FFP · AUTHORIZED DEALER
The leader in Ford performance · Over 35 years · MAP pricing
SHOP ALL STEEDA →
AUTHORIZED DEALER
2015-2026 Ford Mustang – Steeda Adjustable Differential Bushing Insert System - Urethane
- Engineered and manufactured in Valdosta, Georgia
- CNC-machined billet construction where applicable
- Tested on Steeda's SCCA Majors race program
- Steeda authorized dealer — exact MAP pricing
Limited Lifetime Warranty
Backed by Steeda — FFP is an authorized Steeda dealer and warranty claims are honored direct.
Authorized Steeda Autosports dealer. MAP pricing — the same price as steeda.com. Expert install available at our Thousand Oaks, CA shop. Questions on fitment or setup? Chat with Senna or call our specialists.
The full breakdown.
Overview
Steeda Autosports has once again taken the S550/S650 Mustang to the next level of performance and comfort with our exclusive Adjustable Urethane Differential Mount Bushing Insert System for all 2015+ Mustangs! When our engineers sat down to design this kit, we had to come up with a way to increase performance without sacrificing too much drivability and preserving the cars street manners per the driver’s preference.
Unlike our competitors’ kits that take 3-4 hours to install and force you to permanently modify the rear IRS suspension with a Sawzall, Steeda’s does not! Steeda’s kit installs in under 1 hour, is adjustable and can be easily removed – it simply doesn’t get any better than this!
Minimize pinion angle changes, increase traction, eliminate wheel hop and differential deflection with Steeda’s new kit. Made from high-strength urethane to Steeda’s exact specifications and durometers, our kit comes with 2 different bushing options – our red ‘street’ 80 durometer bushings and our black ‘performance’ 90 durometer bushings. Both bushing options will increase performance while the red bushings offer the least increase in NVH as compared to the black. Like all kits on the market, our kit can add noticeable NVH due to increased transfer of gear whine noise problematic to some Super 8.8 IRS differentials.
Product Gallery
Key Benefits
Specifications
Video
📄Download Install Instructions (PDF) — Steeda’s official guide→
Fitment
2015-2026 Ford Mustang GT350/GT500/Mach 1/GT/EcoBoost.
Note: For hardcore enthusiasts that want ZERO pinion deflection, try our 555 4440 kit. This kit features aluminum bushing inserts. For race-use only as it will increase NVH and gear noise.
Steeda has been engineering and manufacturing Ford performance parts in-house in Valdosta, Georgia for over 35 years — proven on their own SCCA Majors race team and trusted by enthusiasts who live and breathe Ford. CNC-machined billet construction, proprietary CAD-driven suspension geometry, and a relentless focus on the platforms they specialize in.
QS-9000 & ISO 9001 manufacturing · Limited lifetime warranty on Steeda-manufactured parts · Made in the USA
FFP fits Steeda parts every week in Thousand Oaks.
— Why we stock Steeda
OE-style engineering, in-house manufacturing, race-proven on Steeda's own SCCA program.
Steeda has been engineering Mustang — and now Explorer, Focus, F-150, and Maverick — parts in Valdosta, Georgia since 1988. CNC-machined billet, proprietary CAD-driven suspension geometry, and a factory SCCA Majors road-racing team that runs their own parts on the track every weekend. When you bolt a Steeda part onto your car, it's the same part Steeda's own race cars run.
We carry Steeda because the fitment is right the first time, the warranty is real (lifetime on Steeda-manufactured parts), and the install instructions don't leave you guessing. Drop the car at our Thousand Oaks shop and our techs handle the fit-up — or order with confidence and run it yourself.
Authority: Charles Siritho · McLaren Artura Trophy owner · Spotter for Branden Sorensen FD Pro (E46 LS+Whipple, 6th at Long Beach R1 2026) · 10+ yrs Mustang & Corvette specialist
Other Steeda parts for your build.
2015-2026 Ford Mustang – Steeda Subframe Alignment and Support Kit
2015-2023 Ford Mustang – Steeda Bumpsteer Kit
![2015-2023 Ford Mustang – Steeda [Open Box] Steeda Rear Adjustable Camber Arms](https://ffperformance.co/wp-content/uploads/2026/05/555-4123-1__92189.1683201112-800x533.jpg)
2015-2023 Ford Mustang – Steeda [Open Box] Steeda Rear Adjustable Camber Arms
2015-2023 Ford Mustang – Steeda Rear Lower Control Arm Spherical Bearings
2015-2023 Ford Mustang – Steeda Front Control Arms (Lateral and Tension Links w/…
2015-2023 Ford Mustang GT/EcoBoost – Steeda Race Differential Bushing Insert System - Aluminum
Shop the full Steeda catalog at FFP.
The leader in Ford performance — suspension, intakes, exhaust, brakes, wheels, and more — for Mustang, Bronco, Bronco Sport, Explorer, F-150, and Maverick. Enthusiast-driven, race-tested. MAP pricing always. Expert installation in Thousand Oaks, CA.
