Steeda 2015-2023 / 2024-2026 Ford Mustang 'Stop The Hop' | FFP
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Steeda 2015-2023 / 2024-2026 Ford Mustang 'Stop The Hop' Ultimate Handling Kit - Brembo

Confirmed Fit: 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.
$1,529.95

or as low as $127.50/mo with Affirm

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SKU: 555-2129-H-7GPP Brand: Steeda
STEEDA AUTOSPORTS
|Performance Engineering Since 1988
PN: 555-2129-H-7GPP
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 Mustang 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.

Steeda's Rear Toe Links are the 4th item in the kit. They help you improve your launch and allows you to control the toe of your Mustang during launches. Improve your 60-foot times and get down track faster with this upgrade from Steeda.

5th in the kit, the Steeda Billet Vertical Links with Urethane Bushings reduce deflection and tighten the rear of your Mustang. This CNC machined 6061 billet aluminum piece is a great step up over the stamped factory piece. Reducing bushing deflection will help you put more power to the ground and improve control, while also preventing unwanted movement and wheel hop. Bushing deflection from the stock rubber bushings can cause sloppy or soft handling and will hold your Ford back from reaching its full potential.

The 6th 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 S550/S650 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: Coupe fitment only. Steeda IRS Subframe Support Braces will not fit convertibles. Will not fit 2024+ Mustang equipped with base brakes.

Find outwhich Stop The Hop Kitis best for you!

Key Features
  • Eliminate wheel hop
  • May increase NVH (gear noise)
  • Eliminate subframe movement
  • Minimizes differential movement
  • Simple install
  • Squares subframe to the chassis
  • No permanent modifications
  • More predictable handling
  • Greater control and stability
  • Fits 2024+ Brembo Pack Mustangs
  • Our 2024+ HPDE build achieved over a 2-second improvement in lap times when combined with our Competition Front and Rear Sway Bar Kit
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
555-4137 — 555-4137
555-4120 — 555-4120
Specifications
Part Number555-2129-H-7GPP
BrandSteeda Autosports
Installation DifficultyModerate
Estimated Install Time~3 Hours
Tools RequiredBasic Shop Tools
Vehicle Fitment
2024-2026 Ford Mustang S650
Trims:GTEcoBoostDark Horse
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.

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