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  1. Anti-Sway Bars
  2. Roadmaster
  3. Anti-Sway Bar
  4. Rear
  5. 1-3/8 Inch Diameter
  6. Mounting Hardware Included
THIS ITEM IS NOT A FIT FOR
2027 Subaru Ascent
Roadmaster

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

Part Number: RM-1139-173
In Stock
$550.00
Retail:$608.09
You Save: $58.09
Anti-Sway Bars
Not Confirmed to Fit

2027 Subaru Ascent

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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. 1-800-940-8924 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.
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Roadmaster Anti-Sway Bars - RM-1139-173

  • Anti-Sway Bar
  • Rear
  • Roadmaster
  • 1-3/8 Inch Diameter
  • Mounting Hardware Included
  • No Drilling Required
  • Fixed End Link

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



California residents: click here


Customer Satisfaction Score:

Ratings & Reviews

4.8

2123 reviews
5 Stars
(1808)
4 Stars
(220)
3 Stars
(40)
2 Stars
(19)
1 Star
(36)
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.

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Show More Reviews

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

  • Rear Anti-Sway Bar For 2009 Ford F-350 Super Duty Dually To Carry Cab Over Camper
    We do have the Hellwig # HE66GR sway bar but in my experience I prefer the Roadmaster units for very heavy loads. If your 2009 Ford F-350 Dually already came with a sway bar you will need the Sway Bar # RM-1139-173. Otherwise we have the Sway Bar # RM-1139-173-00 if you do not have a factory sway bar.
    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
  • Rear Sway Bar for 2018 Ford F-350 without OEM Sway Bar
    We have just what you need. If your 2018 Ford F-350 is a non-dually the sway bar you would need is the part # RM-1139-173 and you'd also need the end link kit # RM-590170-00 since you do not have a factory sway bar.
    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
  • 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 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
  • 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...
  • 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...
  • 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...
  • 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...
  • 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...
  • 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...
  • 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...
  • 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...
  • 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...
  • 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...
  • 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...
  • 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...
  • Sway Bars Compatible With Air Bags On a 2019 Ford F-250 Super Duty
    To help prevent the sway you are experiencing on your 2019 Ford F-250 you will want to add a sway bar. The Roadmaster Rear Anti-Sway Bar # RM93VR is for trucks that have the forward leaf spring bump pads bolted on to the frame. If yours are Riveted then you will need the Roadmaster Rear Anti-Sway Bar # RM-1139-173. These will greatly reduce the sway you are getting with your F-250 as they are manufactured to exceed OEM specifications. And since they are controlling the sway it will allow...
    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 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...
  • 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...
  • 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...
  • Will Roadmaster Rear Sway Bar Fit with Aftermarket Rear Differential Cover
    Hey Travis, while the Roadmaster rear sway bar part # RM-1139-173 wasn't tested with aftermarket differential covers I can pretty confidently say it will fit since there is quite a bit of clearance between the bar the differential like you can see in the attached picture.
    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
Employee Victoria B
Expert Research:
Victoria B
Employee Dustin K
Video Edited:
Dustin K
Employee John S
Video Edited:
John S
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

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