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Availability:
Only 7 left in stock, order soon!
Arrives
Thursday, Oct 16
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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
Brand: RAS
Auto Part Position: Rear
Included Components: Leaf Spring
Maximum Lifting Height: 3 Inches
Manufacturer: RoadActive Suspension
Brand: RAS
Auto Part Position: Rear
Included Components: Leaf Spring
Maximum Lifting Height: 3 Inches
Manufacturer: RoadActive Suspension
Automotive Fit Type: Vehicle Specific Fit
Item Weight: 33.5 pounds
Package Dimensions: 31.2 x 10 x 5.4 inches
Item model number: 3611-YHD
Manufacturer Part Number: 3611-YHD
Date First Available: August 24, 2021
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Thursday, Oct 16
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
Installed on my 17 f150. It's definitely stiffer but not as bad as the helper springs I've tried, it feels sportier. It took out a lot of the squat and feels much more stabile when trailering. It doesn't have the shimmy that it used to have. Not towing it seems to help with the traction and the back end hardly squats under acceleration.
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Reviewed in the United States on March 28, 2025 by Erick
This was a piece of cake to install with a little patience and a couple of hours. We hauled a 25FB Airstream with a 2024 F150 Lariat and didn't have any issues on a 6 hour drive. No dog wag or weird sway at any point. It felt very secure and solid and it kept the truck looking level. I would definitely recommend!
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Reviewed in the United States on March 24, 2025 by Kathryn Copeland
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.
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Reviewed in the United States on January 4, 2025 by RCK RCK
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
They do seem to help with Bunnyhop, on washboard Roads. They do help a little with side to side sway with my 2000 pound camper. If you have airbags, you may have to do some modification of The mounts which hold the airbags. That can be a lot of fun. Overall seems like a good product, and it’s made fairly beefy, easy to adjust.
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Reviewed in the United States on October 15, 2024 by dave
OK bit of a dIY guy I've replaced full spring packs to just adding the hellwing helper spring track bars and half springs this is a great combination of everything the axel and frame are what determines your load compasity so doesn't raise that but on my 2019 f150 at 75 ish I had a lot of body sway to the point it felt like the truck would roll, had a bit of axel wrap and I occasionally have to move 1800lb directly in the bed the body sway and axel wrap went away without replacing springs or shocks and so did the axel wrap and with 1800lb in the back went from the top of the tires in the wheel well to about 3 Inches above the tire and on the highway truck felt in control of the load no big difference between loaded and unloaded
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Reviewed in the United States on August 4, 2024 by mitchell
Have seen numerous references to the mysterious "RAS" on several F150 forums- I tow a 6000# travel trailer, the truck does an excellent job pulling it, but I kept experiencing "porpoising" of the trailer following subtle highway undulations. Spent about 45 minutes installing, and other than raising the rear bumper about an inch and a half, the RAS did not change the empy ride of the truck. Just completed a 750 mile road trip pulling the trailer and I have to say the truck has never felt so planted. Easily self-installed (I'm over 70 yrs old) in under an hour, and in my books, worth every dime. If you own one of the modern "half ton" trucks and tow a trailer occasionally, you need this addition.
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Reviewed in the United States on September 25, 2024 by DoctorPaint
Installed these after a long roadtrip from Texas the Grand Canyon. The added weight from my overlanding gear had my truck squatting pretty bad enough to ruin my front tires. Installed the RAS and got it back to level. Rides great as always and handles the additional weight from my gear perfectly.
Reviewed in the United States on December 28, 2024 by Carlos M