Steeda 2015-2023 / 2024-2026 Ford Mustang 'Stop The Hop' | FFP
YOUR BUILD STARTS HERE Expert Installs Thousand Oaks, CA
805-267-9762 — Tap to Call
Authorized Dealer • Expert Installation • Thousand Oaks, CA
Discount Code: FFPERFORMANCE
805-267-9762
Steeda
Steeda ✓ Authorized
415 products at FFP
View All

Steeda 2015-2023 / 2024-2026 Ford Mustang 'Stop The Hop' Handling Enthusiast Kit

Confirmed Fit: 2015–2026 Ford MUSTANG All
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.
$799.95

or as low as $66.66/mo with Affirm

Available For Purchase

Available

Questions about this part?

Talk to a builder who installs these daily. Free advice, no pressure.

805-267-9762
Free consultation Same-day quotes Expert install
Authorized Dealer
Guaranteed Fit
🔒
Secure Checkout
💬
Expert Support
SKU: 555-4456-H Brand: Steeda
STEEDA AUTOSPORTS

|Performance Engineering Since 1988

PN: 555-4456-H
Product Overview

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 its kind in the per formance
aftermarket and so innovative and popular we patented its 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. Its
job is to prevent up and down movements of the subframe. The 3rd component of this kit is the strongest support brace for the S550 IRS on the market!! Made in house from
chrome-moly 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. The 4th piece is Steeda's Adjustable Differential Bushing Insert System. These polyurethane bushings replace the
soft rubber factory bushings that result in pinion changes, differential movement, and wheel hop. This will improve
handling by helping to keep the rear of your Mustang connected. You can expect some increase in NVH and may
experienceincreased
transfer of gear whine noise problematic to some Super 8.8 IRS differentials.

NOTE: Steeda IRS Subframe support braces will not fit convertible.

Find outwhich Stop The Hop Kitis best for you!

Key Features
  • 555-5754-
    Steeda IRS Subframe Support Braces
  • 555-4443-Steeda Adjustable Differential Bushing Insert System
  • 555-4438-
    Steeda IRS Subframe Alignment Kit
  • 555-4437-
    Steeda IRS Subframe Bushing Support System
  • May increase NVH
  • Eliminate subframe movement
  • Minimizes differential movement
  • Simple install
  • Squares subframe to the chassis
  • No permanent modifications
  • More predictable handling
  • Greater control and stability
What’s Included
555-5754 — Steeda IRS Subframe Support Braces
555-4443 — 555-4443
555-4438 — Steeda IRS Subframe Alignment Kit
555-4437 — Steeda IRS Subframe Bushing Support System
Specifications
Part Number 555-4456-H
Brand Steeda Autosports
Installation Difficulty Moderate
Estimated Install Time ~3 Hours
Tools Required Basic Shop Tools
Vehicle Fitment
2015-2023 Ford Mustang S5502024-2026 Ford Mustang S650
Trims:V6GTEcoBoostBullittMach 1GT500
Video
Professional installation recommended. All Steeda products are backed by Steeda’s manufacturer warranty. For fitment questions, contact our team at FFP — your authorized Steeda dealer.

Reviews

There are no reviews yet

Be the first to review “Steeda 2015-2023 / 2024-2026 Ford Mustang ‘Stop The Hop’ Handling Enthusiast Kit”

Your email address will not be published. Required fields are marked *

Drag photos here or browse

🤖

Not sure if this fits your build? Ask Senna.

Our AI assistant knows every product on the site and can check compatibility, suggest alternatives, and answer technical questions.

💡 Quick Answers

FREQUENTLY ASKED QUESTIONS

📦 What happens after I order? +

You'll get an instant confirmation email with your part details and invoice. We source from a network of authorized suppliers across the country, so lead times vary by brand and part type — we'll send a tracking number the moment your parts move.

Made-to-order builds — carbon fiber bodywork, fabricated systems, custom finish work — run longer than off-the-shelf items because they're built per order. You'll get progress updates throughout the build.

Need a specific timeline on a part before you buy? Call 805-267-9762 or hit the chat — we'll check vendor stock direct and give you a straight answer.

🚚 Do you send tracking with my order? +

Absolutely! Once your order ships, you'll get an email with a tracking link so you can follow its journey from our shop to your doorstep.

If your order ships via freight, you'll get a separate email with a direct link to the carrier's tracking page — easy and stress-free.

🛡 What if my parts get lost or damaged? +

Things happen on the road — even to boxes. If your order arrives damaged, snap a few clear photos of the box and product and send them our way right away.

If your shipment is lost, just email or call us — we'll help track it down and guide you through the next steps to make it right.

What can I do to help FFP? +

Simple — spread the horsepower! Follow us on Instagram, YouTube, and Facebook, and most importantly, drop us a review on Google or Yelp to let others know about your experience.

Your feedback helps us grow, create more content, and keep bringing performance-driven parts to the community. 🏁

🏎
Ready to Order?

1ST CLASS SERVICE

805-267-9762

or email Support@FFPerformance.co

Car parts can be a maze — good thing we brought the map. Our team's here to keep things smooth, simple, and maybe even a little fun.

📞 Click To Call Now

Follow us for builds, tips & giveaways

@FFPerformanceAZ
👤
Customer Support Specialist
Product Guaranteed
🏁
Race Proven Knowledge
🔒
Payments Verified
📞 Call Expert
Popular Searches
Search for parts
Try "C8 exhaust" or "Mustang intake"
Navigate Enter Select Esc Close