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  1. Vehicle Suspension
  2. RAS
  3. Leaf Springs and Helper Springs
  4. Towing/Load Leveling
  5. Rear Axle Suspension Enhancement
  6. Standard Duty
THIS ITEM IS NOT A FIT FOR
1981 Chevrolet Van
etrailer Installation
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RAS

RoadActive Suspension Custom Leaf Spring Enhancement Kit

Part Number: RAS3613-GT
In Stock
$539.00
Vehicle Suspension
Not Confirmed to Fit

1981 Chevrolet Van

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etrailer Installation
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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 RAS3613-GT can be ordered online at etrailer.com or call 1-800-940-8924 for expert service.
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  • Reviews (548)
  • Q & A (0)
  • Videos (1)
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RAS Vehicle Suspension - RAS3613-GT

Highlights

  • Custom Fit for Your Vehicle: Mounts to existing attachment points
  • 2,000-lb Load Support: Keeps your truck level and steady when towing or hauling heavy gear.
  • Smoother, Safer Handling: Cuts sway, body roll, and bounce for more control on highways and turns.
  • No Upkeep Needed: Once installed, it works automatically with no adjustments or maintenance.
  • Protects Suspension Parts: Reduces axle wrap and wheel hop to extend spring and shock life.
  • Simple Bolt-On Install: Mounts under your leaf springs with included hardware, no drilling required.
Made in USA

Features to know about

Stay Level When the Load Gets Heavy: 2,000-lb Rear Suspension Support

When towing or hauling, rear-end sag can throw off your steering and braking. The RoadActive Suspension kit adds 2,000 lbs of load support by turning your stock leaf springs into a mechanically active system. As the weight increases, the variable-rated coil tension springs automatically adjust to keep your ride level and stable. That means no more squatting when you tow a trailer or load up the bed—just steady handling and confident control.

RoadActive Suspension kit keeping a truck level under load, showing improved suspension balance and ride stability.

Stop Sway and Body Roll Before It Starts: Active Coil Tension Springs

Sway and body roll can make towing or cornering feel sketchy. Each RAS unit uses a variable-rated coil tension spring that reacts instantly to shifting weight, reducing sway and body roll before they start. The setup strengthens your factory leaf springs so your vehicle stays planted through curves, turns, and windy conditions. You’ll notice less rocking when passing trucks go by and more control when the road bends.

Eliminate Axle Wrap and Wheel Hop: Mechanically Active Design

Heavy loads can twist leaf springs and cause wheel hop that makes your tires lose grip. The RAS design absorbs that extra force, preventing axle wrap and keeping traction where you need it—on the road. That not only improves braking and acceleration but also helps extend the life of your shocks, tires, and other suspension parts.

RoadActive Suspension system preventing axle wrap on a vehicle’s leaf spring setup, improving traction and stability.

Install Once and Forget It: Fully Assembled, Maintenance-Free System

This all-in-one kit comes fully assembled for an easy bolt-on install—no drilling, cutting, or welding required. Once set up, it needs no adjustments or ongoing maintenance. The coil springs have an epoxy e-coat for corrosion resistance, and the brackets carry a salt spray rating of more than 800 hours, so they can handle real-world weather without a problem.

Installed RoadActive Suspension kit attached to a vehicle’s rear leaf spring system, showing simple bolt-on setup for improved stability.

Specs

Weight and Capacity

  • Weight capacity: 2,000 lbs

Warranty

  • Warranty: 5-Year warranty
  • Money-back guarantee: 30-Day money-back guarantee

3613-T RAS Custom Active Suspension System for OEM Leaf Springs - Rear Axle

Replaces RAS 3613



This Product Fits The Following Vehicles




Video of RoadActive Suspension Custom Leaf Spring Enhancement Kit
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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 - RAS3613-GT

Hi everybody, Andy here with etrailer. Let's take a quick look at this Road Active Suspension Custom Leaf Spring Enhancement Kit. Now this kit has been specifically designed to fit your 2003 to 2014 Dodge Ram, both the 2500 and 3500s, then your 2010 and newer Ram 2500 and 3500, both the two wheel and four wheel drive models. Now on 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 you or if we have something comparable that will work for you. Now, when you are towing heavy trailers or carrying heavy loads, nothing's more frustrating than a vehicle that sags or sways.

Now this road active suspension kit is going to transform your standard rear leaf springs into a dynamic support system with a 2000 pound load leveling capacity. So the coil tension springs that you see here, they're going to automatically adjust to your load, maintaining stability and ensuring that your ride stays level and secure. As you probably know, there's nothing more unsettling than feeling your vehicle lurch and hop when accelerating or braking under a load. With the RAS system, axle wrap and wheel hop are going to be a thing of the past. This is gonna stabilize your rear axle by absorbing the load force energy, meaning better control and less wear on your Ram.

Now your trailer's gonna stay in line and that jarring up and down motion on uneven roads is gonna be greatly reduced. And then, maneuvering around tight corners with a loaded trailer, as you know, can be a daunting task when you're battling sway and body roll. This system's gonna reinforce your leaf springs reducing sway and keeping your vehicle stable as you navigate those turns. So no more fearing a shift in your load. You're gonna feel confident and safe knowing that this system's gonna help prevent roll, whether you're towing or simply dealing with windy conditions.

Now, if you are frequently carrying uneven loads, this system is going to provide a solution. With its adjustable coil tension springs, you're just going to adjust the tension settings during insulation to accommodate different load distributions. That's going to ensure that both sides of your vehicle are evenly supported, enhancing handling and safety even with off-center cargo. So you're gonna be able to forget the hassle of air springs or hydraulics that require constant monitoring. This system is going to bolt directly onto your rear axles leaf springs, and once it's on, there are no adjustments or upkeep needed.

This is gonna be a straightforward, robust enhancement to ensure that your suspension always performs its best, whether you're loaded or empty. Now, this again, will give you a 2000 pound capacity, but do keep in mind that this does not actually increase your vehicle's weight carrying capacity, so you wanna make sure that you're not exceeding your manufacturer's recommended weight limits. If you have any other questions, whether it's about this system or anything else that we carry, don't hesitate to reach out to us 'cause we wanna make sure that you're getting exactly what you need. Well, again, my name is Andy. Thank you for joining me.

Ratings & Reviews

4.7

548 reviews
5 Stars
(447)
4 Stars
(66)
3 Stars
(16)
2 Stars
(7)
1 Star
(12)
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by:
2020 Ram 3500
by:
2026 GMC Sierra 1500
Just perfect to level the rear of my GMC 1500 Denali with the 29' Airstream (900 lb tongue wt). Preload is set at 1mm. I tried 2mm and it was overkill for this application. I was pleased with how easy the install was. I had to use a two jack hack to get the rear tires off since my 19" lift floor jack didn't quite have enough reach. You lower the differential after the tires are off so the rear axle is hanging free for the install. See photos
Mike L. profile picture
Etrailer Expert

Mike L.

6/23/2026

Nicely done, Sam! Thanks for the photos, we always appreciate those!

by:
2022 Toyota Tacoma
The install takes about 30 minutes with a floor jack and jack stands. You do not need to remove the center tension bolt just lengthen it out. Lay the assemble over the spring and install one bolt on the ender side. Snug up the spring to desired % of tension and you are good. I did not remove the tires there is no need as you can get to everything. If you can not secure the frame in the upright position with stands I would remove the tires for safety.
The good is the brackets fit nice on the leaf springs and at 25% (the white washer) it lifted the truck 1.5 inches.
The bad is the enhancement bracket that passes by the leaf spring on the drivers side rubs against the brake line hard. I am pretty sure this is an issue with the Tacoma pickups if you look on line. Customer service at etrailer gave me the I don't know you need to contact the manufacturer. Own up and do not pass the buck is my response to that answer. My fix was to loosen the hold down bracket on the brake line under the leaf spring assembly and add 2 washers behind it to move it out away from the plate 1/8 inch. While doing this and before retightening this bracket bolt I also loosened the line bracket bolt fixed to the axle farther to the right and rotated it a little while bending the brake line ever so slightly to create a 1/4 gap between the break line and the enhancement kit bracket when it was tightened back on.
My two cents.
John profile picture

John

9/14/2026

Well It has not failed me yet. Being basically a spring under load all the time I am assuming the spring will stretch some over time and I will have to adjust tension accordingly. The pickup sits nicely on the thinner washer setting so I am leaving it there and hopefully that will help the system last longer.

by:
I don’t think they are really made for the old PU. 1997 k1500 8 ft bed with a 750 lbs camper tong weight I think I had to put to much pressure on the Kurt stabilizer chains to get level. It looked like the newer truck reviews on YouTube were great thanks Dingler.
by:
I purchased the RAS system 6 months ago to help with rear end sag & control while towing our 22 ft 4200lb camping trailer. It improved sag & helped handling even when not towing! I don't get the bounce when driving on bumpy uneven roads the wheels stay planted on the road. I recently purchased a 8000lb camping trailer & my 24 1500 Silverado handles it very well, I will adjust the RAS to the next step up for the extra weight when time permits.
The install took just over an hour with help from a friend & a car lift which is good since I'm 70 years old.
Great product!
Brooke M. profile picture
Etrailer Expert

Brooke M.

6/25/2025

Looks great, Les :) I hear lots of good this about this option for suspension enhancement and how you said, even without towing it can improve the ride quality. Glad to know that you are happy with them, too! do you have any upcoming camping trips planned?

by:
Ford F-150
Installation was very simple. Watched many installation videos and had no issues with installation. Wanted to gain an extra 1 inch in height in the rear on my F-150 while towing my travel trailer and actually gained 1.5 inches in the rear and only lowered the front by 1/4 inch. very satisfied with it so far.
by:
I’ve bought a lot of products from etrailer and as always everyone I dealt with is professional and knowledgeable of the numerous products they sale. I used every resource they offer to help me decide what type of suspension upgrade I was going to use to improve the haul and tow ability of my 2017 diesel chevy Colorado 4x4 crew cab short bed. I chose the RAS system from Roadmaster. I also called them and ask some very detailed questions about using my OEM shackle instead of replacing with the plates in the kit and was told that was fine and that others had also. I got professional and knowledgeable info that helped make my decision. The product is exactly as promoted and every review out there on the internet about how good or unchanged the unloaded ride is after installing are true. My truck rides better now and it was already quieter and almost as smooth as my wife’s Cadillac. If your looking to improve the drive, tow and haul ability of your leaf spring vehicle, and I say vehicle instead of truck because I don’t know if they have them for other leaf spring vehicles, you are not going to find a better easier to install product that does that for your loaded or unloaded vehicle, IMHO. I will update in a year after next spring mulch haul. I don’t expect zero squat but hope to reduce and improve loaded steering performance. Took longer to jack up truck and remove tires than install kit.
by:
Ford F-150
2023 F150. Install was fairly easy. Set at 25%. Ride unloaded a bit stiffer, but handling much better. Lifted rear of truck about an inch. Towing 7500 lb camper down NYS thruway which is crowded with much unforgiving bumps and pot holes the ride was more manageable. The 25+ mph cross winds did make for quite a bit of sway still, not as bad as before adding the RAS. Still felt passing trucks trying to suck me in, not as bad as before.
I plan on cranking the RAS to 40% on next camping trip and hopefully give the RAS 5 stars.
by:
2022 Toyota Tacoma
Easy install when I rotated tires. Forgot to measure height difference, but it did raise a bit. I like the adjustability and not having to remove springs and shackles to add a leaf. Will be towing the camper with improved support.
by:
Helps immensely, 12x6 inclosed trailer from NY to Florida and back up to NJ no problems
Gwendolyn Y. profile picture
Etrailer Expert

Gwendolyn Y.

7/23/2025

That's a long trek, so I'm glad these helped you along the way! Do you take that trip often, Elden?

by:
Nissan Leaf
Great product, helps with sway and when the truck has additional weight it progressively compensates. I would add this to any vehicle with leaf springs.
by:
2011 Nissan Titan
The bed of the truck measured 37.5" with a tool box weighing 200 lbs. The truck felt weighed down with passengers weighing 600lbs. Total weight 800lbs with a tank full of gas. After the install the truck rides smoother and certainly " like new". The stopping distance and acceleration distance have shortened drastically. I'm planning on loading up the bed and the Roadmaster Active Suspension RAS4611. My wife even drive it and she could feel the difference. "It drives like a muscle car." Buy it. Install time at a reputable mechanic shop was a 30 min. Install. I received them today at 1 pm and got it installed at 3:00 pm and finished the install at 3:30pm. It's an investment worth the price over traditional air bag system. Mechanic installed this on 2011 Nissan Titan SV.
Sergio J. profile picture

Sergio J.

8/13/2021

What can I say. After a year of constantly driving through Texas roads and highways. I have moved twice and loaded the bed of my truck plus U-Haul 6x12 trailer and thy truck has not felt the load of it. The Active Road Suspension Leaf Spring is constantly sort of speak sensing if theres load so it can actively push it upwards. I have even driven up to the crazy roads of Pennsylvania and my pick drives smoother than when I got it from the dealer. Im telling you these things work. As any cautious driver upkeeping his own vehicle, I have periodically checked the bolts and location of the resistance in between the spring and it has not deflected or moved from its original installation. I believe every pick up must have these. It beats constantly putting air on the air bags especially in inclement weather like up here in Pennsylvania with the snow. I couldnt be more satisfied with this purchase. Thank you etrailer for offering this superb product.

Sergio J. profile picture

Sergio J.

8/16/2021

Just like when I bought it.

by:
I love the product since i have a 2021 toyota tacoma crew cab long bed with a campertop a robber mat and a jack thats around 450 pounds that a have at all times my truck was sittind low a lilbit plus it was swagging on the road i have summo spring to help my suspention but it was not enoght so i did my research but this was my better option i just installed it yerterday july-8-2021 and went for a ride where i ussually drive everyday and WOW now my truck rides very smood plus it lift my tryck 1 inch on the back now my tryck seats level it took me about 2 hrs but i did right i just follow the intructions and done i love the product the only thing that im concern is that the left side underneat the springleaft there is a breik line that is too close to the roadmaster suspention i hope that with the time dont hit that line because if it does thats the line for the breiks and i will be in trouble replacing it other wise evreything works great i recomend it 100% thanks guys i will buy it again?????best $500 that i spend on my truck
Miguel profile picture

Miguel

7/10/2022

Its been working very well i loaded a couple of times and its awesome

by:
I have a 2020 Silverado 1500 6 cyl Duramax with the Diesel Off Road package (3.73 diff). Travel trailer loaded is probably about 6,000 lb. I took several measurements during and after the spring kit installation. All measurements increased about an inch including the stock suspension with trailer and equalizer bars and with the spring kit installed at 1 mm spacing. A one inch improvement overall. I took the truck on a short drive and didn't notice any difference in ride (wasn't stiffer) which is what I wanted. Good to know that I can adjust the springs to the 2 mm spacing if I want to increase the suspension assist. Going camping next week and looking forward to see how it improves handling and porpoising.
Rick M. profile picture

Rick M.

3/27/2022

After a year I am still pleased with this product. I had been adjusting the spring tension higher when towing and then back down after a trailering trip, but now just leave it adjusted to the trailer towing tension as the unloaded ride doesnt seem to suffer when the springs are tighter.

by:
These made such a difference in the ride of my pick up while pulling my enclosed trailer. Let’s squat more stability.
by:
2011 Toyota Tacoma
Easy install 2011 Tacoma crewcab long bed. Helped with sag when towing microlite travel trailer. Keeps the rear end raised in the rear a little when unloaded, but I like that look. Only complaint and its nothing big when truck is unhooked and empty when i get out I can hear alittle noise from RAS. Sort of like a bedspring coil. Night pic is with RAS installed daylight pic is with out installed
Rich profile picture

Rich

3/10/2021

Still working great. Towed a Flaggstaff microlite 23LB Travel trailer prob between 5 and 5500 LB’s to Niagra Falls with no problems, truck sat level with trailer and 2 adults,2kids. Getting ready to make a 2,000 mile round trip to disney in florida in a few weeks.

by:
2017 chevrolet Silverado
I haven't hooked up my camper yet but set the springs up with the white wafer and it raised my truck 1 1/2 inches which is the amount it dropped after I put on a fiberglass topper. The ride is just a bit stiffer but a lot less body roll I noticed. Not impressed with the 25 Silverado suspension compared to my previous 2017 truck. If the squat is still there after I hook up the camper, there is plenty of adjustment left.
by:
2001 Nissan Leaf
i installed these on my 2001 ford f-250 4x4 and this is a huge upgrade whether your towing or empty.truck rides and handles better than it ever has. easy straight forward installation. you will need a t-55 for the front bolt and a 12mm ratchet wrench for the adjustable bolt that tightens the spring and a couple of 22mm and a 19mm wrench or crescent wrenches for the jam nuts. i took the weight off of the leaf springs for easy adjustment of the coil spring and used the thinner of the two disc that came with the kit and it raised the rear of the truck up exactly 1 inch empty without a trailer connected. if you use the thicker disc it will raise it more.
by:
2017 Ford F-150
I found this items cheaper on another site but etrailer match and then beat the price.
Item installed super easy, more work jacking up the truck and taking the tires off. Can be installed with out removing tires just make it easier to get it in. The item did lift the back of my truck 1 inch. See Pics.
William profile picture

William

3/30/2021

Makes the ride a little stiffer but its a truck. Great when pulling my 37 camper. Helps out a lot!!!!

by:
Did not fit my 1995 F-150. ETrailer was very helpful in an effort to make any adjustments needed. We all decided that they were a "no go" for installation. Return was made easy. I have bought several other pieces of gear since. Thank Etrailer.
by:
I have put these on every pickup that I have owned and not only does it assist with heavy loads, my tires have gone past 80,000 miles before needing replacement. All Chevy Duramax 2500's and 3500's!!
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.
Russell profile picture

Russell

9/2/2023

OMG!! I have done extensive traveling with my trailer over the last year and the RAS system has made a huge difference in sway, road buffeting and squat. I can’t imagine not having this on any vehicle that tows!

by:
ford Ranger
Balances ability to tow my 1800 squaredrop Hiker camper with 350 tongue weight as well as roof top tent on Leer 180 camper topper. Better handles load and side to side tipping on '21 Ranger. Keeps sage to a minimum.
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.
Michael profile picture

Michael

7/7/2023

Removed the Suspension Enhancement and installed Airlift. Cost more but rear-end isnt sagging 4.

by:
Straight-forward installation on a 2007 Pleasure way Excel RV (I did it myself in a few hours) although I did have to modify the air bag mounting bracket with a slot to allow RAS hardware to fit. Great installation instructions. Vehicle height is now correct and could be made level by tension adjustment during install. Handing is improved, I was able to remove aftermarket sway bar which improved ride. I have been considering installation of stiffer rear shocks to soften rebound now that the rear spring rate is increased.
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See what our Experts say about this RAS Vehicle Suspension

  • Difference Between the Kit # RAS3610 and # RAS3613-GT for a 2012 Ram 2500
    Both the RoadActive Suspension Custom Leaf Spring Enhancement Kit # RAS3610 that you ordered and the part # RAS3613-GT that you ordered are confirmed fits for your 2012 Ram 2500. So you definitely didn't order a part that isn't compatible with your pickup. The difference between them is the way they install. The 3610 that you ordered uses a clamp around the leaf spring and secures under the U-Bolt plate while the 3613-GT secures under the leaf spring and around the factory U-Bolts. I...
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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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