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  1. Vehicle Suspension
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  3. Leaf Springs and Helper Springs
  4. Towing/Load Leveling
  5. Standard Duty
  6. Rear Axle Suspension Enhancement
RoadActive Suspension Custom Leaf Spring Enhancement Kit
RAS

RoadActive Suspension Custom Leaf Spring Enhancement Kit

Part Number: RAS3611-B
In Stock
$539.00
Vehicle Suspension

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2,000-lb Capacity. Convert your vehicle's leaf springs into a mechanically active suspension system. RAS adjusts to your load to level your ride. The system also increases stability, handling, and control by improving traction and reducing sway. Great Prices for the best vehicle suspension from RAS. RoadActive Suspension Custom Leaf Spring Enhancement Kit part number RAS3611-B can be ordered online at etrailer.com or call 1-800-940-8924 for expert service.
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RAS Vehicle Suspension - RAS3611-B

  • Leaf Springs and Helper Springs
  • Towing/Load Leveling
  • RAS
  • Standard Duty
  • Rear Axle Suspension Enhancement
  • Helper Springs

2,000-lb Capacity. Convert your vehicle's leaf springs into a mechanically active suspension system. RAS adjusts to your load to level your ride. The system also increases stability, handling, and control by improving traction and reducing sway.


Features:

  • Custom kit converts your vehicle's factory leaf springs into a mechanically active suspension system
    • Actively strengthens leaf springs for improved ride quality with or without a load
  • All-in-one suspension system improves stability, handling, and control
    • Eliminates axle wrap, wheel hop, and bottoming out
    • Reduces dangerous sway and body roll while cornering
    • Keeps your ride level when towing or hauling a heavy load
    • Improves traction while breaking and accelerating
  • Variable-rated coil tension springs automatically adjust to your vehicle's load
    • Activate immediately to support the extra weight
    • Disengage when unloaded, allowing your leaf springs to perform as intended
  • Customizable coil springs can be adjusted during installation to accommodate your towing or hauling needs
    • Independently adjustable for side-to-side leveling of off-center loads
  • Helps extend the life of leaf springs, shock absorbers, shackles, and even tires
  • Durable, epoxy e-coated steel construction
    • Corrosion-resistant brackets on the ends of each unit have a salt spray rating of more than 800 hours
  • Easy, bolt-on installation - no drilling, cutting, or welding required
    • Unit secures under the leaf spring and around the factory U-bolts
    • Fully assembled kit and hardware are included
  • Maintenance-free - adjustments and monitoring aren't needed once installed
  • Made in the USA


Specs:

  • Weight capacity: 2,000 lbs
    • RoadActive Suspension will not increase your vehicle's weight-carrying capacity
  • 5-Year warranty
  • 30-Day money-back guarantee


All-In-One Suspension System

When towing or hauling a heavy load, you may encounter a number of problems that can make your driving experience difficult or dangerous, such as sway, body roll, or bottoming out. When your vehicle is weighted down, your factory leaf springs can't counteract these problems to the extent that they are supposed to. The weight will overpower the leaf springs and cause them to twist or flatten out. When that happens, they cannot support, level, or stabilize your vehicle effectively. Additionally, because your factory leaf springs are passive, they won't begin to tackle problems such as sway until those problems have already started.


Diagram of RAS Installed

RoadActive Suspension (RAS) kits enhance those passive leaf springs by converting them into a mechanically active, all-in-one suspension system. RAS kits have variable-rated coil tension springs that automatically adjust to your heavy load. Other suspension systems only solve a few problems and usually at the expense of other improvements your factory leaf springs may need. RAS, on the other hand, is a unique kit that provides everything you want in a suspension system without any trade-offs. It eliminates bottoming out like air springs, reduces sway and body roll like sway bars, keeps your ride level like helper springs, and improves traction and braking control like traction bars. This improves your vehicle's stability, handling, and control while you are towing or hauling, as well as when your vehicle is unloaded. RAS also makes your overall driving and towing experience safer and more comfortable, which greatly lessens driver fatigue.


How RAS Works

Close-Up of RAS Tension Spring

Each RAS unit has a powerful variable-rated coil tension spring that converts your passive leaf spring into a mechanically-active system. Once your vehicle is loaded, the tension springs immediately activate to absorb and support the weight. This allows your leaf springs to maintain their bowed position and keeps them from flattening out or flipping over, which greatly hinders their ability to bear a heavy load. The tension springs are variable-rated, which means that the heavier your load is, the more assistance they provide to your leaf springs. Because of this design, RAS reacts instantaneously, whereas hydraulics, air springs, and other suspension systems take time to react. And unlike your factory leaf springs, RAS stops sway and sag before they even start to happen. Additionally, when your vehicle is unloaded, the tension springs disengage, allowing your leaf springs to perform as intended without hardening your ride. RAS won't hinder your leaf springs' movement, nor will it cause any friction between any of the brackets.


Eliminates Axle Wrap and Wheel Hop

RAS Eliminates Axle Wrap

When under a heavy load, leaf springs are especially susceptible to axle wrap, which can cause wheel hop. Wheel hop is when the tires lose their grip on the road, causing a jarring, up-and-down movement. Axle wrap occurs when the circular motion of the tires cause the leaf springs to twist or rotate. If the leaf springs twist far enough, wheel hop can occur. RAS stabilizes your leaf springs by absorbing the force of the load they're trying to support. This eliminates axle wrap and wheel hop, as well as prevents your vehicle from bottoming out. Because of this, less strain is put on your vehicle. And by reducing some of this wear and tear, RAS helps extend the life of your leaf springs, shock absorbers, shackles, and even tires.


Reduces Sway and Body Roll

RAS eliminates sway and body roll

When driving along a curve while towing or hauling a heavy load, the back end of your vehicle or trailer can start to shift with that weight. If your factory leaf springs have flattened or twisted under this load, they won't be able to prevent it from shifting. Because of this, your trailer will sway away from your vehicle. This makes driving challenging and dangerous, as it increases the risk of body roll, which is when your vehicle drastically leans to one side. This can often cause you to completely lose control of your vehicle. Body roll is especially prevalent with multi-passenger vans and vehicles towing long campers, trailers, or boats. RAS provides a much safer ride by reinforcing your factory leaf springs and stabilizing your load. This helps prevent sway from occurring and reduces the chance of body roll while cornering, turning, and swerving. RAS also lessens the rocking motion that happens during windy conditions or when a semi passes by on the road.


Levels Your Ride and Improves Traction

RAS Levels Your Ride

When your vehicle is overloaded, the bulk of the weight transfers to the rear axle. Your factory leaf springs then become overwhelmed by this weight, as they are not strong enough to support it. This causes the back end of your vehicle to sag and the front end to rise, which means that the front tires have lost some of the grip they need with the road. In addition to loss of traction, it can also cause poor headlight aim, unintentional swerving, and an extremely bumpy and uncomfortable ride. RAS bolsters your factory leaf springs and enables them to provide support for your load without compromising ride quality or comfort. This keeps your ride level from front to back whether you are hauling a load in the bed or towing a boat, trailer, or camper. RAS also ensures that your tires have the traction they require while braking and accelerating, which improves the overall driving experience.


Customizable Coil Tension Springs

Adjusting Spring With Spacer

RAS is also customizable. During installation, the coil tension springs can be adjusted to 2 different tension settings or anywhere in between for improved road handling and support. To do this, rotate the springs while keeping the threaded rod still. As you turn the spring, use one of the 2 included spacers as a gauge to measure the widening gaps between the coils. In order for the RAS units to work as intended, you must tension the coils to a minimum of 25 percent with the 1mm white spacer and no more than 40 percent with the 2mm spacer. The springs can also be independently adjusted to compensate for off-center loads such as a handicap lift.


Easy, Bolt-On Installation

RAS Once Installed

This custom-fit kit comes fully assembled and is easy to install. Each RAS unit simply bolts onto your factory leaf spring with the included hardware, and drilling, welding, and cutting aren't required. First, position the eye hook bracket so that it wraps around the top of the factory leaf spring eye. Then the axle bracket secures under the leaf spring and around the factory U-bolts on the other side of the leaf spring pack. Once the maintenance-free RAS units are fully installed, you won't need to monitor them as you would with air springs.


Corrosion-Resistant Steel Construction

RAS Construction Close-Up

RAS is extremely durable and corrosion-resistant. The units are constructed of high-grade alloy steel, and they have an epoxy e-coat on the coil springs to provide extreme corrosion resistance. The brackets on the ends of each unit resist the effects of water and other elements, and they have a salt spray rating of more than 800 hours.



3611-B RAS Custom Active Suspension System for OEM Leaf Springs - Rear Axle

Installation Details RAS3611-B Installation instructions

This Product Fits The Following Vehicles




Customer Satisfaction Score:

Ratings & Reviews

4.7

488 reviews
2,000-lb Capacity. Convert your vehicle's leaf springs into a mechanically active suspension system. RAS adjusts to your load to level your ride. The system also increases stability, handling, and control by improving traction and reducing sway.

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See what our Experts say about this RAS Vehicle Suspension

  • Is Leaf Spring Enhancement Worth it With 2018 Ford F-150 WIth Timbrens
    Hey there Steve; thanks for writing in and when it comes to body roll and sway for your 2018 Ford F-150, the better option is the RoadActive Suspension Custom Leaf Spring Enhancement Kit, with the right one depending on if your F-150 is 2WD or 4WD: - 2WD: RoadActive Suspension Custom Leaf Spring Enhancement Kit # RAS3611-B - 4WD: RoadActive Suspension Custom Leaf Spring Enhancement Kit # RAS3611-Y Honestly, I would go with these over the Timbrens # TFR1504E, and frankly not even both...
    view full answer...
  • Will Roadmaster Active Suspension Raise the Back of 2018 Ford F-150
    Installation of the RoadActive Suspension Custom Leaf Spring Enhancement Kit # RAS3611-Y on your 2018 Ford F-150 can raise the back end of the truck a little. According to RoadActive, it is likely you won't even notice but at most you are looking at about an inch. However, if your suspension is worn the lift may be more significant with the added support from the RAS system. If you have a 4WD model then the # RAS3611-Y is the correct kit for your truck. If you have the 2WD then you will...
    view full answer...
  • Is RoadActive Suspension Kit Needed In Addition to Weight Distribution
    The answer to your question will depend on how you use your truck. Vehicle-based systems like the RoadActive Suspension system or air bags will work just fine with a weight distribution system, but they work best to suspend weight being hauled in the bed of a truck or in a vehicle's cargo area, while a weight distribution system does a better job of transferring a trailer's tongue weight from the rear tow vehicle axle to the front. If in addition to towing you also frequently carry heavy...
    view full answer...
  • Recommended Suspension and Sway Control for Springdale Trailer and 2018 Ford F-150
    The RoadActive Suspension Custom Leaf Spring Enhancement Kit - Heavy Duty # RAS94FR is rated for up to 3,000 lbs and the # RAS3611-B rated for 2,000 lbs are both good options for suspension enhancement to reduce sag. If you want to reduce sway then you'd be better off using a weight distribution system with sway control integrated. I recommend the Strait-Line Weight Distribution System w/ Sway Control - Trunnion Bar - 12,000 lbs GTW, 1,200 lbs TW # RP66084 along with hitch ball # 19286....
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  • How Does RoadActive Suspension RAS3611-B React When Off-Road
    The RoadActive Suspension Custom Leaf Spring Enhancement Kit # RAS3611-B will affect the articulation in heavy off-roading due to the nature of how it works, installing over the axle.
    view full answer...
  • Best Rear Suspension Enhancement For 2017 Ford F-150 to Help Sag When Towing
    The TorkLift StableLoad Suspension Upgrade # TLA7310S that fits your 2017 Ford F-150 is more of an upgrade for ride quality, and wouldn't do a great deal to help with sag. There is an option that will help tremendously with sag, however, which is a kit from RoadActive Suspension; the correct option will depend on if you have 2WD or 4WD, and how much squat you are experiencing. 4-Wheel Drive - Max of 2 to 3 Inches of Squat: RoadActive Suspension Custom Leaf Spring Enhancement Kit # RAS3611-Y -...
    view full answer...
  • Is RoadActive Suspension System Compatible Wtih 2021 Ford F-150 With Auto-Leveling Headlights
    I spoke with the folks at RoadActive Suspension and was told that because the RAS system sits within the footprint of the leaf springs, it will not interfere with the sensors for the Auto Headlight feature, but you will need to move the adjustable cross-bolt from its spot at the end of the bracket to the second to last holes as shown in provided photo. We offer 3 different RoadActive Suspension Kits for the 2021 Ford F-150. I'll list the fits below: • Part # RAS3611-YHD for 3000 lbs of...
    view full answer...
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  • RAS Kit Makes 2022 Ford F-150 Sit High
    Thank you so much for your purchase from etrailer.com for your 2022 Ford F-150 2WD of the RoadActive Suspension Custom Leaf Spring Enhancement Kit # RAS3611-B or 4WD # RAS3611-Y. According to RAS their kits will raise the truck about 1 to 1-1/2 inches no matter what, and there's nothing you can do about that. But they also say the most important thing in this regard, to have it at the lower end of that, is to have the tension set to the lowest setting (of the two available) during installation....
    view full answer...
  • What is the Best Suspension Enhancement for My 2022 Ford F-150
    The suspension enhancement kit I recommend for your 2022 Ford F-150 is the RoadActive Suspension Custom Leaf Spring Enhancement Kit. This kit will not add any extra payload capacity to your truck but it will improve suspension sag and will improve the quality of your ride, loaded or unloaded. Another great thing about the RAS is they are quicker and easier to install than air bags and do not require the maintenance that air bags do. If your F-150 is a 4-wheel drive you will need part...
    view full answer...
  • How to Eliminate Porpoising when Towing Trailer with 2018 Ford F-150
    I have a great solution to the porpoising and bounce you are experiencing when towing with your 2018 Ford F-150. I recommend taking a look at the RoadActive Suspension Custom Leaf Spring Enhancement Kit # RAS3611-Y if you have a 4WD or # RAS3611-B if you have the 2WD model. This will essentially convert your truck's leaf springs into a mechanically active suspension system. It will drastically improve the stability and control of your ride as well as eliminate that porpoising when towing....
    view full answer...
  • Recommended Rear Helper Spring Option to Eliminate Suspension Sag of 2022 Ford F-150
    I'd be happy to assist with that. Back when most folks didn't use pickup trucks as daily drivers, trucks had stiffer rear suspensions. As trucks began selling better, more folks used them as a passenger vehicle, rather than the workhorse they were originally intended as. People then found that trucks ride like buckboards, and consumers complained. The vehicle manufacturers have replied to consumer complaints of poor ride quality by making the rear suspensions of their half ton trucks...
    view full answer...
  • Standard or Heavy Duty RoadActive Suspension for 2020 Ford F-150 With 2-Wheel Drive
    That's a good question and the right RoadActive Suspension Kit for your 2020 Ford F-150 with two-wheel drive really comes down to just two things: the amount of squat you are experiencing and if you are towing, the amount of tongue weight on the back of your truck. So the correct kit will depend on the following: - Maximum of 2 to 3 Inches of Squat: Standard Duty RoadActive Suspension Custom Leaf Spring Enhancement Kit # RAS3611-B - More Than 2 to 3 Inches of Squat And/Or 600 lbs or More...
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  • Recommended Rear Suspension Enhancement For 2021 GMC Sierra 1500 Denali With Adaptive Ride Control
    First congratulations on the new truck! For your new 2021 GMC Sierra 1500 Denali with the adaptive ride control I recommend RoadActive Suspension Custom Leaf Spring Enhancement Kit # RAS4611 which is a confirmed fit for your truck and will work perfectly with the adaptive ride control. This kit provides 2000lbs of load leveling support and will actually improve the ride quality of your truck due to this kit eliminating axle wrap, and fighting body roll and sway. Adding this kit will...
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  • Suspension Helper Springs to Reduce Sway on a 2020 Ford F-150
    The best suspension enhancement kit for your 2020 Ford F-150 that is going to help reduce body roll and sway as well as give your truck the added support it needs is the RoadActive Suspension Custom Leaf Spring Enhancement Kit. The reason this kit is superior to the rest is because it is what is known as an "active" system, which means that it is constantly reinforcing your F-150's original leaf spring suspension. Because of where it installs (see accompanying photo) the force normally...
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    Image 1 for
  • Recommended Sway Control for Towable Ice Fishing House
    This is a pretty common occurrence for newer 1/2 ton trucks. Due to their customer's demands for a more-car like ride featuring a softer rear suspension, the handling while towing suffers. If you're transporting the ice fishing house on a trailer, you can use a weight distribution system along with a sway control system. If the tongue weight of the trailer is under 800 lbs, I'd go with the Curt # C17051 along with a friction sway control unit like # 17200. If the ice house has its own...
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  • Correct RoadActive Suspension Kit for 2018 Ford F-150
    There is a RoadActive Suspension Kit that will work for your 2018 Ford F-150 but # RAS3611 is not a fit for your truck. The exact model number of RoadActive Suspension Kit you want for your F-150 is going to be # RAS3611-B.
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  • Adjustable Rear Suspension Enhancement Compatible With Headlight Sensor On a 2021 Ford F-150 Lariat
    While there currently are no air bag helper springs that are compatible with the headlight sensor on your 2021 Ford F-150 Lariat we do have some other options. The RoadActive Suspension Custom Leaf Spring Enhancement Kit can be used with your headlight sensors. Unlike most other systems these are adjustable and are available in different weight capacities for you to choose the best kit for your truck. 2WD RoadActive Suspension Custom Leaf Spring Enhancement Kit # RAS3611-B(2,000lb capacity) 4WD...
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  • Leaf Spring Enhancement for a 2021 Ford F-150 4wd Towing a 7,400 lb. 5th Wheel
    Since your 2021 Ford F-150 is a 4wd you will want the RoadActive Suspension Custom Leaf Spring Enhancement Kit # RAS3611-Y, as this is the correct leaf spring enhancement for the 4wd models. This will be a great option for towing your 5th wheel. This all-in-one suspension system will improve stability, handling, and control while eliminating axle wrap, wheel hop, and bottoming out. It will also help to reduce dangerous sway and body roll while cornering and keeps your ride level when towing...
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  • Which RoadActive Suspension System Should I Use On My 2019 Ford F-150 4x4?
    The correct kit that you want is RoadActive Suspension Custom Leaf Spring Enhancement Kit # RAS3611-Y. The RoadActive Suspension Custom Leaf Spring Enhancement Kit # RAS3611-B is made for the 2x4 version of your 2019 Ford F-150 so will not want to go with this kit. In regard to the parking brake, you will not have an issue with this Y kit interfering with your parking brake. I attached a helpful installation video that shows how easy the installation process is; just keep in mind the vehicle...
    view full answer...
  • Suspension Enhancement Recommendation for 2019 Ford F-150 for Everyday Driving and Towing
    There is a perfect option for a suspension enhancement system that will work to benefit your 2019 Ford F-150 for everyday driving as well as towing; I strongly recommend the RoadActive Suspension Custom Leaf Spring Enhancement Kit, and correct one will depend on if your F-150 has Two-Wheel Drive or Four-Wheel Drive - Two-Wheel Drive: RoadActive Suspension Custom Leaf Spring Enhancement Kit # RAS3611-B - Four-Wheel Drive: RoadActive Suspension Custom Leaf Spring Enhancement Kit # RAS3611-Y...
    view full answer...
    Image 1 for
  • What Would Cause Bouncy Ride Quality When Towing Trailer with Weight Distribution System
    If you are experiencing a bouncy ride condition with your weight distribution system that indicates that you have a WD system that is rated too high for the tongue weight of your setup. If you use a system rated to high you end up with a harsh or bumpy ride quality and if you go with a system rated too low you end up with an ineffective system. There isn't a product out there that will fix this like the Roadmaster kit you mentioned. The best way to pick out a weight distribution system...
    view full answer...
  • RoadActive Suspension Kit Recommendation for Reducing Sag on 2015 Ford F-150 when Towing
    Yes, the RoadActive Suspension Kit # RAS3611-B for your 2015 Ford F-150 would be exactly what you would need to help eliminate the sag you are experiencing with your heavier trailer and it will also greatly reduce side to side sway. This kit also install very easily.
    view full answer...
  • Properly Rated Weight Distribution Hitch For Geopro Travel Trailer
    Ideally you want to select a WDS with a rating that allows your tongue weight to fall in the middle of its rating. By using a WDS that is rated too high for the travel trailers tongue weight your ride quality is effected. It will be stiff and more harsh than needed. I recommend the Blue Ox SwayPro Weight Distribution w/ Sway Control, # BXW0750. For 2" hitches and 2-5/16" couplers. Other weight distribution systems have lift brackets that require you to apply a good amount of leverage...
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  • Which RoadActive Suspension For 2018 Ford F-150 Towing 5000-lbs Trailer
    For towing a trailer that weighs 5000-lbs and has a tongue weight of 500-lbs, the standard duty RoadActive Suspension Custom Leaf Spring Enhancement Kit # RAS3611-Y (4wd) or RoadActive Suspension Custom Leaf Spring Enhancement Kit # RAS3611-B (2wd) would be my recommendation. Going with the Heavy Duty application would likely create a bit stiffer suspension than needed and adversely effect your unloaded ride quality. I've linked some review videos of this spring system for you to have...
    view full answer...


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