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  1. Vehicle Suspension
  2. RAS
  3. Leaf Springs and Helper Springs
  4. Towing/Load Leveling
  5. Standard Duty
  6. Rear Axle Suspension Enhancement
THIS ITEM IS NOT A FIT FOR
2008 Winnebago Access Motorhome
RAS

RoadActive Suspension Custom Leaf Spring Enhancement Kit

Part Number: RAS4622
In Stock
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$539.00
Vehicle Suspension
Not Confirmed to Fit

2008 Winnebago Access Motorhome

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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 RAS4622 can be ordered online at etrailer.com or call 1-800-940-8924 for expert service.
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RAS Vehicle Suspension - RAS4622

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



4622 RAS Custom Active Suspension System for OEM Leaf Springs - Rear Axle

Installation Details RAS4622 Installation instructions

This Product Fits The Following Vehicles




Video of RoadActive Suspension Custom Leaf Spring Enhancement Kit

Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.




Video Transcript for Review of RAS Vehicle Suspension - Custom Leaf Spring Enhancement Kit - RAS4622

Hi everybody. Andy here with etrailer.com. Let's take a look at this RoadActive suspension custom leaf spring enhancement kit. Now this kit has been specifically designed to fit your 1973 to 1983 Ford F-100, F-150, F-250, and F-350. Then your 1984 to 1991 F-150, F-250, and F-350. Then your 1992 to 2002 F-150.

And then your 1997 to 1999 F-150 and 250 Light Duty. Now in custom fit parts such as this kit, I do recommend taking advantage of our vehicle fit guide here at etrailer.com. Just input the year, make, and model of your vehicle and our fit guide will confirm if this will work for your vehicle or if we have something comparable that will work for you. So 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, and bottoming out. When your vehicle is weighed down, your factory leaf springs can't counteract those problems to the extent that they're supposed to.

The weight will overpower the leaf springs and cause them to twist or flatten out. So when that happens, they can't support level or stabilize your truck 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. So this kit will convert your truck's factory leaf springs into a mechanically active suspension system. It will actively strengthen the leaf springs for improved ride quality with or without a load.

And this all-in-one suspension system will improve stability, handling, and control. It's going to eliminate axle wrap, wheel hop, and bottoming out. It will reduce dangerous sway and body roll when you're cornering. And it will even keep your ride level when you're towing or hauling a heavy load, improving your traction while breaking and accelerating. It does use the variable-rated coil tension springs, which will automatically adjust to your vehicle's load.

They activate immediately to support the extra weight and then they'll disengage when unloaded, allowing your leaf springs to perform as they're intended. They can be adjusted during installation to accommodate your towing or hauling needs. They are independently adjustable for side to side leveling of any off-center loads. And these will help extend the life of your leaf springs. Also, your shock absorbers, shackles, and even your tires. These are made here in the USA. They're constructed of durable epoxy coated, epoxy e-coated steel rather. And then the corrosion-resistant brackets on the ends of each of these are going to have a salt spray rating of more than 800 hours. This is going to be an easy bolt-on installation. You're not gonna have to worry about drilling, cutting, or welding. And I have a few pictures there, hopefully giving you an idea of how these are going to install on your truck. These are going to secure under the leaf spring and around the factory U-bolts. So hopefully that gives you a good idea of what the installation's going to look like once they're installed. These are going to arrive in the box just as you see them laid out here on my table. They're gonna be fully assembled. The hardware's included. They're maintenance-free. And adjustments and monitoring aren't going to be needed once they're installed. Now the weight capacity on these is 2,000 pounds. However, an important note to remember is that this kit does not actually increase your truck's weight carrying capacity. So you wanna make sure that you do not exceed your truck manufacturer's recommended weight limit or capacity. Well, I think that's gonna wrap up our quick look today. I do hope that it was helpful for you. Again, my name is Andy. Thank you for joining me.

Ratings & Reviews

4.7

505 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

  • Can a Weight Distribution System be used with a 2016 Grey Wolf Ice House to Reduce Vehicle Sag
    Thanks for your picture, it really helped me answer your question. I would recommend you get a suspension enhancement system for your truck to help with the sag, because the 2016 Grey Wolf will not be able to use a weight distribution system due to its tongue design. There are two types of suspension enhancements I would recommend for your 99 F-150. The first is the Timbren # TFR1525HD. This kit will fit either a 2wd or 4wd F-150 and provide the leveling and stabilization you are looking...
    view full answer...
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  • Suspension Enhancement Recommendation for 2001 Ford F-150 4WD
    SumoSprings does oddly enough exclude the 4WD versions of the 2001 Ford F-150 so you'd have to go a different route for suspension enhancement. Instead I would recommend the Roadactive kit part # RAS4622 as this will give you the adjustable support you are wanting, installs easily, and unlike other options improves handling and stability as opposed to making the ride quality harsher.
    view full answer...
  • Does RoadActive Suspension Kit Add Height to Rear of 2000 Ford F-150
    If your 2000 Ford F-150 is a 2WD you'd want the RAS system part # RAS4612 or if you have the 4WD system the correct fit is the # RAS4622. If you use the less agressive spring setting no height will be added to the height of your truck, but if you crank up the spring tension you might see an inch out back. You would not need replacement shocks.
    view full answer...
  • Will RoadActive Suspension Kit # RAS4622 Fit 2000 Ford F-150 Harley Davidson Edition
    Yes, the RoadActive Suspension Custom Leaf Spring Enhancement Kit # RAS4622 is confirmed to fit and will work well on your 2000 Ford F-150 Harley Davidson Edition. These feature a 2,000 pound capacity and will convert the truck's leaf springs into a mechanically active suspension system. No drilling is required for installation. I have attached a short video demonstration on this system along with the written installation instructions that you can check out as well.
    view full answer...

Do you have a question about this Vehicle Suspension?


Info for this part was:

Employee Mary K
Written by:
Mary K
Employee Wilson B
Updated by:
Wilson B
Employee Noah M
Updated by:
Noah M
Employee Andy C
Installed by:
Andy C

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