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

Roadmaster Rear Anti-Sway Bar

Item # RM-1139-173
Our Price: $449.34
You Save: $49.13
Anti-Sway Bars

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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. 1-636-306-4830 to order Roadmaster anti-sway bars part number RM-1139-173 or order online at Free expert support on all Roadmaster products. Great prices and Fastest Shipping for Roadmaster Rear Anti-Sway Bar. Anti-Sway Bars reviews from real customers.
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Roadmaster Anti-Sway Bars - RM-1139-173

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

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.


  • 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


  • 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 - RM-1139-173

Average Customer Rating:  4.8 out of 5 stars   (1327 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.


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.

Still amazed at how well this anti sway bar improves the handling of my 2016 F350 DRW both while towing and unladen.
RV t - 10/16/2022


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!

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


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


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


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

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.

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.


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


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

2020 Ford F-250 Super Duty





Review from a similar Sway Bar with Bushing Kit in Anti-Sway Bars

The Roadmaster Anti-Sway Bar is of excellent quality. All of the parts are heavy duty and fit exactly the way they should. I have a 2003 Fleetwood on a Workhorse W22 chassis and considering the age all of the factory bolts and nuts came off without any issues. Installation was easy following the printed instructions and the online video. I really recommend this product.


Review from a similar Sway Bar with Bushing Kit in Anti-Sway Bars

Very nice High Quality Anti-Sway Bar!
picked up the end links and fabricated the frame mounts for the end links.
Turned out great and made a very significant improvement in the ride and stability.


Review from a similar Sway Bar with Bushing Kit in Anti-Sway Bars

Very straightforward installation and all the parts were of high quality. This is a substantial, solid sway bar. My RV feels a lot more solid on the road in curves etc. Very satisfied with the product.


Review from a similar Sway Bar with Bushing Kit in Anti-Sway Bars

I installed the front and rear Anti-sway bars with the steering shock.
I am 100% satisfied with the outcome and handling of my RV while driving down the road.
I would highly recommend the installation of these items on any RV

You just cant go wrong installing these kits to you RV. Next thing i looking to install is the air suspension kit and new shocks.
marcus - 09/21/2021


Review from a similar Sway Bar with Bushing Kit in Anti-Sway Bars

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!!


Review from a similar Sway Bar with Bushing Kit in Anti-Sway Bars

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


Review from a similar Sway Bar with Bushing Kit in Anti-Sway Bars

Was an fairly easy install with two people , has held up well so far . Helped stop sway with my top heavy truck camper load. At the time it was the only sway bar that fit the ram 3500 with 6.4 gas hemi due to exhaust system interference with other brands .

Sway bar has held up well since installation.
Michael - 06/07/2022


Review from a similar Sway Bar with Bushing Kit in Anti-Sway Bars

I recently purchased a 2011 Itasca Cambria 28 with only 10,500 miles. Our first trip made it clear that I needed to stiffen the chassis. Unfortunately Roadmaster Anti-sway bars are backordered, and though you should put those on first, I just installed the Steering Dampener. Easy installation though you need to be careful about seating the bushings. The videos are much better than the printed instructions. Already see a big difference in how much tighter the steering is. Can't wait for the bars to arrive. Disappointed to have to wait 4 weeks.

One year later, we have put over 22,000 miles on our rig, and added new tires. The ride is so amazingly better than without the steering stabilizer, and especially the anti sway bars. These additions are absolutely worth the time and money. I would strongly recommend them. You won’t regret it.
Jose - 12/13/2021


Review from a similar Sway Bar with Bushing Kit in Anti-Sway Bars

Relatively easy installation on my 2004 Ram 3500. It would have been easier if I had removed the spare tire. I only noted a few minor issues. The instructions say to mount the U brackets to the rear two holes in the shock mounts. However, on this truck the shocks mount one in front and one in rear. Therefore, the passenger side mounts in the rear two holes, but the driver side mounts in the front two holes. Otherwise all went well.

Dale C - 12/18/2021


Review from a similar Sway Bar with Bushing Kit in Anti-Sway Bars

Très satisfaits de mon achat, avec mon campeur bigfoot la différence est notable

(Very satisfied with my purchase, with my bigfoot camper the difference is noticeable)


Review from a similar Sway Bar with Bushing Kit in Anti-Sway Bars

Last year I installed the Sumo Springs (lighter load rated) front and rear and rear Koni FSD dampeners which helped noticeably on my 2017 Winnebago View 24J by stabilizing the ride.
I finally installed the Roadmaster rear anti sway bar RM 1209-120 immediately after receiving today. Absolutely worth the low cost for the major improvement in ride comfort and stability. These are direct bolt on replacements for the OEM Mercedes part and utilize the stock mounting bracket hardware.
For a total of less than $xxx I have completely transformed the ride of my Class C motorhome.

Show More Reviews

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

  • 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...
  • 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...
  • 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...
  • 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...
  • 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...
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  • 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...
  • 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...
  • 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...
  • 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...
  • 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...
  • 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...
  • 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...
  • 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 two anti-sway products for the 2012 Ford F350. Their fit will depend on the version of the F-350 you have. 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...
    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...
  • 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
  • End Link Kit For Installing Roadmaster # RM-1139-173 Anti-Sway Bar on 2015 Ford F-350
    I have confirmed with my contact in the Tech. Services department at Roadmaster that you will need the # RM-590170-00 end link kit. You can order the kit and see current pricing by clicking the provided link.
    view full answer...
  • Which Roadmaster Rear Anti-Sway Bar and End Links for 2020 Ford F-350 Single Rear Wheel
    This is correct. For your 2020 Ford F-350 you will want to use the Roadmaster Rear Anti-Sway Bar # RM-1139-173 and End Link Kit for Roadmaster Rear Anti-Sway Bar for Pickup Trucks # RM-590170-00. These are the correct parts for your truck, but because there is not a rear anti-sway bar present you will likely need to drill holes to mount the end links, per my tech contact at Roadmaster. I've linked some review videos on these parts for you to check out, as well.
    view full answer...
  • 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...
  • 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
  • How To Improve The Suspension On Your 2017 Ford F-250
    In order to gain the most stability and support for your 2017 Ford F250, you will want to install both support and sway control components. The most economical way to add support to your truck is by using the Timbren Suspension Enhancement System part # TFR250SDJ. The Timbren springs are a good way to add additional support to your vehicle while towing or hauling a heavy load however, the best way to add support to your truck would involve installing air bags such as the Firestone Ride-Rite...
    view full answer...
  • Can a Rear Sway Bar be Installed with Firestone Air Bags?
    There will be no issues at all installing a rear sway bar and air bag kit on your 2015 Ford F-250. As examples, the Firestone # F2597 will install in a different location than the Roadmaster # RM-1139-173-00. I included install videos of both of these products that show this as well. I do need to say that the # RM-1139-173-00 is specifically designed for vehicles that do not have a factory sway bar though. If you do currently have a factory one and are replacing it, you will need the #...
    view full answer...
  • Can RoadActive Suspension and Anti-Sway Bar Both be Used on 2017 Ford F-250
    You can certainly add both of these to your 2017 Ford F-250. The RoadActive Suspension Custom Leaf Spring Enhancement Kit # RAS3611-SLHD and Roadmaster Rear Anti-Sway Bar # RM-1139-173 would work well together. The Sway bar is going to help minimize side-to-side movement and helps balance weight transfer. It is especially helpful for top heavy loads and keeping your vehicle in line. The RAS kit will support and strengthen your leaf springs for an improved ride quality. These will also...
    view full answer...
  • How do I Prevent Sway in my 2011 Ford F-350 with an In-Bed Camper
    To correct your sway issue I highly recommend starting with a Roadmaster Rear Anti-Sway Bar part # RM-1139-173 and Roadmaster Front Anti-Sway Bar part # RM-1139-180 this solid 1 1/2" 4140 Chromoly sway bars are far superior to the current ones installed. The stiffer and thicker material will be much better suited to the forces put on it with the in bed camper. The second upgrade I recommend is the SumoSprings Solo Custom Helper Springs part # SSR-114-47 These will help to take a lot of...
    view full answer...

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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
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Expert Research:
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Employee Dustin K
Video Edited:
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