Ford F-150 (4WD) 2021 -2026 | HD Kit
Ford F-150 (4WD) 2021 -2026 | HD Kit
Ford F-150 (4WD) 2021 -2026 | HD Kit
Ford F-150 (4WD) 2021 -2026 | HD Kit
Ford F-150 (4WD) 2021 -2026 | HD Kit

Ford F-150 (4WD) 2021 -2026 | HD Kit

SKU: 3611-YHD

Regular price$589.00
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Get the best of both worlds with RoadActive Suspension® HD — the only suspension upgrade that strengthens your factory leaf springs by up to 50% while improving unloaded ride quality, handling, and overall control. Unlike suspension upgrades that require constant adjustment, maintenance, or compromise everyday comfort, RAS® HD reduces squat, excessive bounce, sway, and body roll without the hassle of airbags or harsh unloaded ride quality. This fully mechanical 3-in-1 system combines the benefits of a helper spring, sway bar, and traction bar into one simple bolt-on upgrade designed for trucks that tow, haul, and drive loaded regularly. Helps provide: • Up to 50% increase in rear suspension strength • Up to 2" reduction in squat • Improved towing & hauling stability • Reduced sway, bounce, and axle wrap • Same-as or improved unloaded ride quality With a quick 1-hour installation and zero maintenance, RAS® HD is one of the simplest and most effective ways to improve towing, hauling, and everyday driving performance.
Watch Installation Video (2025 Chevy/GMC 1500)
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RoadActive Suspension provides a 30 day money back guarantee, from date of purchase. However should the kit be returned, it must be re packed in the original packaging with all components included. On orders with free shipping (where shipping was paid for by RoadActive Suspension), refunds will reflect the invoiced amount, minus that shipping cost billed to us by our shipping provider. In addition, the customer will be responsible for the return freight charges.

It works with your suspension — not against it.

Each kit is tailored to your specific vehicle

RoadActive Suspension is uniquely assembled for your model and typically ships within 1-2 business days! RoadActive Suspension is the only suspension upgrade on the market that adds strength to your rear suspension, provides same as or better than stock unloaded ride quality and doesn’t require readjustments or maintenance.

Each RAS kit comes fully assembled out of the box and ready for installation. Follow your application guide that is in the box and you will be ready to test your RoadActive Suspension after an installation as simple as 45 minutes! If you are not satisfied with your RoadActive suspension we offer a money back guarantee.

Reduce Rear Squat & Bounce

Improve Stability

Improve Roadhandling & Stability

Make RVing Safer

Reduce Axle Wrap

No Readjustments or Maintenance

We already know what you're going to ask.

No, installing RoadActive Suspension (or any other rear suspension helper) does not automatically void the factory warranty. The Magnuson Moss Act states that it is illegal for a vehicle manufactuer or dealership to void a warranty just because a part has been installed. The manufacturer or dealership may only void the warranty if they are able to prove the aftermarket part caused or contributed damage to the vehicle. Even then, warranty to the impacted component(s) is the only portion of the warranty that may be voided. In this case, all other parts of the vehicle remain under warranty.

RAS uses a variable-rate tension coil spring that attaches directly to your rear leaf springs. It works like a muscle, progressively engaging as load or force is applied. This keeps the leaf springs in an upright bowed position to prevent sag, improve stability, and enhance bounce isolation.

Most applications see a 2–3" reduction in rear squat. The exact amount will depend on multiple factors such as vehicle size, load size, load placement, leaf spring condition, and the tension setting of the RAS.

Expect same-as or better-than-stock unloaded ride with less bounce and more control.

Yes — in as little as 45–60 minutes with jack stands and hand tools. No drilling, no air lines, no maintenance.

Airbags add complexity, cost, and ongoing maintenance. Other helper springs only address sag and can compromise ride comfort.RAS is 3-in-1:it controls squat, reduces sway, and improves traction — all with zero maintenance.

Customer Reviews

Overall rating: 4.8 / 5 from 613 reviews.

I want lie its was a little unsure about ordering the ras system, but then I got it an installed it. About 30 minutes per side with adding bump stop spacers. Then the test i hook up trailer jeep an I got to say it is far better than I was expecting 2in less sag, more stable front an rear felt more planted to the road. Without the trailer i can say the truck overall ride is better if your on the fence try it you want be disappointed

The kit was very easy to install. If you have access to a lift you don’t even need to remove the wheels. Made towing my 33 foot camper safe and easy. I would definitely recommend RAS over airbags.

Easy install, and seems to be doing exactly what I needed it to do. Highly recommend!

I installed the (RAS®) RoadActive Suspension 3611-YHD kit on my 2021 Ford F150 Lariat 4WD truck mainly to provide extra lift and stability while pulling my 32’ bumper pull RV trailer. After a recent camping trip, I am TOTALLY pleased with the result(s)…no more truck “squat” or “porpoising” with added stability! A very wise investment!

Installed this system on my 2022 F150 and towing has improved drastically. This RAS system is a must have.

I couldn't be happier with the performance of the RAS system! The installation was just as easy as advertised and the results are fantastic! The truck feels more stable even when unloaded, and with the trailer hitched up, there is zero sag and the towing experience is FAR better than before. Absolutely a solid 5-star product!!!

2022 ford f-150 it makes a world of difference with my 18 foot car trailer with my sxs . Im hauling 3500 at highway speeds. I love them

I just bought these for my older 2016 F150 and used them to haul my car hauler. No more squat. Still a comfortable ride. I wish I had these all along. I just traded my 2016 off for a new 2023 and transferred them over to it as well. Easy enough. I hauled my car hauler again and got the same great results. Quality product. Worth every $$$$. Tad Shanks. Texas.

2016 Ford F150 with 95,000 miles. Purchased the truck to tow a camper and it was bouncing and being pushed around. Decided to try RAS instead of purchasing new springs and shocks. Made a huge difference and for a lot less money. Easy to install. Tows and rides much better.

I bought the Heavy duty RAS suspension for my 2017 Ford F150 to reduce rear truck sag and improve handling for our 3 week 5500 mile round trip to WY and SD. I was extremely satisfied with increased handling performance while traler was attached through the mountains and 60 mph cross winds. All trailer sag was also eliminated. Noticeable improved handling without trailer also. I would highly recommend this product to others!

After I installed the RAS, I noticed much more stability pulling a 30ft camper, especially going around curves. Felt like the rear end of the truck was much more “planted “. Install was super easy, took about an hour. It did raise the back about 1 inch.

2015 4x4 XLT 2.7 Ecoboost. Makes truck sit and ride better. Smooth pulling my camper, no more squat.

I installed this to reduce suspension squat on my 2023 f150 tremor truck while towing my forest river wildwood fsx 260rt toy hauler camper. It raised my truck 2-3 inches in ba k with no load but definitely reduced suspension squat with the camper in tow. Wish I'd measured the difference. What i didn't expect is it improving the cornering ability of the truck unloaded! It reduced body lean when rounding corners; be aware of this or you may dump.a passengers drink like I did. RAS is a great product!

Easy to install improved ride and handling with a 800 pound tongue weight camper

I’ve got a 2009 F-150 with 145k miles that I purchased new. We started pulling a travel trailer 4 years ago and replaced most of the most key suspension elements to get a better, and safer tow. I added a fiberglass camper shell last year which changed the dynamic since I was adding weight to the bed top causing an exaggerated sway. Fortunately, I reached out to a couple of F-150 forums on FB about this and they universally recommended RAS. The Ford F-150 (4WD) 2009 - 2014 HD Kit I purchased was easy to install and I can already feel the difference. We’ll be going on a camping trip tomorrow and I’ll be able to assess the entire install at work.

I bought this to firm up my 2025 F150 Tremor while towing heavy. So far I’m very happy with the product. Only problem and I knew this was going to happen, I put a 2.5” leveling kit on my Tremor but with the RAS, I’m back up 1.5” using the white adjustment spacer. I knew it was going to and I’m still happy with the look. Another plus, I can be pretty heavy footed in the corners and curves, my truck now has much less roll while cornering. Rear end stays planted similar to using a traction bar. If you purchase a RAS just know that it will lift the rear 1.5 to 2” depending on which setting you decide to adjust to.

Installed these in about 45 minutes without removing the tires. Just made sure to jack truck up far enough to get jack stands under frame instead of front leaf spring holder. Was an immediate improvement of how the truck handles the roads and curves. Rear end is much stiffer than expected or would like even at the lowest adjustment disk (white) but that’s ok. Bridges and rough roads definitely feel more planted and controlled. I haven’t towed anything but I got these for future jobs since I wanted traction bars anyways. Solves the issue of needing traction bars air bags or a sway bar in the rear for handling!!!! Ford F-150 (2WD) 2015 - 2025 HD Kit

Great will tow soon added one inch to rear of my truck

Love it 👍

2023 F150 Tremor

I have been researching numerous suspension options for my 2025 Ford F-150 Platinum Powerboost to safely tow my 2026 Grand Design Imagine 2670K travel trailer and decided that the RAS 3611-YHD kit was the best application. The improved stability and ride are exactly what I was in search of and certainly recommend this product.

So far it’s great. Easy to install and I definitely feel more confident in the ride while towing. No big sways when bouncing. Highly recommend!

This kit was easy to install, fits perfectly, and improved my F-150 ride quality while towing tremendously! Customer service is excellent as well; they offered a military discount and shipping was extremely fast.

I have a 2024 F150 2wd STX. I also live at the end of an 8 mile long dirt road with curves. I loved everything about the truck except when I did the curves on gravel. It had a tendency to slide but not a controled drift. Instead it would start into a slide and then grip and then start to slide again. It did not good. I installed the 3611-BHD and was quite suprised at how much it improved the handling. It also holds up my travel trailer very well but even if you don't have a trailer to haul, yo should have this anyway. Great product. (I mechaniced at 24 Hour Le Mans twice, 24 hrs Daytona 15 times, 2 times at Indy 500 and a lot of other tracks.)

2019 Ford F-150 Lariat 4X4. RAS Kit #3611YHD. Install went well with only a few problems. Recommend pretreating Bump stop bolts with NUT BUSTER 2-3 DAYS IN ADVANCE. Bolts have blue Loctite on threads. Springs installed with no problem, setting to 40% proved more difficult on driver side. Performance out on the road was definetly improved. Truck felt more planted to the road & no sway on curves. Have yet to hook up my travel trailer due to weather. After install truck rear raised about 1", so once I hook up my trailer will measure squat.

Fast shipping and installed perfectly ,my 2013 F150 rides nice and just hooked up our camper and was pleased to see the truck not squat .

Overall ride has improved dramatically. The truck handles bumps and curves much better than stock.

I installed my 6311YHD on my 2023 F150 Fx4 several weeks ago and used it pulling my Searay boat. I couldn’t even tell it was towing anything. I had just taken it from storage and the tires were low It works great and I’m very pleased I got the kit I was debating on airbags vs RAS . The airbags would have required a shop stay of one day, it was just a few hours at my house and no hassle of shuttling pu to their shop I know I could cut my install time down if had to do another one

Just came back from a trip in the mountains and I'm truly impressed on how well the truck handled going up the hills and around the corners hits feels so much tighter

Leveled truck when towing heavy trailer. Stability was also much better when towing.

2023 F-150, much better experience towing the travel trailer. Less bounce, and handling is better. Less squat, levels out the whole package. Did raise rear of truck 3” so had to lower Andersen hitch down to compensate.

2022 F150 Lariat 6.5 ft bed 3.5 V6 Ecoboost. Very easy install and the system performs exceptionally well. Pulling a 10000 GVWR Fifth Wheel with ~ 1400 pin weight. Truck is dead level when pulling. No additional ride harshness when not towing. Highly Recommend!

Helped my f50 a lot! It raised the back about 1 3/4 before our trailer was hooked up. Definitely feels better towing and feels better when I’m just driving around town. Thanks

So far so good I purchased this because we knew we would be getting a camper and I wanted as much stability as possible. Seems to help with the rear sagging while hauling and it was easy to install. ⭐️⭐️⭐️⭐️⭐️

I purchased the 3611yhd suspension kit for my 2011 ford f150 4wd. It wasn't hard to install and there are plenty of videos and instructions to help with installation. The truck seems to stand a little taller and the suspension feels real tight like new. When hooked to my 2000lb utility trailer there was no drop and you can't even feel the trailer hooked up. Can't wait to load the trailer up and see what has changed. For now I feel like this was an excellent upgrade for my truck. I originally bought it because we are in the process of getting a 31ft travel trailer weighing 6600lbs. Can't wait to try this out. Thank you for inventing this upgrade for those of us looking for safety upgrades for towing.

Installation was simple on my 2025 F150. It completely changed how the truck feels when towing my travel trailer. I am very happy and would definitely recommend RAS.

2013 F-150 Super Crew needed some more payload for towing. RAS is the just the ticket! Great quality, easy install.

Easy install and happy with the outcome. Handles the load in the truck like its not even there

Not sure did not with the trailer at all

2020 Ford F150, 3611-YHD The kit fits on my truck great. All parts complete and easy to follow. High quality parts. I bought for my 23 ft. Camper Trailer to help eliminate squatting.