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

RoadActive Suspension Custom Leaf Spring Enhancement Kit

Part Number: RAS4611
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 RAS4611 can be ordered online at etrailer.com or call 1-800-940-8924 for expert service.
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RAS Vehicle Suspension - RAS4611

  • Leaf Springs and Helper Springs
  • Rear Axle Suspension Enhancement
  • RAS
  • Standard Duty
  • 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.



4611 RAS Custom Active Suspension System for OEM Leaf Springs - Rear Axle

Installation Details RAS4611 Installation instructions

This Product Fits The Following Vehicles




Customer Satisfaction Score:


Customer Reviews

RoadActive Suspension Custom Leaf Spring Enhancement Kit - RAS4611

Average Customer Rating:  4.7 out of 5 stars   (782 Customer 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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The ride is smoother pulling my ~5,000 lb cargo trailer and it helped a lot with my truck sagging, it sags about 2” less now.



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An excellent solution for leveling my tow vehicle! The road active suspension system definitely improved both the ride and the leveling of my vehicle!



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See what our Experts say about this RAS Vehicle Suspension

  • Can Timbrens be Used with RoadActive Suspension Kit on 2011 Chevy Silverado
    For your 2011 Chevy Silverado I recommend starting with the RoadActive Suspension Kit # RAS4611 that you mentioned by itself to see how everything handles when pulling your 34 foot trailer. It wouldn't necessarily be "overkill" to add the Timbren Rear Suspension Enhancement System # TGMRTT15S (the two components can indeed be used together) but maybe more accurate to say that the Timbrens might not really be utilized if the RAS is doing its job. Because the Timbrens will replace the factory...
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  • Best Suspension Enhancement for 2020 Chevy Silverado 1500 for Squat When Towing
    Thanks for the photo and the Timbren Rear Suspension Enhancement System # TGMRCK15S you mentioned is a good option for helping keep your 2020 Chevy Silverado 1500 level, but the best option is something a little different, the RoadActive Suspension Custom Leaf Spring Enhancement Kit # RAS4611. The reason why the RAS kit is the best is because it is an active system, which means it continually works to reinforce your Silverado's leaf spring suspension. The force normally put on your Chevy's...
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  • RoadActive Suspension Enhancement for 2004 GMC Denali with Quadrasteer
    I have an option for you, but the RoadActive Suspension Custom Leaf Spring Enhancement Kit # RAS4611 is not compatible with the Quadrasteer system on your 2004 GMC Sierra Denali. Your best bet and the only confirmed suspension enhancement solution that won't interfere with your Quadrasteer components, is the Timbren Rear Suspension Enhancement System # TGMRCK25S. These hollow rubber springs sit above the rear axle to help stabilize and level your Sierra.
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  • How Much Can a 2004 Chevy Suburban 1500 LS Tow
    The towing capacity of a 2004 Chevrolet Suburban 1500 LS can be as high as 8,400 lbs but the exact towing capacity will vary by options so be sure to take a look in the owner's manual. If the loaded weight of the trailer does not exceed the towing capacity of the vehicle then you will be safe to tow. That said, it sounds like you could be towing toward the upper limit of the vehicle's capacity so in which case you'll want to use some suspension enhancements alongside the weight distribution...
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  • Suspension Enhancement that Can Fit 2018 GMC Sierra 1500 with Lowering Shackles
    Since your lowering shackles change the distance between the rear axle and the truck frame you would not be able to use the # SS45MR for suspension enhancement as it would be too tall.
    view full answer...
  • Suspension Enhancement Kit for 2011 GMC Yukon XL 2500
    Hey Will, so we don't have an air bag kit that fits your 2011 GMC Yukon XL 2500 but we do have a really great solution with the Roadactive suspension kit part # RAS4611 which I would have recommended over an air bag kit anyway as it's an easier install, easier to maintain, and also improves ride quality and handling unlike all other options.
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  • Suspension Enhancement Recommendation for a 2021 GMC Sierra 1500 Diesel
    We need to go with a different suspension enhancement recommendation for you because air bag kits like the Firestone Ride-Rite Air Helper Springs # F2609 you're looking at won't fit with your 2021 GMC Sierra 1500 diesel - this is due to the air spring sitting up against the exhaust. When I reached out to my contact at Firestone he said they've heard of some dealers or shops modifying the exhaust hangers but the newer diesel models are few and far between so they're aren't any kits designed...
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  • Air Bags vs. RoadActive Suspension Enhancement For 2023 GMC Sierra 1500
    Really good questions. And I understand being a bit skeptical of the RoadActive (RAS) suspension system, and it does have its pros and cons for your 2023 GMC Sierra 1500 when compared to the Firestone Ride-Rite Air Helper Springs # F2609. Will the RAS help with sag? Yes, but to a point. They will level you out if your truck sags up to 2 to 3 inches; anything more than that you won't be completely level. And keep in mind there are different RAS kits for your '23 Sierra 1500 depending on...
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  • Will The Firestone Ride-Rite Air Bag Helper Springs Fit 2023 Chevrolet Silverado 1500 w/ 3.0L Diesel
    The Air Lift LoadLifter 5000 Ultimate Plus Air Springs # AL88288 are our only air springs compatible with the 3.0L Duramax Diesel in your 2023 Chevrolet Silverado 1500 High Country. The Firestone Ride-Rite Springs # F2609 you found are not compatible with the diesel engine models. Do note the Air Lift is not for use on vehicles which have the Adaptive Ride Control feature. So if you have this feature you will want to look at the RoadActive Suspension # RAS4611 as it does allow for some...
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  • Recommended Air Bag Kit for a 2023 GMC Sierra 1500 Denali w/ Adaptive Ride Control
    Thanks for the picture! For your 2023 GMC Sierra 1500 with adaptive ride control you'll want the Air Lift LoadLifter 5000 Air Helper Springs item # AL57388. This air bags have a 5,000 lbs load leveling capacity that will keep the rear end of your truck from sagging when you are towing your trailer. These only fit the 4WD models. I don't have a set that works with 2WD Sierra's that have the adaptive ride control. I have linked an installation video below to help you get these air bags set...
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  • Will The RoadActive Suspension Kit Fit On a 2022 Chevrolet Silverado ZR2?
    You are able to use either the 2,000LB # RAS4611 or 3,000LB # RAS54FR RoadActive Suspension Custom Leaf Spring Enhancement Kit for your 2022 Chevrolet Silverado 1500 ZR2. The only reason you would not be able to use either kit is if your ZR2 has the mono leaf rear springs.
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  • Suspension Enhancement for 2024 GMC Sierra 1500 AT4X
    Hi Bill; I'm not surprised the # T53MR gives you a rough ride since it is the severe service kit. Timbren SES isn't overly forgiving to begin with, and this particular design is for constant loads like a slide-in camper. I would recommend the SumoSprings but unfortunately they won't work with AT4 models. You will need to look outside of the jounce style springs for suspension enhancement. As long as you don't have the composite mono-leaf springs I recommend the RoadActive Suspension Custom...
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  • Recommended Rear Suspension Enhancement For a 2023 GMC Sierra 1500 Denali With Adaptive Ride Control
    I recommend using either the 2,000LB # RAS4611 or 3,000LB # RAS54FR RoadActive Suspension on your 2023 GMC Sierra 1500 Denali. These are both compatible with the adaptive ride control on your Denali. The 2,000lb kit I feel is best for occasional and light loads. If you constantly carry heavy loads the 3,000lb kit is going to be your better option. Both these systems are adjustable so you are able to dial in the ride quality.
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  • Suspension Enhancement For 2018 GMC Sierra 1500 4WD That Wont Affect Unloaded Ride
    So there is a really good option for suspension enhancement for your 2018 GMC Sierra 1500 4x4 that won't affect the unloaded ride (and will even improve it), but the Air Lift LoadLifter 5000 Ultimate Air Helper Springs with Internal Jounce Bumpers # AL88204 can indeed affect it. When aired down, the jounce bumpers in the springs can engage, and they are quite stiff so the ride would be the same. Instead, the much better option for your Sierra is a leaf spring enhancement kit: - RoadActive...
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  • Can I Use Both the Roadmaster RAS and SumoSprings on a 2020 Chevy Silverado 1500?
    I took a look at the instructions for both the SumoSprings item # SS45FR and the RoadActive item # RAS4611. They both fit and will work well to reduce squatting or bouncing while towing. You will want to start with the lowest setting on the RAS system and go up from there depending on your comfort. Both systems are confirmed to fit your 2020 Chevy Silverado 1500 4WD.
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  • Recommended Rear Suspension Enhancement For 2017 Nissan Titan SV 2WD
    I have a different rear suspension enhancement option, but the Air Lift # AL57331 is only confirmed to fit 2017 Nissan Titan 4WD models, and will not fit yours that is 2WD. There is not an air helper spring kit confirmed to fit the 2WD models. Instead I recommend going with the RoadActive Suspension Custom Leaf Spring Enhancement Kit # RAS4611 which provides 2000lbs of load leveling support to fight suspension sag when carrying a heavy payload or towing a trailer. This kit also improves...
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  • Does RoadActive Leaf Spring Enhancement Kit Affect Unloaded Ride Height On 2021 Silverado 1500?
    The RoadActive Suspension Custom Leaf Spring Enhancement Kit for your 2021 Chevrolet Silverado 1500 will not affect the unloaded ride height or ride quality. This system only comes into play when the truck is loaded down; when weight is added to the back of the truck this kit automatically adjusts to keep your truck level and reduce body sway on turns and also enhance braking and traction. When deciding if you should get the Standard Kit # RAS4611 (rated at 2,000lbs) or the Heavy Duty...
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  • SumoSprings or Timbren Rear Suspension Enhancement For 2021 Chevy Silverado 1500
    For your 2021 Chevrolet Silverado 1500 that you use to tow a trailer I recommend going with the Sumo Springs # SS45FR. These helper springs offer 1500lbs of load leveling support which will be plenty for towing a trailer as the suspension of your truck is only supporting the tongue weight of your trailer. I do not recommend using Timbren Suspension Enhancement as they are made out of a much stiffer material and are known for causing a very stiff unloaded ride. Now the # SS45FR is designed...
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  • Selecting The Correct RAS RoadActive Suspension For a 2019 Nissan Titan
    There are actually 3 RoadActive Suspension Custom Leaf Spring Enhancement Kits available for your 2019 Nissan Titan. The only difference in all 3 kits is the weight capacity for the coil springs. 2,000LB Capacity # RAS3611 3,000LB Capacity # RAS3611-HD 4,000LB Capacity # RAS4611 If your 6,000lb travel trailer is the largest amount of weight you will pull with your 2019 Nissan Titan then the 2,000LB Kit # RAS3611 will work the best. If you also plan on filling your bed with gear and/or...
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  • Will the RoadActive Leaf Springs # RAS4611 Affect the Unloaded Height of My 2021 Silverado 1500?
    No, the RoadActive Leaf Spring Enhancement Kit # RAS4611 will not affect the unloaded ride height on your 2021 Chevy Silverado 1500 4x4. This system only comes into play when the truck is loaded down; when weight is added to the back of the truck this kit automatically adjusts to keep your truck level and reduce body sway on turns and also enhance braking and traction. If you need a heavier enhancement kit for heavier loads (3,000 pounds compared to the 2,000 pound maximum of the # RAS4611),...
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  • Correct RoadActive Suspension Enhancement Kit for a Silverado 1500 Trailboss
    The correct RoadActive Suspension Custom Leaf Spring Enhancement Kit for a 2021 Chevrolet Silverado 1500 Trailboss is part # RAS4611. The factory lift won't affect fit of the above kit. It's a bolt-on kit that is very easy to install.
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  • Front and Rear Suspension Kits for 2008 Nissan Titan 4 x 4 with WD Hitch and Iron Bull Front Bumper
    You have an interesting combination of circumstances with your 2008 Nissan Titan 4x4 that is both towing a 7000-lb trailer with a weight distribution hitch (WDH) and also using a fairly heavy Iron Bull front bumper with winch/hitch to maneuver the trailer. In general, you can say that a WDH and a front-axle suspension helper system will tend to work against each other. The WDH will try to push some of the trailer's tongue weight (TW) forward onto the front axle while the front axle suspension...
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  • Comparing Suspension Stabilizer Kits For 2006 Chevrolet Silverado Towing Enclosed Trailer
    Both of the systems you mentioned, part # RAS4611 and part # SSA5MTKT are designed to give you more stability and balance when towing. The biggest difference is the load capacity with the weight capacity of the # RAS4611 at 2,000-lbs versus the capacity of 950-lbs for part # SSA5MTKT. Both require no drilling and are simple installations. Between these two systems I would go with the RoadActive # RAS4611 system because of the increased capacity. This system would help if you decide to...
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  • Will the SumoSprings Solo Custom Helper Springs Fit a 2021 GMC Sierra 1500 AT4
    The SumoSprings Solo Custom Helper Springs - Rear Axle # SS65FR are confirmed to fit your 2021 GMC Sierra 1500 AT4. However, I would not recommend them. Since the AT4 has a 2" lift, the SumoSprings would likely be ineffective unless you are experiencing a lot of sag under a heavy load. They already require some sag before they engage, so the additional lift will increase the distance they need to move before they start to work. Instead, I recommend the RoadActive Suspension Custom Leaf...
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