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The SPL RTA S550 Rear Toe Links replace the factory rubber-bushed rear toe links on 2015 to 2023 Ford Mustang with high-precision aluminum and titanium hardware built for performance street driving and track use. The OEM rear suspension on the Mustang IRS platform uses rubber bushings that deflect under hard cornering and braking, causing toe to shift unpredictably mid-corner. The SPL RTA S550 eliminates that compliance by pairing gun-drilled 2024 aluminum links with 6061-T6 aluminum rotating clamps and 3-piece PTFE-lined FK rod ends manufactured in Connecticut. Setting toe is a single-person operation: the rotating clamp requires only a 3/16-inch Allen key, eliminating the two-wrench juggling act associated with traditional threaded adjuster jam nuts. Compatible across all S550 trim levels from the base EcoBoost to the Shelby GT500.
| Year | Make | Model | Trim |
|---|---|---|---|
| 2019 | Ford | Mustang | Bullitt |
| 2020 | Ford | Mustang | Bullitt |
| 2015 | Ford | Mustang | EcoBoost |
| 2016 | Ford | Mustang | EcoBoost |
| 2017 | Ford | Mustang | EcoBoost |
| 2018 | Ford | Mustang | EcoBoost |
| 2019 | Ford | Mustang | EcoBoost |
| 2020 | Ford | Mustang | EcoBoost |
| 2021 | Ford | Mustang | EcoBoost |
| 2022 | Ford | Mustang | EcoBoost |
| 2023 | Ford | Mustang | EcoBoost |
| 2015 | Ford | Mustang | EcoBoost Premium |
| 2016 | Ford | Mustang | EcoBoost Premium |
| 2017 | Ford | Mustang | EcoBoost Premium |
| 2018 | Ford | Mustang | EcoBoost Premium |
| 2019 | Ford | Mustang | EcoBoost Premium |
| 2020 | Ford | Mustang | EcoBoost Premium |
| 2021 | Ford | Mustang | EcoBoost Premium |
| 2022 | Ford | Mustang | EcoBoost Premium |
| 2023 | Ford | Mustang | EcoBoost Premium |
| 2015 | Ford | Mustang | GT |
| 2016 | Ford | Mustang | GT |
| 2017 | Ford | Mustang | GT |
| 2018 | Ford | Mustang | GT |
| 2019 | Ford | Mustang | GT |
| 2020 | Ford | Mustang | GT |
| 2021 | Ford | Mustang | GT |
| 2022 | Ford | Mustang | GT |
| 2023 | Ford | Mustang | GT |
| 2015 | Ford | Mustang | GT 50 Years Limited Edition |
| 2015 | Ford | Mustang | GT Premium |
| 2016 | Ford | Mustang | GT Premium |
| 2017 | Ford | Mustang | GT Premium |
| 2018 | Ford | Mustang | GT Premium |
| 2019 | Ford | Mustang | GT Premium |
| 2020 | Ford | Mustang | GT Premium |
| 2021 | Ford | Mustang | GT Premium |
| 2022 | Ford | Mustang | GT Premium |
| 2023 | Ford | Mustang | GT Premium |
| 2021 | Ford | Mustang | Mach 1 |
| 2022 | Ford | Mustang | Mach 1 |
| 2023 | Ford | Mustang | Mach 1 |
| 2015 | Ford | Mustang | Shelby GT350 |
| 2016 | Ford | Mustang | Shelby GT350 |
| 2017 | Ford | Mustang | Shelby GT350 |
| 2018 | Ford | Mustang | Shelby GT350 |
| 2019 | Ford | Mustang | Shelby GT350 |
| 2020 | Ford | Mustang | Shelby GT350 |
| 2015 | Ford | Mustang | Shelby GT350R |
| 2016 | Ford | Mustang | Shelby GT350R |
| 2017 | Ford | Mustang | Shelby GT350R |
| 2018 | Ford | Mustang | Shelby GT350R |
| 2019 | Ford | Mustang | Shelby GT350R |
| 2020 | Ford | Mustang | Shelby GT350R |
| 2020 | Ford | Mustang | Shelby GT500 |
| 2021 | Ford | Mustang | Shelby GT500 |
| 2022 | Ford | Mustang | Shelby GT500 |
| 2015 | Ford | Mustang | V6 |
| 2016 | Ford | Mustang | V6 |
| 2017 | Ford | Mustang | V6 |
| Specification | Detail |
|---|---|
| Part Number | SPL RTA S550 |
| Material | 2024 Aluminum links; 6061-T6 Aluminum clamps; Ti-6Al-4V Titanium hardware |
| Rod End Type | 3-piece PTFE-lined FK rod ends (made in Connecticut, USA) |
| Operating Temperature | -65 to 325 degrees Fahrenheit |
| Adjustment Method | 360-degree rotating clamp; no jam nuts required |
| Quantity | Pair (2 toe links) |
| Note | Special order item; allow additional lead time |
| Warranty | 1-Year Limited Warranty |
| Country of Origin | Made in the USA |
Does the SPL RTA S550 fit every S550 Mustang trim?
Yes. The SPL RTA S550 fits all S550 Mustang trims from 2015 to 2023, including EcoBoost, EcoBoost Premium, GT, GT Premium, GT 50 Years Limited Edition, Mach 1, Shelby GT350, Shelby GT350R, Shelby GT500, V6, and Bullitt. All share the same rear IRS toe link mounting points.
Why is this listed as a special order item?
The SPL RTA S550 is built to order in low volumes by SPL Parts. Lead time is typically one to two weeks from order placement. Contact us before ordering if your timeline is critical.
How does the rotating clamp adjustment work?
The 6061-T6 aluminum rotating collar slides over the threaded center link. At the alignment rack, loosen the two Ti-6Al-4V clamp bolts with a 3/16-inch Allen key, rotate the center link to the target toe value, and re-tighten. One technician can set toe accurately without a second person holding a jam nut.
What improvement will I notice on track after installing the SPL RTA S550?
The primary gain is consistency. The factory rubber bushings deflect by several degrees under hard lateral loading, causing the rear end to toe out unpredictably under high cornering forces. Replacing them with these links locks the rear alignment setting and makes the car's balance repeatable lap to lap.
What is the temperature range of the FK rod end liner?
The PTFE liner in each FK rod end is rated from -65 to 325 degrees Fahrenheit. This covers the wheel-well thermal environment of any road or track car regardless of climate.
Are these compatible with Mustang Shelby GT350 and GT500 suspension geometry?
Yes. The rear toe link mounting geometry is shared across the S550 platform. These links fit the GT350, GT350R, and GT500 without modification.
Will installing the SPL RTA S550 affect my Ford factory warranty?
Under the Magnuson-Moss Warranty Act, Ford cannot void your entire vehicle warranty solely because you installed an aftermarket suspension component. Ford would need to demonstrate that the specific aftermarket part directly caused the failure being claimed.
What torque spec should I use for the chassis fasteners?
Torque the rear toe link fasteners to OEM Ford specification for your model year. Refer to the Ford workshop manual for your specific year and engine variant. Tighten the SPL rotating clamp bolts with a 3/16-inch Allen key once toe is confirmed at the alignment rack.
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