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

RoadActive Suspension Custom Leaf Spring Enhancement Kit - Heavy Duty

Part Number: RAS3611-CHD
In Stock
$589.00
Vehicle Suspension

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3,000-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 - Heavy Duty part number RAS3611-CHD can be ordered online at etrailer.com or call 1-800-940-8924 for expert service.
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RAS Vehicle Suspension - RAS3611-CHD

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

3,000-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:

  • Heavy-duty 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: 3,000 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-CHD RAS Custom HD Active Suspension System for OEM Leaf Springs - Rear Axle

Installation Details RAS3611-CHD Installation instructions

This Product Fits The Following Vehicles




Customer Satisfaction Score:

Ratings & Reviews

4.7

564 reviews
3,000-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

  • Recommended Suspension Enhancement For A 2007 GMC Sierra 2500 With An In-Bed Camper
    Hi Mary, Do you leave the camper in the bed most of the time or does this truck spend a good chunk of time driving around without the camper? The SumoSprings Solo Custom Helper Springs # SSR-211-54 would be a great option if you leave the camper in the bed all the time. They take about 20 minutes to install and would just essentially replace the factory jounce stops for hassle-free, no-maintenance load leveling support. These have a 2,800lb capacity so they're be a bit stiff when the...
    view full answer...
  • Recommended RAS for a 2020 Chevy Silverado 2500 Towing a 5th Wheel Trailer
    Thanks for the picture! I would definitely go with one of the HD kits over the 2,000 lbs RoadActive item # RAS3611 you were looking at. Which one you will need is going to depend on whether or not your 2020 Chevy Silverado 2500HD has the factory overload spring. I have attached a picture below that shows what you need to check for. This picture shows a Chevy Silverado with an overload spring. Without Overload Spring - RoadActive Suspension Custom Leaf Spring Enhancement Kit item # RAS3611-HD With...
    view full answer...
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  • Comparing RoadActive Suspension Kits for a 2024 GMC Sierra 2500 4WD
    The difference between the RoadActive Suspension kits that fit your 2024 GMC Sierra 2500 have to do with the weight capacity and whether or not your vehicle has the factory top overload springs: - 2K # RAS3611 - 3K # RAS3611-CHD (with top overload springs) - 3K # RAS3611-HD (without top overload springs) If you can go with the higher weight rating I recommend doing so, otherwise you can just use the 2K kit and you'll be just fine.
    view full answer...
  • Difference Between RoadActive Kits for 2024 GMC Sierra 2500
    I would be happy to explain the differences. The RoadActive Suspension Kit # RAS3611 has the standard capacity of 2,000 lbs. The # RAS3611-HD and # RAS3611-CHD have a 3,000 lb capacity since they are the heavy duty versions. The # RAS3611-HD is designed for vehicles without top overload springs and the # RAS3611-CHD is for vehicles with factory top overload springs. I would choose the heavy duty version for your 2024 Sierra 2500. The RAS is adjustable with the standard model having 2 adjustment...
    view full answer...
  • Differences Between the RoadActive Suspension Systems For a 2022 GMC Sierra 2500
    There are currently 3 kits available for your 2022 GMC Sierra 2500. The correct kit will depend on the leaf springs under your Sierra and the amount of sag you are experiencing. Do note that none of these systems will increase your payload or towing capacity. They will only provide assistance to your factory suspension giving you a more level and safe ride. The first kit is the RAS System # RAS3611. This system is rated for a capacity of 2,000lbs and works best with trucks that squat...
    view full answer...
  • Differences Between The RoadActive Suspension Systems For A 2023 GMC Sierra 2500
    We currently have three different RAS kits available for your 2023 GMC Sierra 2500. Which kit you will need depends on the leaf springs that you have under your Sierra and the amount of sag that your are experiencing. After installing any of the three RAS systems that I explain below will not increase the payload or towing capacity on your Sierra, but they will provide assistance for your factory suspension giving them a more level and safe ride. The first kit that we offer is the RAS...
    view full answer...
  • Will the RoadActive Leaf Spring Kit # RAS3611-CHD Provide Support with a 3,400 Vertical Weight?
    When it comes to the 3,000-pound capacity of the RoadActive Suspension Leaf Spring Enhancement Kit - HD # RAS3611-CHD, it is important to note that this kit is not designed to increase your available weight capacity on your 2020 Silverado 3500HD with a 3,700 pound cargo capacity. With that being said, the kit will definitely provide the benefits of reducing sag, reducing dangerous sway, and improving overall control. The added support of the # RAS3611-CHD with the 3,400 pound vertical weight...
    view full answer...
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  • Best Suspension Enhancement For 2020 Chevy Silverado 2500 Towing 5th Wheel That Wont Affect Ride
    The best option for suspension enhancement for your 2020 Chevy Silverado 2500 that won't affect your ride is the RoadActive Suspension (RAS). This kit will offer support to your Chevy's suspension only when there is weight applied to it, like when you are towing your 5th wheel trailer. This is called an "active system" which continually reinforces your leaf spring suspension; what that means is the force normally put on your Chevy's current leaf springs will be transferred to the RAS kit,...
    view full answer...
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  • RoadActive Suspension or Timbrens For 2011 Chevy Silverado 2500HD Towing 12k 5th Wheel
    Hi Randy, Between the Timbrens and the RAS, easily the best choice is the RoadActive suspension, though keep in mind there are a couple different fits for your 2011 Chevy Silverado 2500 depending on if you have overload springs or not: - WITH Overload Springs: RoadActive Suspension Custom Leaf Spring Enhancement Kit # RAS3611-CHD - WITHOUT Overload Springs: RoadActive Suspension Custom Leaf Spring Enhancement Kit # RAS3611-HD The reason I like the RAS kit more than the Timbrens is because...
    view full answer...
  • Recommended RoadActive Suspension Kit For A 2022 GMC Sierra 2500 With An In Bed Camper
    Though it will ultimately depend on how much your camper weighs and how much sag you experience, there are a few differences between the 3 options available for your truck. First is the # RAS3611. This will have a 2,000 pound weight capacity and will be used in mild to moderate cases of sagging. With you having a Sierra 2500, I assume you will have a pretty heavy camper in the bed, so this may not be the best option. With that said, we come to the # RAS3611-HD and # RAS3611-CHD. These...
    view full answer...
  • Will the RoadActive Suspension Work on a 2017 GMC Sierra 3500 with Overload Leaf Springs
    The extra leaf springs you are referring to are called overload leaf springs. The RoadActive Suspension Custom Leaf Spring Enhancement Kit part # RAS3611-HD will not work with overload leaf springs but the RoadActive Suspension Custom Leaf Spring Enhancement Kit part # RAS3611-CHD will as it is designed specifically for this purpose. I have attached a review video for you.
    view full answer...
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  • Suspension Enhancement Recommendation for 2024 Chevy Silverado 2500 with Overload Springs
    What you have on your 2024 Chevy Silverado is factory overload springs so the best suspension enhancement kit solution we have would be the Roadactive kit part # RAS3611-CHD. The RAS kits provide an easy install, easy adjustment of support, improved ride quality loaded and unloaded, and also improved stability and handling. Most suspension kits are known to be harsh which is why the RAS kits are what I recommend.
    view full answer...
  • Best Suspension Enhancement for 2015 GMC Sierra 3500 with Camper in Bed
    Using a spacer kit like the # T68MR to allow one side of the truck's suspension to engage sooner will give you more support on that side but since it's hard to say if that will happen to be the sweet spot you are looking for in terms of support it's not what I would recommend as an ideal solution. The best suspension enhancement solution I can recommend would be the RoadActive Suspension Kit part # RAS3611-CHD which is easily adjustable in support on both sides, installs very easily, and...
    view full answer...
    Image 1 for
  • Recommended Suspension Enhancement for 2022 Chevrolet Silverado 2500 Towing a Horse Trailer
    The RoadActive Suspension Custom Leaf Spring Enhancement Kit will be a great choice for your 2022 Chevrolet Silverado 2500. Since you're going to be towing a heavy horse trailer, I recommend using the heavy duty kit # RAS3611-HD instead of the the # RAS3611. The RAS system turns your vehicle's factory leaf springs into a mechanically active suspension system. Not only will this improve stability and control, it will also help prolong the life of your leaf springs, shocks and tires. This...
    view full answer...
  • Will Roadactive Suspension Help 2016 GMC Sierra 3500 Dually Raise Back End of Truck
    Hey Kevin, Good question, and your 2016 GMC 3500 dually will be raised just by adding the RoadActive Suspension Custom Leaf Spring Enhancement Kit # RAS3611-CHD. The # RAS3611-CHD will raise the back end of your truck by an 1" to 1-1/2" so you don't have to add a lift unless you want to raise it up a bit more than that. Otherwise, if you do want more lift, just make sure it won't interfere with the leaf springs where the RAS kit installs.
    view full answer...
  • RoadActive Suspension Kit for a 2020 GMC 3500 SRW 4WD w/ Factory Overload Springs
    For your 2020 GMC 3500 SRW 4WD you're going to want the RoadActive Suspension Custom Leaf Spring Enhancement Kit - Heavy Duty item # RAS3611-CHD. This kit has the extra spacers for the factory overload springs which is what I think you are referring to. This kit installs quickly and is easily adjustable. This system also does not affect your ride quality like other systems do.
    view full answer...
  • Recommended Helper Spring Solution for 2020 Chevy Silverado 3500 With Slide In Camper
    Actually, as long as your 2020 Chevy Silverado 3500 isn't a dually, the RoadActive Suspension # RAS3611 would counteract the rear sag thus leveling out your ride and would reduce sway and body roll, so it would be the perfect solution. If you have a dually with top overload springs, you'd want to use the # RAS3611-CHD instead. I've linked to a video showing a typical install for you.
    view full answer...
  • Recommended Rear Suspension Enhancement For 2021 Chevrolet Silverado 3500 Towing 5th Wheel Trailer
    The Timbren Rear Suspension Enhancement System # TGMRCK25D you were looking at are confirmed to fit your 2021 Chevrolet Silverado 3500 towing a 16000lb 5th wheel trailer and will offer plenty of support, but will leave you will a very stiff ride when the truck is unloaded. Instead the best option is an air helper spring kit like the Air Lift LoadLifter 5000 Air Helper Springs - Rear Axle # AL57341 which will provide up to 5000lbs of load leveling support when you are towing, but can be...
    view full answer...
  • Selecting The Correct RoadActive Suspension System For a 2024 GMC Sierra 2500
    First you will need to determine if you have an upper or lower overload spring on the leaf springs for your 2024 GMC Sierra 2500. If you have a top overload spring you will need the Kit # RAS3611-CHD. Otherwise we have the 2,000LB # RAS3611 or 3,000LB # RAS3611-HD for trucks with lower overload springs. For selecting the correct weight rating I recommend using the 2,000lb kit for occasional loads and the 3,000lb kit if your truck constantly carries heavy weights.
    view full answer...
  • Which RoadActive Suspension Kit is Best for 2024 Chevy Silverado 2500HD
    The Roadactive Suspension kits are the best suspension solutions around for additional support. So for your 2024 Chevy Silverado 2500 you would want the # RAS3611-HD if you do not have the factory overload springs or the part # RAS3611-CHD for if you do have them. The RAS kits give you the support you want, have an easier install, are easily adjustable, but most importantly they improve handling and ride quality loaded and unloaded while requiring zero maintenance.
    view full answer...
  • Suspension Enhancement Recommendation for 2003 Chevy Silverado 2500 HD 4WD
    You would get suspension support for your 2003 Chevy Silverado 2500HD with a Timbren setup but the ride quality will be pretty harsh so I have a different route I'd recommend first with the RoadActive Suspension System part # RAS3611-CHD for if you have factory overload springs or part # RAS3611-HD for if you do not. This will give you all of the same support as the Timbrens but will improve the ride quality and handling unlike the Timbren which will be pretty harsh. Now if you were to...
    view full answer...
  • Difference Between RoadActive Suspension Kits For A 2022 Chevrolet Silverado 2500
    When installing The RoadActive Suspension Kit on your 2022 Chevrolet Silverado 2500 the difference between the HD and the CHD is that the # RAS3611-CHD fits vehicles with overload springs whereas the # RAS3611-HD fits versions without the overload springs. For even better sway reduction and handling improvements, you can use the Roadmaster Rear Anti-Sway Bar # RM25FR with either kit mentioned above. If you have any further questions please feel free to reach back out to me anytime and...
    view full answer...
  • Difference Between RoadActive Suspension Kits for 2020 GMC Sierra 2500
    For your 2020 GMC Sierra 2500 the difference between the HD versions of the RoadActive Suspension kits is that the part # RAS3611-CHD fits vehicles with overload springs whereas the # RAS3611-HD fits versions without the overload springs. These kits would work great with a rear sway bar like the # RM25FR as well. The two kits together would offer really great sway reduction and handling improvements.
    view full answer...
  • Best Suspension Enhancement Recommendation for 2021 GMC Sierra 2500HD
    The RAS systems like what you asked about are the best all-around suspension enhancement for your 2021 GMC Sierra 2500 with the part # RAS3611-HD for if you do not have the factory overload springs or the # RAS3611-CHD for if you do. This kit unlike other options gives you the support you want without any compromises. Other kits will affect ride quality (loaded and unloaded) whereas this actually improves ride quality. It's also easily adjustable, installs easily, and also acts almost like...
    view full answer...


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Info for this part was:

Employee Leah B
Edited by:
Leah B
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Expert Research:
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Employee Chris R
Video Edited:
Chris R
Employee Mary K
Written by:
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