McLeod Racing RST HD Twin Disc Clutch Kit w/ Aluminum Flywheel – 2018–2023 Ford Mustang GT 5.0L Coyote (S550) | 8-Bolt Crank | 164T | 950HP Rated

The McLeod RST HD Twin Disc Clutch Kit is engineered for 2018–2023 Ford Mustang GT owners who need significantly more holding power than stock while retaining the street manners required for daily driving. Rated to 950 horsepower, the RST HD sits between McLeod’s RST and RXT twin-disc systems — delivering an ideal balance of torque capacity and drivability for high-horsepower Gen 3 Coyote builds that see both street use and weekend track or strip duty. This kit includes an aluminum flywheel (164-tooth) for a complete, ready-to-install package.

8-Bolt Crank – Critical Fitment Note for 2018+ Mustang GT

The 2018+ Mustang GT uses the Gen 3 5.0L Coyote with an 8-bolt crankshaft flange — a significant change from the 6-bolt crank used on the 2011–2017 Gen 1/Gen 2 Coyote. Flywheel and clutch kits are not interchangeable between 6-bolt and 8-bolt crank applications. This kit (MLR6333825MD) is engineered specifically for the 8-bolt crank of the 2018–2023 Mustang GT. Verify your crank bolt pattern before ordering — do not attempt to fit a 6-bolt flywheel to an 8-bolt crank or vice versa.

Aluminum vs. Steel Flywheel – Which Is Right for Your Build?

McLeod offers the RST HD in both aluminum and steel flywheel configurations. The flywheel material affects rotational inertia, rev response, and heat management:

• Aluminum Flywheel (this kit): Significantly lighter than steel — reduced rotational inertia means faster throttle response, quicker rev-matching, and a more responsive, free-revving engine character. The preferred choice for track-focused builds, road racing, and high-RPM performance driving where rev response and throttle feel are priorities. Less thermal mass than steel — not ideal for repeated high-load launches (drag strip) where heat absorption is critical
• Steel Flywheel (MLR6435825MD – 2011–2017 application): Greater thermal mass provides better heat absorption for repeated hard launches and strip use. Heavier rotational inertia smooths out low-RPM power delivery. Better suited for drag strip and street/strip use where launch consistency and heat management are priorities over rev response

Hybrid Friction System – Organic + Ceramic

The RST HD uses a dual-disc hybrid friction design that combines two different friction materials to balance engagement feel with holding power:

• Full-Face Organic Friction (one disc): Smooth, progressive engagement and excellent durability under repeated street and strip use — responsible for the RST HD’s street-friendly engagement feel and pedal modulation
• Segmented Ceramic Friction (opposing disc): Increased bite and enhanced holding power when performance demands rise — responsible for the RST HD’s elevated torque capacity over a single-disc or full-organic twin-disc setup

Key Features

• 950HP Rated – High-Horsepower Gen 3 Coyote Applications: Rated to 950 horsepower — suitable for supercharged, turbocharged, and naturally aspirated Gen 3 Coyote builds running well beyond stock power levels
• Aluminum Flywheel Included – 164-Tooth, 8-Bolt: Complete kit includes a lightweight aluminum flywheel with 164-tooth ring gear, engineered for the 8-bolt crankshaft flange of the 2018–2023 Mustang GT. 164T ring gear is compatible with the factory starter — verify if running a non-stock starter
• Twin Disc Design – Increased Torque Capacity Over Single Disc: Twin-disc design doubles the friction surface area compared to a single-disc clutch — allowing significantly higher torque capacity without the extreme clamp loads that make single-disc high-capacity clutches difficult to drive on the street
• Street-Friendly Engagement: Despite its 950HP rating, the RST HD is designed to retain acceptable street manners — progressive engagement, manageable pedal effort, and drivability in traffic
• McLeod Racing Quality: Manufactured by McLeod Racing — a respected American clutch and drivetrain specialist with decades of experience in performance and racing clutch systems for domestic V8 applications

Specifications

• Type: Twin Disc
• Friction: Hybrid — Full-Face Organic + Segmented Ceramic
• HP Rating: 950HP
• Flywheel: Aluminum, 164-Tooth, 8-Bolt Crank (Included)
• Fitment: 2018–2023 Ford Mustang GT 5.0L Coyote Gen 3 (S550, 8-Bolt Crank)
• Part Number: MLR6333825MD
• UPC: 887753894137

⚠️ Installation Notes: Verify 8-bolt crank fitment before ordering — this kit is not compatible with the 6-bolt crank of 2011–2017 Mustang GT. Professional installation by an experienced drivetrain specialist is strongly recommended. Clutch break-in procedure required after installation — avoid aggressive launches or full-throttle acceleration for the first 500 miles. Transmission fluid and rear main seal inspection recommended during installation. McLeod Racing’s installation instructions must be followed — improper installation voids warranty.