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  1. Vehicle Suspension
  2. Ford
  3. F-250 and F-350
  4. 1995
  5. RAS
FITS 1995 Ford F-250 and F-350
RoadActive Suspension Custom Leaf Spring Enhancement Kit - Heavy Duty

RoadActive Suspension Custom Leaf Spring Enhancement Kit - Heavy Duty

Item # RAS3611-SLHD
Our Price: $589.00
Vehicle Suspension
Confirmed to Fit
1995 Ford F-250 and F-350

F-250

F-350 - Pickup

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The best technical support and full vehicle suspension installation instructions. Great price F-250 and F-350 vehicle suspension and expert service. Ford F-250 and F-350, 1995 vehicle suspension by RAS are available from etrailer.com. For expert service call 1-800-940-8924 to order your RoadActive Suspension Custom Leaf Spring Enhancement Kit - Heavy Duty part number RAS3611-SLHD, or order online at etrailer.com.
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1995 Ford F-250 and F-350 - RoadActive Suspension Custom Leaf Spring Enhancement Kit - Heavy Duty

  • Leaf Springs
  • Rear Axle Suspension Enhancement
  • Heavy Duty
  • RAS

3,000-lb Capacity. Convert your Ford F-250 and F-350'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-SLHD RAS Custom HD Active Suspension System for OEM Leaf Springs - Rear Axle

3611SL-HD

Installation Details RAS3611-SLHD Installation instructions

Customer Satisfaction Score:


Customer Reviews

RoadActive Suspension Custom Leaf Spring Enhancement Kit - Heavy Duty - RAS3611-SLHD

Average Customer Rating:  4.7 out of 5 stars   (733 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:

Really like this product. Was super easy to install and instructions were easy to read. Amy was very helpful in recommending the correct part and even took the order for me. Its winter here in the Rockies so I haven't had a chance to test out the load of my 5th wheel, but the ride still feels smooth. I have ordered from etrailer before and always have a good experience. Choose them with peace of mind.



by:
2021 Ford F-250 Super Duty

So far I like the product it comes with good instructions and easy to install . Also the ride of the truck is better than the airbags I had a lot smoother and not so bouncy .



by:
2017 Nissan Leaf

This is the 2nd pair I purchased. My first was for a 2017 Ford F150 and the
first thig I did when I purchased my 2021 F250 Super Duty was to get a pair for that truck. I don't know that I will ever have a truck without a Leaf Spring Enhancement Kit.



by:

I use it with my Timbrens and it give the truck a great ride when not towing. It also seems to help the Timbrens with a relaxed reflex response to dips and bumps when towing. I'm very happy with it.



by:
2020 Ford F-250 Super Duty

Well I just installed them today so I went ahead and loaded my excavator just to see how much the rear of my truck squatted and it didn’t squat near as much as before, I’m pulling 16000 lbs trailer and excavator with a 2020 F250 super duty and before I installed I normally would have to park my excavator in just the right spot to give me enough tongue weight that I needed but I always had that seat of the pants feeling that I didn’t like while towing it, drove down the road with everything installed and loaded and it honestly felt like a completely different truck, didnt pull it but about 4 miles but so far so good, think I’ve finally found my solution



by:

I really like these. I have a pair on both my trucks. They don't take away all the bouncing, but they take a whole lot of the bouncing away.



by:
Ford F-150

Great product! It does what it advertises and is a breeze to install on my F-150 but a little harder on the 350 since you have to remove the overload spring. Works great helps keep truck perfectly level when towing my 10k lb trailer. Highly recommend.



by:

Pretty bouncy, not as good as other opt ions.



by:

Installing was not difficult, not as much sag when connected to 1080lb tongue weight trailer



by:
2016 Ford F-250 Super Duty

Great improvement. Much more stable and level towing my 8000 pound travel trailer with my 2016 F250.



by:
2014 Ford F-250 Super Duty

Made a huge difference in the way my truck sits with a 12,000 lb. RV on it



by:

Outstanding quality fast delivery.



by:
2021 Jayco Jay Flight SLX Travel Trailer

Install took about 30min. Seems my rear is a hair higher at 25%. Going to tow 7k about 650mi this weekend. See how much if helps.



by:
2019 Ford F-250 Super Duty

Easy install and really reduced squat!



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2017 Ford F-250 Super Duty



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2019 Ford F-350 Super Duty



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2016 Ford F-250 Super Duty



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by:

I received this kit in a very timely manner always do from etrailer have some issues with the instructions that come from roadmaster not a trailer the bump stop spacer didn’t say that you need to use the original bolt from the bump stop so it slowed me down greatly on the install however I took it out on a quick run without a load I do feel that this has made the unloaded ride smoother tomorrow I’ll be taking the trailer out for a bit and we’ll see how it works there and I’ll update this rating.



by:

Admitedly, I haven't even rolled my '07 Silverado 2500HD classic out of the garage yet, but I'm already very pleased. I had to go to a neighbor for a 10mm hex key socket and was slowed down by my 7yo kid 'helping', but it was still only 90 minutes my jack stands were in use. Easiest thing to do!
My only small downsides so far:
* needed to find a 10mm hex key that I apparently don't own, not sure why they picked that fastener
* wish I put some loc-tite on; just to make me feel better
* distance to drop the axle so the suspension fully hangs was way further than I expected; barely had my jack stands tall enough to get the job done.

These aren't really bad on the product, just notes for future customers. We're towing the 5er about an hour an a half this coming week, hopefully it steadies up a lot!



by:

Overall, very happy with the product. GMC didn't have any way to improve the truck from squatting when I hooked up my trailer. This kit didn't stop the squatting but significantly reduced the bounce on bad dips in roads, bridge/road transitions and bad railroad crossings.


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Show More Reviews

See what our Experts say about this RAS Vehicle Suspension

  • Suspension Enhancement for 2012 Ford F-250 to Reduce Sag
    If the stock suspension of your truck is sagging without a load in the bed of the truck that would indicate you have worn out suspension and would need to fix that with replacement components. You can't use suspension enhancement as a bandaid to fix bad suspension. Now with that said the best suspension enhancement for your 2012 Ford F-250 is the RAS kit part # RAS3611-SLHD which gives adjustable suspension support that is easily adjustable and will get rid of sag from towing/cargo weight....
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  • Recommended Suspension Enhancement For 2017 Ford F-350 DRW To Prevent Sway From Truck Bed Camper
    I would be happy to help! Since you are not getting much if any sag when carrying your truck bed camper in your 2017 Ford F-350 Dual Rear Wheel I recommend going with the RoadActive Suspension Leaf Spring Enhancement Kit # RAS3611-SLHD if your truck has the upper overload springs, or the # RAS3611-SHD if your truck does NOT have the factory upper overload spring. These kits will add 3000lbs of load leveling support, but more importantly are the best option for reducing sway and body roll...
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  • Best Suspension Enhancement for 2021 Ford F-350 Towing Fifth Wheel
    For your 2021 Ford F-350 that has some sag when towing a fifth wheel the best option for additional support that won't hurt your loaded or unloaded ride quality is the RoadActive Suspension kit part # RAS3611-SLHD for if you have factory overload springs or part # RAS3611-SHD for if you do not have them. This kit gives you the best of all worlds as you get adjustable support, an easy install, and improved ride quality and handling. Most kits you basically get to pick one of those things...
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  • Best Suspension Enhancement for 2020 Ford F-350 Towing Fifth Wheel Trailer
    The RAS systems are by far the best suspension enhancement option for a truck like your 2020 Ford F-350 towing a fifth wheel trailer. You get (adjustable) suspension support which greatly reduces sag, you get improved stability and reduced sway, but unlike other options that make the ride quality rougher these actually are known to improve the ride quality. So if your truck has factory overload springs you'd want the part # RAS3611-SLHD and if you don't have them # RAS3611-SHD.
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  • Recommended Rear Suspension Enhancement For 2020 Ford F-250 4WD Lowered 2
    The Firestone Ride-Rite Air Helper Spring # F35FV you were looking at for your 2020 Ford F-250 4WD is designed for trucks at the factory ride height and will not work once you lower it 2" by removing the factory 2" lift block. If you choose to lower your truck you will not be able to run any air helper springs as none are designed to work on lowered trucks. Instead your best bet would be going with the RoadActive Suspension Custom Leaf Spring Enhancement Kit - Heavy Duty # RAS3611-SLHD...
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  • Recommended Suspension Enhancement For Occasional Towing For 2021 Ford F-350 SRW
    Suspension enhancement is a very good idea for your 2021 Ford F-350, even with just occasional towing, but especially for longer trips as your truck will be easier to handle with a more level ride. What I highly recommend for your F-350 is the RoadActive Suspension, with the correct option depending on if you have top overload springs or not: - WITH Top Overload Springs: RoadActive Suspension Custom Leaf Spring Enhancement Kit # RAS3611-SLHD - WITHOUT Top Overload Springs: RoadActive...
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  • Suspension Enhancement for 2018 Ford F-350 that Improves Ride Quality
    Timbrens are known to make ride quality harsher so if you are looking for smoother ride quality that would not be what I would recommend. There's only one suspension enhancement kit I can recommend for your 2018 Ford F-350 that is known to make the ride quality smoother and that is the RoadActive Suspension Kit like the part # RAS3611-SLHD for if you have a dually or the part # RAS3611-SHD for if you do not have a dually.
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  • Will Air Bags Work On a Lifted 2017 Ford F-350
    The correct Firestone Ride-Rite Red Label Extreme Duty Air Helper Springs for a 2017 Ford F-350 is part # F42ZR. That said, these won't work well with most lift kits due to the design of the brackets nor will any air bags on this vehicle. If you have a lift kit installed you'll need to look into different options for support. I recommend the RoadActive Suspension Custom Leaf Spring Enhancement Kit part # RAS3611-SLHD for models with factory overload springs or part # RAS3611-SHD for models...
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  • Suspension Enhancement for 2015 Ford F-350 with In-Bed Camper
    For additional suspension support for your 2015 Ford F-350 with an in-bed camper the RoadActive Suspension kit part # RAS3611-SHD which provides adjustable support that will give you the sag reduction you are wanting but unlike other options increases stability and handling as well as improves ride quality. The other options will give you support but they are known to make the ride quality harsher. If you had a dually truck you'd need the part # RAS3611-SLHD. Front suspension enhancement...
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  • Best Suspension Enhancement 2017 Ford F-250
    The best suspension enhancement by far for your 2017 Ford F-250 towing a heavy fifth wheel trailer is the RoadActive Suspension kits. They give the best stability, support, and unlike other solutions actually improves ride quality. The Timbrens are notoriously harsh so I would not recommend that route for you. So if you have factory overload springs you'd want the part # RAS3611-SLHD or the # RAS3611-SHD if you do not.
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  • Best Suspension Enhancement for 2020 Ford F-350 FX4
    We have really great suspension enhancement that does fit your 2020 Ford F-350 with the RoadActive Suspension kit part # RAS3611-SLHD which does fit the FX4 models due to differences in the suspension but the air bag styles do not fit the FX4 package trucks. The RAS systems are the way to go over air bags anyway. They give you the adjustable support you are looking for, have an easier install, require less maintenance, and actually improve the ride quality whereas air bags tend to make...
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  • Correct RoadActive Suspension RAS for 2016 Ford F-250 with Factory Overload
    The correct RoadActive Suspension Custom Leaf Spring Enhancement Kit for a 2016 Ford F-250 with factory overload leaf springs is part # RAS3611-SLHD. These are designed to be used with factory leaf springs including the overload. They will do a great job of reducing sag therefore improving ride quality and control. They however will not increase towing capacity which is the case for any enhancement kit.
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  • Spring Rate of RoadActive Suspension Custom Leaf Spring Enhancement Kit
    According to RoadActive Suspension the spring rate for the standard kit # RAS3611-S is 2,400 lbs. For the heavy duty # RAS3611-SHD it is 3,600 lbs. The heavy duty # RAS3611-SLHD is the same but only designed to fit if you have factory top overload springs on your 2016 F-250. I did ask if that was the actual pounds per inch measurement since it seems rather high and they weren't entirely sure. I know this measurement correlates with the weight capacity of each so it is probably best to...
    view full answer...
  • What Suspension do You Recommend for My 2022 Ford F-350 Super Duty when Towing a Fifth-Wheel?
    For a great suspension enhancement for hauling your fifth-wheel trailer on your 2022 Ford F-350 Super Duty, I recommend the RoadActive Enhancement Kit # RAS3611-SLHD. This kit will fit 2-wheel and 4-wheel drive models as well as single rear-wheel and dually models. Apart from the kit's 3,000 pound capacity, the leaf spring enhancements greatly extend the life of your factory springs. This is super important to consider if you plan to haul your fifth-wheel trailer often. Also, the leaf spring...
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  • Comparing RAS3611-SHD and RAS3611-SLHD For 2011 Ford F-250/350
    The difference in the RAS kits for your 2011 Ford F-250/350 is the RoadActive Suspension Custom Leaf Spring Enhancement Kit - Heavy Duty # RAS3611-SLHD fits trucks with the top overload springs and can fit dual rear wheel models, where the # RAS3611-SHD does not work with the top overload springs or dual rear wheels. So if your truck has the top overload springs or has dual rear wheels you will need to go with the # RAS3611-SLHD, and if your does not have top overload springs or dual rear...
    view full answer...
  • Suspension Enhancement Recommendation for 2015 Ford F-250 Towing Travel Trailer
    I have a really great solution for but the SumoSprings aren't designed to make contact with axle all the time so that they would be engaged even when unloaded and also there aren't spacers available to allow that to happen so this wouldn't be your best route. Instead I would go with the RoadActive Suspension part # RAS3611-SLHD for if you have factory overload springs or part # RAS3611-SHD for if you do not have them. This is an adjustable system that would allow you to add more support...
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  • Suspension Enhancement Recommendation for 2022 Ford F-250
    Using more than one suspension enhancement kit on your 2022 Ford F-250 is not recommended. It's hard to say if the kits would fit together at same time and also if you are in a situation where you need more than one kit you are probably overloading the suspension. I do have a great solution though with the RoadActive Suspension Kits like part # RAS3611-SLHD if you have the factory overload springs or part # RAS3611-SHD if you do not have them. The RAS kits offer easy to install adjustable...
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  • Will the RoadActive Suspension Custom Leaf Spring Kit Fit a 2022 Ford F-350 Platinum Tremor
    Yes, the RoadActive Suspension Custom Leaf Spring Enhancement Kit # RAS3611-SLHD will work with both the 2022 Ford F-350 Platinum with Tremor package and the 2022 Ford F-350 Platinum without the Tremor Package.
    view full answer...
  • How Does Weight Capacity of RoadActive Suspension Kit Affect Towing Capacity
    The capacity of the suspension enhancement kits we offer for vehicles like your 2017 Ford F-350 is basically how much additional support they can provide to help out the factory suspension of the truck. So the # RAS3611-SLHD can provide up to 3,000 lbs of additional support which will allow your factory suspension to carry the weight easier. This does not increase the capacities of the vehicle though as it basically just gives additional support to carry the current capacity in a safer way.
    view full answer...
  • Recommended Suspension Enhancement for 2022 Ford F-250 With Tremor Package
    I do have a solution, but according to SuperSprings International none of the SumoSprings will fit the 2022 F-250 with the Tremor package. Instead, I recommend the RoadActive Suspension Custom Leaf Spring Enhancement Kit # RAS3611-SLHD. The RAS converts your factory leaf springs into a mechanically active system. It will help keep you level and reduce sway and body roll just like the SumoSprings would. They have a minimal impact on unloaded ride quality and adjust based on the vehicle...
    view full answer...
  • Recommended Suspension Enhancement for a 2019 Ford F-250 4WD
    I have a couple of options to eliminate the sagging in your rear end that will also improve the handling of your 2019 Ford F-250 4WD. It is the RoadActive Suspension System. The reason this is the best for your F-250 is because it is an active system which works to continually reinforce your original leaf spring suspension. Which system you will need is determined by whether or not your F-250 has the factory overload spring. I have attached a picture below that will help you identify whether...
    view full answer...
    Image 1 for
  • Will the Air Lift LoadLifter 5000 Ultimate Air Helper Springs Fit a Lifted 2019 Ford F-250
    The Air Lift LoadLifter 5000 Ultimate Air Helper Springs part # AL88399 will only work on a 2019 Ford F-250 if it has the factory jounce strike plate which is integrated into the factory spacer between the leaf springs and axle. If this is still in place and it's under the factory jounce strike plate/spacer then you would simply need longer carriage bolts, if it's on top then you would need spacers like part # AL52440. If it is not present then you'd have to go with another option like...
    view full answer...
  • Does RAS Leaf Spring Enhancement RAS3611-SHD Fit A 2021 Ford F-250 4WD?
    The RoadActive Suspension Leaf Spring Enhancement Kit # RAS3611-SHD you mentioned will fit your new 2021 Ford F-250 Super Duty 4WD as long as it does NOT have the top overload springs. If it does have the top over load springs you would need the # RAS3611-SLHD instead. I included videos of the products mentioned for you to take a look at.
    view full answer...
  • RoadActive Suspension Kit that Fits 2020 Ford F-250 with Overload Springs
    For versions of the 2020 Ford F-250 Super Duty with the factory overload springs we have the RoadActive Suspension kit part # RAS3611-SLHD as a confirmed fit. This fits your Tremor model.
    view full answer...


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