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Steeda Ultralite Linear Lowering Springs (15-19 GT, V6 w/o MagneRide)

AmericanMuscle no longer carries the Steeda Ultralite Linear Lowering Springs (15-19 GT, V6 w/o MagneRide). Please check out 2015-2019 Mustang Springs for an updated selection.
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Features, Videos & Details

  • Steeda Ultralite Springs
  • Lowers Center of Gravity for Improved Handling
  • Lowered Muscle Car Stance
  • Linear aka Standard Spring Rate
  • 10% Lighter than Factory Performance Pack Springs
  • Blue Powdercoated Finish
  • Estimated Drop: Front - 1.125”, Rear - 1.0”
  • Made in the USA
  • Not Compatible on MagneRide Equipped Vehicles
  • Fits 2015-2019 GT and V6 Mustangs
  • Clears Stock and Aftermarket Wheels & Tires

Review & Installation Video

Hey, everyone. I'm Justin with, and this is gonna be my detailed overview and install of the Steeda Ultralite Lowering Springs available for your 2015 and newer Mustang. In this overview, I'm gonna do my best to tell you about some of the unique attributes and benefits when installing the Steeda Ultralite Springs. We'll talk a little bit more about the drop you can expect when everything is installed. And last but not the least, we'll actually talk through that installation a little bit as well. And considering the IRS-equipped S-550 is a little bit more difficult than the solid wear axle of previous generation, there is a little bit more work involved. But nevertheless, it's still not that bad, so two out of three wrenches on the difficulty meter with some more detail later on. So the Steeda Ultralite Springs are gonna be one of only a handful of spring options here at AM that will offer you that standard or linear spring rate, making them a great choice for the S-550 owners out there looking to improve their handling by going with that consistent rate, as opposed to going with a varying rate of the progressive spring. Now with that said, it's also gonna be a great choice for owners who're looking for a rather aggressive drop with the Ultralites, looking at an inch in the rear and just over an inch upfront, accentuating that factory rake and making for an awesome stance. Now, Steeda is a Mustang-only company that's been doing their thing for almost 30 years now, and you can say they've been doing it pretty well. They've actually amassed more wins and records than Shelby, Celine, and Rausch combined, so needless to say they know what they're doing in the competitive world. And without a doubt, some of the parts have enabled this performance on the track consistently over the years is their suspension, and more specifically, their springs. Now, just like their competition-based springs, the Ultralites here do feature that linear rate, and what does that mean to you? Well, a linear or standard spring rate is gonna offer one consistent rate no matter how much the spring is compressed. This is a lot different from those progressive rate springs that will offer an initial rate that will be a little bit softer, and then eventually firm up the more the spring is compressed. Now, those progressive springs will, of course, dominate the market. You're gonna see a lot more of them available here on this site, and that's just because they typically offer the best of both worlds. They're gonna be a little better suited for daily driving out there because of that softer initial spring rate, and they'll still perform pretty well thanks to that kind of firmer spring rate you're getting once the spring is actually compressed. However, the problem with those progressive rate springs is the varying rate. So if you're hardcore road racer out there and you have a progressive spring on your car, you might see one rate at corner entry and then a completely different rate at the apex. Now, will this matter for most owners out there? Well, probably not, but if you're serious about competing with your car, you're serious about road racing, then a linear rate is definitely the way to go, because you're gonna be getting a more predictable experience with the spring, and a more consistent performance with the spring itself as well. Another cool thing to point out with the Ultralites, they are a lighter spring overall. At least according to Steeda, they're gonna be about 30% lighter than some of the competition springs, and 10% lighter than the factory performance pack springs. And while this isn't necessarily a big number or a massive chunk of weight, every little bit helps, especially when you're serious about competing with your Mustang. But the reality is, guys, most people aren't concerned with setting lap records here. They're more concerned about just lowering their Mustang from an appearance standpoint. And if that sounds like you, well then obviously these things will still get the job done. It'll still lower your Mustang, while taking advantage of that linear spring rate. In fact, many of our customers do with no complaints. And the Ultralites will deliver a pretty noticeable drop as well. Again, you're looking at exactly one inch in the rear and just over an inch in the front, almost an inch and a quarter. And this is a pretty sizeable drop with the S-550. It's enough to totally eliminate any of that ugly wheel gap, and thanks to the fact that that front spring is offering a little bit bigger of a drop, you're gonna keep that nose down raked, what we like to call, that definitely look sharp on the newer cars. Now, this drop will easily clear the stock wheels and tires, and all of our preconfigured wheel and tire packages for the 2015 and newer Mustangs. So if you're just kind of curious about how big you can go with the wheel and tire, check those out on the product pages. You'll get a better sense of just what kind of sizes you're looking at. Now, I'll always gonna recommend to you, guys, putting a set of lowering springs like these, pairing them up with an aftermarket set of shocks and struts, because it's just gonna be your best bet. And I'm not saying that from a sales standpoint. I'm saying it from an experience standpoint that pairing an aftermarket lowering spring like this with the factory dampers typically doesn't result in the best performance or the best ride quality, and you can even shorten the life of those factory shocks and struts by doing so. Now, considering the S-550 is still a relatively new car, chances are your factory shocks and struts aren't ragged up yet, but it is something to consider moving down the road. And yes, of course, adding those aftermarket shocks and struts will certainly add to your final investment, but you're gonna be in there doing the work when installing these springs. You don't wanna have to do the install twice. Another thing to consider here when adding aftermarket lowering springs is you might wanna consider the use of an aftermarket caster camber plate, or even an alignment bowl. And this is just gonna help you get your car back in spec a little bit easier, especially if you're going with a huge drop, the factory components might not be able to get you back in spec. Shouldn't be a huge concern here with these Steeda springs as they're not really slim in the car, but it is something to consider for you as well. And speaking of investment, the Steeda stuff typically rounds up the higher side of the price range. In fact, you're looking at just south of 300 bucks for the Ultralites. Definitely more affordable than one of your other linear options on this site, the Hurst springs, and right in the same ballpark as some of the BMR linear springs. But let's switch gears and talk about the install here with the Ultralite Springs. And if you've done an installation for springs on a previous generation Mustang, well then you kind of know what to expect. However, the introduction of the IRS would make the rear install a little bit more difficult. Nevertheless, I'm still sticking with my two out of three wrenches on the difficulty meter, maybe four hours to half a day in the shop or garage to get knocked out. As far as tools, well you're looking at some pretty basic stuff here, guys. This includes a number of sockets and wrenches, a spring compressor, of course, for the front, lift jack or jack stands, and I'd also recommend a pull jack to help you with the rear sub-frame, because you are gonna need to back some of those bolts out to make for the removal of the factory spring and the install of the new Steeda spring possible. The front, on the other hand, will definitely be the more time-consuming part of the installation as you do have to remove the strut assembly from the car, remove the factory spring, and install the new Steeda spring using that spring compressor. But overall, anybody should be able to tackle this install with the slightest bit of mechanical expertise. In closing, I'd say the Steeda Ultralite Springs are gonna be for the S-550 owners out there who are serious about improving their handling, using a linear spring, and wanna get a pretty aggressive stance at the same time. So that is my review of the Steeda Ultralite Springs, which you can grab right here at

Improves Handling. Installing a set of Steeda Ultralite Springs on your S550 Mustang enhances the center of gravity, which improves the handling by reducing nose diving under hard braking, squatting at launch, and body roll in the corners. These blue powdercoated Linear Springs provide the ideal balance to deliver impressive looks and steering response, all without sacrificing ride quality.

10% Lighter. If you are looking to lose a few pounds off your S550, Steeda designed their Ultralite Springs to be 10% lighter when compared to the factory Performance Pack springs. These springs are ideal for daily drivers and weekend racers looking to shed unwanted weight in pursuit of quicker times.

Linear Rate. Using a Linear Spring, also known as a Standard Rate Spring, this set of Steeda Ultralite Springs not only enhances the handling performance of your S550 Mustang, but they also improve its overall appearance. By lowering the ride height approximately 1.125" in the front and 1.0" in the rear, it eliminates the ugly "4x4" tire to fender gap, for a more aggressive street stance.

Clears Stock and Aftermarket Wheels & Tires. These lowering springs were engineered to be compatible with your stock size wheels and tires, as well as AmericanMuscle's pre-configured wheel and tire combo kits (specific to your generation), to assure proper clearance with no rubbing issues.

Application. This set of four Steeda Ultralite Lowering Springs are specifically designed for use on the 2015-2019 GT and V6 Mustang, including both Fastback and Convertible models. Does not fit EcoBoost Mustangs.

Technical Note. The Springs are not compatible on vehicles equipped with the MagneRide Suspension.

Note: Coupon codes cannot be applied to this product.

Fitment: 2015 2016 2017 2018 2019 Details

MPN# 555-8211

CA Residents: WARNING: Cancer and Reproductive Harm -

What's in the Box
  • (4) Lowering Springs
Installation Info
Tech Specs
Springs Specifications
Spring Rate: Front: N/A
Rear: N/A
Usage: Street
Year: 2015-2017 GT, V6 Model: Fastback/Coupe & Convertible
Progressive or Standard: Linear/Standard Estimated Drop:

1.125"F / 1.0" R

Will it fit my Mustang?

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Questions & Answers (3)

3 Top Rated Questions

I have a performance pack, I have 255/40/19 on the front and 275/40/19 on the rear, will these clear? I’m a little worried they will run on the front but I have the stock fit so?

  • You should be able to clear the 255s and 275s without any issues. With that being said, we recommend measuring the gap between the tire and fender just to confirm. These springs will drop the front 1.125" and 1" in the rear.

Helpful (0)

I'm going with 295/30R19 fronts and 305/30R19 rears. All rubber will be on 10.5" rims with 25 offset. Am I running a risk of rubbing anywhere with these springs installed on this setup?

  • You should be alright, but we would be advise to measure the gap that you have back there now in order to verify.

Helpful (0)

How much stiffer do these springs make a daily commute?

  • Hello, The Steeda Ultralite Springs - Linear (15-18 GT, V6 w/o MagneRide) will be great for daily driving as they do have a softer initial spring rate.

Helpful (0)
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Customer Reviews (8) Write a Review

Overall Rating 4.9

out of 5 stars

Installation Time:Full Day

Installation Cost:$100-$250

  • Handling Improvement 4.5 4.5
  • Ride Quality 4.875 4.9
  • Appearance 4.875 4.9
  • Bang For Your Buck 4.875 4.9

  • 5/5

    September 06, 2018

    Steeda Ultralite Springs

    Great springs. The drop is exactly what I was looking for. The stance is awesome. Rides and handles like a different car. These springs are a nice addition to your S550.


    Year: 2015 Submodel: GT

    Helpful (2)

  • 5/5

    Installation Time: Shop Install

    Installation Cost: $100-$250

    August 12, 2018

    Steeda Springs

    I had another name brand lowering springs installed and was not happy with the stance and performance. I removed these springs and installed the Steeda Ultralite Springs. These springs provide an excellent stance, are a lot less weight and a high level of quality and performance.


    Year: 2016 Submodel: GT

    Helpful (3)

  • 5/5

    Installation Time: Afternoon

    March 19, 2018

    Great product

    Love the ways these feel and look on the car. Not a crazy drop, but definitelt noticeable. Car handles so much better. Never installed springs before, so it took me an afternoon on jacks, to ensure I was doing everything right. Buttoned them up and went to the dealership just to verify my alignment was good to go.


    Year: 2016 Submodel: GT

    Helpful (4)

  • 5/5

    Installation Time: Afternoon

    January 10, 2018


    These springs are perfect for your S550 mustang. They look great, improve cornering and stiffness, and are still easy to drive around with scraping your front splitter. I would highly recommend these!


    Year: 2016 Submodel: V6

    Helpful (4)

  • 5/5

    Installation Time: Afternoon

    December 27, 2017

    Massive drop!

    Springs were great, overall the drop was much bigger than advertised. These along with Steeda struts, camber arms, and spacers got a nice low stance and just barely tucked 305 20's in the back.


    Year: 2017 Submodel: GT

    Helpful (4)

  • 5/5

    Installation Time: Full Day

    March 23, 2017

    Love these springs!

    I'm really impressed with these springs! Perfect drop all around, less bouncy feeling. Also, I'm able to get out of drive ways no problem. Best buy for my mustang!


    Year: 2017 Submodel: GT

    Helpful (5)

  • 5/5

    October 31, 2016

    Excellent Track Tested Springs

    These springs are not going to win an Emmy for wheel gap "even-ness" but I can personally attest to these springs transforming my car (along with Pro-Action shocks) into a very capable HPDE car. My driving instructor, who drives a very tricked out Porsche (oh, to have money...) was extremely impressed with how my car handled and toward the end of the day asked if I should be advanced a class because I was passing literally everyone so easily in novice (my first HPDE/track day). I ended up doing a session with the next level up and passed in this group, too (except this dedicated exposed cage track car thing). I'm not the best driver there is by far but my suspension is really making me look that way. Keep in mind, the front spring sits kind of goofy in the strut during installation until you put weight on the car. Just get it setup right, install the strut, and don't spend time worrying. I use CC plates with these but I think you can get away without them. I get compliments for the "stance" of the car all the time and looks on the highway. If you want a spring that does more than just LOWER the car but actually has been track tested (by Steeda at Sebring... and me, I guess, at Atlanta Motorsports Park) to actually improve handling, these need to be on your list.


    Year: 2016 Submodel: GT

    Helpful (9)

  • 4/5

    Installation Time: Afternoon

    May 16, 2016

    Don't like the 4×4 look, Steeda Ultralite Springs can help...

    I love the Springs on the car, they made a huge difference in the way it handled. The drop is very mean and aggressive looking. I'm very pleased with the product and the overall look of the car...


    Year: 2015 Submodel: GT

    Helpful (5)

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