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

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

Item # RM-1139-177
Retail:$674.69
Our Price: $562.40
You Save: $112.29
Anti-Sway Bars

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Shipping Weight: 45 lbs
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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-1139-177 or order online at etrailer.com. Free expert support on all Roadmaster products. Great prices and Fastest Shipping for Roadmaster Rear Anti-Sway Bar - 1-1/8" Diameter. Anti-Sway Bars reviews from real customers.
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Roadmaster Anti-Sway Bars - RM-1139-177

  • Anti-Sway Bar
  • Roadmaster
  • Rear
  • 1-1/8 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: 1-1/8"
  • 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.



1139-177 Road Master Anti-Sway Bar - Rear

Installation Details RM-1139-177 Installation instructions

This Product Fits The Following Vehicles




Customer Satisfaction Score:


Customer Reviews

Roadmaster Rear Anti-Sway Bar - 1-1/8" Diameter - RM-1139-177

Average Customer Rating:  4.8 out of 5 stars   (1843 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:
2021 Ford F-150

Absolute love this sway bar. Truck feels very planted and stable. Purchased to improve towing stability consistently tow 20” cargo trailer at near gvwr. I can literally feel sway bar engaging as trailers sway or making corners.



by:
2016 Ford F-150

The guarantee to fit my 2016 F150 Ford was not correct. Mounting brackets to frame were too small. I had to contact Roadmaster and they expedited the correct brackets to me and everything bolted up properly. It does help with sway and especially with body roll on cornering.



by:

Working really well



by:
2016 Ford F-150

The anti sway bar is great arrived two day early. But it kicked my butt installing it. Not if it was the instructions or me. I'm going out looking for someone that has done this before.



by:

Well designed kit. Installation straight forward with a little bit of trouble, however I'm not exactly a mechanic, but I was able to do it. Pictures helped a lot but could have used a few more. Very happy with the improvement in my truck's handling. I wished I would have done this years ago.



by:

Great addition to the truck. Could feel the difference towing my rv trailer immediately.



by:
2015 Ford F-150

Worked great. Easy install. I installed the sway bar same day it arrived. Very happy with the results.



by:
2010 Ford F-150 Raptor

Works great. Easy to install.



by:



by:
2016 Ford F-150



by:

I have a 2017 Ford F350 Super Duty SRW, and we haul a heavy truck camper (Lance 1055.) I have Stable Load Uppers and HD airbags, but wanted to add a sway bar to add that extra layer of control, even though my truck has handled the camper well over the last 2 years and 10,000 miles. My truck did not come with an OEM sway bar installed, so I needed this kit that included the End Links too.

The Roadmaster Rear Sway Bar and End Links sold on etrailer are top quality products. They are robust and well made, with quality hardware to match. The product deserves a 5-star, and even unloaded, my truck handling improved right after installation, with improved cornering and no real impact on ride quality in my opinion. I have not yet loaded up our camper or towed our boat, but I have no doubt this sway bar will substantially reduce sway and will improve control and handling when the camper is loaded.

So why 4 stars and not 5?

1. I researched this product and the installation in detail. I planned on installing it myself and expected to find plenty of detail on etrailer's site, or Roadmaster's site, or the internet. My most pressing question was about where to mount the end links, and the orientation of the sway bar arms since I wouldn't be using the OEM end links. That information was no where to be found on the etrailer site, Roadmaster's site, or in any installation manuals. For a product and supplier that has likely sold lots of these to Ford Super Duty owners, I was surprised to find how little info was out there. The installation video on the etrailer site was helpful, but did not include any information for the end links, as they had a 2015 Super Duty and used the OEM end links already installed. I contacted etrailer and they told me to contact Roadmaster for more info on where to locate the end links with this kit.

2. I contacted Roadmaster. They told me they had no instructions and that despite my truck already having the cut-outs for the OEM bracket that attaches the OEM end links to the frame, that none of those holes may work for me. So they suggested I connect the sway bar brackets to the axle first and then see where the arms would line up with the end links. The tech also suggested that it wasn't critical that the end links were perpendicular
to the frame, but that I should try install the end links to allow the arm of the sway bar to hand as close to parallel as possible. No bueno. When I installed this the 14" end links (center hole to center hole) didn't allow for the arms to hang parallel to the frame. And I don't think it matters as the orientation of my sway bar and the arms looks about like every video or picture I could find on the internet of this year/model truck and this sway bar kit. It seems to function fine.

3. Installing it was a bear, especially the way they instructed me to. And I had to make some modifications to fit my truck, as the sway bar arms were rubbing up against my airbag mounting brackets. I got it installed, but the thin instructions turned what should have been a 60 minute job into 2 1/2 hours. A bit frustrating.

All in all, this will do the job intended and will provide me with peace of mind next time we load our camper. I am a bit frustrated that there were zero installation instructions specific to my year/make/model of truck given it did not have an OEM sway bar and the end links had to be installed with a bit of guesswork. You will also note in my pictures that I had to mount the end links to the sway bar arms differently on each side to make the bar fit around my air bag mounts.



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:

Fairly easy install. Drilling the hole in the frame was decent started with a 17/64 pilot hole then the 17/32 final hole. Take your time and let the drill do the work.
Do be aware of the hole placement on the drivers side as there are brake lines and wiring there.



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:

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:

Replaced the anti-sway bar on our 2019 F350. No special tools or jacks needed for the installation. Now our Lance 850 truck camper doesn’t sway nearly as much as before. Big improvement. Very pleased!



by:

Major driving experience I upgrades my 2020 Thor Motor Coach KW-29 with front & rear sway bar, front steering stabilizer shock, All 4 front/rear Koni shocks, & Rear End stabilizer to chassis all together best investment on my RV improvement handling, body sway when 18 wheeler passing u up minimizing body sway from minor to none at all, reduce fatigue while driving course correcting steering reducing stress. Each component was felt the improvement but all together it’s been major improvement & experience



by:

The last thing to upgrade my front suspension on my 2018 Winnebago Aspect 27k. Money well spent! Easy installation, the ride greatly improved. Etrailer shipped this fast and I'm very pleased. Thanks.



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:

E trailer is.my go to place for anything towing trailering etc Absolutely the best products as well and the best service and the best people!!!!



by:

Free from the roller-coaster ride my 2022 thor motorhome had with the factory bars.I have questions about why these companies don't install the suspension while building the rv.



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:

After reading all the information regarding fitment for my 2001 Freightliner Chassis I purchased this rear anti sway bar kit which had a side note stating that if your chassis had different u bolts, which my chassis does I could contact Roadmaster engineering direct for the correct parts. I did contact them directly and they referred me to e trailer, who referred me to Roadmaster, pass the buck game. So after a year I have a half installed anti sway bar kit that is useless and unreturnable because it was half installed waiting for answers that never came. A waste of my time and hard-earned money NOT HAPPY.



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.



by:

The antisway bar was a great investment. Between Etrailer'S videos and the packaged instructions, the installation was straight forward. Great product.


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

  • Is Drilling Required to Install Upgraded Rear Anti-Sway Bar on a 2015 Ford F-150
    I checked with Roadmaster and to install rear anti-sway bar # RM-1139-177 on your 2015 Ford F-150 you will need to drill into the frame as you mentioned. You would use the step up method of drilling to get to a 1/2 inch hole (Roadmaster indicated the bolts are slightly larger than 1/2 inch). To help protect against corrosion you can use something as simple as spray paint to coat the exposed steel. Some thread locker such as # LT37643 will also help. This product was a waxy consistency...
    view full answer...
  • Is There a Roadmaster Rear Anti-Sway Bar for a 2019 Ford Ranger
    I have a solution for you to add some suspension help on the rear end of your 2019 Ford Ranger, but Roadmaster does not make a rear anti-sway bar for that particular vehicle. Typically the Roadmaster suspension enhancement parts are only available for Class A or Class C RV or heavy vehicle chassis'. However, a really easy to install and helpful suspension enhancement for your Ranger that I recommend is the SumoSprings Solo Custom Helper Springs - Rear Axle # SS86MR. These helper springs...
    view full answer...
  • Recommended Sway Bar for a 2014 Ford F-150
    We have what you need. The Roadmaster Rear Anti-Sway Bar part # RM-1139-177 is designed specifically for your 2014 Ford F-150. The sway bar is made of a very strong chromoly steel. It does a great job of keeping your vehicle leveled out side to side during quick maneuvers and on uneven pavement. This will add a great deal in the handling area of your F-150 making it a more enjoyable vehicle to drive. I've included a video to shoe you all of the components that come with the kit. The...
    view full answer...
  • Trouble Installing Roadmaster Sway Bar On a 2016 Ford F-150
    The hangers for the Roadmaster Rear Anti-Sway Bar # RM-1139-177 do not have to be perfectly straight up and down but the closer they are to vertical the better the sway bar will work. I have linked a copy of the installation instructions below that do show the passenger side frame bracket mounted just behind the exhaust hanger on page 3. This will be a good reference point for you to mount the frame bracket.
    view full answer...
  • Sway Control Options For A 2017 F-150
    I do have a sway control option available for you, however, the Roadmaster Rear Anti-Sway Bar for Pickup Trucks part # RM-1139-177 is not confirmed to fit a 2017 F-150. Instead, I recommend using RoadActive Suspension Kit part # RAS3611-B for 2WD and part # RAS3611-Y for 4WD models. The RAS system works to not only reduce sway but also eliminates bottoming out, axle wrap and wheel hop. I have attached a video review of this product for you.
    view full answer...
  • Sway Control Recommendation for a 2012 Ford F150 4WD
    With as light of a trailer as you have I would be surprised if sway became an issue for you. The best defense against sway is proper trailer loading though. If you can load as much weight of your trailer as far forward as possible the likelihood of sway occurring will be even less. If you did want to run a friction sway control system you would first want the sway control adapter part # RP26003. Then for a sway control unit you would want the # 83660.
    view full answer...
  • Can Roadmaster Rear Sway Bar for 2016 Ford F-150 with Air Bag Kit Installed
    The Roadmaster rear sway bar part # RM-1139-177 for your 2016 Ford F-150 is perfectly compatible with the air bag suspension kit you have installed.
    view full answer...
  • Would Firestone Air Bag Suspension Prevent Trailer Sway
    I doubt the air bags would do what you're wanting them to do. Their primary purpose is to suspend the weight of anything carried in the bed of the truck. It sounds as if you would be the perfect candidate for an anti-sway bar like part # RM-1139-177. A sway bar would do a much better job of accomplishing what you're looking for. If you can tell me which type of anti-sway system you're using, I might be able to make further recommendations.
    view full answer...
  • Sway Bar Recommendation for 2016 Ford F-150
    For your 2016 Ford F-150 we have the Roadmaster sway bar part # RM-1139-177 as a confirmed fit which would work well for you. This will greatly reduce body-roll on your camper setup and will make driving much easier.
    view full answer...
  • Cost Effective Camper Tie Downs for Use with 2017 Ford F-150
    I called my contact at Brophy and they informed me that they tested the Brophy Clamp On Camper Tie-Downs part # HSAB on an aluminum body Ford F-Series pickup and didn't have any problems doing so therefore, yes they will work well for you. If you have a drop in bedliner that extends up to the side rails on the bed then they will need to be trimmed in order for the camper tie-downs to mount properly. In order to secure the truck bed camper to the tie-downs you will need a set of turnbuckles...
    view full answer...
  • Will the Roadmaster Sway Bar part # RM-1139-177 fit a 2013 Ford F-150 Raptor
    Yes, I spoke with my contact at Roadmaster and he confirmed that the Roadmaster Sway Bar part # RM-1139-177 that you referenced is confirmed to fit your 2013 Ford F-150 Raptor.
    view full answer...
  • Recommended Rear Anti-Sway Bar for a 2012 Ford F-150
    1.25 would actually be 0.05" smaller, so it wouldn't be too big - but the Roadmaster Rear Anti-Sway Bar # RM-1139-177 you're looking at has a bar diameter of 1.13" (1 1/8"). Although it may seem small, it's going to work just fine with your 2012 F-150 and will still do an excellent job minimizing sway.
    view full answer...
  • Available Anti-Sway Stabilizer Bar for a 2015 Ford F-150
    For an anti-sway bar that is a confirmed fit for your 2015 Ford F-150 I recommend taking a look at the Roadmaster Rear Anti-Sway Bar # RM-1139-177. The bar attaches to your rear axle and chassis, enhancing stability by diminishing the roll that can be caused by winds or shifting cargo. You may also want to consider the Timbren Rear Suspension Enhancement System # TFR1504E if your stability issues are happening when you are hauling cargo. These springs simply sit above your rear axle, minimizing...
    view full answer...
    Image 1 for
  • Rear Sway Bar Recommendation for a 2015 Ford F-150 with 6 inch Lift
    Since a 6 inch lift would be a suspension lift you would be able to install the sway bar part # RM-1139-177 on your 2015 Ford F-150. You will have to use the lift kit adapter as well though, part # RM590046-00. I confirmed this fit with my contact at Roadmaster.
    view full answer...
  • Solution for Sway of 2016 Ford F150 At 65 mph
    I'm assuming that this isn't happening when you're not towing, correct? When the trailer is hitched up, and the Equal-I-zer weight distribution system is used the trailer is locked into place behind the trailer, more or less forced to track along behind the truck. Ruts or undulations in the pavement can cause the rear truck axle to sway a bit, which causes the yaw you mentioned. Roadmaster offers a rear anti-sway bar, part # RM-1139-177 that will keep the rear truck axle perpendicular...
    view full answer...
  • Does the Roadmaster Rear Anti-Sway Bar item # RM-1139-177 Work w/ a 2012 F-150 w/ a Axle Flip Kit?
    Possibly! The Roadmaster Rear Anti-Sway Bar item # RM-1139-177 is designed with the stock suspension in mind on your 2012 F150 FX2 so it's hard to say yes or no. The main issue I see is new components from the kit being in the way and the frame mounts having to be installed in a different spot to compensate for the difference in height to the frame. I have linked the installation instructions below and it's got some detailed pictures. I recommend taking a look at them and then comparing...
    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 Michael H
Expert Research:
Michael H
Employee Jameson C
Expert Research:
Jameson C
Employee Jeff D
Installed by:
Jeff D
Employee David F
Installed by:
David F
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

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