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  1. Vehicle Suspension
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  4. Rear Axle Suspension Enhancement
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RoadActive Suspension Custom Leaf Spring Enhancement Kit
RAS

RoadActive Suspension Custom Leaf Spring Enhancement Kit

Part Number: RAS4611TD
In Stock
$539.00
Retail:$589.00
You Save: $50.00
Vehicle Suspension

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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 RAS4611TD can be ordered online at etrailer.com or call 1-800-940-8924 for expert service.
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RAS Vehicle Suspension - RAS4611TD

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

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 braking 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 and eye bracket
    • 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


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

Installation Details RAS4611TD Installation instructions

This Product Fits The Following Vehicles




Customer Satisfaction Score:


Customer Reviews

RoadActive Suspension Custom Leaf Spring Enhancement Kit - RAS4611TD

Average Customer Rating:  4.7 out of 5 stars   (773 Customer 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.

by:
2017 Toyota Tundra

I installed the Road Active suspension standard duty kit on my 2017 Tundra. I was hoping for a smoother ride with and without a load and I was not disappointed. I don’t do heavy hauling, just a center console boat that weighs about 3000 pounds with trailer. My truck definitely has a smoother ride. It is especially noticeable on rough spots like bridge crossings, etc. I set the springs somewhere in between the light and heavy settings. I used a quarter as a spacer. It raised the rear of my truck one inch. I definitely recommend the Road Active suspension and etrailer is the best place to buy it.



by:
2015 Toyota Tundra

Just installed,took about 3 hours. My 2015 tundra would drop 5" when I lowered the trailer, now it only drops 3" and sits level. Did a 15 minute test drive, I felt like the ride over bumps and dips was improved. The only complaint is the installation instructions were very poor.



by:
2018 Toyota Tundra

Very easy to install and make a big difference towing a trailer!



by:

I really like the installation process and the results where good but I do wish I went with the heavier model

Gary profile picture

Gary

5/13/2023

I still wish I went with the heavier modal. But overall it’s a very good product. I just needed a heavier duty version.



by:
2012 Toyota Tundra

Pretty easy install on my 2012 Toyota Tundra. I pull a 25’ airstream front BR travel trailer. It’s got at least a 1,000 # tongue weight. I was sagging in the rear, and getting a lot of porpoising when on concrete sectioned roads. The RAS eliminated the sag, and greatly reduced any porpoising. The truck seems way more planted with the airstream in tow. I’ve even moved it around a bit without the weight distribution bars in place. Truck is level now when towing. I know this doesn’t actually change the payload rating for the Tundra, but it sure changes how it pulls my trailer and hauls heavy loads. I also went to E rated tires.



by:
2013 Toyota Tundra

I really like the suspension add on. It keeps my truck level when towing our 9000 lb camper bumper pull. I get great stability on the road and it helps with handling the tongue weight on my 2013 Toyota Tundra 1/2 ton. It doesn't change the stiffen the suspension of my truck until I add weight. So, you don't notice it with normal driving. Installation went smoothly. The components were high quality and heavy duty. I recommend it.



by:
2015 Toyota Tundra

Mounted on 2015 Tundra ,pull heavy car trailer and toy box these work great and are adjustable. Unlike airbags they won't leak and much easier install. They helped level truck when I'm loaded and resolved some front braking issues with the sensors on these new vehicled.



by:

Overall, I'm super pleased with both the product and services from etrailer and the suspension enhancement seems to work well for my application. Small camping trailer, helped take away most of the sag.



by:
Toyota Tundra

When I began the installation I set up the Tundra on my slopping driveway with chocks and attempted to jack it up with my small floor jack. Once I saw that I had to remove the spring eye plate I decided it was not very safe. I ended up going to my son-in-laws where he had a floor lift. After lifting the truck it was a very easy installation. I did watch U-tube about 6 or 8 times to make sure of the adjustments and as I said it went very well. Here are a couple of photos.



by:

We added these to my 2017 Tundra which we use to pull a gooseneck horse trailer. We camp on USFS lands and roads can be bumpy, rutted, etc. this stiffens up the suspension and we’ve never had any issues with bottoming out.



by:
2019 Toyota Tundra

I bought this kit for my 2019 trd pro it’s an absolute must for the saggy leaf springs in the tundra especially the fox shocks but these give it a way better stance on the back with a 3” lift kit. you can tell this difference as soon as you drive the truck ABSOLUTELY FANTASTIC!!!!



by:
2018 Toyota Tundra

Shipped fast and the box had easy instructions. Definitely a DIY-capable project, and worth the purchase! -2018 Tundra 4x4



by:

So easy to purchase w - Jessica/ Parts came across US just in time.
2nd X buying these, so will see HOW they fit in a couple of weeks.
THX & God bless..PRAYING for safety of all concerned with virus.



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by:
2015 Toyota Tundra



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2020 Toyota Tundra



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by:

I am a competitive shooter and take my camper to all my shoots. I have a cap on my truck and the decked drawer system. I also carry 400 lbs of ammo at any given time. When pulling my camper on the highway or over bumps and railroad tracks it was kinda scary. This system stopped the squat and removed the sag at acceleration. I installed sumo springs as well (without spacer) for added sway control when loaded down with trailer. The RAS was great right from the start. It reminded me of the 80’s then we would put traction bars on old hot rods to stop rear squat on acceleration. Same kind of feel with my truck. Some much nicer. With the trailer it removed 1.5 inches of squat on the rear and got my front and back within 1” of variance and before install it was around 2.5 to 3. Took only fifteen minutes per side to install once the tires were off. Great product….



by:

Received these ahead of schedule and all intact. I watched the video on etrailer.com and youtube, very helpful.
The installation is not difficult if you are handy with tools. Aside from it deciding to rain on me during install it was not bad. Suggest you lay out all your tools and include a couple of adjustable wrenches. First off, unscrew that gold screw alot, when you think there is enough, go more, the first side I was short. I wiped down the truck springs to remove any dirt there and set up then tightened by hand, you can't go far that way but gets you started. On the rod with the 2 nuts that will lock together when done, I gave myself about 3" of thread and locked them together to hold the threaded rod while adjusting, no way to hold the end nut, this worked out well. The one thing I would have done different is the adjusting nut is 14mm, I only have a 6" ratcheting 14mm, doable but at the end it tough, I wish I had a 10" or so, there was space in my install. I set mine to high since I pull a 5th wheel so adjusting was the hard part.
I will not know until spring if this helps with the towing as the camper is now stored but very hopeful from others input. If anything changes I will update.



by:

I bought these after a 1000+ mile trip towing my trailer (~8000# loaded) with my 2013 F-150 (HD Payload & Max Towing Package). Installation was super easy. I did not need to take the tires off. There was plenty of room to get behind the tires and place and adjust the springs. Once installed they definitely give the truck a rake. I didn't measure pre-installation because I didn't expect the lift to be so great. I used the black disc to adjust the springs.
It's not too extreme but you can definitely see a difference compared to stock.
As you can see in the pictures, with the springs the drop with a trailer attached is greatly reduced and the truck sits level. Towing was great. I used a WDH before and being able to with springs only and a sway bar is pretty nice. Drop with trailer attached is only about 2.5 inches (see pics)



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.



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:

Sure beats air bags or blocks! My Gmc canyon diesel is a great puller, needed help with suspension hauling load limit. Easy to install and works great. On high setting it raised the truck rear an inch or two even empty but the way gmc set up the suspension I consider it a good thing.With my tandem axle 16' trailer loaded it's a saving grace.


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See what our Experts say about this RAS Vehicle Suspension

  • Does RoadActive Suspension kit part # RAS4611TD Fit 2007-2021 Toyota Tundra
    At this time yes the RoadActive Suspension kit part # RAS4611TD does fit all models of the 2007-2021 Toyota Tundra. It might be fit for newer models too going forward but this is as of September 2021.
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  • Recommended Suspension Enhancement System For My 2019 Toyota Tundra With A 6 Inch Lift
    When installing suspension enhancement on your 2019 Toyota Tundra that a 6 inch lift The RoadActive Suspension # RAS4611TD will work for you as long as the leaf springs are stock, if not The Timbren Rear Suspension Enhancement System # TTORTUN4 will work you if you use the Spacer Kit for Timbren Suspension Enhancement System # T68MR. The Timbren System has a 6,000 pound capacity. The hollow rubber springs sit above the rear axle to help stabilize and level your Toyota Tundra. They also...
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  • Does RoadActive Suspension Fit 2018 Toyota Tundra With TRD Anti-Sway Bar
    Thank you for the excellent photo of the TRD anti-sway bar on your 2018 Toyota Tundra. And yes, the RAS kit is absolutely compatible and will fit your '18 Tundra with the anti-sway bar; the correct fit for your truck is the following: - RoadActive Suspension Custom Leaf Spring Enhancement Kit # RAS4611TD I verified this fit with the manufacturer for you, and the # RAS4611TD is going to combine with your anti-sway bar to give your suspension a superior amount of support and control, particularly...
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  • Comparing RAS Leaf Spring Enhancement Kits RAS34FR and RAS4611TD For 2017 Toyota Tundra
    You are correct that there are two RoadActive Suspension Leaf Spring Enhancement Kits for your 2017 Toyota Tundra, the # RAS34FR which has a 3000lb capacity and the # RAS4611TD with a 2000lb capacity. Between these two kits I recommend going with the # RAS34FR as it will give the most support to your suspension. These kits will not negatively affect your unloaded ride so there is not a down side in going with the heavier duty system. With the # RAS34FR you will not only get less squatting,...
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  • Will the SumoSprings for a 2021 Toyota Tundra Work With Lift Kit
    The SumoSprings Solo Custom Helper Springs part # SSR-610-54 which is a fit for a 2021 Toyota Tundra is designed to work with the factory suspension. There are many different types of lift kit options. If the kit consists of a spacer block under the leaf springs then there should be no issue but if it's any other type of lift then the system may not work properly. Another option assuming you have factory leaf springs is the RoadActive Suspension Custom Leaf Spring Enhancement Kit part...
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  • 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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  • Will the RoadActive Suspension Kit Reduce Sag on 2019 Toyota Tundra
    The RoadActive Suspension Custom Leaf Spring Enhancement Kit # RAS4611TD will definitely help lift the rear of your 2019 Toyota Tundra. This kit is specifically designed to help keep your ride level when towing or hauling a heavy load like your commercial topper and tools. The RAS kit will actively strengthen your leaf springs and improve ride quality as well. It also helps extend the life of your leaf springs, shocks, shackles, and tires. The variable-rated coil tension springs will automatically...
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  • Recommended RAS Leaf Spring Enhancement For 2018 Toyota Tundra Towing Small 5th Wheel Trailer
    For your 2018 Toyota Tundra towing a small 5th wheel trailer with 1200lbs of pin weight I recommend the RoadActive Suspension Custom Leaf Spring Enhancement Kit # RAS4611TD as it has a 2000lb load rating which is plenty for the weight of your trailer, and will do a great job of preventing sag and eliminating sway and body roll when your truck is loaded or unloaded. There is nothing wrong with going with the heavy duty # RAS34FR that has a 3000lb load rating, but you do not need that much...
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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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    The best thing you can add to your 2021 Toyota Tundra to improve the stability and ride quality of your truck when you are towing is an active suspension kit, and the correct one is going to depend on the amount of squat you have and/or the tongue weight you have: - Less Than 2 Inches of Squat and/or Less Than 600 lbs of Tongue Weight: RoadActive Suspension Custom Leaf Spring Enhancement Kit # RAS4611TD - More Than 2 Inches of Squat and/or More Than 600 lbs of Tongue Weight: RoadActive...
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  • Best Suspension Enhancement for 2019 Toyota Tundra
    Easily the best way to improve the suspension on your 2019 Toyota Tundra is with the RoadActive Suspension Custom Leaf Spring Enhancement Kit # RAS4611TD because it is an active system which works to continually reinforce your original leaf spring suspension, and like you wanted, it requires zero maintenance whatsoever. The force normally put on your Tundra's current leaf springs - either when carrying cargo or when making a tight turn - gets transferred to the RAS Enhancement Kit, allowing...
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    For your 2021 Chevrolet Silverado 1500 I recommend the RoadActive Suspension # RAS54FR. This is the HD version of the 4611 with a weight capacity of 3,000lbs. The RoadActive Suspension # RAS4611TD that you were looking at is vehicle specific to only fit the 2007-current 2021 Toyota Tundra.
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  • Recommended Suspension Enhancement for 2021 Toyoat Tundra
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  • Best Suspension Enhancement for 2021 Toyota Tundra
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    I understand what you mean by wanting to go above and beyond with your towing setup so that it's as safe as possible but also you don't want to ruin the ride quality of your wife's Tundra so I have what I feel is your best solution. So instead of suspension enhancement your best solution is actually a weight distribution system. A WD system reduces sag like suspension enhancement but since it does so by moving some of the tongue weight of the trailer to the front axle of the tow vehicle...
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  • Will RoadActive Suspension Custom Leaf Spring Enhancement Kit Fit Lifted 2020 Toyota Tundra
    Yes, since you still have the stock leaf springs the RoadActive Suspension Kit # RAS4611TD will fit your 2020 Toyota Tundra. The RAS secures under the leaf spring and around the factory U-bolts and eye bracket. This will help keep you level while reducing sway and body roll. However, no suspension enhancement can increase your load capacity, it only adds additional support. You will be limited by the capacity of your truck.
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  • Recommended Rear Suspension and Parts Needed for Truck Bed Camper on a 2008 Toyota Tundra 8ft Bed
    I can help you outfit your 2008 Toyota Tundra Limited for your camper. To help with the rear sag of the Tundra, I recommend the RoadActive Suspension # RAS4611TD, because of its adjustability and low maintenance. This kit is compatible with 4 wheel and 2 wheel drive models. There are a couple components you will need for your truck camper to mount to your truck properly one of those components will be Frame Mounted Tie-Downs. The TorkLift Custom Frame-Mounted Camper Tie-Downs for your...
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    I checked with Roadmaster Active Suspension and the correct RoadActive Suspension Custom Leaf Spring Enhancement Kit for a 2022 GMC Sierra 1500 is part # RAS4611TD. The RAS works to provide support while towing or hauling, reduces body roll, and requires no modifications for install so it's super easy to remove if need be.
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  • Recommended RoadActive Suspension Kit For 2018 Toyota Tundra With Level Kit
    I do have an option for you but the RoadActive Suspension Custom Leaf Spring Enhancement Kit part # RAS3611 is not a fit for the 2018 Toyota Tundra however the RoadActive suspension systems are compatible with a leveling kit. I recommend to use theRoadActive Suspension Custom Leaf Spring Enhancement Kit part # RAS4611TD which is going to support the leaf springs to level out the ride. This system helps to extend the life of your suspension on the truck especially when towing. I have attached...
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  • Recommended Suspension Enhancement to Reduce Axle Wrap when Towing with 2012 Toyota Tundra
    The only option to assist in your towing experience due to axle wrap or wheel hop is to add the RoadActive Suspension Custom Leaf Spring Enhancement Kit # RAS4611TD. This system will attach to the leaf springs on your vehicle and stabilize the springs when under load. The RAS tension springs disengage when not under load so they will not change your unloaded ride. If you also have side to side sway, then I recommend the Roadmaster Rear Anti-Sway Bar for Trucks # RM-1189-102 which is...
    view full answer...
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Info for this part was:

Employee Jameson C
Expert Research:
Jameson C
Employee Randy B
Installed by:
Randy B
Employee Wilson B
Updated by:
Wilson B
Employee Matthew E
Updated by:
Matthew E
Employee Noah M
Updated by:
Noah M
Employee Daron K
Edited by:
Daron K
Employee Jessie B
Written by:
Jessie B

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