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If your rig tends to lean hard in turns or rock when getting passed by big trucks, this 1-1/2" diameter rear anti-sway bar makes a big difference. It ties the rear axle to the chassis so weight shifts stay balanced through curves, crosswinds, and uneven roads. The thick 4140 chromoly steel resists twist and flex to keep the ride level and controlled. You’ll notice tighter handling and a more planted feel on every stretch of highway.

A setup this solid starts with materials that don’t quit. The bar is made from 4140 chromoly steel—much stronger than standard 1020 steel—and its larger diameter gives it nearly 30% better resistance to sway. Polyurethane bushings replace soft rubber so there’s less give and more consistent support. They also hold up against oil, gasoline, and ozone for long-term durability.

Keeping your vehicle steady in crosswinds or when towing a heavy load takes work. This anti-sway system cuts out side-to-side movement so you’re not constantly correcting the wheel. The result is a smoother, more predictable drive with less strain and fatigue, whether you’re cruising through open country or dealing with shifting cargo.
Installing extra stability shouldn’t be a hassle. This kit comes with heavy-gauge mounting hardware and bushing lubricant, and it bolts directly to the rear axle and frame—no drilling needed. It’s designed to work around most suspension add-ons, so you can dial in better handling without reworking your setup.
Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.
Hi everybody, Andy here with etrailer.com, and today, we're gonna take a look at this Roadmaster Rear Anti-Sway Bar. Now, this bar is going to mount to the rear axle and to the frame of your vehicle to help minimize side to side movement, improving the overall stability of your vehicle. This system is going to let you execute turns and quick maneuvers with confidence, providing a level ride even on irregular surfaces, and reducing driver fatigue by minimizing the effort required to keep your vehicle in line. It's also going to help diminish the effects of crosswinds, passing motorists, and shifting cargo. Now, this anti-sway bar does for side to side movement what a good pair of shocks does for up and down motion, giving you a marked improvement in your vehicle stability. So this is designed to fit the 2010 to 2013 GMC Sierra and Chevrolet Silverado 1500, 2500, and 3500, and then the 2014 to 2018 GMC Sierra and Chevrolet Silverado 1500, and then the 2014 to 2019 GMC Sierra and Chevrolet Silverado 2500 and 3500, and then finally, the 2019 GMC Sierra 1500 Limited and Chevrolet Silverado 1500 LD.
So this will work in conjunction with your Sierra's or Silverado's suspension system. It has been engineered to avoid interference with most popular aftermarket add-ons and accessories, and the diameter of this bar is 1 1/2 inches, and it is made here in the USA of 4140 chromoly steel for superior strength. This is also made with polyurethane bushings instead of your standard rubber variety for a longer lasting system. In case you don't know, polyurethane is durable and resistant to damage that's caused by oils, gasoline, and ozone, so less wear means less give in the system and overall better support. This includes heavy-gauge mounting hardware, and also, easy to follow instructions and even a little container of bushing lubricant.
This does have a limited lifetime warranty. And I do wanna point out that the bar itself is heavy, it has a really good weight to it, so I just wanted to make you aware of that, it might be a good idea to have someone help you install this just because of the weight of the bar. I don't consider myself strong by any stretch of the imagination, but it does take a little bit of effort for me to lift this off the table, so I just wanted you to be aware of that. Well, that's gonna conclude our look today, I do hope that it was helpful for you. Again, my name is Andy, thank you for joining me.
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Customer Satisfaction Score:
97% were satisfied with this product
3% of customers were not satisfied
Ratings & Reviews

Matthew
10/7/2026
This is a complete game changer when using a truck camper Mine is an Arctic Fox 990. I would list this under a must have accessory when using a truck camper. Unloaded ride when you hit off camber bumps is slightly rougher, but hey its a Ram 3500 dually for hauling heavy stuff. Also the performance when carving twisty canyons with an empty truck is astonishing....Watch out Corvetts, here I come!


Fred
8/15/2026
Excellent it works great


Gwendolyn Y.
4/8/2025
No more white knuckling! That's awesome to hear, Kris. I'm glad that this bar helped so much so you can have a more relaxed drive :)

Kris
3/17/2026
I have taken a few trips with the Clatter Cabin now. It’s been enjoyable to drive. Since then I have replaced the exhaust from the engine back with 2 12 inch pipe. I was able to get the pre bent exhaust parts over the axle and clear your rear sway bar nicely. Now she purrrrs!

Kate F.
9/24/2025
Install looks great Steven! I can't wait for you to take it out for a spin so you can see the difference for yourself, it is amazing what a upgraded sway bar does to your ride, no more white knuckles for you, or your wife. What big stops do you have planned on your trip to the West Coast?

Ken
8/19/2025
No complaints with the handling. This is a good sway bar!

Jenny N.
6/25/2024
What I recommend is touching it up with a rust resistant paint like Rustoleum. We will be in contact with you about the damage. Please keep an eye on your email.

Leonard
6/22/2025
After a year and many miles I would give it a five star for sure. Made a great improvement over the stock anti-sway bar. With the rear and front RoadMaster anti-sway along with the RoadMaster steering stabilizer the E-450 33 foot class C motorhome drives like a dream. I highly recommend these three products. If not all at once then this order, 1st rear anti sway bar then 2nd front and then the steering stabilizer with the spring on it.

Dan K.
4/22/2026
wondaful! highly recommended.

Gwendolyn Y.
4/28/2025
High-five on the install, Curtis! Also, thanks for sharing all the pictures and showing all the angles of the sway bar. They are really helpful for anyone looking to tackle this install themselves at home!

Brooke M.
6/17/2025
So glad to hear that, Dimitrios! Thanks for including a photo, too.

Michael
3/25/2026
After a year the system is working great. It has made the driving much safer and smoother.

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James D.
5/19/2026
Thanks for your feed back John, Pretty straight forward, glad your install went well. We apologize for the missing hardware, any time you have issues or questions don't hesitate to reach out so we can help. Appreciate you choosing etrailer and again, if you need anything please let us know!