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  See more parts for Ford Mustang
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ACT HD/Perf Street Sprung Kit Ford Mustang | Mustang GT | Mustang SVT Cobra 1999-2004 - FM9-HDSS

Upgrade Your Mustang's Clutch with the ACT FM9-HDSS Kit

For Ford Mustang owners looking to enhance their ride's performance, the ACT FM9-HDSS Heavy Duty/Performance Street Sprung Kit is a game-changer. This kit combines ACT's most popular Heavy Duty pressure plate with a high-performance street disc, designed specifically for 1999-2004 Ford Mustang models, including the GT and SVT Cobra. Whether you're hitting the track or cruising the streets, this clutch kit is engineered to deliver exceptional performance and reliability.

Why Choose the ACT FM9-HDSS?

The FM9-HDSS kit features an exclusive diaphragm design that increases clamp load while reducing deflection, which ultimately maximizes clutch life. Each diaphragm undergoes a rigorous four-stage heat-treating process, ensuring it can withstand the demands of spirited driving and track days alike. The precision cover stampings used in ACT pressure plates provide the necessary rigidity and consistency you need for high-performance applications.

Performance-Driven Features

  • Light to moderate pedal effort for a comfortable driving experience.
  • Smooth, positive engagement with minimal gear rattle—perfect for both street and race use.
  • Longer friction life, thanks to ACT’s exclusive diaphragm design.
  • Engineered with premium organic materials that offer excellent heat tolerance and reduced fade.
  • 100% clamp load tested and dynamically balanced for reliable high RPM performance.

Specifications

  • Clutch Disc Diameter: 11 in (280 mm)
  • Input Spline Quantity: 26
  • Input Shaft Diameter: 1.125 in
  • Product Weight: 26.1 lbs
  • Torque Capacity: 605 ft/lbs
  • Pressure Plate Type: Heavy Duty
  • Disc Material: Organic
  • Release Bearing Included: Yes
  • Alignment Tool Included: Yes
  • Grease Included: Yes
  • Pilot Bearing Included: Yes

Installation Instructions

Ready to install? For detailed installation instructions, CLICK HERE.

Customer Feedback

Mustang GT owners have reported significant improvements in their driving experience after installing the FM9-HDSS. One owner noted, “Installed this clutch on my 2001 Mustang GT, and the engagement is so much smoother than stock. I can feel the increased torque handling, especially during hard acceleration!”

Upgrade your Mustang with the ACT FM9-HDSS kit and experience the difference in performance and reliability. This is the clutch kit you need to take your driving to the next level.

Other Part Numbers:
ACT #actFM9-HDSS

Proposition 65

⚠ WARNING: Cancer and Reproductive Harm
https://www.P65Warnings.ca.gov

Vehicle
1999-2004
 Ford Mustang
1999-2004
 Ford Mustang GT
1999, 2001, 2003-2004
 Ford Mustang SVT Cobra

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ACT ? Advanced Clutch Technology | Clutch Kits & Flywheels Built to Handle Real Power

If you've added boost, tuned for more power, or simply want better throttle control, then your stock clutch won't cut it. That?s where ACT (Advanced Clutch Technology) comes in delivering high-performance clutch kits and flywheels designed for real drivers who push their builds on the street, strip, or track.

ACT?s lineup includes everything from daily driver friendly HD kits to hardcore twin disc setups for serious horsepower. Whether you?re launching hard in a WRX, drifting in a 370Z, or canyon carving in an M3, ACT gives you the torque capacity and engagement you need without sacrificing drivability.

Why ACT? Because Power Without Control Is Useless.
  • Hold More Power Engineered to handle turbo, supercharger, and high-compression builds
  • Faster Engagement Stronger pressure plates for better bite off the line
  • Better Pedal Feel Balanced response without going full race-car stiff
  • Reduced Rotational Mass Lightweight flywheels improve rev-matching and response
  • No Guesswork Direct-fit applications, no fabbing, no hassle
ACT Clutch Kits and Flywheels Fit the Cars Enthusiasts Build

ACT doesn?t just make universal performance parts ? they build complete, vehicle-specific clutch solutions for enthusiast favorites. Whether you daily a Civic Type R, track a Subaru STI, drift a 240SX, or drag a Mustang GT, ACT offers the right clutch to match your build goals.

Top supported platforms include the Nissan 350Z/370Z, Toyota Supra A90, Chevy Camaro SS/ZL1, Mitsubishi Evo, Ford Focus RS/ST, and BMW M3/M4 ? each with clutch options tuned to your driving needs.

What ACT Offers:
  • Performance Clutch Kits From HD street kits to twin-disc race systems
  • Clutch Discs 6-puck, full-face, rigid or sprung to match your style
  • Pressure Plates Heavy-duty options that increase clamp load without sacrificing control
  • Chromoly Lightweight Flywheels Quicker revs, smoother shifts, and less drivetrain stress
  • Complete Hardware Kits Everything you need for a proper install
Performance Tested. Driver Approved.

ACT isn?t hype ? it?s proven. Their clutches are SFI-certified, track-tested, and used by racers in drag, time attack, autocross, drift, and rally. But what really matters? They hold power, last longer, and feel right even after hundreds of hard launches or hours of canyon carving.

Whether you're upgrading for more power or replacing a tired OEM clutch, ACT gives you the bite, strength, and feel to drive harder with confidence. No compromises, no excuses just parts that work when it matters.

ACT warrants all products to be free of defects in materials and workmanship for normal use and service for a period of one (1) year from retail purchase. Written notice must be immediately given to ACT within the warranty period. We require a copy of the purchase receipt showing the unit was purchased from an Authorized Dealer or Advanced Clutch Technology directly to verify the product is under warranty. Products purchased used do not carry a warranty. This warranty is to the original purchaser and is non-transferable. All non-warranty items are subject to a $50 inspection bench test fee.

ACT reserves the right to examine any part returned for warranty claim to determine, to ACT's satisfaction, whether the material or workmanship of the part does not conform to this limited warranty. ACT's obligation under this warranty shall be limited to repairing, replacing, or crediting, at its option, any part which is deemed covered by ACT. No labor, lift or storage charges will be reimbursed for any reason. Damage to ACT's parts resulting from misuse, improper use, or abuse shall void this limited warranty. Failure to follow ACT's installation instructions and the vehicle manufacturers installation procedures and specifications shall void this limited warranty.

ACT undertakes no responsibility for the quality of the goods except as otherwise provided in this contract. ACT assumes no responsibility that the goods will be fit for any particular purpose for which you may be buying these goods, except as otherwise provided in the contract. ACT shall not be liable for any damage or injury to persons or property resulting from improper installation or misuse of any part subject to this warranty.

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