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RAS

Original (RAS®) RoadActive Suspension 3611-YHD | Fits Ford F150 4WD 2009-2025

  • Based on 210 reviews
Condition: New
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Availability: Only 3 left in stock, order soon!
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Arrives Monday, Sep 21
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Features

  • (RAS) RoadActive Suspension HD Rear Leaf Spring Upgrade U.S. Company, Original Product built by the original creators of RoadActive Suspension system, this rear leaf spring upgrade comes from a North Carolina based company with a track record of durability and performance since 1998. Engineered and assembled with a focus on quality and reliability. Look for the RAS trademark to ensure you're getting the authentic, original product.
  • Reduces Squat & Bounce Strengthens rear leaf springs by up to 50%, providing improved load support and control when towing or haulingwithout compromising ride height.
  • Smooth Ride, Loaded or Empty Maintains superior ride quality and vehicle stability in all conditionsunlike airbags or stiff jounce-style alternatives that affect everyday comfort.
  • No Maintenance. No Adjustments. No Air Lines. Installs in as little as 45 minutes and begins working immediately with zero upkeepideal for drivers who want performance without the hassle.
  • Proven, Tested, and Built to Last Designed and tested for heavy-duty use on the road and off. Trusted by hundreds of thousands for its unmatched reliability, safety, and long-term durability.
  • 3-in-1 Suspension Upgrade Functions as a helper spring, sway bar, and traction bar in a single, cost-effective solution

Description

Gain critical strength and stability, when you need. Most popular kits install in as little as 45 minutes and require no readjustments. Using high quality components proven to last, pickup owners enjoy the seamless blend of improved load handling, performance, ride quality and enhanced overall performance at all times. Are there counterfeit or knockoff versions of RoadActive Suspension kits? Beware of imitation kits sold online. Only genuine RoadActive Suspension products have been engineered, tested, and warrantied in North Carolina since 1998. Listings with RAS in the title are genuine RoadActive Suspension products. How much does RAS increase payload capacity? While RAS can strengthen the rear suspension by up to 50% in a progressive manner and can improve the way your truck handles loads; it and no other suspension upgrade can increase the manufacturer weight ratings. Will RAS fit my lifted truck? From a fitment standpoint, RAS often fits lifted trucks without an issue. Before ordering for your lifted truck, be sure to check your suspension for possible obstructions. If there appears to be an issue please contact RAS directly for assistance. Will RAS help reduce my rear squat? Yes! While RAS is geared towards improving overall load handling, stability, and performance without hassle; RAS will also help reduce rear squat by up to 2-3 inches. How is RAS different from other suspension helpers such as air bags? RAS offers a more complete solution, where enhancing stability, reducing rear squat, dampening excessive rebound, improving performance, and providing same-as or better-than-stock ride is just as important as reducing rear squat. Will shares how RoadActive Suspension helped improve his towing and ride quality with a simple driveway install. Claude pushes his 1/2 ton truck to the limit and shares how RAS helped. Josh's daily driver experienced bounce, squat and instability while towing his boat and trailer. He shares how RAS helped improve the towing experience. Broderick carries extra weight in the back and often uses his Tacoma for camping. He shares how RAS improved his off-roading experience with this fit-and-forget install. Chad loads his Tundra for his business everyday. He was thinking about adding airbags, but came across RoadActive Suspension. He shares why it worked best for him Travis uses his 1500 for work and play. He was initially considering air bag helpers, but found RAS and shares his impressions.

Brand: RAS


Auto Part Position: Rear


Included Components: Leaf Spring


Maximum Lifting Height: 3 inches


Manufacturer: RoadActive Suspension


Brand Name: RAS


Included Components: Leaf Spring


Manufacturer: RoadActive Suspension


Automotive Fit Type: Vehicle Specific Fit


Model Number: 3611-YHD


Manufacturer Part Number: 3611-YHD


Manufacturer Warranty Description: 5 Year Manufacturer Warranty


Auto Part Position: Rear


Maximum Lifting Height: 3 inches


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Monday, Sep 21

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

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Top Amazon Reviews

    • A major difference on F150.
2019 Whippled F150 5.0L. Bilstein 5100 shocks all 4 wheels. Truck sat level pre Roadmaster. I purchased the HD version. Installation was a breeze. Took about 2 hours taking my time. Wow! My truck rides so much nicer and gained 1.5 inches of lift in the rear set with black disc. I like the little rake it brought back to the truck. With this system I can barely tell my 26 foot, 5000lb travel trailer is on the back. No sway, bumps are one and done, no bouncing. It made the ride and handling about 50% better all the way around. Best of all no hop and zero axle wrap when I launch it. The truck hooks right up! Imo these work better than traction bars without sacrificing ground clearance. For 550 bucks this took care of all my issues I wanted to solve. Only con was my hands got dirty. Get long jack stands if you don't have them. Oh USA made and 3 year warranty too! Just get them and you'll be very happy. ... show more
Reviewed in the United States on May 16, 2022 by NalaGrace
    • Great Product
Installed on a 2016 F-150 SuperCrew 4x4. I was concerned these springs would be too hard and create a jarring ride. I was wrong, way wrong. Stability is improved and the truck feels more planted. Not harsh or jarring at all. I tow a 7000 lb. travel trailer, with an Andersen WDH. The ride quality is very nice and the truck and trailer are level. I was considering Sumo Springs, Tembrens, AirLift and Firestone air bags when I came across the RAS spring kit. I am SO glad that I chose RAS. I have the RAS springs set with the white 1 mm disc. My truck has a 200 lb. cab-high shell and a 100 lb. generator when travelling. The RAS kit raised the height at the hitch 7/8" (22 mm). I like the RAS over the others because it's active all the time with no adjustments or maintenance. I figured the bump-stop replacements when engaged would feel like riding on (wait for it) bump stops. I've had air bags on other vehicles and though they ride nice and serve their purpose, they do wear out and require my attention to monitor pressure. I'm very happy with the RAS Active Suspension kit. ... show more
Reviewed in the United States on May 10, 2023 by Eric Klock
    • Made a difference
Review Image by JimE
Review Image by JimE
My 2021 F150 didn't like towing my 27' travel trailer. Had more sag, even with weight distribution system, than I liked. Got these hoping to get more lift and support in the rear end of the truck. Installation was pretty straight forward ONCE I figured out how to unscrew them to make them fit correctly. For a bit there, I was getting worried that I ordered the wrong ones, but a little Google showed me where I was missing the unscrewing. To fit them in the box, the factory way screws them down, and you have to open them up all the way by loosing the threads. Now, results after the 30 minute installation....towed like a champ! Back end with trailer, RAS, and weight distribution was back to even and kept the steering and suspension feeling right. Without the trailer there is a little more bounce than before, but after a few days I adjusted to it and don't even notice it. I actually like the lift stance it gave the truck. And who knows, I was probably used to a soft ride and this is probably how a 150FX should feel. Overall, this was the best investment for my peace while towing, and truly made me feel more in control than before. Well built product and glad I did the authentic RAS and not a knockoff. Do yourself a favor if in doubt about your tow capacity and comfort....install these. ... show more
Reviewed in the United States on December 12, 2025 by JimE
    • Worth its weight in gold!
WOW! Believe every word of the hype. My 2016 F150 felt a little bouncy with a full bed, wasn’t really over the top but I carry a decent amount of tools and boxes back there so it was always a little unsettled. My tools are just heavy enough that it took the rake out of the truck and made it ride really rough over uneven surfaces or bumps. The RAS sorted it out perfectly. I used the black disc assuming it would be best because I always have weight in the bed. It takes a second to get used to, but that’s honestly because of how strangely smooth it rides. It’s very obviously still a truck, don’t get me wrong, but it fixed the ride height and really settled the rear end down. Took about 2 hours but that’s with me basing it off videos I’d watched weeks ago and setting one of the brackets to the wrong hole initially. Use the 3rd one from the end, otherwise the spring will rub against the rebound clip. Otherwise it was a breeze. For my 2016, the bump stop spacer/relocation puck didn’t have roll pins in it, but it sat flush and tightened down nicely, I see no problem with it because you’d really be doing something silly if you ended up on the bump stops with this kit installed anyway…. Worth every cent! Don’t buy the fakes. These springs are under a LOT of tension, do not chance it. Those Chinese fakes will break, violently. ... show more
Reviewed in the United States on August 3, 2025 by WHBFD619
    • Great product
Easy installation! Raised my truck 1.5 inches. I have a 2019 ford 3.5 eco boost. Pulling a 2025 1/2 ton 100 series grand design fifth wheel. Roughly 1100 pound hitch weight. Squats truck back to original height. Ride I feel is better when no load. No wheel hop over rough surfaces. But definitely more rigged.Better than air bags! No air compressor to air up or taking air out.Bags bouncer with no load! ... show more
Reviewed in the United States on October 18, 2025 by John James Dietrich
    • RDS suspension
Installation was a breeze. Hauling 10k with an F150 can be sketchy, RDS sucks up the weigh and the truck hauls the weight and stays level without losing gas mileage
Reviewed in the United States on August 13, 2022 by BRYAN WEBB
    • Don't expect any kind of support!
I do think the product is a great product and it does perform as expected or advertised on my F-150. The ride is actually better with this on than without! I installed the product wrong and damaged the threaded rod. The company won't sell me the part that I damaged. They claim because of some sort of liability. It's bs, I damaged the threads on the rod and now what I'm supposed to buy another $600 kit??? It's an easily replaceable part and the fact that they won't just sell it to me is ridiculous!!! Seems like it was a misunderstanding in an email and the company is working on it. I'll update this if it goes south. ... show more
Reviewed in the United States on November 3, 2025 by Matt T
    • So far so good!
Review Image by RCK
Review Image by RCK
Install my 2023, 150 lariat. Increased Hitch hight the back of the truck, two inches. On minimal setting., loose. For towing my boat. And help with normal everyday bumps. Streets are terrible in Denver. Seems to handle the bumps and potholes better. And curb jumps. Ride feels smoother. Hoping it takes away the highway expansion joint jumps, and the warnout concrete vibration. I tried the Rancho nine stage shocks. Took them off and threw him in the trash. Put the old shocks back on. This seems to be the best effect so far for normal driving. Handles well. Highway rough cement and expansion joints. Hardly noticeable. ... show more
Reviewed in the United States on January 4, 2025 by RCK

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