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Roadmaster Polyurethane Bushing Kit for 1-1/2" Diameter, Factory Rear Anti-Sway Bar

Roadmaster Polyurethane Bushing Kit for 1-1/2" Diameter, Factory Rear Anti-Sway Bar

Item # RM-4139-125
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Roadmaster Anti-Sway Bars - RM-4139-125
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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. Call 800-298-8924 to order Roadmaster accessories and parts part number RM-4139-125 or order online at etrailer.com. Free expert support on all Roadmaster products. Guaranteed Lowest Price and Fastest Shipping for Roadmaster Polyurethane Bushing Kit for 1-1/2" Diameter, Factory Rear Anti-Sway Bar. Accessories and Parts reviews from real customers.
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  • Reviews (14)
  • Q & A (14)
  • Videos (4)
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Roadmaster Accessories and Parts - RM-4139-125

  • Anti-Sway Bars
  • Anti-Sway Bar Parts
  • Roadmaster
  • Bushing
  • 1-1/2 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.

4139-125 Roadmaster Bushing Kit for Rear Anti-Sway bar

This Product Fits The Following Vehicles

Video of Roadmaster Polyurethane Bushing Kit for 1-1/2" Diameter, Factory Rear Anti-Sway Bar

Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.

Video Transcript for Roadmaster Anti-Sway Bars RM-4139-125 Review

Speaker 1: Today we're going to take a look at Roadmaster Polyurethane Bushing Kit for 1-1/2" diameter factory rear Anti-Sway Bar on a Class A Motor Home. This is a custom fit part. It is designed to fit the 1992 and newer F-550, and F-53 Chassis Class A Motor Homes with either V8 or V10. And because it fits so many different models, I do recommend for you to go to our website, use our fit guide, put in your year and model vehicle, and it'll show you if this'll work for your application.Now, these are replacement bushings that'll work with your factory rear Anti-Sway Bar to improve the overall stability on you vehicle. The flexible design of the polyurethane keeps your Anti-Sway system from being too rigid, and polyurethane is very durable and resistant to damage that can be caused by oil, gasoline, and ozone. So less wear will mean less give in you Anti-Sway system and better support.This part number will include everything laid out here on the table.

The two split polyurethane bushings, right here with the metal saddle brackets. The four polyurethane bushings and sleeves. The four polyurethane grommets. The four large washers. Four small washers, and then the eight bolts.

Even a container of Aqua Lube Grease that you'll want to install onto the bushings when you install these to your vehicle. A nice set of detailed instructions that'll describe how to install everything. These parts are made in the USA.That should do it for review on the Roadmaster Polyurethane Bushing Kit for 1-1/2" diameter factory rear Anti-Sway Bar on Class A Motor Home.

Customer Reviews

Roadmaster Polyurethane Bushing Kit for 1-1/2" Diameter, Factory Rear Anti-Sway Bar - RM-4139-125

Average Customer Rating:  4.9 out of 5 stars   (14 Customer Reviews)

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

- RM-4139-125
2016 Newmar Bay Star Motorhome

Product is great but make sure you get the correct size. This is for a 1 1/2" rear sway bar. Don't trust the fitting guide. Even though I have a 22K chassis, my sway bar is 1 3/8". Fortunately, Roadmaster has excellent customer service and fixed everything for no charge. 726220

When looking at replacement sway bar parts, it is important to double check both the coachs GVWR as well as the diameter of the rear sway bar. Our fit guide lists 3 different replacement bushing options for the 2016 Newmar Bay Star 22,000 lb GVWR: 1-1/2 inch kit # RM-4139-125
Roadmaster Polyurethane Bushing Kit for 1-1/2" Diameter, Factory Rear Anti-Sway Bar
, 1-3/8 inch kit # RM-4139-300
Roadmaster Polyurethane Bushing Kit for 1-3/8" Diameter, Factory Rear Anti-Sway
, and 1-5/8 inch kit # RM-4139-127
Roadmaster Polyurethane Bushing Kit for 1-5/8" Diameter, Factory Front Anti-Sway Bar
. I have also linked the sway bar fit guide for your motor home.
-- Victoria B - 11/25/2019


- RM-4139-125
1994 Ford F-53

The sway bar assembly and overload spring items for my F53 rv arrived as scheduled. All parts were packed well, so there was no shipping damage. Very pleased with products, and instructions were easy to follow. Have already installed new sway bar system, front and rear spring overloads. While installing new sway bar system, noticed factory swag bar needed new bushings. Ordered them from etrailer, and they arrived in a week. Very pleased and would recommend etrailer to friends. 253482

- RM-4139-125

Great product. My Motorhome was extremely loose from side to side or had a roll over effect traveling down the road. These bushings corrected my issue and I’m very satisfied with this product. 706912

- RM-4139-125

Good price and arrived in plenty of time. Thanks 613532

- RM-4139-125
2008 Tiffin Allegro Motorhome

I received the Roadmaster anti-sway bar bushing replacement kit in record time (3 days). I will have it installed after Thanksgiving. I will report any problems in installation. The instructions and diagrams were very helpful. Thank you. 583283

- RM-4139-125
2008 Winnebago Vista Motorhome

Delivered in a very timely fashion, and installed easily. Perfect fit, thanks..!! 559900

- RM-4139-125
2002 Ford F-53

excellent product very quick delivery! 495109

- RM-4139-125
2002 Ford F-550 Cab and Chassis

Put bushings on tonight. Was easy to do and work great. Thanks etrailer!! 411095

- RM-4139-125
2007 Ford F-53

On time and product is of good quality and fit 254038

- RM-4139-125

They had the part in stock that no one else had.Check out was a breeze .Super fast shipping had it in two days . 192266

- RM-4139-125

Works like a charm. followed your instructions and it took about 35 minutes. Best money I ever spent THANKS GUYS Warren B 185945

- RM-4139-125
2005 Ford F-53

Product arrived in just a short time and even had new brackets and new bolts, which was great since one of the brackets had been bent and a bolt was missing. Thanks etrailer ! Repairs have been completed and a test drive is scheduled in the next day or two. 177056

- RM-4139-125
1998 Ford F-53

Great quality, easy installation. etrailer gave great technical advice on installation. 147235

- RM-4139-125
1997 National Dolphin

The kit I purchased was exact fit, came with excellent instructions and was shipped in a timely manner. All the parts we needed were included and everything was a perfect fit to replace the worn out OEM rear sway bar bushings on our 1997 National Dolphin RV mounted on the Ford F53 chassis. Thanks to all the etrailer.com representatives for the ease of ordering, exact quote for delivery, and for stocking the kit I needed 94489


Ask the Experts about this Roadmaster Accessories and Parts

  • Installation Instructions for part # RM-4139-125
    I apologize for the issue with the instructions link. I attached pictures that I took from the installation instructions that will show you how it installs.
    view full answer...
  • Does Roadmaster Bushing Kit # RM-4139-125 for Ford F53 Include Steel U-Brackets
    The Roadmaster Polyurethane Bushing Kit for 1-1/2-Inch Diameter Factory Rear Anti-Sway Bar, part # RM-4139-125, includes two polyurethane bushings, steel U-shaped brackets plus a bag of installation hardware. If you refer to the linked photo that shows a complete sway bar kit you will see two arrows indicating a pair of bushings with the steel U-brackets. Two of these are included in the replacement kit along with the bushings and hardware.
    view full answer...
  • What is the Rear Sway Bar Size of a 2002 Ford F-53
    The only way to know if the Roadmaster Polyurethane Bushing Kit for 1-1/2" Diameter, Factory Rear Anti-Sway Bar # RM-4139-125 will fit the rear sway bar on your 2002 Ford F-53 chassis is for you to measure them using a Digital Caliper, like part # PTW80157. Since different RV manufacturers will install their own preferred equipment on any given chassis you have a much more guarantee of a fit if you can check the measurement physically.
    view full answer...
  • Installation Instructions for Roadmaster Sway Bar Bushing Kits for 1997 Ford F-53 V8 Chassis
    I am not sure what is wrong with the links but I have included a picture of the instructions for the rear, # RM-4139-125, and for the front, # RM-4139-127, for your RV built on the 1997 Ford F-53. V8 chassis. The rear is on the top and the front is on the bottom.
    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...
    view full answer...
  • Replacement Bushing Kit for Rear Sway Bar of 1998 Santara Couchmen
    Your 1998 Santara Coachmen was built on a Ford F-53 chassis so the # RM-4139-125 that you referenced would be the correct rear bushing kit for the rear sway bar.
    view full answer...
  • Does Roadmaster Polyurethane Bushing Kit # RM-4139-125 Need Nuts to Install
    Since the bolts that come with the Roadmaster Polyurethane Bushing Kit # RM-4139-125 are designed to attach to threaded parts of the vehicle suspension nuts are not included or needed. Check out the install video I attached for more info on how it installs.
    view full answer...
  • Availability of Anti-Sway Bar Bushing Kit for a 2002 Ford F-350 Super Cab 7.3 Liter Diesel
    You would need to measure the diameter of the sway bar on your 2002 Ford F-350 to find the right bushing kit. Kit # RM-4139-125 is designed for 1-1/2 inch diameter rear anti-sway bars. It is designed to fit dually models, rear axle, with 1-1/2 inch diameter sway bar or the front sway bar on 4-wheel drive models. Kit # RM-1139-153 was designed to fit on models that have a factory sway bar but excludes dually models. We do have pictures on the product page for this kit. We also have...
    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...
  • Rear Factory Anti-Sway Bar Bushing Upgrade for 1999 Fleetwood Bounder 34v on Ford F53 Chassis
    I did some checking on your 1999 Fleetwood Bounder 34v and it appears that it was built on the Ford F53 chassis which is a common one for Class A RVs. There is a bushing upgrade kit for the rear anti-sway bar and it is # RM-4139-125. The single bushing # RM-205217-10 may not work in the factory mounts by itself which is why I recommend going with the whole kit.
    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...
  • Front Axle Stabilizer for a 1999 Fourwinds Infinity on a Ford F53 Chassis
    Blue Ox does make a great product but Roadmaster's stuff works well so I would go with it, save some money, and maybe look into putting some of that back into stabilizing the rear end as well. So for the front axle use the Roadmaster TruTrac, # RM-TRACV-10B. For the rear you can upgrade the factory sway-bar bushings with kit # RM-4139-125. Upgrading just the bushings will also help provide a more stable ride compared to the stock bushings. I have included a link to our help article...
    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-1139-140 - 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...
  • 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...
    view full answer...

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Info for this part was:

Written by:
Lindsey S
Expert Research:
Michael H
Expert Research:
Jameson C
Expert Research:
Adam R
Expert Research:
Jeffrey L
Installed by:
Jeff D
Video Edited:
Jacob T
Updated by:
Adele M
Video by:
Dustin K
Test Fit:
David F

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