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RoadActive Suspension Custom Leaf Spring Enhancement Kit - Heavy Duty
RAS

RoadActive Suspension Custom Leaf Spring Enhancement Kit - Heavy Duty

Part Number: RAS34FR
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 RAS34FR can be ordered online at etrailer.com or call 1-800-940-8924 for expert service.
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RAS Vehicle Suspension - RAS34FR

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



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

Installation Details RAS34FR Installation instructions

This Product Fits The Following Vehicles




Customer Satisfaction Score:


Customer Reviews

RoadActive Suspension Custom Leaf Spring Enhancement Kit - Heavy Duty - RAS34FR

Average Customer Rating:  4.7 out of 5 stars   (68 Customer 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.

by:

2020 Tundra install that is supplementing a full Icon suspension including upgraded leaf springs. Easy installation process and completed by myself in a short afternoon. Definitely can tell a positive difference in handling even with no load. Pulling the trailer tomorrow to see the real benefits!

Gwendolyn Y. profile picture
Etrailer Expert

Gwendolyn Y.

12/17/2024

Hey Nathan, let me know how to tow goes and how you like the handling.



by:

Would like a new pair as the overall look of my RAS now makes my truck look very dingy, besides not sure how it’s possible but seems like one spring is kind of stretched out.



by:

My third set. F-110, F-250 and a Tundra. I use the F-250 to pull a 42’ Fifth Wheel RV. 2300 Lbs.tongue weight. Barely lowers the truck compared to without the enhancement kit. It feels like 300 Lbs. Still have a great ride when not towing and without a load.



by:

Great product and amazing service from etrailer. My order arrived a day early. Instructions in the box were specific to my vehicle which was key, all of the videos online are for other trucks. Install was simple, took less than an hour. Gave me 1 1/2" of lift in the rear, and oddly the front was 1/2" higher after install. My truck rides and handles noticeably better. Looking forward to towing my trailer.



by:

I just finished installing this kit and the installation was very simple and smooth. I did take it for a no-load test run, and could tell the change. Can't wait to see how it does with a load, (my Quad).

Tony profile picture

Tony

4/20/2022

This a great product, it truly helps the suspension of my truck, both with or without a load..works great!



by:
Toyota Tundra

This product did exactly what we wanted. Our Toyota Tundra suspension was lacking and sagged; this product brought the truck back to no sag while pulling our travel trailer.



by:
Pontiac Trans Sport Van

When I ordered this, I was moving some 300 bricks 90 miles. When I first got the bricks, it didn't take too many any the bed of my truck before it was hitting bottom. So after transporting them to my place 1st, I decided to find helper springs. This set I decided on, although was a bit more than I wanted to spend, I am glad I did. They were super easy to install myself in under an hour. Was able to transport more bricks in one trip vs several trips when I 1st got them. I would recommend this type of spring support to anyone. Theyvdobraose the back up a tad, but that is to be expected.



by:
2021 Toyota Tundra

Was very easy to install on my 2021 Toyota Tundra , I cant wait to see how it does when I haul a Heavy load.
Lifted the rear up an inch.
Drives even smoother than it already did.



by:
2011 Toyota Tundra

Easy to install and unloaded I can already tell a difference



by:
Toyota Tundra

Good quality, easy to install. A great addition to our Toyota Tundra.



by:
2019 Toyota Tundra

Ordered the wrong one accidentally and placed a new order for the correct one. Within minutes I was contacted by customer service with instructions on how to return the first order, and the new one was shipped just a couple of hours later. Awesome customer service and one of the reasons I'll come back



by:

Install went smooth, hooked it up and it made a difference to my overland rig when fully geard up . Even kept the articulation in the rear.



by:

RAS has worked well on the Tundra towing a 27ft Airstream GT.



by:
2018 Toyota Tundra

Etrailer was very helpful on the ordering and shipping of the RAS suspension assist.
I have not installed yet that will be completed tomorrow, will write a follow up in a few weeks. Pictures 9f install will be added at next review.

Anthony profile picture

Anthony

4/15/2023

Great, the RAS has worked just as they describe. A more stable ride while pulling the camper, smoother while hauling a payload. Very pleased with the product



by:
2013 Toyota Tundra

Wow....What a difference! First off, the etrailer crew was fantastic and my order arrived a couple days early. The wife and I were scheduled to go camping the week following Thanksgiving and I wanted to install the RAS before we left so I could see if it lived up to the hype. It arrived the day before Thanksgiving while I was at work which gave me 2 days to attempt to install these on my 2013 Toyota Tundra. It took approximately 90 minutes to install......And I'm very meticulous about these things!! I had a little hiccup trying to extend the threaded rod, but etrailer support set me straight - On Thanksgiving!!! I took the beast out for a test drive and was amazed at the difference in the ride. I set them at 45% or the 2mm disk spacing and my truck rode like it was on rails. No more sway or body roll, even my wife noticed the difference! She said "I don't have to grab the Oh Sh!t handles anymore!" 2 days later we loaded up our travel trailer, a 30' trailer that weights about 8,000 lbs, and took off. The ride was sooooo much better. Very little sway from passing trucks, it was less bouncy, and we handled the corners much better. I highly recommend this product!

Michael B. profile picture

Michael B.

12/7/2021

So far, so good. Still loving this product



by:
2019 Toyota Tundra

Added a Roadmaster Active Suspension Kit to my 2019 Tundra to reduce squat when towing my Travel Trailer with the fresh water tank full. The extra 400 lbs of water adds a lot of tongue weight. My experience with e-trailer is that they always ship “freaky fast”. As usual, my order was at my door in just a few days. The Roadmaster Active Suspension kit was nicely packaged with very good instructions. All components were well designed and manufactured. Installation went smoothly.

Dave profile picture

Dave

2/10/2022

When originally installed, I adjusted these to the highest setting. That was more than I really needed. Backed it down to the lower setting. I get all the ride height control I need along with a better ride. Body roll, axle wrap and all the other unsettling gyrations are eliminated. Buy these, put em on and forget em.



by:
Toyota Tundra

I own a Toyota Tundra what suffers from the famous "Toyota Sag". After much research, I landed on the RoadActive Suspension. I considered a simpler solution (think bump stop), but I had that on a previous truck and I wasn't fully satisfied with the outcome for the investment. The package arrived on time and in good condition. The kit looks very sturdy and seems like it will be easy to install. I'm planning on installing it this weekend. Time will tell.



by:

fast delivery and they really helped with the swaying .



by:

Added these to my 2016 Tundra in preparation for towing my 24 foot travel trailer around the country. 15 states and who knows how many miles I am so happy with them. I don’t have a distribution hitch and the truck tows so well. Without the trailer bumpy roads aren’t harsher than before, and there’s a minor improvement to handling.

So glad I didn’t get air bags and got these instead.



by:

Stiffened up the rear of the truck considerably. Minimized trailer drop when hauling my camper, and has improved the ride stability when hauling around dirt and rocks. No more tire squish or taking it easy for this Toy. Excellent product, well designed, and easy to install on the driveway.

Tim profile picture

Tim

4/7/2023

Still working wonderfully. No sag, rear sticks to the road when cornering, can hardly tell when youve got a load or are towing a trailer. Even pulled my buddys 28 Cougar trailer with no issues. Excellent product, and love the adjustments.



by:

Easy to install. Provided the extra lift I needed when towing yet very little change in roughness when not towing.

Mallory profile picture

Mallory

8/11/2023

This product was a great choice. After a month or so I adjusted the spring tension and now it just does its job without any maintenance or inspection as needed with air bags. Very happy with this choice!



by:
2017 Toyota Tundra

Delivery a day early, install in less than two hours. Raise rear end of truck 1" at fender well and 1.5" at hitch. Will follow up after pulling a 6500 lb boat and trailer.



by:

Installed RAS34FR on 2016 Tundra 2WD used to tow an RV Trailer with an 800 lb tongue weight (truck rated for 1000 lb). The Blue Ox hitch system we use sets ball behind rear bumper about 14" putting significant leverage disadvantage on truck, and even with weight distribution set up pretty high, truck rear squats way too much.

I really like the RAS system for many reasons including: relatively easy installation, less hassle once installed compared to air bags, minimal impact on truck ride loaded and/or unloaded, expect system to be durable over the long haul, no need to fuss with pressure adjustments of air bags, and ability to easily "self tune" amount of added support in unlikely event you may choose to alter it.

I will continue using system in towing our 4 ton RV trailer as well as doing typical home owner hauling. The RAS system ( the 3000 lb capacity option) set up for 40% assist has made a world of difference towing the RV. Truck now sets level even without heavy torque set on bars of Blue Ox hitch. Handling is back to normal; no sway, front of truck elevation neutral VS pitched upward, ride is good.

Please note that at the initial set up listed above, truck does set up about 1-1/2" higher when empty and ride is just a bit more stiff compared to stock (no RAS) ride. I may choose to back down on 40% assist level a bit in future to resolve these issues which are minor in my judgement.

etrailer service from Christina J was excellent. Shipping was trouble free and prompt. Communications were timely and to the point. Although the RAS price is high, overall I feel that I got what I paid for - a product that delivers the performance it brags about. eTrailer listing was accurate and helpful. It appears the RAS product reviews are legitimate VS the obvious fake ones you get on some other popular sites.

I recommend the RAS product and feel potential buyers can trust it will deliver within it's specifications for you.



by:
2017 Toyota Tundra

Well worth the money installed it on my 2017 Tundra when I’m not towing I can’t tell they are on when I’m towing makes a huge difference I have them in addition to a set of timbren bump stop on my rear suspension they compliment each other great when towing highly recommend both.



by:
2014 Toyota Tundra

Just completed a 900 mile trip towing my 26 ft travel trailer with a 2014 Tundra. The RA suspension kit made a noticeable difference in the feel of the vehicle while towing with less vehicle sag. I adjusted the kit to the lower of the two settings and notice little difference in ride when unloaded. The truck does set an 1 1/2” higher in the rear. I also use an equalizer hitch w/sway control while towing. The kit performs as advertised and was not terribly difficult to install.


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See what our Experts say about this RAS Vehicle Suspension

  • Is SumoSprings or RoadActive Suspension Better For 2008 Toyota Tundra
    For your 2008 Toyota Tundra, between the SumoSprings Solo Custom Helper Springs # SSR-610-54 and the RoadActive Suspension (RAS) Custom Leaf Spring Enhancement Kit # RAS4611TD, the better overall system is the RAS # RAS4611TD. The reason for that is the RAS is an active system which continually reinforces your Tundra's original leaf spring suspension. The force normally put on its leaf springs, either when carrying cargo or towing a trailer like you are, gets transferred to the RAS Enhancement...
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  • Recommended Alternative to Air Bags on 2017 Toyota Tundra
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  • Best Rear Suspension Enhancement Recommendation for 2010 Toyota Tundra Double Cab with Camper
    Hey Joe, the best suspension enhancement kit we offer for your 2010 Toyota Tundra is the Roadactive kit part # RAS34FR. This is easy to install, maintenance free, and improves ride quality and handlining loaded and unloaded which is basically unheard of. The best bang for your buck is the Hellwig EZ-990 # HE86VR which has by far the best price. It basically adds a leaf to your rear suspension for more support. If you are wanting something that costs less and will do an excellent job but...
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  • Best Suspension Enhancement System for a 2021 Toyota Tundra For a Self-Install
    I have a great suspension enhancement system that you can install on your 2021 Toyota Tundra. The RoadActive Suspension Custom Leaf Spring Enhancement Kit # RAS34FR is going to be a great option to improve your vehicle's stability, handling, and control while you are towing or hauling, as well as when your vehicle is unloaded. 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,...
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  • Will the RoadActive Suspension for a 2017 Toyota Tundra Affect Payload
    The RoadActive Suspension Custom Leaf Spring Enhancement Kit part # RAS34FR for a 2017 Toyota Tundra has a pre-load after installation so it would be considered sprung mass. It essentially becomes part of the leaf spring. They however will not increase payload. In regards to braking, the affects would be marginal but the pre-load will place more weight towards the front axle where the majority of the braking force will be.
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  • Can RAS34FR RoadActive Suspension System Be Used Along With Weight Distribution
    The US- made # RAS34FR RoadActive Suspension kit is a fit for your 2006 Toyota Tundra and would be an excellent addition to augment your rear suspension and to improve your ride quality whether the truck is loaded or unloaded, towing or not. The system will work along with your Equal-i-zer weight distribution system to level out your ride height between the front and rear axles and will also help prevent axle wrap and wheel hop. You'll want to be sure to repeat the set-up procedure for...
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  • Suspension Enhancement Recommendation for 2016 Toyota Tundra 4WD Towing Trailer
    I have a really great solution to give you additional suspension support and will also improve the ride quality and handling the RAS systems like the part # RAS34FR that fits your 2016 Toyota Tundra. I wouldn't recommend front suspension enhancement for your setup. That would most likely actually make the ride quality harsher. Any of the other rear suspension enhancement options would also make the ride quality a bit rougher as well so that's why I would not recommend them for you.
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  • Will The RoadActive Suspension Work With 2" Lift Block On a 2018 Toyota Tundra?
    Since the RoadActive Suspension Custom Leaf Spring Enhancement Kit # RAS34FR only connects to the rear leaf spring on your 2018 Toyota Tundra it will still work with the 2" block you have between the leaf spring and the axle.
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  • Can You Install Both SuperSprings and SumoSprings on a 2016 Toyota Tundra
    I do have an option for but SumoSprings Solo Custom Helper Springs like part # SSR-610-54 and SuperSprings Custom Suspension Stabilizer and Sway Control Kit part # SSA4 won't work together on a 2016 Toyota Tundra since they both mount in the same location. If you need more support, I recommend removing the SuperSprings Custom Suspension Stabilizer and installing the RoadActive Suspension Custom Leaf Spring Enhancement Kit part # RAS34FR which is very similar but provides almost three times...
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  • Recommended RAS Suspension Enhancement For 2010 Toyota Tundra 5.7L 2WD Towing 8000lb Travel Trailer
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  • Do I Have To Remove The Leaf Spring Eye Bolt To Install?
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  • Rear Suspension Enhancement Recommendation for 2021 Toyota Tundra Hauling a Toy Hauler
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  • RoadActive Suspension Recommendation for 2021 Toyota Tundra 4WD
    I recommend picking up the RoadActive Suspension Custom Leaf Spring Enhancement Kit # RAS34FR for your 2021 Toyota Tundra TRD Sport, 4WD since it has the higher 3,000 lb weight rating as opposed to the 2,000 lb rating for the RAS Kit # RAS4611TD. This just means you'll have a higher support system so you can ensure the suspension on your new truck will have the most help possible which, in turn, means your suspension will have less wear and tear.
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  • Will The RAS Suspension Enhancement System Work On A 2019 Toyota Tundra With Icon Leaf Springs
    Hi Tim, Yes, the RoadActive Suspension Custom Leaf Spring Enhancement Kit # RAS34FR would still work with your Icon aftermarket leaf springs. This system simply clamps to the leaf spring stack at the center and the opposite side eyelet to act as an extra leaf spring on the stack and provide more support for heavy loads.
    view full answer...
  • How is the RAS System Different From Add-A-Leaf System for 2001 Toyota Tundra
    An Add-A-Leaf kit differs from the RoadActive Suspension Custom Leaf Spring Enhancement Kit # RAS34FR for your 2001 Toyota Tundra in that the Add-A-Leaf is literally just adding another leaf spring to your spring stack to help make it a little more robust where the RAS system is a little more "smart". It has a spring that helps to provide constant tension and you can adjust it some for more of a relaxed or stiffer ride quality. So instead of just making your leaf spring stack thicker...
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