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

Roadmaster Rear Anti-Sway Bar

Item # RM-1139-147
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Anti-Sway Bars

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Anti-Sway Bars RM-1139-147 - Rear - Roadmaster
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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. Call 800-298-8924 to order Roadmaster anti-sway bars part number RM-1139-147 or order online at etrailer.com. Free expert support on all Roadmaster products. Guaranteed Lowest Price 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-1139-147

  • Roadmaster
  • Anti-Sway Bar
  • Rear
  • 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 Reviews

Roadmaster Rear Anti-Sway Bar - RM-1139-147

Average Customer Rating:  4.8 out of 5 stars   (552 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.

- RM-1139-147
by:
Fleetwood

Very nice quality product and installation was pretty straight forward with the right tools, just take your time and do things step by step. This sway bar was installed on a 2004 Fleetwood Jamboree on E450 Chasis. Rides great now with less sway and more control! 466581



- RM-1139-147
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. 460014



- RM-1139-147
by:
2017 Ford E-Series Cutaway

Road master RM-1139-176 and road master RM-1139-147 front and rear sway bars for 2017 Ford econoline 450 - on 26xd Jayco Redhawk. Bought this Class C motorhome brand new. When I test drove it I knew I would have to replace the factory bars. They were way undersized. It was actually dangerous to drive and when we hooked up our flat tow it was really bad. When I installed the road master sway bars front and back it was really unbelievable at the difference it made. It actually made driving this class c enjoyable. Very stable. The bad sway is gone. Pulling my tow is now safe to do. These bars are expensive but I felt if it would help my swaying problem it would be worth it. My dealings with etrailer has been very positive and the videos they produce for installation is spot on. I highly recommend these sway bars. Also it took me working alone in my driveway about 3 hours to install the front and back bars. 464338



- RM-1139-147
by:
2018 Ford E-Series Cutaway

Great service team. I talked to Julie and Sherry and they both were very helpful. The quality of the products is top notch. I've shopped around and no one else has support or the selection like etrailer. 493080



- RM-1139-147
by:
Dodge Journey

Two reviews - 1 for the product. 1 for etrailer. Product: Prior to purchasing this rear sway bar, the corresponding front sway bar, and the reflex steering stabilizer, driving our Thor FE30 was frequently a white knuckle experience. Our journey has frequently taken us on I-40 and I-10. Both roads are subject to high cross winds. Additionally, there is heavy semi-truck traffic on these Interstates. Our RV was difficult to control in both of these situations. Frequently we were pushed outside of our lane. The installation was super easy on all of the components thanks to the etrailer videos. I was concerned about my drill being able to fit into the tight space to drill the holes necessary for the rear sway bar. I bought stubby drill bits and that worked perfectly. I did not even need to lift the RV off the ground for any of the components. So far I have taken the RV on I35 twice. It was quite windy both times. It was like driving a completely different RV. No wandering out of the lane. The steering felt much more in control. etrailer: This is the second purchase that I have made from etrailer. Both experiences have been fantastic. Both times I contacted eTrailer to make sure that I was getting the correct parts and all of the necessary components. Christina J helped me with the suspension and did a great job. The product reviews and installation videos are fantastic. I will continue to be an etrailer customer/fan. 475336



- RM-1139-147
by:
2017 Ford E-Series Cutaway

Put the Roadmaster Front Anti-Sway Bar (RM-1139-176) and Rear Anti-Sway Bar (RM-1139-147) on my 2018 Class C motorhome and noticed 1000% improvement in the driving and handling. Drove it from Texas to California and back. It handled like a sports car compared to before. My Son and I did the work ourselves. The instructions that came with the parts were helpful and easy to follow. I suggest watching the installation videos before starting the install. 599483



- RM-1139-147
by:

Just installed and did small road test and all seemed to be much better but still want to get the motorhome on the open road for the real test. Great service from e-trailer ( McCoy ) 658006



- RM-1139-147
by:

2017 E-450 Class C RV. I just received the road master front anti-sway bar: RM-1139-176, rear anti-sway bar:RM-1139-147and steering stabilizer: RM-RBK24-RSSC . I unboxed everything and Wow! what a difference compared to the other items. My son and I decided to go ahead and install the steering stabilizer- RM-RBK24-RSSC and it took us right at an hour. we would stop and watch the e-trailer video to make sure we were doing a proper assembly. It is a very helpful tutorial. The only concern I have is how close the tie-rod end of the steering stabilizer is to the radiator hose. It looks like it could come in contact. What we are going to try is to get a old radiator hose and cut a section out of it and wrap around the area where the contact could occur. I will post an update when we get the sway bars installed 350488



- RM-1139-147
by:
1997 Ford F-450 Cab and Chassis

Because I have an older rig- (97 Fleetwood Jamboree, 31 ft, class C) I wasn't able to find many reviews of the Roadmaster's improvements of this particular generation coach. Install was fairly straightforward, and on my initial short test drive I was very impressed. The rear of the whole rig was tight with way less body rolling, and handling on the highway has improved as well. After my short test drive, it was apparent that I will need to install the front anti- sway bar at some point as well. The rear is tight now, but the front still floats. I considered some other spring upgrades, but I'm happy I choose to start with the Roadmaster anti-sway bar. If the cost was lower, I would order and install the front now. 677752



- RM-1139-147
by:
2016 Ford E-Series Cutaway

I ordered both the Front and Rear anti-sway bar upgrade kits. The install on my 2016 E450 was quite simple, and accomplished easily in my driveway. The kit for the front was a simple remove and replace the OEM bar. The rear kit required drilling two holes to accomodate new mounting points. Other than that, it was also simply a matter of removing a few bolts, and replacing the factory bar. Some minor nits associated with the kits. The washers included in the kit for the rear didn't fit the bolts, also included in the kit. And, the instructions for the front kit didn't include torque specs for the bolts. A quick trip to the local hardware store, and a call to Roadmaster tech support solved the respective problems. Oddly, the Roadmaster tech guy read me THEIR instruction over the phone, and they DID include the necessary specs. I've intalled these kits on two different motor homes now. They work GREAT, and I highly recommend them if you're towing and it feels like the vehicle has a bit more roll than you like. HOWEVER, I would note that the difficulty of installation can vary widely. If you're planning to install yourself, I highly recommend downloading the instructions in advance, and crawling under your vehicle to check on accessibility. For the E450 kit, you'll have to be able to get under there with a drill, and not drill through any cables/lines that may run along the frame rails. You'll also have to be able to get a (typically somewhat large) torque wrench up in there. My experience suggests this can be nearly impossible on some vehicles without access to a grease pit or lift. Good luck! 302774



- RM-1139-147
by:
2018 Ford E-Series Cutaway

The ordering process was absent (that I could locate on the website) a contact telephone number so I was unable to ask any questions prior to ordering, A telephone number was provided after I placed the order on the ordering confirmation. The speed with which the order was activated, processed, shipped and received was more than satisfactory. I had ordered for a Ford E-350 cutaway/class C motorhome but when the order arrived the reference and instructions were identified as a sway bar for a Ford E-450. I tried to call etrailer to confirm the E-450 bar would fit my E-350 but after what I thought was an excessive hold time I hung up and called the manufacture. Roadmaster did confirm the E-450 would in fact fit the E-350. Both companies stated a "guaranteed fit" and a reasonable installation time based on, and considering relocation of the front mounting points (cannot use the original factory sway bar mounting points) and drilling new holes in the frame of the vehicle. If the new sway bar front legs were 3 1/2 inches longer then the factory mounting points could have been used and installation would have taken no more than an hour, and have made the "guaranteed to fit" a reality brag. And, in fairness there was small print reference to possible after market changes to a vehicle that might impact the new installation points. Well, after the purchase of a $100.00 metal cutting saw and over six and a half hours later, during which time I removed and relocated after market structure from my 2018 Thor 24F Class C motorhome, the "guaranteed fit" became reality. My ability to weld was also a benefit during installation. I guess the theory behind the "guaranteed fit" is if you modify your vehicle enough the sway bar will fit! Even though the installation videos did not cover any possible mounting issues or installation options, still they were very helpful in making sure my new sway bar was installed properly. After installation I noticed that the Ford V10 drive shaft does not run down the center of the vehicle which causes the bell housing to be off center. As a result of this position the sway bar/bell housing clearance on the passenger side right behind the rear axle in one spot is barely over a quarter inch. I called etrailer and was told, "I don't know about your clearance issue, but that is the correct sway bar for your vehicle". I guess that means I haven no problem to worry about or I have a time bomb back there while I am driving. Don't take it that the person I spoke with was not polite or trying to help me, he just didn't know or relieve my concerns. (Should he?) In summary, etrailer provided a very competitive price, handled my order quickly and kept me posted on shipping progress and to this point I believe provided me the correct part (as listed by Roadmaster) and provided a telephone number (after the purchase) that I could use to check on my order. All this adds up to four and a half stars in my book. But, what pulls my rating of etrailer lower is the lack of product measurements that would have permitted me to check for potential installation issues and a companion statement in bold print that any after market additions or modifications to the factory frame could require restructuring before the sway bar can be installed. If I had paid shop rate to have this bar installed my installation bill could have been over $600.00 or a shop may have refused the job because of liability concerns if they modify the motorhome frame structure, Ether way, this could have been more than a major disappointment. Since I have to share my feelings about the product installation with Roadmaster, I can't in fairness tag etrailer the total responsibility. I would like to rate the experience lower but I feel etrailer provided services that would be considered normal under most circumstances. 865910



- RM-1139-147
by:
Nissan Leaf

Product works great and absolutely made a difference in the handling and stability of my 28' E450 motorhome. Installation was made difficult because of factory location of the right rear leaf spring clamp from the vehicle factory. 862960



- RM-1139-147
by:
2017 Ford E-Series Cutaway

I didn’t have any problems installing the bar other then not having a 17/32 drill bit so I put off the links until day 2. 851040



- RM-1139-147
by:
2020 Thor Quantum Motorhome

Installed the RM-1139-147 Rear Sway Bar, RM-1139-176 Front Sway Bar and RM-RBK24-RSSC Reflex Steering Stabilizer for Class C Motorhomes. All three were easy after viewing the etrailer videos to install on a 2019 Ford E450 cutaway. Went test drive, on a windy day. Didn't feel like I had to fight the steering wheel to stay on course. Thank you. 846121



- RM-1139-147
by:

Great product. I installed myself with the help of a family member. We had to drill one hole in the I-beam to make the product fit.....otherwise no issues during installation. We have noticed a significant improvement in the handling of our Class C RV. Strongly recommend anyone with a Class C RV to make this investment to improve the handling of your RV. 845628



- RM-1139-147
by:
Ford

All Ford chassis motorhomes should have this from the start!!! 837955



- RM-1139-147
by:

Item was as expected. Installed myself. Went pretty well. RV handles noticeably better. 827568



- RM-1139-147
by:

I worked with the E trailer staff for recommendations for my 2017 E450 motorhome. I was having Sway issues and wind issues with semi trucks inside wind. They recommended a front and rear sway bar, a reflex steering stabilizer shock and the sumo springs helpers for the rear axle. I installed all four items at the same time and all my issues were solved. The coach drives very stable and the Rear of the motorhome does not Sage either. They were great help! 825099



- RM-1139-147
by:

etrailer was excellant. We had a fitment problem and they helped me get in touch with Roadmaster who finally solved the problem. etrailer was very helpful and helped with the whole process. I would highly recommend etrailer. Thanks! 809232



- RM-1139-147
by:
Winnebago

I put this rear sway bar on our 2020 Winnebago Spirit 31G. It was a huge upgrade from the stock bar. The thickness comparing the two Sway bars Side by side is night and day. The rear house sway before on turns or uneven surfaces was pretty drastic. Now it is minimal and much more controlled. Worth the money and a DIY install. 804475



- RM-1139-147
by:
Ford

We have a 32’ class C motorhome on a Ford E450 chassis. Spoke to Pat who recommended the rear sway bar and stabilizer from Roadmaster. WOW! Night & day. It was a pleasure to do business with them. Super knowledgeable and lightning quick shipping - I was notified the item was shipped within an hour. It shipped Friday and I received on Monday half way across the country. Definitely highly recommend. 804199



- RM-1139-147
by:

Not overly difficult for a one person install. Really make a difference when the semi's pass. Instead of being blown 2-3 foot to the side, now it is at most 6 inches. Mounted on a 32 foot 2015 Class C. 802697



- RM-1139-147
by:
2019 Ford F-450 Cab and Chassis

excellent service 793180



- RM-1139-147
by:
2019 Ford E-Series Cutaway

Very nice product and video and instructions are excellent. Best price on ETrailer. About 1.3 hours to install on Ford E-450 Winnebago Spirit. 785853



- RM-1139-147
by:

Easy install and very big improvement in handling 779426


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  • Rear Anti-Sway Kit for Thor Freedom Elite Class C Motorhome on Ford E-450 V10 Chassis
    The rear anti-sway bar we offer for the Thor Freedom Elite Class C motorhome based on the Ford E-450 V10 chassis is Roadmaster part # RM-1139-147. This 1-1/2-inch diameter bar replaces the factory sway bar. This kit fits the E-450 chassis from 1997 on. We no longer offer the Blue Ox kit you referenced.
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  • Sway Bar Recommendation for a 2004 Ford E350 Cutaway
    Roadmaster offers an anti-sway bar that is confirmed to fit your 2004 Ford E350 cutaway box van. You would want the Roadmaster Sway Bar part # RM-1139-117. If you wanted a front sway bar you would want the Roadmaster Front Anti-Sway Bar # RM-1139-115. I attached links to installation instructions for both products.
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  • 2015 Jayco GreyHawk On E-450 Chassis Sway Bar Recommendation to Improve Handling
    The best improvement you'll make is with the Roadmaster rear sway bar part # RM-1139-147 on your 2015 Jayco Greyhawk built on an E-450 chassis. For the front the correct replacement anti-sway bar is # RM-1139-176 which provides the next biggest improvement. Also at the front you can add a steering stabilizer. You would use # RM-RBK24-RSSC and your motorhome would handle MUCH better overall and in the conditions you mentioned as well.
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  • Sway Bar and Steering Stabilizer Recommendation for 2018 Thor 28Z Motorhome Chassis
    Your 2018 Thor 28Z is built on a 2017 Ford E-450 cutaway chassis. So for a rear sway bar you'd want the # RM-1139-147 which will make the biggest ride improvement, the part # RM-1139-176 for the front bar and then for the steering stabilizer part # RM-RBK24-RSSC and you'd be set.
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  • Roadmaster Anti-Sway Bars for 2014 Fleetwood Jamboree Sport 31M
    You are correct, the rear sway bar part number you need for your 2014 Fleetwood Jamboree Sport 31M Ford E450 is the part # RM-1139-163. Then for the front sway bar you'd want the part # RM-1139-189 and you'd be set. These will make a huge improvement in the ride quality of your motorhome so you'll be really happy with them.
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  • Which Sway Bars Fit 1997 Tioga Montara RV on Ford E-450 Chassis
    I checked with Roadmaster and for your 1997 Tioga Montara built on a Ford E-450 chassis the correct sway bars are the part # RM-1139-147 for the rear like you mentioned and then for the front part # RM-1139-115.
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  • Recommended Anti-Sway Bar for Fleetwood RV with 2017 Ford E450 Chassis
    For an anti-sway bar that will fit the Ford E450 chassis of your 2017 Fleetwood Jamboree RV, I recommend the Roadmaster Rear Anti-Sway Bar # RM-1139-147. This will mount to the rear axle of the Ford chassis to minimize sway and improve the stability of your vehicle. The system uses the weight of the axle to brace the frame as it shifts in turns. The heavy-gauge mounting hardware is included and I have attached the installation details for your review. For a front sway bar, I recommend...
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  • Rear Sway Bar Recommendation for a 2007 Ford E-450 Fleetwood Jamboree 26J
    We have a solution that will help the ride quality of your 2007 Ford E-450 motorhome, but none of the track bars will work with the air suspension. Instead you would want a rear sway bar part # RM-1139-147. This mounts to the rear axle and to the frame to balance weight transfer and reduce body roll. I attached an install video for you to check out as well.
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Info for this part was:

Expert Research:
Mike L
Expert Research:
Reno H
Expert Research:
Jameson C
Expert Research:
Adam R
Expert Research:
Jeffrey L
Written by:
Lindsey S
Installed by:
Jeff D
Video Edited:
Joshua S
Video Edited:
Jacob T
Video Edited:
Kathleen M
Video Edited:
Dustin K
Video Edited:
Chris R
Video Edited:
Zach D
Test Fit:
Nicholas E
Test Fit:
Randy B
Test Fit:
Brent H
Test Fit:
Robert C
Test Fit:
Conner L
Test Fit:
David F
Test Fit:
Ryan G
Updated by:
Sarah W
Updated by:
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Updated by:
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Video by:
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Video by:
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