more communication to let me know they were taking care of the issue rather than let me guess for two weeks. Overall, etrailer has been excellent to work with and this was my third project with them. I will buy from them again. JB



by:

Great product! It was shipped fast and was easy yo install!!



by:



by:
2020 Ford F-250 Super Duty



by:



by:



by:

This product arrived on time, and is as described in company literature. I have installed the sway bars and the sumo springs on my 2019 Ford E3 26 foot Thor motorhome. Installation is fairly straightforward. Having said that, I am a retired farmer and I am quite familiar with this type of work. Having the proper tools makes the job go much quicker and easier. Installation of the front sway bar took a little under an hour. The rear sway bar is a bit more complicated to install, but he can be easily accomplished by someone of average mechanical skills, equipped with the proper tools. I strongly recommend removing the rear wheels to facilitate installation of the springs and the sway bar. I have not driven my motorhome yet, but will be taking an extended trip in March. I am looking forward to an improved ride.



by:

This sway bar is the real deal. Easy to follow instructions but I had it installed because I'm lazy. It took one hour labor



by:

OH My! If you are thinking about getting one for your P32 wide body. Please don’t hesitate. It REALLY Works. Take the white knuckle effect out of driving. EASY installation! Easy Ordering from etrailer. Roger helped me get through the buying process and shipped to my house in 2 days! Thank You!!



by:

I installed both front and rear Road Master anti sway bars on our last RV and they made a tremendous improvement in handling. It was easy for me to install by myself in my driveway on out Coachman Leprechaun 319MB. I highly recommend this product.



by:

This is on a 2004 Dodge 2500 with a 2500 lbs truck camper, Dirt bike on a hitch rack, and 2 mountain bikes on a front rack. The sway bar definitely helps. This one fit well around my stupid 5" exhaust that was installed by the previous owner. The Hellwig would not clear it. I have the Timbren SES and wedges in my leaf springs as well. The sway bar is a nice addition to those items. What I really notice is that when making emergency maneuvers or going off road, the truck corrects quicker than before and feels safer and less likely to tip over. I would not say the bar by itself will solve all of your issues, but couples with other remedies, it will help make your top heavy overloaded ride feel safer. With all my additions, I can confidently go the speed limit and often times well above through the Colorado mountains with no issues.



by:

On my 2021 Mercedes Benz class C Tiffin Wayfarer this rear anti-sway bar fit perfect. I didn’t have to make any modifications to the exhaust. With help I had it installed in 2 hours and 50 minutes. The pictures on the instructions could have been clearer to understand.


25
1619
Show More Reviews

See what our Experts say about this Roadmaster Anti-Sway Bars

  • Is Everything I Need to Install the Roadmaster Rear Anti-Sway Bar # RM-1139-173 on 2017 Ford F-250
    The Roadmaster Rear Anti-Sway Bar # RM-1139-173 contains the polyurethane bushings and mounting hardware to install onto your 2017 Ford F-250. The only extra item you would need is the end link kit. The sway bar and end link kit is available in one package, the Roadmaster Rear Anti-Sway Bar and End Link Kit # RM-1139-173-00. This kit will be everything you need to install the rear anti-sway bar on your 2017 Ford F-250.
    view full answer...
  • Will the Roadmaster Rear Anti-Sway Bar Work with Airbags on a 2014 Ford F-250
    I am not familiar with Lift Master airbags but the Roadmaster Rear Anti-Sway Bar for Pickup Trucks part # RM-1139-173 which is a fit for your 2014 Ford F-250 is just a replacement rear anti-sway bar for the factory anti-sway bar so there should be no reason whatsoever that it interferes with the airbag kit. I also took a look at some of the airbag kits we sell for your F-250 (Air Lift /Firestone) and none of them would pose any problems for an upgraded rear anti-sway bar like the Roadmaster...
    view full answer...
    Image 1 for
  • Recommended Rear Anti-Sway Bar For A 2018 Ford F-250 Super Duty
    For your 2018 Ford F-250 Roadmaster recommends the # Roadmaster Rear Anti-Sway Bar # RM-1139-173, which would just reuse the factory end links. The # RM-1139-173-00 comes with new end links for models that have other suspension enhancements that could cause clearance issues with the sway bar. Either way you'll be getting the correct anti-sway bar, the end links are more of a case by case situation. I've attached a short video below where Dave will explain the difference in greater detail...
    view full answer...
  • Compatible Rear Anti-Sway Bar For A 2015 Ford F-350 SRW 4x4
    Yes, the Roadmaster Rear Anti-Sway Bar and End Link Kit # RM-1139-173-00 would be the correct choice for your 2015 Ford F-350 since you don't already have a factory rear anti-sway bar in place. If you did have one in place you could just use the # RM-1139-173 since you wouldn't need the end link kit.
    view full answer...
  • Correct Rear Anti-Sway Bar for 2017 Ford F-350 Super Duty Pickup
    There are a few different options for your 2017 Ford F-350 Super Duty (crew cab, long bed, diesel) depending on the application. I'll list them below: Part # RM-1139-173 - 1-3/8 diameter factory replacement - Designed for single rear wheel pickups (all models). Part # RM-1139-173-00 - Designed for single rear wheel pickups (all models) where no factory rear bar is present. Part # RM-1139-193 - Designed for dual rear wheel pickups (all models).
    view full answer...
  • Replacement Front and Rear Sway Bar Recommendations for a 2014 Ford F-350 for Towing
    Going with a heavier sway bar on the front and rear of your 2014 Ford F-350 will help improve handling and stability when towing your fifth wheel trailer. For the rear you would want the part # RM-1139-173-00, for the front you would want the part # RM-1139-180.
    view full answer...
  • Will Aftermarket Differential Cover Interfere with Roadmaster Rear Sway Bar
    I reached out to my contact at Roadmaster and he said that the aftermarket differential cover on your F-250 won't cause any issues with the Rear Anti-Sway Bar # RM-1139-173. He said they actually specifically design their sway bars so that they wouldn't interfere with even large aftermarket diff covers. I have attached a short video review and the written installation instructions that you can check out as well.
    view full answer...
  • Rear Sway Bar Recommendation for a 2008 Ford F350 Dually
    The Roadmaster Rear Anti-Sway Bar # RM-1139-173 that you referenced will work on your 2008 Ford F-350 with dual rear wheels as Roadmaster has confirmed that it will work. This product installs utilizing the same installation hardware as the factory sway bar so it should not interfere with aftermarket exhaust as long as it is designed to be used with the factory sway bar. But since this product has not been tested with aftermarket exhaust I can not say for sure yes or no.
    view full answer...
  • Rear Anti-Sway Bar Fit for 2016 Ford F-350 Dual Rear Wheels
    The Roadmaster Rear Anti-Sway Bar 1136-173 is confirmed to fit your 2016 F-350 with dual rear wheels. If your truck does not currently have a factory sway bar you will want to order part # RM-1139-173-00 that comes with the end link kit. If your truck does have a factory sway bar, then you will just need to order the Roadmaster sway bar with part # RM-1139-173. I have linked an installation video of this anti-sway bar on a 2015 F-350 that had a factory sway bar for your to review.
    view full answer...
  • Recommended Anti-Sway Bars For A 2018 Ford F-350 XLT
    The Roadmaster Front Anti-Sway Bar # RM-1139-176 isn't a fit for your 2018 Ford F-350 but Roadmaster does have a rear anti-sway bar that is confirmed to fit with part # RM-1139-173. If your factory bar is missing or the end links are in need of replacement then you'll want part # RM-1139-173-00 instead to get everything. If you want to replace your front anti-sway bar as well then you'll need part # RM-1139-180 as well. As far as installation goes, these are fairly easy installations...
    view full answer...
  • RoadMaster Rear Anti-Sway Bar Diameter Difference From A Stock Rear Anti-Sway Bar
    The Roadmaster Rear Anti-Sway Bar Item # RM-1139-173 is 1-3/8" diameter in size while the stock anti-sway bar on the 2017 Ford F-350 Super Duty is around 1/2" thick. Since your 2017 Ford F-350 Super Duty is DRW you'll need the Roadmaster Rear Anti-Sway Bar Item # RM-1139-193 which has a diameter of 1-1/2".
    view full answer...
  • Which Roadmaster Anti-Sway Bar to Upgrade OEM Unit on 2012 Ford F-350 Dually
    The anti-sway bar you referenced, part # RM-1139-117 from Roadmaster, is intended for use on motor homes, but we do have an anti-sway bar for the 2012 Ford F350. For the F-350 pickup we offer a sway bar to replace the factory unit. This item is part # RM-1139-173. This requires the factory end links from the OEM sway bar for installation. If your F-350 does not have a factory sway bar you will need to purchase the end links from a Ford dealer. This part works with dually trucks.
    view full answer...
  • Sway Bar Recommendation for 2018 Ford F-250 without Sway Bars
    For a rear sway bar that fits your 2018 Ford F-250 that does not have a current sway bar you'd want the Roadmaster part # RM-1139-173 and/or for the front you'd want the part # RM-1139-180.
    view full answer...
  • How do the End Links From the Roadmaster Kit # RM-1139-173-00 Install on a 2015 Ford F-350
    Thank you for the questions about the Roadmaster Rear Anti-Sway Bar and End Link Kit # RM-1139-173-00 for your 2015 Ford F-350 Super Duty. I spoke with my contact at Roadmaster who wasn't sure why they don't have specific instructions for the end link kit but he did say that you just connect the links to the sway bar and then lift them up to holes in the frame which allow them to hang straight down. This kit is comprised of 2 different kits; the sway bar kit # RM-1139-173 and the End...
    view full answer...
  • Recommended Rear Anti-Sway Bar For A 2020 Ford F-250 Super Duty 4x4
    For your 2020 Ford F-250 Super Duty 4x4 I recommend the Roadmaster Rear Anti-Sway Bar # RM-1139-173 if you can reuse the current end links you have from the factory and save yourself some money. If you can't for whatever reason, maybe yours are damaged or you have some other kind of suspension enhancement giving you clearance issues, then you'll need the # RM-1139-173-00, which is the same sway bar but in a kit with the end links. I've attached a video where Dave runs through the installation...
    view full answer...
  • Is Drilling Required To Install the Roadmaster Rear Anti-Sway Bar On a 2015 Ford F-250
    The Roadmaster Rear Anti-Sway Bar and End Link Kit part # RM-1139-173-00 is a custom fit for your 2015 Ford F-250 which means there is no drilling required. I checked with Roadmaster to confirm this for you. There are brackets welded to the axle for the sway bar to attach and then pre-drilled hole in the frame for the end links to attach. The review that you were referencing was not on the same Roadmaster Rear Anti-Sway Bar and End Link Kit listed above but rather one similar in which...
    view full answer...
  • Is a Rear Sway Bar Required for Truck Bed Campers on a 2017 Ford F-250
    Though not required, you will certainly reap some benefits from installing an upgraded rear sway bar like the Roadmaster Rear Anti-Sway Bar and End Link Kit part # RM-1139-173-00 on the rear of your 2017 Ford F-250. The Timbren springs you already have installed will do a good job of supporting the added weight but will not really do much for sway control. The added weight of the truck bed camper will affect your truck's ability to corner safety and installing the upgraded rear sway bar...
    view full answer...
  • Does Roadmaster Rear Sway Bar for 2020 Ford F-250 Fit Tremor Package Models
    The Roadmaster rear sway bar part # RM-1139-173 fits all models of the 2020 Ford F-250 so it fits yours with the Tremor package as well.
    view full answer...
  • Sway Bar Recommendation for 2013 Ford F-350 King Ranch Single Rear Wheel
    The correct rear sway bar for your 2013 Ford F-350 SRW 4x4 is the Roadmaster part # RM-1139-173-00 that you referenced. This was designed for trucks like yours that do not have the factory sway bar and will do a great job improving the handling and stability when towing your fifth wheel and when not towing.
    view full answer...
  • Rear Anti-Sway Bar For a 2018 Ford F-350 Super Duty with Single Rear Wheels and No Factory Sway Bar
    You are correct! The Roadmaster Rear Anti-Sway Bar and End Link Kit # RM-1139-173-00 is the correct anti-sway bar for your 2018 Ford F-350 Super Duty with single rear wheels and no factory sway bar. I was able to verify this with Roadmaster.
    view full answer...
  • Will Roadmaster Sway Bar part # RM-1139-173-00 Work in Conjunction with Air Bag System
    Yes, the Roadmaster Sway Bar part # RM-1139-173-00 would work just fine on a vehicle that has Firestone air bags installed.
    view full answer...
  • Rear Anti-Sway Bar Fit on 2019 Ford F-350 Super Duty With no Factory Anti-Sway Bar
    Good question, and while we do have a rear anti-sway bar for your 2019 Ford F-350 Super Duty, the # RM-1139-173 is only for trucks that already have one, and there isn't a hardware kit that will allow installation of this anti-sway bar on a truck without one. So what you will need instead is a different anti-sway bar: - Roadmaster Rear Anti-Sway Bar # RM93VR The # RM93VR comes with the needed hardware for install on your '19 F-350, you just need to make sure the forward leaf spring bump...
    view full answer...
    Image 1 for
  • Center to Center Eye Measurement of B355 Roadmaster Endlinks Included in Kit RM-590170-00
    The B355 endlinks that come with the End Link Kit for Roadmaster Rear Anti-Sway Bar for Pickup Trucks # RM-590170-00 have a center hole measurement of 14 inches, while the overall length is 15-1/2 inches. I've attached a diagram to illustrate. The Endlink Kit is designed to be used with Roadmaster Rear Anti-Sway Bar # RM-1139-173, which fits certain model year Ford Super Duty trucks.
    view full answer...
    Image 1 for
  • Rear Sway Bar that Fits 2022 Ford F350
    For your 2022 Ford F-350 we have the part # RM93VR as a confirmed fit which would work great.
    view full answer...

Do you have a question about this Anti-Sway Bar?


Info for this part was:

Employee Lindsey S
Written by:
Lindsey S
Employee Jeff D
Installed by:
Jeff D
Employee David F
Installed by:
David F
Employee Jameson C
Expert Research:
Jameson C
Employee Victoria B
Expert Research:
Victoria B
Employee Dustin K
Video Edited:
Dustin K
Employee Wilson B
Updated by:
Wilson B
Employee Isabelle B
Updated by:
Isabelle B
Employee Sabrina W
Updated by:
Sabrina W
Employee Jonathan Y
Video by:
Jonathan Y
Employee Clayton O
Test Fit:
Clayton O

At etrailer.com we provide the best information available about the products we sell. We take the quality of our information seriously so that you can get the right part the first time. Let us know if anything is missing or if you have any questions.