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Availability:
In Stock.
Arrives
Sunday, Apr 19
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
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
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:
Sunday, Apr 19
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.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
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Top Amazon Reviews
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.
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Reviewed in the United States on May 16, 2022 by NalaGrace
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.
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Reviewed in the United States on August 3, 2025 by WHBFD619
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.
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Reviewed in the United States on December 12, 2025 by JimE
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!
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Reviewed in the United States on October 18, 2025 by John James Dietrich
These work well and are built of quality materials for sure. I just feel like they're a little overpriced for what you get.
Reviewed in the United States on September 13, 2025 by Chad Blea
My 2021 King Ranch PowerBoost has a max payload of 1316 lbs (very low for a new truck) and I needed more assurance towing our 2022 Rockwood Minilite 2509S. Rockwood Minites are notorious for heavy tongue weight (850lbs RAW for a 6360 lbs trailer). I am running an E2 WDH 10,000lb and even though the hitch height is perfectly set (before adjusting the bars and washer), there is quite a bit of read sag, almost to the bottom. Simply put, I needed more assurance for the rear axle weight and support than the 2 leaf springs FORD has decided to move to with their ‘Max Trailer Tow Package’ and #7350 GVWR package. I swapped out the FX4 front and rear shocks for FOX 2.0 Ford Tuned from TC Customs, upgraded the tires (275 60R20) to an E Load tire (295 60R20). Now with my tire PSI set at 60 cold (max is 80), I needed more safety. Enter the RAS. I talked to RAS support and with the YHD they said max space can be set to 2.5mm, or a nickel and a dime thickness, which I did. Install was very easy, the added bump stop relocaters are helpful as well since the 2021 has the auto level headlight sensors on the rear drivers side axle that the RAS would have had issues with for the bump stop. Now loading up my trailer, tongue weight and WDH fully set, my front and rear wheel wells are at 40 1/2 (even) and the front axle has gained 40lbs over unloaded weight. The rear is still holding 600-700lbs but with the RAS I am towing with confidence and control. I am also added Timbren SES in place of the Stock Bump Stop for added towing comfort and control. If you are driving a 2021 F150, I highly recommend you install the RAS even if your towing is light. Loaded and unloaded the driving, comfort and control is vastly improved. Highly recommend 10/10.
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Reviewed in the United States on July 13, 2022 by Dustin Becerril