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

Roadmaster Rear Anti-Sway Bar

Item # RM-1139-177
Retail:$676.56
Our Price: $584.26
You Save: $92.30
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.

This item qualifies for Free Shipping
Shipping Weight: 45 lbs
Quantity: 
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

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. 1-636-306-4830 to order Roadmaster anti-sway bars part number RM-1139-177 or order online at etrailer.com. Free expert support on all Roadmaster products. Guaranteed Lowest Price and Fastest Shipping for Roadmaster Rear Anti-Sway Bar. Anti-Sway Bars reviews from real customers.
  • All Info
  • Reviews (1318)
  • Q & A (0)
  • Photos
  • Why etrailer?

Roadmaster Anti-Sway Bars - RM-1139-177

  • Anti-Sway Bar
  • Roadmaster
  • Rear
  • Steel w Polyurethane Bushing
  • 1-1/8 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.


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 - RM-1139-177

Average Customer Rating:  4.8 out of 5 stars   (1318 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:

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 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:
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:
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:

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




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:
2016 Ford F-150




by:

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.




by:

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


Comments
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


by:

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 .


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


by:

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.


Comments
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


by:

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


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.


Comments
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


by:

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


Easy installs on my 2004 E-450. The new Roadmaster 1139-115 front sway bar and the Roadmaster 1139-147 rear sway bar greatly improved the handling and cornering of the motorhome. I have aDraw-Tite 65001 front mount receiver mounted and there were no problems when installing the front sway bar.


Comments
It is actually a pleasure to drive! When cornering the motorhome would lean and things would slide around and i even had kitchen drawers open. The problems that i had no longer exist. The cost and the work i did to install were well worth it!
Andrew - 06/18/2021


by:

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.


Comments
Great
Dale C - 12/18/2021


by:

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)




by:

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.




by:

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


I’ve been procrastinating for years, I should have donne this modo à long long time ago. What a difference it made on my Kodiak based RV handling. Stop putting it off Do it now, you won’t regret it.


Comments
A year ago we installed a front Sway bar and Davis trueTrack. The combination of these component greatly improved the stability of our Super-C Motorhome. Strongly these components if you have stability issues with your RV.
Daniel S - 08/05/2022


by:

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


Significant difference when making turns and going around curves. These twin I beam suspension have a tendency to follow uneven road surfaces, this pretty much eliminated a lot of that. Installed it myself with the Roadmaster end links and the only complaint I have is I had to enlarge bolt hole for the end link bolt, other than that, well satisfied. I also installed the rear sway bar at same time, highly recommend replacing the front and rear sway bars together.




by:

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


Delivery was fast and great.Paula S is a very excellent person to have working for your business She was very helpful in helping me out getting the right parts and fun to talk to. Thanks again for your help.




by:

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


11/2022 we were forced to leave Florida running from Hurricane Nicole. With 25mph cross winds and +15mph gusts our 2016 Vista LX, 31 footer, was a handful to say the least. Without eTrailers sway bars and bump stops we would have not been able to maintain our 50 to 55mph highway speed, better yet we probably would be in a ditch with other RV'S, 5th wheels and 18 wheelers. These items are amazing. I did have installed the Safe T Steer because eTrailer was way behind on their steering stabilizer. Thanks you eTrailer. BTW, if you are in the Indianapolis area I recommend Warner Springs on Bluff Rd. to do your install... Great people.




by:

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


Definitely a big difference in the drive! I was expecting longer bolts that hold the sway bar.




by:

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


The sway bar is high quality compared to the oem bar. I have a 2020 MBZ 2500 Sprinter 144. Basically, the roadmaster is three time the factory bar in terms of weight. And it shows. I took it on a ride down some winding roads and sharp turns and the back end feels much stiffer which equals control. I travel alot on Socal freeways to get to my destinations and it was very unnerving when driving next or passing freight trucks. I also pass through valleys and the winds can really making driving a bit uneasy. So, I anticipate this mod will add to my comfort level as well as my passengers. Time will tell. Now for some thing negative, well not quite but still some information buyers will need to know about installation. My van came with endlinks that were not compatible with the roadmaster. I knew this and order a set of end links for a 2019 model. Be aware that you will need new end links if you want to fit this bar to your 2020 model. At least that was the case for me. See pics. Overall, I'm satisfied and the cost is definitely worth the peace of mind.




by:

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


just took a short trip with my motorhome about 300 miles with new anti-sway bars installed on front and rear axles, totally impressed with ride and handling remove sway from my motorhome about 75 to 80 percent. I would recommend roadmaster's product and your company's knowledge and service, job well done, thank you




by:

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.



25
1318
Show More Reviews

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

  • 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...
  • 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...
  • 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...
  • 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...
  • 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...
  • 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...
  • 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...
  • 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...
  • Would Roadmaster Rear Sway Bar Affect Performance of Haul Gauge/Curt Better Weigh
    The rear sway bar part # RM-1139-177 would not affect the performance of your Haul Gauge which is now the Curt Better Weight part # C51701.
    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...
  • 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...
  • 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
  • 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...
  • 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...
  • 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...

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




  • Why etrailer.com?

    At etrailer.com we guarantee:
  • Real product know-how.

    We make sure that the products we sell are what we say they are, and that they work the way they are supposed to work. Get real advice from a real person who has the knowledge and expertise needed to solve your problem.
  • Most detailed, accurate anti-sway bar information available.

    Because we take providing accurate product information seriously, we take our own detailed product photos, demo videos and installation videos, as well as verify measurements, instructions, and vehicle fit information.
  • Installations, made easy.

    We love helping people and have the most highly-trained customer service, hands-on experience, step by step videos and installation instructions.
  • Fast shipping.

    Your order is automatically routed to get out of our warehouse and to your door as quickly as possible. Receive free shipping on orders over $99.
  • Personalized service for life.

    We provide one-on-one, personalized service from the ordering process through the life of your product.
  • Trusted since 1946.

    We've been serving customers since our parts store first opened in 1946 and continue to be recognized by our customers, our vendors and third parties for exceptional service.
  • Returns Policy

    Need to return an item? No problem. Please read our Returns Policy for more information.

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 Jonathan Y
Video by:
Jonathan Y

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.