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Few upgrades make as big a difference in control as a solid rear sway bar. The 1-1/2" diameter Roadmaster bar ties the rear axle to the chassis to balance weight transfer and cut down on lean in turns. Built from thick 4140 chromoly steel, it’s considerably harder and stronger than the 1020 steel that comes stock, so it resists flexing and keeps the rig level through curves, quick maneuvers, and uneven surfaces.

That uneasy drift when a semi blows by or a crosswind hits is where this setup shines. By minimizing side-to-side movement, the bar keeps the vehicle planted and centered, reducing the effort it takes to hold your line on long stretches. Less correction at the wheel means less tension in the driver’s seat and a smoother, more predictable ride.
This isn’t a part that gives up over time. The 4140 chromoly steel bar delivers superior torsional stiffness, and the polyurethane bushings outlast standard rubber by resisting wear from oil, gas, and ozone. Less give means more consistent support and better tracking, mile after mile.

The kit includes the mounting hardware, lubricant, and instructions for a direct bolt-on fit. It attaches to the rear axle and chassis with no drilling, working cleanly alongside most popular suspension add-ons or accessories. Once it’s in place, you’ll feel the improvement right away.
Customer Satisfaction Score:
93% were satisfied with this product
7% of customers were not satisfied
Ratings & Reviews

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.
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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!