1-480-966-3040 Mon-Fri 8am to 5pm AZ
Performance & Aftermarket Car Parts - Vivid Racing Performance & Aftermarket Car Parts - Vivid Racing
Live Chat
Hello, Sign in My Account
Sign In
Wishlist
0
My Cart
My Cart $0.00
  See more parts for Ford Mustang
Select the year of your Ford Mustang:
ACT HD/Perf Street Sprung Kit Ford Mustang 1979-1995 - FM4-HDSS

If you're looking to kick your Mustang's performance up a notch, the ACT FM4-HDSS HD/Perf Street Sprung Kit is where it’s at. This kit combines the tried-and-true Heavy Duty pressure plate with a street disc that’s become a favorite among enthusiasts. The pressure plate is designed with a unique diaphragm that cranks up the clamp load, which means it holds on tight without compromising on longevity. Plus, each diaphragm goes through a four-stage heat treatment process, so you know it’s built to handle some serious heat.

The Performance Street disc is no slouch either. It’s made with premium organic materials that have a high copper content—this helps with heat transfer, so you can push your ride without worrying about fade. The steel-backed lining adds an extra layer of durability, and with reduced marcel, you get quicker shifts that feel smooth and responsive. It all comes together for a setup that’s reliable whether you’re hitting the streets or the track.

Installation Tips:

What to Expect:

  • Pedal effort is light to moderate, so it’s comfortable for daily driving.
  • You’ll notice smooth engagement and just a bit of gear rattle—nothing too crazy.
  • Thanks to that clever diaphragm design, you’ll get a longer friction life.
  • Perfect for both street and race applications.
  • Each unit is 100% clamp load tested and dynamically balanced for reliability at high RPMs.

Specs That Matter:

  • Clutch Disc Diameter: 10.5 inches (266 mm)
  • Input Spline Quantity: 26
  • Input Shaft Diameter: 1.125 inches
  • Torque Capacity: 485 ft/lbs—definitely more than enough for spirited driving.
  • Product Weight: 22.2 lbs—light enough to keep things spry.
  • Grease and alignment tool included, but no clutch master cylinder or release bearing.

Fits These Models:

  • Ford Mustang 1979-1998
  • Ford Mustang GT 1986-1995
  • Ford Mustang SVT Cobra 1993-1995

This kit is a solid choice if you want to enhance your Mustang's performance without going overboard. It strikes a good balance between daily drivability and track readiness, so you can enjoy your ride just the way it was meant to be.

Other Part Numbers:
ACT #actFM4-HDSS

Proposition 65

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

Vehicle
1979-1998
 Ford Mustang
1986-1995
 Ford Mustang GT
1993-1995
 Ford Mustang SVT Cobra

ACT Banner

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.

Check out these other great products