Steeda Mustang 'Stop the Hop' Street Enthusiast Kit (2015-2022)

2 Review(s)
$33.00 (5%)
Are you looking to cure your wheel hop but want a bit more than our 'Stop the Hop' Starter Kit, though you don't want to go full blown with the 'Stop the Hop' Ultimate setup? Your wait is over.

Part Number: 555 4456

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Are you looking to cure your wheel hop but want a bit more than our 'Stop the Hop' Starter Kit, though you don't want to go full blown with the 'Stop the Hop' Ultimate setup? Your wait is over. This is our 'Stop the Hop' Enthusiast Kit, giving you our new Spherical Rear Lower Control Arm Bearing in addition to our 'Stop the Hop' Starter kit, to improve your 60ft times even more.

Which "Stop the Hop" Kit is for you?

Eliminate Wheel Hop without sacrificing ride comfort or breaking the bank. Our Performance Experts got together and came up with the best four components for eliminating unwanted wheel hop in the S550 Mustang. A kit that gives you the fundamental foundation for ultimate traction and suspension compliance.

First is our Alignment dowel kit. This fills the factory bolt hole voids with CNC machined Delrin inserts that will square up the rear subframe to the chassis. By filling these voids we are also limiting the side to side and front to back movement of the subframe that is present under hard acceleration and braking.

Second is our tried and true IRS Subframe Bushing Support System. This 8 piece kit was a first of it's kind in the performance aftermarket and so innovative and popular we patented it's design! Made in house from billet 6061 aluminum and featuring stainless steel hardware, this kit fills all the factory voids in the IRS subframe mounting locations. It's job is to prevent up and down movements of the subframe.

Third to this kit is the strongest support brace for the S550 IRS on the market! Made in house from chromoly steel, this brace is designed to support the factory subframe by directly tying it into the chassis at key mounting locations. Using factory mounting locations on the factory frame, this 5-point brace supports the front factory mount and the lower control arm mount as well. A simple bolt in design this brace ties the subframe to the chassis in the best possible way.

Fourth are our Rear Lower Control Arm Spherical Bearings. These eliminate the factory deflection that can cause up to 2 degrees of inward toe upon acceleration, and improve chassis responsiveness. If you drag race your GT, EcoBoost or V6 Mustang, our spherical bearings for the rear lower control arm will assist tires hooking immediately upon acceleration.

These four parts were the first of their kind for the S550 Mustang and nothing will prevent unwanted subframe movement or wheel hop better than this kit for the price.

Add the Steeda Adjustable Differential Bushing Insert Urethane System ( GT or EcoBoost ) to further improve rear end control under launches by minimizing pinion angle changes, reducing differential deflection, and increasing traction.

Kit Includes:
  • 555-5754 - Steeda IRS Subframe Support Braces
  • 555-4437 - Steeda IRS Subframe Bushing Support System
  • 555-4438 - Steeda IRS Subframe Alignment Kit
  • 555-4117 - Steeda S550 Mustang Rear Lower Control Arm Spherical Bearings

NOTE: Steeda IRS Subframe Support Braces Will Not Fit Convertible

Product Install Instructions:
Sub Frame Brace
IRS Sub Frame Bushing
Rear Sub Frame Alignment Kit
Lower Control Arm Spherical Bearing

Product Benefits:
  • Eliminate wheel hop while not increasing NVH
  • Eliminate subframe movement
  • Squares subframe to the chassis
  • No permanent modifications
  • Eliminates alignment change under power

Steeda S550 Stop The Hop InfographicFind out which Stop The Hop Kit is best for you!

CA Residents: Cancer and Reproductive Harm WARNING

Hey guys this is John from Steeda. I want to get you guys a little more info today on our "stop the hop kit" we've got three available now including our new stop the hop enthusiast package. Let me go from one division we're gonna start with our stop the hop starter kit. Now this kit includes our steel subframe braces, which are these right here. They help eliminate lateral movement in the subframe itself and they leave it to the chassis more effectively. We've also got our Steeda subframe alignment Kit. Now these dowels right here they fill the voids between the stock bolts and subframe a little bit different size they can have up to a quarter inch of movement in most cases in any direction. This helps keep the rear end center every time under the car. And to close out the starter kit we've got the subframe bushing support system. but what these do is they fill the voids in the stock bushings and that helps to control the deflection and the oscillation of the bushings under a hard launch. It gives more consistency in less wheel hop. Now if you want to turn the starter kit into an enthusiast kit, move in and move towards our Steeda lower control arm spherical bushings. We found it up two degrees of movement is found in the bushing under a hard launch and this doesn't allow it. So it's going to lead again to more consistent launches and less wheel hop. And we found our Steeda "stop the hop ultimate kit" what this is, is it builds on the starter kit and includes our newest Steeda toe links and these help control the toe on the car they're a lot stronger than a factory piece, they don't have as much movement or flex to them. And we got our CNC machined Steeda vertical links. These are one piece CNC designed very large bushings. We offer it with urethane or delrin, Depending on how stiff you want them. And what that means is it helps to stop binding which we found in a stock, which is what Ford calls it, and not binding actually creates an artificial spring rate which changes as the increased movement on the rear axles and that leads to a lot of wheel hop issues inconsistency. These are going to eliminate that problem and if you want to add it the spherical bushings to this kit we've got a drop-down our website. Just let our experts know. You can also add our Steeda differential bushing insert system to any of these kits and you really get the ultimate control of the rear end on your drag car. Now if you've got any questions about your project, need some tech advice, we go by the motto of speed matters. It matters to us, it matters to you. We want to help you guys get on the track have fun, turn some great results. It's what we've been doing for 30 years. Give our performance experts a call. We'll be more than happy to help you out. Thanks for watching. I'll see you guys soon.
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Fitment & Features


Manufacturer: Steeda Autosports
Made in USA: Yes

Vehicle Fitment:

Fits Model Year: 2015, 2016, 2017, 2018, 2019, 2020, 2021, 2022

Customer Reviews

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Average Customer Ratings


If you don't like the back end of your Mustang breaking loose when accelerating out of a turn hard look no further, this is what you want. I already had vertical links with spherical ends installed then added this kit along with the Ford spherical rear spindle bushings. The difference in vehicle control is night and day. The Mustang is more than a little nervous going around corners hard under acceleration to the point of nearly avoiding that kind of driving altogether because with the wrong tires it's not hard to lose control and I have a 2015 Performance Pack GT. After installing this kit and the spherical rear spindle bushings I have to wonder where the limit is for the rear end. I did not even get the rear lower control arm bushing in yet (I was also doing exhaust and a shifter bracket and ran out of time) and the car is leagues ahead of the factory set-up. I have Falken Ziex all season radials on the car which offer surprisingly good grip and feel and with the suspension changes I can leave Camaro drivers wetting their pants in the turns. There was no noticeable increase in NVH.
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