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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
1973 Pontiac GTO
etrailer Installation
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RAS

RoadActive Suspension Custom Leaf Spring Enhancement Kit

Part Number: RAS4514-SAT
In Stock
$539.00
Vehicle Suspension
Not Confirmed to Fit

1973 Pontiac GTO

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etrailer Installation
We'll connect you with nearby partnered installers who know this exact setup.
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 RAS4514-SAT can be ordered online at etrailer.com or call 1-800-940-8924 for expert service.
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  • Reviews (544)
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RAS Vehicle Suspension - RAS4514-SAT

Highlights

  • Custom Fit for Your Vehicle: Mounts to existing attachment points
  • 2,000-lb Load Support: Keeps your truck level when towing or hauling for safer, smoother control.
  • Instant Stability Boost: Prevents sway, squat, and bottoming out so steering and braking stay steady.
  • Zero Maintenance Required: Once installed, no adjustments or monitoring are needed for dependable use.
  • Protects Suspension Life: Reduces strain on leaf springs, shocks, and tires to extend component life.
  • Easy Bolt-On Install: Mounts under factory leaf springs with no drilling, cutting, or welding needed.
Made in USA

Features to know about

Stay Level Under Load: 2,000-lb Mechanically Active Support

When your truck starts to squat from a heavy trailer or bed load, this system steps in. The RoadActive Suspension kit converts factory leaf springs into a mechanically active setup with a 2,000-lb capacity. The variable-rated coil tension springs automatically adjust to the extra weight to keep your ride level and steady. With the suspension staying in its proper shape, steering and braking stay confident and you don’t have to worry about bottoming out or axle wrap.

Before and after comparison of a truck with and without RoadActive Suspension installed, showing improved rear load leveling and even vehicle stance.

Cut Down on Sway and Body Roll: Reinforced Leaf Spring Stability

Heavy loads and curves can make the back end shift or lean, but this design tightens things up. By strengthening the leaf springs and keeping them from flattening out, the system reduces sway and body roll when turning or hauling weight. That means fewer white-knuckle moments in crosswinds or when a semi passes by. The added control makes towing or hauling feel smoother and safer all around.

Instant Load Response: Variable-Rated Coil Tension Springs

As soon as weight hits the rear suspension, the tension springs activate to support it. The heavier the load, the more assistance they give—no pumps or adjustments needed once it’s set up. When unloaded, the springs disengage so your suspension moves freely and the ride stays comfortable. It’s automatic support that reacts faster than air or hydraulic systems, always ready when you hook up a trailer or fill the bed.

Close-up of RoadActive Suspension coil tension spring attached to a leaf spring assembly, showing how the spring enhances load support and ride stability.

RoadActive Suspension system installed on a rear axle showing stabilized leaf springs that prevent axle wrap and wheel hop under heavy load.

Bolt-On Setup That Lasts: Fully Assembled, Maintenance-Free Design

Installation is simple with no drilling, cutting, or welding required. Each unit bolts under the leaf spring and around the factory U-bolts using the included hardware. Once installed, there’s nothing to maintain or monitor—it just works. The epoxy e-coated steel construction and corrosion-resistant brackets with over 800-hour salt spray rating hold up through years of towing and rough weather without fuss.

Fully installed RoadActive Suspension kit mounted under vehicle’s rear leaf springs, showing bolt-on installation around U-bolts and brackets.

Close-up of RoadActive Suspension unit highlighting epoxy-coated steel coil springs and corrosion-resistant mounting brackets for durability.

Installer adjusting RoadActive Suspension coil tension spring using spacer gauges to set proper preload for custom load support.

Specs

Weight and Capacity

  • Weight capacity: 2,000 lbs

Diagram showing RoadActive Suspension kit installed on a rear axle, labeling major components and their positioning on the vehicle’s leaf spring assembly.

Warranty

  • RoadActive Suspension will not increase your vehicle's weight-carrying capacity
  • 5-Year warranty
  • 30-Day money-back guarantee

4614-SAT RAS Custom Active Suspension System for OEM Leaf Springs - Rear Axle

Replaces RAS 4514-SAT



This Product Fits The Following Vehicles




Customer Satisfaction Score:

Ratings & Reviews

4.7

544 reviews
Review sort icon
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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Ricky profile picture

Ricky

10/31/2022

RAS vehicle suspension is still working great after a rear. I have been pleased with its load carrying ability and no rear sag.



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Shipment was delayed by manufacturer but you guys kept me updated on status



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Works great, although I think it should be a little bit better as far as stiffness with a load on.



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The leaf spring enhancement kit work jast as it was advertised. It eliminated the sag in the back of the truck when my camp trailer was hooked up and made pulling the trailer easier when traveling on rough roads.



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it will be great for my Toyota Tacoma 2 020



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easy install does the job optional adjustment disc was missing but i have installed before and knew what i wanted

Duff profile picture

Duff

3/14/2023

as a repair shop we have installed this on several vehicles. Customers have been satisfied with the out come



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Easy install improved ride, handling and towing



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Very easy install and so far happy with what I'm seeing it do for my Tacoma. Etrailer did a great job of letting me know when it shipped and would arrive. Great service as always.



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Easy to install. The ride is great. I did use the third hole to open up more clearance with the brake line. That worked well.



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Really helped my Tacoma out with all my tools... rides way better,hardly any squat!
Also happy that it straightened out the lean in the rear.



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Seems to work as advertised. I installed it on my 2021 Toyota Tacoma. The installation was simple and quick. It took me longer to get the truck jacked up and the tires removed than it did to install the product. My truck has a little less squat with a load and I don’t notice any stiffer ride when empty. I would definitely recommend.



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Great product. It took me longer to round up my tools than it did to install. The video by etrailer was a great help. As always, great service from etrailer and their staff. They really do care about their customers. Have ordered my Blue Ox Sway Pro, hitch ball and tekonsha brake controller from them. You can't go wrong with etrailer.



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We can tell a big difference with the performance of the vehicle since we installed the roadactive suspension. The ride is smoother, there’s no more bounce when we’re towing our camper.



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Prompt shipping, good price, happy. The Roadmaster was easy to install and works as advertised. Truck used to squat under weight. Now even with the riding mower in the back, I cant even tell its there. No squat and good handling. Unloaded there is no effect on ride. Cranked to max, raised the rear about an inch. Like them.



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My Tacoma came with tow package but manufacturer doesn’t have an electric brake controller. I didn’t like the look of the after market ones until I checked etrailer. They carry The Redarc that tucks the controller under the dash with a nice looking, back lit , dial that fits in the dash with a factory finished look. Install was plug and play. Adding Roadmaster Helper springs really help to stabilize the Tacoma when towing my camp trailer, or when carrying loads in the bed of the truck.
Thanks etrailer.



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2nd one and love it. 1st was for my Tacoma and now for my F150. Get this over sumo springs or airbags as you get a better ride with and without towing. Custom support is awesome at RAS. Tip - adjust the side with gas tank 25% more to balance for a perfectly level ride - that worked for me



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Very happy with the Roadmaster active suspension kit. I had it on other trucks before this one, and was always pleased with how it worked, So never thought twice about using it on next truck. Performs well and does everything it is supposed to do. Much better than cheaper items, it will last and be on truck as long as truck last.



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Had the kit installed today at the local Toyota dealer on a 2019 Tacoma. The truck had a greatly improved ride and seemed to have a more steady rear end feel. I plan on towing an RV in a few weeks and to the mountains in July, and have a greater confidence in performance. It did raise the back a good 2", it doesn't look bad, as I had expected. I firmly believe that this was the right choice, I can't wait to put it to use!



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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.



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Rarely adding an aftermarket "upgrade" to any of my vehicles am I 100% satisfied with the outcome. There is usually a trade off with something. However, this is one of those upgrades that has zero con's that I've discovered so far. I was struggling to keep the leaf springs on my modded out 3rd get Tacoma from "flattening" out because I always have at least 900 lbs of payload in my bed. Adding the RAS has prevented this from happening. I also thought that they would affect off road performance, since I've never seen them in an off road application before, they don't. People on the trail often ask "What the heck?" when they see them on my rig. I tell them that RAS is the easiest to install, most cost effective solution to manage sag without sacrificing ride quality. There is the famously noted "Taco lean" and it's most prominent after fueling up. RAS will help iron this out. I've had them on for about a year now and they haven't needed any adjustments. Kinda like (Ronco), "set and forget it". I don't know their duty cycle is but, I wouldn't hesitate buying them again!



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Greatly supported my leaf spring when towing my double axle trailer. Great product.



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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.



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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.



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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


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See what our Experts say about this RAS Vehicle Suspension

  • Roadactive Suspension Kit that Fits 2024 Toyota Tacoma
    Hey John, I checked with Roadactive (formerly Roadmaster) and they do have a kit that fits your 2024 Toyota Tacoma with the part # RAS4514-SAT but it seems like it doesn't fit the 24 models actually as the truck has coil suspension so instead the Timbren kit part # T67KR would be a great option.
    view full answer...
  • Suspension Enhancements for a 2017 Toyota Tacoma with Firestone Airbags
    I do have a suspension enhancement option for your 2017 Toyota Tacoma that is compatible with the Firestone Ride-Rite Air Helper Springs part # F2407, however, the Timbren Rear Suspension Enhancement System part # TTORTUN4L and the Roadmaster Active Suspension Kit part # RAS4514-SAT will not work. In order to use a set of suspension enhancements with your currently installed Firestone Ride-Rite Air Helper Springs, I recommend the TorkLift StableLoad Rear Suspension Upgrade part # TLA7311...
    view full answer...
  • Best Suspension Enhancement and Weight Distribution for 2022 Toyota Tacoma TRD
    Hey Eric, welcome back ! The best suspension enhancement kit I can recommend for your 2022 Toyota Tacoma TRD would be the Roadactive kit part # RAS4514-SAT. This will give you the additional height from your rear suspension like you are looking for while also has the added benefit of better ride quality loaded and unloaded, and improved handling which will be super helpful since you have a topper that can make the truck feel top heavy. It's really only option that does everything really...
    view full answer...
  • Does Roadactive Suspension Kit for 2022 Toyota Tacoma TRD Create Lift
    Hey Billy, so the Roadactive kit part # RAS4514-SAT that fits your 2022 Toyota Tacoma TRD was not designed to be a lift kit but it is adjustable in the amount of support it can provide so if you cranked it down hard enough you could get additional lift I am sure but I can't say if it would be exactly 2 inches.
    view full answer...
  • What is Best Suspension Enhancement Kit for 2006 Toyota Tacoma RWD
    Hey Billy, thanks for all of the details on your 2006 Toyota Tacoma! The best suspension enhancement kit would then be the part # RAS4514-SAT. This gives you the adjustable support you are looking for that also improves the handling and stability when loaded and unloaded unlike basically all other options available. It's all around the best option.
    view full answer...
  • Will Roadactive Suspension Kit RAS4514-SAT Fit 2023 Toyota Tacoma TRD Off Road
    Hey Jeremy, the Roadactive Suspension kit part # RAS4514-SAT is a fit for your 2023 Toyota Tacoma TRD and would work great for you. This will help reduce suspension sag like you are wanting and will do a great job improving handling and stability with your camper. Your 2023 Toyota Tacoma TRD off road does not have rear coil suspension and does have leaf springs like what this kit is designed to fit.
    view full answer...
  • Suspension Enhancement Recommendation for 2014 Toyota Tacoma
    Hey William, I would recommend the RoadActive Suspension system part # RAS4514-SAT for your 2014 Toyota Tacoma. This is by far the best suspension enhancement kit that provides all the support you are wanting without any real downside. Unlike other options this won't negatively affect your ride quality when unloaded and actually improves it as well as improves handling. What kind of trailer do you have?
    view full answer...
  • Will RoadActive Suspension Enhancement Kit Fit a 2018 Toyota Tacoma
    Sorry to hear about your dissatisfaction with the Timbren # TTORTUN4 on your 2018 Toyota Tacoma. They are hollow rubber springs and can create a bumpy ride when you have a load on the truck and go over speed bumps. As for the RoadActive Suspension Custom Leaf Spring Enhancement Kit # RAS4514-SAT, which is the right kit for your '18 Tacoma 4WD with the axle below the leaf springs, your ride will not be as stiff as with the Timbrens. The RoadActive Suspension is really a full system which...
    view full answer...
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  • Recommended RAS Kit for a 2023 Toyota Tacoma TRD 4WD
    To determine which RAS kit you will need you're going to want to look underneath your Tacoma's rear axle. Some of the 2023 models have the leaf springs mounted below the axle. I have listed options for both below. The systems have identical 2,000 lbs capacities which means they will add an additional 2,000 lbs of support to your rear springs. Axle Below the Leaf Spring - RoadActive Suspension Custom Leaf Spring Enhancement Kit item # RAS4514-SAT Axle Above the Leaf Spring - RoadActive...
    view full answer...
  • Will RoadActive Suspension For 2019 Toyota Tacoma Give Smoother Ride Than Timbrens
    That's a good question, and the answer is pretty straightforward - yes, the RoadActive Suspension (RAS) is going to give you a smoother, less bumpy ride than the Timbrens for your 2019 Toyota Tacoma. Like you mentioned, the Timbrens do their job well due to the stiffness of their rubber springs, but that stiffness can also cause the ride to be uncomfortable or even jarring as there isn't much give to them. The RAS will absolutely remedy that while providing the same - or better - enhancement...
    view full answer...
  • Does The RAS Suspension System Affect Ride Quality Of A Tacoma When Not Towing
    The RAS Suspension Systems essentially preload your leaf springs making them stiffer to prevent sag. This will affect your unloaded ride quality but not as negatively as some other compatible suspension enhancements for your Tacoma. These systems are super easy to adjust tension on so you could always lower the tension when unloaded if you weren't happy with the ride quality and then add more tension when it's time to haul. If you have a 2WD Tacoma then you'll want the RoadActive Suspension...
    view full answer...
  • Do You Carry The Roadmaster Active Suspension Kit 4614-SAT for a 2019 Toyota Tacoma?
    The RoadActive Suspension Custom Leaf Spring Enhancement Kit # RAS4514-SAT is the current part number 4614-SAT for your 2019 Toyota Tacoma 4wd. As the 4614-SAT was a rolling change replacement for the 4514-SAT from RAS we kept the parts under our same item number.
    view full answer...
  • How to Correct Vehicle Sag & Trailer Sway in 2014 Toyota Tacoma Prerunner Towing 4K Camping Trailer
    To both correct vehicle rear-end sag and also control or prevent trailer sway the best solution is a properly-rated weight distribution system, one that includes built-in sway prevention. These setups can do both of these things at once, both leveling of the tow vehicle and prevention of sway in the trailer. You can refer to the linked article and video for more information. The way to choose the right one is to know your fully-loaded road-ready trailer's tongue weight (TW), with water...
    view full answer...
  • Can RoadActive Suspension Install on Lifted Toyota Tacoma
    Yep, you can install the RoadActive Suspension Custom Leaf Spring Enhancement Kit # RAS4514-SAT on your lifted Toyota Tacoma. There will not be any issue with the fit, and you made a really nice choice with the # RAS4514-SAT. These will help negate sag, improve your Tacoma's handling, and also requires no maintenance whatsoever, which is really nice.
    view full answer...
  • Will The RoadActive Suspension Custom Leaf Spring Enhancement Kit Interfere With Brake Lines
    The RoadActive Suspension Custom Leaf Spring Enhancement Kit # RAS4514-SAT sits on top of the leaf springs and would not interfere with your brake lines.
    view full answer...
  • Solution for Suspension Enhancement on 2011 Toyota Tacoma X-Runner With Lowering Blocks
    In general, the Firestone # F2407 and other air bags are designed to fit vehicles at factory ride height. If you have a lift you can add spacers but when the vehicle is lowered like your 2011 Tacoma X-Runner they aren't going to work. Instead, I recommend using the RoadActive Suspension Custom Leaf Spring Enhancement Kit. The RAS system installs on your leaf springs so the lowered design of the X-Runner won't be a problem. These have a 2,000 lb capacity and turn your leaf springs into...
    view full answer...
  • Best Suspension Enhancement for 2016 Toyota Tacoma TRD Sport to Improve Handling and Stability
    The suspension enhancement we offer for your 2016 Toyota Tacoma TRD 4WD that will do the best job at reducing sway, body roll, and improve handling would be the RAS system part # RAS4524-SAT for if you axle is located above the leaf spring or part # RAS4514-SAT if yours is located below it. With just this alone you'll see a dramatic improvement in all of the things mentioned. We would not recommend running this with any other suspension enhancement.
    view full answer...
  • Suspension Enhancement Recommendation for 2018 Toyota Tacoma with Truck Bed Camper
    The best suspension enhancement kit we offer for your 2018 Toyota Tacoma is the RoadActive Suspension kit part # RAS4514-SAT as it gives the support you are wanting, improves the ride quality and handling whereas other kits that give similar support like what you mentioned make the ride quality harsher.
    view full answer...
  • Would RoadActive System part # RAS4514-SAT Fit 2017 Toyota Tacoma with 2 inch Lift
    Suspension enhancement like the RoadActive System part # RAS4514-SAT are not designed to improve unloaded ride quality in a vehicle. At best they leave the ride quality the exact same when unloaded but give more support to the suspension when loaded. This kit can be used on a lifted truck too. To improve overall ride quality you would need to look into a different set of shocks for the truck.
    view full answer...
  • What Is the Difference Between RoadActive Suspension Kits for 2016 Toyota Tacoma 4WD?
    The difference between the RoadActive Suspension Kit # RAS4514-SAT and the # RAS4524-SAT is more than price. The # RAS4514-SAT is intended for vehicles in which the axle is located below the leaf springs and the # RAS4524-SAT is intended for vehicles in which the axle is located above the leaf springs. They look almost identical uninstalled, but the installation and function is different.
    view full answer...
  • RoadActive Suspension Kit for a 2019 Toyota Tacoma 4 Door Long Bed 4WD
    Yes, it does make a difference and you will need to take a look at your leaf springs before you make your order to see which kit you will need. Both RoadActive Suspension kits item # RAS4514-SAT and item # RAS4524-SAT fit a 2019 Toyota Tacoma 4-Door Long Bed 4WD pickup but you have to look at your rear suspension first to determine if your leaf springs are above or below the axle. If your leaf springs are below the axle you will need the item # RAS4514-SAT and if they are above the axle...
    view full answer...
  • Is There a RoadActive Suspension Kit that Fits 2022 Toyota Tacoma
    We do have a RoadActive Suspension kit that fits your 2022 Toyota Tacoma with the part # RAS4524-SAT for if you axle is located above the leaf spring pack or the # RAS4514-SAT for if your axle is located below the spring pack.
    view full answer...
  • RoadActive Suspension Custom Leaf Spring Enhancement Kit
    Yes it is possible to install both the RoadActive Active Suspension Kit # RAS4514-SAT with the Firestone Ride Rite kit you have installed on your 2016 Toyota Tacoma. The two kits would not interfere at all.
    view full answer...
  • Which RAS Suspension Kit Fits 2020 Toyota Tacoma
    Both RAS kits part # RAS4514-SAT and # RAS4524-SAT fit the 2020 Toyota Tacoma but you have to run out and look at your rear suspension first to determine if your leaf springs are above or below the axle. If they are below you need the # RAS4514-SAT and if they are above you need # RAS4524-SAT.
    view full answer...


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Info for this part was:

Employee Jeff D
Installed by:
Jeff D
Employee Jameson C
Expert Research:
Jameson C
Employee Adam R
Expert Research:
Adam R
Employee Jeffrey L
Expert Research:
Jeffrey L
Employee Mary K
Written by:
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Employee Wilson B
Updated by:
Wilson B
Employee Noah M
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Employee Carrie F
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