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

Roadmaster Rear Anti-Sway Bar - 1-1/2" Diameter

Part Number: RM-1139-147
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$715.00
Retail:$949.06
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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. 1-800-940-8924 to order Roadmaster anti-sway bars part number RM-1139-147 or order online at etrailer.com. Free expert support on all Roadmaster products. Great prices and Fastest Shipping for Roadmaster Rear Anti-Sway Bar - 1-1/2" Diameter. Anti-Sway Bars reviews from real customers.
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  • Reviews (2036)
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Roadmaster Anti-Sway Bars - RM-1139-147

  • Anti-Sway Bar
  • Rear
  • Roadmaster
  • 1-1/2 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
  • Works with front anti-sway bar (sold separately) for absolute stability - available on certain applications only
  • Made in the USA


Specs:

  • Bar diameter: 1-1/2"
  • 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.



1139-147 Road Master Anti-Sway Bar - Rear

Installation Details RM-1139-147 Installation instructions

This Product Fits The Following Vehicles




Customer Satisfaction Score:


Customer Reviews

Roadmaster Rear Anti-Sway Bar - 1-1/2" Diameter - RM-1139-147

Average Customer Rating:  4.8 out of 5 stars   (2036 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:
2017 Ford E-Series Cutaway

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.

Terry profile picture

Terry

4/3/2024

Works better than expected. The rear sway bar on my 2017 F 450 made more difference than any other modification I made.



by:

Was told from etrailer that this was going to be a quick plug and play but no this was to be installed on a class c ( no drilling) but no , ustraps had to be adjusted did not fit and struts would not reach had to drill chasis

Jenny N. profile picture
Etrailer Expert

Jenny N.

5/30/2024

I certainly apologize for any misinformation that was given. The endlinks for the Roadmaster Anti-Sway Bar mount to the frame in a different location than the factory endlink. There are new holes must be drilled in the frame to ensure correct orientation of the new endlinks.



by:

Solid-built sway bar. Helps stabilize in wind while driving. Using on 2016 Thor Vegas 25.3 RV, notorious for suspension and driving issues. Using front anti-sway bar as well with Safe-T-Plus steering stabilizer.



by:

I watched your video on the installation of the rear sway bar which I found to be helpful. I used an adjustable strap to level the sway bar before aligning and drilling for the links. Looking forward to a road test soon. Thank You

Jarry profile picture

Jarry

7/4/2024

I replaced the front and rear sway bars.Money well spent. We made a trip to the coast which we do several times a year. The ride and handling after the upgrade was noticeable as soon as we got on the highway.Climbs,descents and sweeping turns are now not even noticeable.We consider this upgrade an investment. Best ,Jarry



by:

Worth every penny in handling and stability performance gained on Entegra Odyssey 24B (was not standard on 2021 model) Performance was gained along with Roadmaster Front Anti-sway bar and, not rear alone. Also added Roadmaster steering stabilizer at same time.



by:

Helped with sway but not with wandering steering.

Mike profile picture

Mike

8/29/2024

Great! Keeps the sway out of the drive. Stiffens the suspension interns with dips. Did not remove the tail wagging but the panhard bar did remove more of that. Steering still like sawing wood! Bought an exact center steering stabilizer and the original had a 2 inch soft spot in the center. Hoping the exact center fixes it ... Havent driven it yet.



by:

Dit this job my self , no lift , on the floor on my back and got it installed. Front and rear anti sway bars and 4 new bilstein shocks and yes u need the 8 swivel head socket/wrench tool from harbor freight to do driver side. The rest of the instalation whent well, the onley consern is the front bracket sadle and bushing sits nearly on the bend of the sway bar ( see photo )



by:
Honda Odyssey

Installed sway using hand tools. Relatively easy install on a Class C Entegra Odyssey that sits on a Ford E-450 chassis. Unloading the rear is not required for install; however, raising the rear gives you more working room. Once installed, I noticed a marked improvement in reduced body lean going around corners. Front Sway Bar is next.



by:
Thor

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:

I have had these anti-sway bars for around one year. The installation by etrailer was great and the bars work fine. No question that they helped to reduce the impact of trucks blowing by my RV and pushing me off to the side. Glad I purchased them.



by:

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.

Jose profile picture

Jose

12/13/2021

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.



by:

Customer service is the best in the industry. Sway bar exceeds all my hopes on vehicle.



by:

This way bar is very thick extremely rigid. The small links that attach it to the frame brittle. They snap and break off right away. The linkages are defective, If you had a tow rope you would not use dental floss to attach it with. That seems to be the case here Made a great big thick sway bar and no way to attach it Correctly. Actually just look at the picture and see the thick sway bar and look at the link I just and you'll wonder how that will work, it won't

Jenny N. profile picture
Etrailer Expert

Jenny N.

10/6/2023

It is unusual that the end links would not hold up. I wanted to ask a few questions. Do you have a Thor Chateau 2019 -2022 E-350 Class C or a 2016-2022 E-450 Class C? Would you be able to send a picture of the end links on your motorhome?



by:
Roadmaster

What a phenomenal difference driving my motorhome after upgrading to the Roadmaster swaybars front and back. Install was straightforward and only took an hour or so per axel. Money well spent!



by:

The sway bars have really stabilized my 2019 Minnie Winnie Class C in the wind and passing semi-trucks



by:
Roadmaster

Product arrived quickly as usual with etrailer. The etrailer video was more handy than the accompanying instructions from Roadmaster. etrailer provided videos for both the early E450 and the later chassis installations. While essentially the same, there was a small difference of enlarging an existing hole on the early frame in my case a 2006 and having to measure to locate the hole on the later. It would be nice if Roadmaster included a parts diagram to help with assembly instead of small not clear pictures. I thought the parts package was short two half inch washers, I supplied them from my stock. The fittings on the Roadmaster bar are much heavier than the stock components. Installation is on a 2007 Coach House, motorhome. Took it for a test drive, big difference in handling.



by:

This product has performed exceptionally. We experienced extreme winds without significant lane-changing effects on Wyoming highways and very little side to side drift when passed by large trucks. I installed the front sway bar without too much effort but the rear bar was a bit more difficult to install so I had a local Mechanic do the work. I’m very pleased with my purchase.



by:

Ordered front and back and steering stabilizer, the anti- sway bars were delivered and I had them installed, the steering stabilizer still has not arrived ordered in March.

Charles profile picture

Charles

8/26/2023

Anti sway bars have been on over a year still believe was a great investment holds you steady. As for steering stabilizer that one was never shipped from roadmaster. Went with safe t plus and very happy with it.



by:

Upgrade almost complete on my E450 Quantum LF31. Not hard to install the items. Only have the rear sway bar next month and upgrade will be complete. I also have air bags on the back which helped with the weigh transfer on the unit.



by:

Heavy duty sway bar just what I needed and fast shipping



by:

etrailer has always been top notch for value, getting your order delivered promptly and most importantly their customer service.



by:

Yes it made a big difference to the way it handles n handles better when big trucks pass would recommend it



by:
2021 Ford E-Series Cutaway

need more clarifaction on ford cutaway did they not produce during covid? plackard on door says 2020 title says 2022



by:

Helped with the sway in windy conditions and meeting people, I am also adding timbren this year



by:

Wow, what a difference the sway bars have made. No more fighting with the steering wheel in high winds. Heavy duty quality parts . Can’t wait to get the Exact Center steering stabilizer put on next.


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