SPL Parts 2015+ Ford Mustang (S550) Front Lower Control Arms

SPL FLCA S550 Front Lower Control Arms for 2015+ Ford Mustang (S550)

The SPL FLCA S550 Front Lower Control Arms provide roll center correction, camber adjustment, and track width adjustment for the 2015 to 2023 Ford Mustang S550, and deliver a complete kit that is 2.0 lbs lighter than the stock Performance Pack arms. Using a combination of 6061-T6 billet aluminum, 4130 Chromoly, 304 stainless steel, and Ti-6Al-4V titanium, the SPL FLCA S550 eliminates the rubber and polyurethane bushing compliance of the OEM arm that allows geometry to shift under braking and cornering. The exclusive Double Adjuster with 360-degree rotating clamps replaces traditional jam nuts for faster, more repeatable alignment adjustments. Stackable 304 stainless steel roll center spacers in 1/8 and 1/4 inch sizes allow precise roll center correction on lowered cars. FK PTFE-lined spherical bearings provide F1-specification self-cleaning and self-lubricating performance rated from -65 to 325 degrees F. The SPL FLCA S550 does not fit the Shelby GT350, GT350R, or GT500. Sold as a pair, made in the USA.

Features and Benefits

• Roll center, camber, and track width adjustment for comprehensive front geometry tuning on the S550 Mustang
• 2.0 lbs lighter than OEM Performance Pack arms with stronger billet aluminum and titanium construction
• 6061-T6 billet aluminum arm and clamps with black anodized finish
• 4130 Chromoly electroless nickel-plated Double Adjuster with gun-drilled weight reduction and 360-degree rotating clamp lock
• FK PTFE-lined Spherical Bearings (F1-specification), self-cleaning, self-lubricating, rated from -65 to 325 degrees F
• Ti-6Al-4V titanium socket-head cap screws and 5/8 in. 4340 Chromoly stud
• 304 stainless steel roll center spacers in 1/8 and 1/4 inch increments
• Includes brackets for OEM light-leveling sensors on applicable trims
• Does not fit Shelby GT350, GT350R, or GT500
• Sold as a pair, made in the USA

Fitment

Specifications

What Is Included

• 2 x SPL FLCA S550 Front Lower Control Arms (one per side)
• 4130 Chromoly Double Adjusters with 360-degree rotating clamps
• Ti-6Al-4V titanium socket-head cap screws
• 304 stainless steel roll center spacers (1/8 in. and 1/4 in.)
• 5/8 in. 4340 Chromoly ball joint stud
• Light-leveling sensor bracket
• Installation instructions

Frequently Asked Questions

What geometry adjustments does the SPL FLCA S550 provide on the Ford Mustang?
The SPL FLCA S550 provides front roll center correction, camber adjustment, and track width adjustment on the 2015-2023 S550 Mustang. The OEM arms limit these corrections to minor eccentric bolt adjustments that frequently cannot return alignment to spec on lowered cars.

Does the SPL FLCA S550 fit the Shelby GT350 or GT500?
No. The SPL FLCA S550 does not fit the Shelby GT350, GT350R, or GT500 due to different front suspension geometry on those models. It is compatible with GT, GT Premium, EcoBoost, EcoBoost Premium, Bullitt, and Mach 1 variants.

How much weight does the SPL FLCA S550 save versus OEM?
The SPL FLCA S550 is approximately 2.0 lbs lighter per pair than the OEM Performance Pack arms, achieved through billet aluminum construction and titanium hardware.

Is the SPL FLCA S550 appropriate for daily street use on a lowered Mustang?
Yes. FK PTFE-lined spherical bearings are rated from -65 to 325 degrees F, self-lubricating, and self-cleaning. The SPL FLCA S550 is a practical alignment correction tool for any lowered S550 Mustang that needs proper front camber without eccentric bolt slippage.

Does installing the SPL FLCA S550 void my Ford Mustang warranty?
Under the Magnuson-Moss Warranty Act, Ford cannot void unrelated warranty coverage simply because an aftermarket part is installed. The dealer must demonstrate that the SPL FLCA S550 directly caused the claimed failure. Unrelated repairs remain covered.

What roll center spacers are included and how do I use them?
The SPL FLCA S550 includes stackable 304 stainless steel roll center spacers in 1/8 inch and 1/4 inch sizes. For stock-height Mustangs, install without spacers above the bearing. For lowered cars, add spacers above the bearing in 1/8 inch increments until roll center is corrected. Do not exceed 1/2 inch total above the bearing.

Does the SPL FLCA S550 include the light-leveling sensor bracket?
Yes. The SPL FLCA S550 includes brackets for OEM headlight leveling sensors on applicable trim levels. The bracket maintains proper headlight adjustment after installation.

Can the SPL FLCA S550 be used for autocross or track days?
Yes. The SPL FLCA S550 is widely used in Mustang autocross, HPDE, and road race applications. The locked rotating clamp design maintains alignment settings under repeated cornering loads. Inspect rod ends and fasteners after each track event.

Installation Overview

1. Raise and support the front of the vehicle; remove front wheels.
2. Disconnect the headlight leveling sensor from the driver-side OEM arm if equipped.
3. Remove the OEM ball joint nut at the knuckle and the subframe mounting bolt.
4. Use a fork tool or pry bar to separate the ball joint; remove the OEM arm.
5. Pre-set the SPL FLCA S550 to match OEM arm length using the Double Adjuster.
6. Determine roll center spacer count based on ride height; install spacers above the bearing only if lowered.
7. Install the arm at the subframe end first, then engage the ball joint stud into the knuckle.
8. Torque the subframe bolt to 74 ft-lb (100 Nm); torque the knuckle nut to 180 ft-lb with thread lubricant applied.
9. Tighten the Double Adjuster clamp screws to 150 in-lb maximum.
10. Sweep the suspension through full travel to confirm no binding or contact.
11. Reinstall wheels, lower the vehicle, and perform a professional four-wheel alignment.
12. Re-check all fastener torques after the first 100 miles and 500 miles.

California Prop 65 Warning: This product can expose you to chemicals including lead and chromium, which are known to the State of California to cause cancer, birth defects, or other reproductive harm. For more information, visit www.P65Warnings.ca.gov.