

🚛 Elevate your F150’s haul game—stronger, steadier, smarter.
The RAS RoadActive Suspension 3611-YHD is a heavy-duty rear leaf spring upgrade designed for Ford F150 4WD models (2009-2022). It increases rear suspension strength by 40-50%, reduces rear squat by up to 3 inches, and improves handling and stability without compromising ride comfort. The kit installs easily in about an hour with no special tools or maintenance, making it the perfect upgrade for towing and hauling professionals seeking reliable, hassle-free performance.


| Manufacturer | RAS |
| Brand | RAS |
| Package Dimensions | 79.25 x 25.4 x 13.72 cm; 15.22 kg |
| Item model number | 3611-YHD |
| Manufacturer Part Number | 3611-YHD |
| Position | Rear |
| Item Weight | 15.2 Kilograms |
B**O
I didn't get a chance to try hauling my camper (28' Jayco) without these installed, so I can't truly compare them in that regard. But I can say that it did improve handling (less body roll in curves and corners, less wheel hop on wash boards) from the factory ride. Installed on 2023 Ford F-150 Tremor. I read multiple posts of people stating that a 28' camper is unmanageable with a half ton tow rig. I have not towed a huge amount, but I have towed with strong cross winds and poor pavement conditions (dips and varying grades) since installing this. My half ton handled everything well so far, and I believe the HD RAK system have made a huge difference to that. I have not experienced "porpoising" (front end of the truck bobbing up and down after going over a hump in the road) as many people with similar trucks have reported. NOTE. I do have a Husky Centerline sway and leveling tow hitch on my truck and trailer as well, and believe these 2 systems coupled together make all the difference in towing large campers with a half ton. I'm nowhere near my gross trailer weight rating (11,000 lbs) but I am near or at my payload capacity of 1640 lbs when trailer and family are loaded up.
N**E
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.
W**9
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.
A**R
Easy install. Delivers as quoted.
J**E
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.
Trustpilot
3 weeks ago
2 months ago