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Roadmaster Polyurethane Bushing Kit for 1-3/8" Diameter, Factory Rear Anti-Sway

Roadmaster Polyurethane Bushing Kit for 1-3/8" Diameter, Factory Rear Anti-Sway

Item # RM-4139-300
Our Price: $126.55
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Attach these durable, flexible polyurethane bushings to the rear anti-sway bar of your vehicle and experience a better, more controlled ride. 1-800-940-8924 to order Roadmaster accessories and parts part number RM-4139-300 or order online at Free expert support on all Roadmaster products. Great prices and Fastest Shipping for Roadmaster Polyurethane Bushing Kit for 1-3/8" Diameter, Factory Rear Anti-Sway. Accessories and Parts reviews from real customers.
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  • Reviews (58)
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Roadmaster Accessories and Parts - RM-4139-300

  • Anti-Sway Bars
  • Anti-Sway Bar Parts
  • Bushings
  • Roadmaster
  • 1-3/8 Inch Diameter
  • Rear Anti-Sway Bar

Attach these durable, flexible polyurethane bushings to the rear anti-sway bar of your vehicle and experience a better, more controlled ride.


  • Replacement bushings work with your factory, rear anti-sway bar to improve the overall stability of your vehicle
  • Flexible design keeps anti-sway system from being too rigid
  • Polyurethane is durable and resistant to damage caused by oil, gasoline and ozone
    • Less wear means less give in your anti-sway system and better support
  • 2 Bushings and necessary hardware included
  • Made in USA

Roadmaster Anti-Sway Polyurethane Bushings

Superior Construction

The lubricated bushings in your anti-sway system 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. These bushings, therefore, must be both durable and flexible. Polyurethane allows an appropriate amount of give and lasts longer than rubber, which is the standard material used in bushings, thus ensuring that the system is neither so rigid nor so malleable that it becomes ineffective.

4139-300 Roadmaster Bushing Kit for Rear Anti-Sway Bar

This Product Fits The Following Vehicles

Customer Satisfaction Score:

Customer Reviews

Roadmaster Polyurethane Bushing Kit for 1-3/8" Diameter, Factory Rear Anti-Sway - RM-4139-300

Average Customer Rating:  4.8 out of 5 stars   (58 Customer Reviews)

Attach these durable, flexible polyurethane bushings to the rear anti-sway bar of your vehicle and experience a better, more controlled ride.


I like what the kit offered but I was unable to utilize all of it. My Ford F53 anti sway bar was loose due to missing saddle bracket and only one bolt holding the other saddle bracket. Due to potential damage to other bushings I ordered this kit. During installation of the saddle brackets I discovered that there were no nuts where the missing saddle bracket was supposed to be attached. The kit did not have nuts so I had to purchase nuts (and bolts).
When I tried to replace the link bushings I tried removing the old bushings exactly as advised in the instructions. However, the bushings would not break loose even trying to use a hammer to tighten the vise with the two different size sockets placed as instructed. Therefore I was not able to use the new link bushings (very disappointed). Overall, I was only able to use a small number of parts that came in the kit. The saddle brackets and bushings were all I could make use of and I had to purchase other parts.

Sorry to hear about your troubles when trying to install the end link bushings. I would try using a spray lubricant to help remove the small bushings that are pressed in place. You could also try using clippers or a sharp tool to cut out and remove the old hardened bushings.
-- Etrailer Expert Andrew N - 10/18/2022


Poly bushings are the only way to go. Installation is fairly simple when replacing your worn, cracked, or missing factory rubber bushings.

2008 Ford F-53

The item came exactly when it was scheduled. The installation was simple, thanks to the great How-To video produced by etrailer. I’m a huge fan of etrailer and have shopped them almost exclusively since buying my RV. I’ll be back I’m sure.


Great service, the part arrived quickly and when they said it would. They even followed up after the sale just to make sure it was a good customer experience.


Have not installed but parts look good


Great product


Perfect replacement clamps and hardware for factory installed rear sway bar. If your clamps are missing or the bushings are worn this is all you need. Fast shipment as well.


Could only use the largest two as the others did not fit. Those two did a great job.

Sold my Motorhome. New owner was impressed with ride due to products received from etrailer. Got max for RV. Thanks
William - 12/03/2022


Ordered this kit to replace OEM bushings that failed.....


Whenever we purchase from you it is as expected and delivered on time. Really helped our motorhome with the anti sway added. Worth it for sure.


I thought you sent the wrong parts, but you sent other parts for different sway bar. So ignore the 1st. Email I sent with pictures. It 97° outside. I'll change them in morning. Thanks!


Easy replacement and seems superior to factory OEM.

2012 Ford F-53

The kit worked great. Went together with no issues. I would recommend this kit. I installed it on a 2012 Monaco Monarch.


Excellent fit easy to install


Parts arrived earlier than expected. Included additional parts and hardware not required for my application. Install time was just shy of 20 minutes start to finish. Did the job... Back on the road. Thanks etrailer.


Ordered sway bar bushings on Tuesday got them on Thursday put them in Friday and went on a weekend trip Saturday. Got what I needed, got it fast. Thanks etrailer!


Easy to install and did seem to improve handling.


Fairly easy to put on. Can't say that I notice an improvement in the ride or swaying of our motor home, but at least I have new bushing on the coach.


Made a world of difference

2006 Ford F-53

Very fast delivery. Product has not been installed yet on RV’s rear sway bar, but looks as though it will work and improve the RV’s handling.


Great product..high quality replacement parts for motor home


Good online service


They fit perfectly, install was a breeze. If my front ones go, I'll be coming back to get them here.


Works as advertised!


Ashley, Amazed you had the part I needed and only two days shipping time and a great price.
My Motorcoach is 15 years old. I'll be installing them in the morning then I'm back on the road.
If I could, I'd give you 10 Stars.
Excellent, customer service.
Thank you etrailer is going in my contact list.

Show More Reviews

See what our Experts say about this Roadmaster Accessories and Parts

  • Does Roadmaster Polyurethane Bushing Kit RM-4139-300 Fit 2014 Ford F-53
    For a motorhome built on a 2014 Ford F-53 chassis the Roadmaster bushing kit part # RM-4139-300 that you referenced is a confirmed fit.
    view full answer...
  • Distance Between Bushing Bracket Mounting Holes Roadmaster Bushing Kit # RM-4139-300
    The distance on center between the bracket mounting holes of the Roadmaster Polyurethane Bushing Kit # RM-4139-300 that you referenced is 4-1/8 inches.
    view full answer...
  • Torque Specs for Roadmaster Bushing Kit # RM-4139-300
    I spoke with my contact at Roadmaster regarding any torque specs when installing the Bushing Kit # RM-4139-300 that you referenced. He said that for the bushings themselves there isn't a recommended torque spec because you really just want to tighten them enough so that the bushing is being squeezed a bit. Overtightening can cause damage so you want to be careful. For the saddle brackets it will depend on what size bolt you are using. For a 10mm bolt they recommend 37 foot pounds of torque...
    view full answer...
  • Does Roadmaster Bushing Kit # RM-1139-300 Fit 2019 Ford F-53
    Yes, since your 2019 Ford F-53 motorhome has a sway bar with a 1-3/8 inch diameter the bushing kit part # RM-4139-300 would fit.
    view full answer...
  • Replacement Sway Bar Bushing for 2013 Winnebago Sightseer on a 22K LB F53 Chassis
    Thank you for info on your RV. Based on that the correct bushing replacement you need is the Roadmaster part # RM-4139-300 that you referenced. You do have a 1-3/8 inch diameter sway bar.
    view full answer...
  • Replacement Poly Bushings for Rear Anti-Sway Bar on a 2011 Tiffin Allegro on a Ford F-550 Chassis
    Rear poly bushing kit # RM-4139-125 is indeed a fit for your 2011 Tiffin Allegro built on a Ford F-550 chassis. Roadmaster notes that some of the endlink parts may not be used in the installation and that the fit assumes a 1-1/2 inch OEM bar. Your bar at 1-27/64 inches (1.42 inches) is very close but ultimately too small for a proper fit and you will need a different option. The other option is # RM-4139-300 for a 1-3/8 inch diameter bar. This is actually closer to the 1.42 inch bar...
    view full answer...
  • Replacement Bushing for Rear Sway Bar of 2007 Fleetwood Bounder 33R
    We do have replacement bushing and mount kits that fit your 2007 Fleetwood Bounder 33R for the rear sway bar but it depends on what the diameter of your factory bar is. If the diameter is 1-3/8 inch you'd want the part # RM-4139-300 or if it's 1-1/2 inch # RM-4139-125. Since there's no way for us to know which diameter bar you have now you'll have to run out and measure to determine what you'd need.
    view full answer...
  • Correct 2009 Class A Newmar Canyon Star RV Rear Sway Bar Bushing Replacement Kit
    To replace/upgrade the bushings on the rear factory sway bar of your 2009 Class A Newmar Canyon Star RV you need one of the following Roadmaster kits based on the diameter of your factory sway bar: - 1-3/8" Diameter # RM-4139-300 - 1-1/2" Diameter # RM-4139-125 These are going to be a nice upgrade to what you currently have.
    view full answer...
  • Anti-Sway Bar Bushings For 2005 Ford F-550 Chassis Class A Motorhome
    We do have bushing kits for the OEM anti-sway bar on your Sea Breeze built on a 2005 Ford F-550 chassis, and the bushings include the brackets as well. There are different bushings depending on the diameter of your anti-sway bar, so you will need to measure it to ensure you get the right kit, and I'll list out the options for you: - Rear 1-1/2" Diameter Bar: Roadmaster Polyurethane Bushing Kit for 1-1/2" Diameter, Factory Rear Anti-Sway Bar # RM-4139-125 - Rear 1-3/8" Diameter Bar: Roadmaster...
    view full answer...
  • Replacement Anti-Sway Bar Bushings for Motorhome On Ford F-53 Chassis
    In order to replace just the factory anti-sway bar bushings on a Ford F-53 Chassis you have a few options which will be based on the location of the anti-sway bar (front/rear) and the gross vehicle weight rating of the coach (15,700 lbs, 16,000 lbs etc.) or diameter of the factory sway bar (1-1/2", 1-3/8", or 1-5/8"). If you need bushings for a front anti-sway bar and it is 1-5/8" diameter then you can use the Roadmaster Polyurethane Bushing Kit part # RM-4139-127 but if you need bushings...
    view full answer...
  • Replacement Sway Bar Bushings For Factory Sway Bars On 2003 Tiffin Allegro With Ford F-53 Chassis
    You will need to confirm if you have a 1-3/8" or 1-1/2" diameter rear sway bar on your 2003 Tiffin Allegro RV motorhome with the Ford F-53 chassis. The Roadmaster Polyurethane Bushing Kit # RM-4139-300 will upgrade you to polyurethane bushings for a 1-3/8" bar while the Kit # RM-4139-125 fits the 1-1/2" sway bar. We do also have the Kit # RM-4139-127 if you would like to change the front bushings as well. Or you can upgrade the front sway bar to the Roadmaster Front Anti-Sway Bar # RM-1139-148...
    view full answer...
  • Sway Bar Bushing Kits For a 2016 Coachmen Mirada 35LS on a Ford F53 Chassis
    For your 2016 Coachmen Mirada 35LS on a Ford F53 chassis we offer 2 different rear factory sway bar bushing kits. The Kit # RM88FR will fit a factory sway bar 1-1/2" in diameter while the Kit # RM-4139-300 is for a 1-3/8" factory sway bar. Both kits include the bushings, u-clamps and hardware. We have a matching Front Kit # RM-4139-127 for a 1-5/8" factory sway bar if you wish to upgrade those as well.
    view full answer...
  • 2014 Winnebago Vista35F 22k GVWR F53 Sway Bar Brackets and Bushings
    The stock rear bar of your 2014 Winnebago Vista built on a Ford 22k chassis has a 1-3/8inch diameter which we have a kit for all new brackets and bushings with the part # RM-4139-300.
    view full answer...
  • Which Sway Bar Bushing Replacement for Rear Bar of 2017 Thor Miramar 34.2
    For a motorhome built on a 2016 Ford F-53 chassis with a 26k GVWR the correct bushing kit for the rear sway bar is the part # RM88FR which has a 1-1/2 inch diameter.
    view full answer...
  • Suspension Enhancement for Itasca RV on 2014 Ford F-53 Chassis
    I recommend having your suspension checked out to make sure there are no issues, but if everything is fine, suspension enhancement springs would help level your Itasca. I could not guarantee this will "fix" your lean but the SumoSprings Maxim Custom Helper Springs # SSR-187-54-1 are designed to help keep your RV level and minimize sway. These springs are for 2-wheel drive models - as each of the available springs we offer are - with a GVWR between 20,000 and 26,000 lbs. As for the bushings,...
    view full answer...
    Image 1 for
  • Replacement Bushings 2007 Four Winds Hurricane On 2006 Ford 53 Chassis
    Depending on the diameter of your existing bushings the Roadmaster Polyurethane Bushing Kit for 1 5/8 inch diameter # RM-4139-127 may fit. We also offer a few other sizes to choose from. Rear 1 1/2 inch Diameter Bar: Roadmaster Polyurethane Bushing Kit for 1 1/2 inch Diameter, Factory Rear Anti-Sway Bar # RM-4139-125 Rear 1 3/8 inch Diameter Bar: Roadmaster Polyurethane Bushing Kit for 1 3/8 Diameter, Factory Rear Anti-Sway Bar # RM-4139-300 We also have Replacement Split Bushing for...
    view full answer...
  • 2018 Forest River FR3 32DS Anti-Sway Bar Bushings and Replacement Sway Bars
    I would be happy to help you find those parts for your 2018 Forest River FR3 Motorhome. We have 3 different OEM bushing kits depending on which size sway bar your Motorhome came with. The first is the Roadmaster Polyurethane Bushing Kit for 1-3/8" Diameter, Factory Rear Anti-Sway item # RM-4139-300. This is for the 1 3/8" OEM rear anti-sway bar. The second is the Roadmaster Polyurethane Bushing Kit for 1-1/2" Diameter, Factory Rear Anti-Sway Bar item # RM88FR. This is for the 1 1/2"...
    view full answer...
  • Roadmaster Vehicle Sway Bar and Steering Stabilizer Recommendation for 2019 Winnebago Intent 31P
    Your 2019 Winnebago Intent 31P is built on a Ford F53 Chassis and based on the GVWR of 18,000 lbs I will make my recommendation for the correct front and rear anti-sway bar as well as the steering stabilizer below: # RM-1139-148 - Intended to replace an 1-3/4 inch diameter OEM front sway bar # RM-4139-125 - Intended to replace an 1-1/2 OEM rear sway bar OR # RM-4139-300 - Intended to replace an 1-3/8 OEM rear sway bar Note that some of the endlink parts may not be used when installing...
    view full answer...
  • What is the Difference Between the Different Color SumoSprings for the 2019 Coachman Mirada 32SS.
    You are correct that the different colors on the SumoSprings Custom Helper Springs like the # SSR-187-54-1 note the different densities of the springs; the yellow springs that you were looking at and are mentioned above are the stiffest compression strength springs available for your 2020 Coachman Mirada 32SS and are the best choice to help reduce the side-to-side sway you're experiencing. For reference, the blue SumoSprings are for light duty applications, the black are designed for...
    view full answer...
  • Sway Bar and SumoSpring Kit Recommendation for 2016 Ford F-53 Thor Outlaw
    For your 2016 Thor Outlaw 37LS that has a 26,000 lb GVWR the only solutions we have would be a front sway bar part # RM-1139-148 and for the rear bar a new bushing kit with part # RM-4139-300. Everything else we don't have options for since they exclude the Thor Outlaw models. For rear suspension enhancement though we have the SumoSprings kit part # SSR-187-54-1 which would be a really great option to improve handling and stability. With all three of these installed you would see a big...
    view full answer...
  • Sway Bars and Steering Stabilizer Recommendation for 2015 Fleetwood Storm
    The biggest improvement you'll make the stability, handling and ride quality of your 2015 Fleetwood Storm with an 18,000 GVWR is with a rear sway bar part # RM-1139-146 which works with the stock sway bar to make a drastic improvement. For a bushing kit for your factory bar you'd want the part # RM-4139-300. Next biggest improvement you'll make is with a new front sway bar part # RM-1139-148 which replaces the factory front sway bar. Following that I would highly recommend a steering...
    view full answer...
  • Recommended Replacement Bushings For A Roadmaster RM-4139-300 Kit
    I will start off by saying that the Replacement Bushing # RM-205381-00 is the direct replacement for the Roadmaster Polyurethane Bushing Kit for 1-3/8" Diameter, Factory Rear Anti-Sway # RM-4139-300. To further that, the Replacement Polyurethane Hat Bushing # RM-205223-00 and Replacement Bushing # RM-205219-10 will also be direct replacements for this kit. As to the measurements, the # RM-205393-00 will measure .62" thick and have a 1.28" outer diameter and .43" inner diameter. The # RM-205381-00...
    view full answer...
    Image 1 for
  • Recommended Rear Sway Bar For A 2005 Monaco Monarch On A Ford F53 Chassis
    Though we cannot see your cart, I can definitely tell you that if you are getting a lot of issues with sway and or body roll, I recommend going with the Roadmaster Rear Anti-Sway Bar # 1139-144. This is 1-3/4" thick 4140 chromoly steel for superior strength that will do a much better job than stock bars. With that said, this actually will not replace the original sway bar and you will keep that installed. So if your older bushings are looking a bit worse for wear, I do recommend getting...
    view full answer...
  • Correct SumoSprings for 2020 Mirada on Ford F-53 Chassis
    The correct SumoSprings that fit your 2020 Coachmen Mirada depends on what the GVWR is for your RV, but don't worry because we have a fit for all 2019 Ford F-53 options so you just need to choose from the list below (and/or let me know what model Mirada you have): Front Axle 16K - 22K - # SSF-170-40-2 24K - 26K - # SSF-173-40-2 Rear Axle 16K - 18K - # SSR-184-40-1 20K - 22K - # SSR-180-54-1 24K - 26K - # SSR-183-54-1 Other upgrades you can add to your Class A RV are front and rear sway...
    view full answer...

Do you have a question about this Accessories and Part?

Info for this part was:

Employee Lindsey S
Written by:
Lindsey S
Employee Jeff D
Installed by:
Jeff D
Employee Jameson C
Expert Research:
Jameson C
Employee Joshua S
Video by:
Joshua S
Employee Dustin K
Video Edited:
Dustin K
Employee Andrew S
Test Fit:
Andrew S
Employee David F
Test Fit:
David F

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